ivalentin
/
ObJS


			
				
					
						
						
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							<!DOCTYPE html>
<html>
    <head>
        <title>ObJS</title>
        <link rel='shortcut icon' href='favicon.ico'/>
        <meta content='text/html; charset=utf-8' http-equiv='content-type'/>
        <meta charset='utf-8'/>
        <meta name='viewport' content='width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1'/>
        <link rel='author' href='I&ntilde;igo Valentin'/>
        <link rel='publisher' href='I&ntilde;igo Valentin'/>
        <meta name='description' content='Demo of ObJS - 3D viewer in pure Javascript'/>
        <!-- Script file -->
        <script type="text/javascript">
            /********************************************************************
             * The ObJS object initializes the canvas, assigning it to the HTML *
             * element, and set the required mouse events.                      *
             * #parameters: none                                                *
             * #return: the ObJS object.                                        *
             ********************************************************************/
            function ObJS(){

                /********************************************************************
                 * Parameters for costumization.                                    *
                 ********************************************************************/
                var backColor = "rgba(200, 200, 200, 1)";
                var vertColor = "rgba(10, 10, 10, 1)";
                var edgeColor = "rgba(100, 70, 70, 1)";
                var faceColor = "rgba(180, 180, 255, .6)";
                var faceAlpha = .6;
                var textColor = "rgba(0, 0, 0, 1)";
                var vertSize = 4; //Make it even: at small scales will look better
                var rotationSpeed = 90; //Smaller = faster. 100 is a good speed
                var zoomSpeed = 0.161; //0-1. 0.2 or 0.3 are good speeds
                var moveSpeed = .5;

                /********************************************************************
                 * Variable containing this object, to be refered from nested       *
                 * functions.                                                       *
                 ********************************************************************/
                var thisObJS;

                /********************************************************************
                 * Parameter used to scale the measures in the .obj file. Can be    *
                 * integer or float, greater than 0. 50 is a good default.          *
                 ********************************************************************/
                var scale;

                /********************************************************************
                 * Variable to determine if the canvas has been initialized.        *
                 ********************************************************************/
                var canvasInitialized = false;

                /********************************************************************
                 * Variable to determine if the mouse button is being holded down.  *
                 ********************************************************************/
                var mDown = false;
                var pinch = false;
                var pinchScale = 0;

                /********************************************************************
                 * Variables containing the canvas and its context.                 *
                 ********************************************************************/
                var canvas;
                var topCanvas;
                var frontCanvas;
                var sideCanvas;
                var ctx;
                var topCtx;
                var frontCtx;
                var sideCtx;

                /********************************************************************
                 * Variables containing the number of elements.                     *
                 ********************************************************************/
                var totalVert;
                var totalMaterial = 0;
                var totalFace

                /********************************************************************
                 * Arrays containing the vertices, faces and materials.             *
                 ********************************************************************/
                var material;
                var vert;
                var face;

                /********************************************************************
                 * Booleans to determine wich elements are to draw.                 *
                 ********************************************************************/
                var dVerts = true;
                var dEdges = true;
                var dFaces = true;
                var dBackg = true;

                /********************************************************************
                 * Booleans to indicate if mtl file should be used.                 *
                 ********************************************************************/
                var hasMtl = true;
                var useMtl = true;

                /********************************************************************
                 * Global variables that will contain the position of the mouse in  *
                 * the previous frame to calculate rotation.                        *
                 ********************************************************************/
                var pX = null;
                var pY = null;

                /********************************************************************
                 * Function that initializes the canvas, assignin it to the HTML    *
                 * element, and set the required mouse events.                      *
                 * #parameters:                                                     *
                 *   canv (canvas): canvas to use. If omited, the one named         *
                 *                  named "ObJSView" will be used.                *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.initCanvas = function(canv){
                    if (!canvasInitialized){
                        if (canv != null){
                            canvas = canv;
                        }
                        else{
                            canvas = document.getElementById("ObJSView");
                        }
                        topCanvas = document.getElementById("ObJSTop");
                        frontCanvas = document.getElementById("ObJSFront");
                        sideCanvas = document.getElementById("ObJSSide");
                        ctx = canvas.getContext("2d");
                        topCtx = topCanvas.getContext("2d");
                        frontCtx = frontCanvas.getContext("2d");
                        sideCtx = sideCanvas.getContext("2d");
                        ctx.translate(canvas.width / 2, canvas.height / 2);

                        canvas.onmousedown = function(e){
                            pX = e.offsetX == undefined?e.layerX:e.offsetX;
                            pY = e.offsetY == undefined?e.layerY:e.offsetY;
                            mDown = true;
                        };

                        canvas.onmouseup = function(e){
                            if(mDown){
                                mouseClick(e);
                            }
                            pX = null;
                            pY = null;
                            mDown = false;
                        };

                        canvas.onmousemove = function(e){
                            if(!mDown){
                                return;
                            }
                            var x = e.offsetX == undefined?e.layerX:e.offsetX;
                            var y = e.offsetY == undefined?e.layerY:e.offsetY;
                            if (e.shiftKey){
                                thisObJS.moveHorizontal(x - pX);
                                thisObJS.moveVertical(y - pY);
                            }
                            else{
                                thisObJS.rotateY(x - pX);
                                thisObJS.rotateX(y - pY);
                            }
                            pX = x;
                            pY = y;
                            return false;
                        };

                        canvas.onmouseout = function(e){
                            if(mDown){
                                mDown = false;
                            }
                        }

                        canvas.addEventListener('mousewheel',function(e){
                            e.preventDefault();
                            if (event.wheelDelta > 0){
                                thisObJS.zoom(1);
                            }
                            else{
                                thisObJS.zoom(-1);
                            }
                            return false;
                        }, false);

                        canvas.addEventListener('touchstart',function(e){
                            if(e.touches.length == 2) {
                                pinch = true;
                                pinchScale = Math.sqrt((e.touches[0].clientX-e.touches[1].clientX) * (e.touches[0].clientX-e.touches[1].clientX) + (e.touches[0].clientY-e.touches[1].clientY) * (e.touches[0].clientY-e.touches[1].clientY));
                            }
                            return false;
                        }, false);

                        canvas.addEventListener('touchend',function(e){
                            if(pinch){
                                pinch = false;
                            }
                            return false;
                        }, false);

                        canvas.addEventListener('touchcancel',function(e){
                            if(pinch){
                                pinch = false;
                            }
                            return false;
                        }, false);

                        canvas.addEventListener('touchleave',function(e){
                            if(pinch){
                                pinch = false;
                            }
                            return false;
                        }, false);

                        canvas.addEventListener('touchmove', function(e){
                            e.preventDefault();
                            if(pinch){
                                var dist = Math.sqrt((e.touches[0].clientX-e.touches[1].clientX) * (e.touches[0].clientX-e.touches[1].clientX) + (e.touches[0].clientY-e.touches[1].clientY) * (e.touches[0].clientY-e.touches[1].clientY));
                                if (dist > pinchScale){
                                    thisObJS.zoom(1);
                                }
                                else if (dist < pinchScale){
                                    thisObJS.zoom(-1);
                                }
                                pinchScale = dist;
                            }
                            else{
                                var x = e.touches[0].clientX
                                var y = e.touches[0].clientY;
                                thisObJS.rotateY(x - pX);
                                thisObJS.rotateX(y - pY);
                                pX = x;
                                pY = y;
                            }
                            return false;
                        }, false);

                        canvasInitialized = true;
                    }
                };

                /********************************************************************
                 * Main function, called every time a file is to be loaded.         *
                 * #parameters:                                                     *
                 *   file (string): name of the file, without path or extension.    *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.load = function(file){
                    if(!canvasInitialized){
                        initCanvas();
                    }
                    //Get obj file
                    var xmlhttp = new XMLHttpRequest();
                    xmlhttp.open("GET", file, false);
                    xmlhttp.send();
                    var fileContent = xmlhttp.responseText;
                    //Get mtl file
                    xmlhttp = new XMLHttpRequest();
                    xmlhttp.open("GET",file.substring(0, file.lastIndexOf(".")) + ".mtl", false);
                    xmlhttp.send();
                    var mtlContent = xmlhttp.responseText;
                    initArrays();
                    readFile(fileContent);
                    readMtlFile(mtlContent);
                    draw();
                    drawSides();
                };

                /********************************************************************
                 * Getters that determine if an element is being drawn.             *
                 ********************************************************************/
                this.isBackgroundDrawn = function(){
                    return dBackg;
                };

                this.ivertexDrawn = function(){
                    return dVerts;
                };

                this.isEdgeDrawn = function(){
                    return dEdges;
                };

                this.ifaceDrawn = function(){
                    return dFaces;
                };

                this.isMaterialUsed = function(){
                    return useMtl;
                };

                /********************************************************************
                 * Getters that determine if the model has associated materials.    *
                 ********************************************************************/
                this.hasMaterial = function(){
                    return hasMtl;
                };

                /********************************************************************
                 * Getters for the color of the elements.                           *
                 ********************************************************************/
                this.getBackgroundColor = function (){
                    var str = backColor;
                    var r = str.substring(5, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var g = str.substring(0, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var b = str.substring(0, str.indexOf(', '));
                    var a = 1;
                    return {red: r, green: g, blue: b, alpha: a};
                };

                this.gevertexColor = function (){
                    var str = vertColor;
                    var r = str.substring(5, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var g = str.substring(0, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var b = str.substring(0, str.indexOf(', '));
                    var a = 1;
                    return {red: r, green: g, blue: b, alpha: a};
                };

                this.getEdgeColor = function (){
                    var str = edgeColor;
                    var r = str.substring(5, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var g = str.substring(0, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var b = str.substring(0, str.indexOf(', '));
                    var a = 1;
                    return {red: r, green: g, blue: b, alpha: a};
                };

                this.gefaceColor = function (){
                    var str = faceColor;
                    var r = str.substring(5, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var g = str.substring(0, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var b = str.substring(0, str.indexOf(', '));
                    str = str.substring(str.indexOf(', ') + 2);
                    var a = str.substring(0, str.indexOf(')'));
                    return {red: r, green: g, blue: b, alpha: a};
                };

                /********************************************************************
                 * Functions switching the elements drawn (dVerts, dEdges, dFaces). *
                 * #parameters:                                                     *
                 *   on (boolean): indicating if the element is to be drawn.        *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.drawVertizes = function(on){
                    if (on == true || on == false){
                        dVerts = on;
                        draw();
                    }
                };

                this.drawEdges = function(on){
                    if (on == true || on == false){
                        dEdges = on;
                        draw();
                    }
                };

                this.drawFaces = function(on){
                    if (on == true || on == false){
                        dFaces = on;
                        draw();
                    }
                };

                this.drawBackground = function(on){
                    if (on == true || on == false){
                        dBackg = on;
                        draw();
                    }
                };

                /********************************************************************
                 * Functions switching the color of the elements.                   *
                 * #parameters:                                                     *
                 *   code (string): hex color value, in #fff or #ffffff form. If    *
                 *                  wrong, a message will be printed to console,    *
                 *                  and nothing will be changed.                    *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.severtizesColor = function(code){
                    if (isColor(code)){
                        var color = hexToRgb(code);
                        vertColor = "rgba(" + color.r + ", " + color.g + ", "  + color.b + ", 1)";
                        draw();
                    }
                    else{
                        console.log("severtizesColor(" + code + ") ERROR: " + code + " not a valid hex color");
                    }
                };

                this.setEdgesColor = function(code){
                    if (isColor(code)){
                        var color = hexToRgb(code);
                        edgeColor = "rgba(" + color.r + ", " + color.g + ", "  + color.b + ", 1)";
                        draw();
                    }
                    else{
                        console.log("setEdgesColor(" + code + ") ERROR: " + code + " not a valid hex color");
                    }
                };

                this.sefacesColor = function(code){
                    if (isColor(code)){
                        var color = hexToRgb(code);
                        faceColor = "rgba(" + color.r + ", " + color.g + ", "  + color.b + ", 1)";
                        draw();
                    }
                    else{
                        console.log("sefacesColor(" + code + ") ERROR: " + code + " not a valid hex color");
                    }
                };

                this.setBackgroundColor = function(code){
                    if (isColor(code)){
                        var color = hexToRgb(code);
                        backColor = "rgba(" + color.r + ", " + color.g + ", "  + color.b + ", 1)";
                        draw();
                    }
                    else{
                        console.log("setBackgroundColor(" + code + ") ERROR: " + code + " not a valid hex color");
                    }
                };

                /********************************************************************
                 * Function switching the use of mtl file for color.                *
                 * #parameters:                                                     *
                 *   value (boolean): indicating if the element is to be drawn.     *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.linkMaterial = function(value){
                    useMtl = value;
                    draw();
                }

                /********************************************************************
                 * Function switching the alpha value of the faces.                 *
                 * #parameters:                                                     *
                 *   percent (int): Value (0-100) of alpha. Must be processed (0-1) *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.setAlpha = function(percent){
                    if (percent >= 0 && percent <= 100){
                        faceAlpha = percent / 100;
                        faceColor = faceColor.substring(0, faceColor.lastIndexOf(",") + 2) + faceAlpha + ")";
                        draw();
                    }
                    else{
                        console.log("setAlpha(" + percent + "); ERROR: Only values between 0 and 100 are allowed");
                    }
                };

                /********************************************************************
                 * Function switching the rotation speed.                           *
                 * #parameters:                                                     *
                 *   percent (int): Value (0-10) of speed.                          *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.setRotationSpeed = function(percent){
                    if (percent >= 0 && percent <= 10){
                        rotationSpeed = Math.round((10 - percent) * 30);
                        if (rotationSpeed == 0){
                            rotationSpeed = 1;
                        }
                    }
                    else{
                        console.log("setRotationSpeed(" + percent + "); ERROR: Only values between 0 and 10 are allowed");
                    }
                }

                /********************************************************************
                 * Functions that rotate elements in the canvas along the           *
                 * correspondent axys, calculating the new position for each vertex *
                 * in the vert array.                                               *
                 * #parameters:                                                     *
                 *   des (int): distance to rotate.                                 *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.rotateY = function(des){
                    for (var i = 0; i < vert.length; i ++) {
                        var x = vert[i][0];
                        var z = vert[i][2];
                        vert[i][0] = x * Math.cos(des / rotationSpeed) - z * Math.sin(des / rotationSpeed);
                        vert[i][2] = z * Math.cos(des / rotationSpeed) + x * Math.sin(des / rotationSpeed);
                    }
                    draw();
                };

                this.rotateX = function(des){
                    for (var i = 0; i < vert.length; i ++) {
                        var y = vert[i][1];
                        var z = vert[i][2];
                        vert[i][1] = y * Math.cos(des / rotationSpeed) - z * Math.sin(des / rotationSpeed);
                        vert[i][2] = z * Math.cos(des / rotationSpeed) + y * Math.sin(des / rotationSpeed);
                    }
                    draw();
                };

                /********************************************************************
                 * Function switching the movement speed of the model.              *
                 * #parameters:                                                     *
                 *   percent (int): Value (0-10) of speed.                          *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.setMovementSpeed = function(percent){
                    if (percent >= 0 && percent <= 10){
                        moveSpeed = ((percent * 0.8) / 10) + 0.01;
                    }
                    else{
                        console.log("setMoveSpeed(" + percent + "); ERROR: Only values between 0 and 10 are allowed");
                    }
                }

                /********************************************************************
                 * Functions that move elements in the canvas along the selected    *
                 * direction, calculating the new position for each vertex in the   *
                 * vert array.                                                      *
                 * #parameters:                                                     *
                 *   des (int): distance to move.                                   *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.moveVertical = function(des){
                    for (var i = 0; i < vert.length; i ++){
                        vert[i][1] = (vert[i][1] * 1) + des * (moveSpeed / 50);
                    }
                    draw();
                };

                this.moveHorizontal = function(des){
                    for (var i = 0; i < vert.length; i ++){
                        vert[i][0] = (vert[i][0] * 1) + des * (moveSpeed / 50);
                    }
                    draw();
                };

                /********************************************************************
                 * Function switching the zoom speede of the faces.                 *
                 * #parameters:                                                     *
                 *   percent (int): Value (0-100) of speed.                         *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.setZoomSpeed = function(percent){
                    if (percent >= 0 && percent <= 10){
                        zoomSpeed = ((percent * 0.8) / 10) + 0.01;
                    }
                    else{
                        console.log("setZoomSpeed(" + percent + "); ERROR: Only values between 0 and 10 are allowed");
                    }
                }

                /********************************************************************
                 * Function that changes the scale variable, witch results in a     *
                 * zoom in or zoom out effect.                                      *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: public                                                   *
                 ********************************************************************/
                this.zoom = function(val){
                    scale = scale + val * scale * zoomSpeed;
                    draw();
                };

                /********************************************************************
                 * Function that clears the arrays and the canvas. Use to unload a  *
                 * model.                                                           *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: public                                                  *
                 ********************************************************************/
                this.clear = function(){
                    initArrays();
                    clearCanvas();
                };

                /********************************************************************
                 * Function that turns a hex color code in RGB.                     *
                 * stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb    *
                 * #parameters:                                                     *
                 *   hex (string): color code, for example "#33ff99"                *
                 * #return: (Array) r, g, b, with their correspondent color.        *
                 * #scope: private                                                  *
                 ********************************************************************/
                var hexToRgb = function(hex) {
                    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
                    return result ? {
                        r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16)
                    } : null;
                };

                /********************************************************************
                 * Function that checks if a string is a valid hexadecimal color    *
                 * code, in the format '#ffffff' or '#fff'                          *
                 * #parameters:                                                     *
                 *   code (string): Code to check.                                  *
                 * #return: (Boolean) True if valid color code, false otherwise.    *
                 * #scope: private                                                  *
                 ********************************************************************/
                var isColor = function(code){
                    if (code[0] != '#'){
                        return false;
                    }
                    if (code.length != 4 && code.length != 7){
                        return false
                    }
                    for (var i = 1; i < code.length; i ++){
                        if (code[i] < '0' || (code[i] > 9 && code[i] < 'A') || (code[i] > 'Z' && code[i] < 'a') || code[i] > 'z'){
                            return false;
                        }
                    }
                    return true;
                };

                /********************************************************************
                 * Function that clears the canvas and gets it ready to draw on it. *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var clearCanvas = function(){
                    ctx.clearRect(0, 0, canvas.width, canvas.height);
                    if (dBackg){
                        ctx.fillStyle = backColor;
                    }
                    else{
                        ctx.fillStyle = "#ffffff";
                    }
                    ctx.fillRect(-canvas.width / 2, -canvas.height / 2, canvas.width, canvas.height);
                };

                /********************************************************************
                 * Function initializing the arrays obj, vert and face as empty     *
                 * arrays.                                                          *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var initArrays = function(){
                    material = null;
                    vert = null;
                    face = null;
                    material = new Array();
                    vert = new Array();
                    face = new Array();
                };

                /********************************************************************
                 * Function tat populates the vert[] array with and array of three  *
                 * elements, containig the coordinates, and the face[] array with   *
                 * the vertices forming the face, plus one element indicating the   *
                 * codename of the material.                                        *
                 * #parameters:                                                     *
                 *   text (string): the content of the obj file.                    *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var readFile = function(text){
                    var line;
                    var v = 0;
                    var f = 0;
                    var m = 0;
                    var max = 0;
                    var j;
                    var dist;
                    var fac;
                    var mat = "null";
                    text = text + "\n";
                    while (text.indexOf("\n") != -1){
                        line = text.substring(0, text.indexOf("\n"));
                        if (line.substring(0, 2) == "v "){
                            vert[v] = new Array(3);
                            line = line.substring(2);
                            vert[v][0] = line.substring(0, line.indexOf(" "));
                            line = line.substring(line.indexOf(" ") + 1);
                            vert[v][1] = line.substring(0, line.indexOf(" "));
                            line = line.substring(line.indexOf(" ") + 1);
                            vert[v][2] = line;

                            dist = Math.sqrt(vert[v][0] * vert[v][0] + vert[v][1] * vert[v][1] + vert[v][2] * vert[v][2]);
                            if (dist > max){
                                max = dist;
                            }
                            v = v + 1;
                        }
                        else if (line.substring(0,2) == "f "){
                            line = line.substring(2);
                            face[f] = new Array();
                            j = 0;
                            while(line.indexOf(" ") != -1){
                                face[f][j] = line.substring(0, line.indexOf(" "));
                                if (face[f][j].indexOf('/') != -1){
                                    face[f][j] = face[f][j].substring(0, face[f][j].indexOf('/'));
                                }
                                face[f][j] = face[f][j] - 1;
                                line = line.substring(line.indexOf(" ") + 1);
                                j = j + 1;
                            }
                            face[f][j] = line;
                            if (face[f][j].indexOf('/') != -1){
                                face[f][j] = face[f][j].substring(0, face[f][j].indexOf('/'));
                            }
                            face[f][j] = face[f][j] - 1;
                            face[f][j + 1] = mat;
                            f = f + 1;
                        }
                        else if (line.substring(0, 6) == "usemtl"){
                            mat = line.substring(7);
                        }
                        text = text.substring(text.indexOf("\n") + 1);
                    }
                    scale = calculateScale(max);
                    totalVert = vert.length;
                    totalFace = face.length;
                };

                /********************************************************************
                 * Function tat populates the material[] array with an array        *
                 * containig, four values: the material name, and the three RGB     *
                 * values.                                                          *
                 * #parameters:                                                     *
                 *   text (string): the content of the mtl file.                    *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var readMtlFile = function(text){
                    text = text + "\n";
                    i = -1;
                    while (text.indexOf("\n") != -1){
                        line = text.substring(0, text.indexOf("\n"));
                        if (line.substring(0, 6) == "newmtl"){
                            i = i + 1;
                            material[i] = new Array(4);
                            material[i][0] = line.substring(line.indexOf(" ") + 1);
                        }
                        //Kd, ddifuse color, usefull
                        //Ka, ambient color, not implemented
                        //Ks, specular color, not implemented
                        //d or TR, transparency, not now
                        else if (line.substring(0, 3) == "Kd "){
                            line = line.substring(3);
                            material[i][1] = line.substring(0, line.indexOf(" "));
                            line = line.substring(line.indexOf(" ") + 1);
                            material[i][2] = line.substring(0, line.indexOf(" "));
                            line = line.substring(line.indexOf(" ") + 1);
                            material[i][3] = line;
                        }
                        text = text.substring(text.indexOf("\n") + 1);
                    }
                    totalMaterial = material.length;
                    if (totalMaterial == 0){
                        hasMtl = false;
                    }
                };

                /********************************************************************
                 * Function that automatically calculates the best scale for the    *
                 * modelermined number of elements, containing the verices that     *
                 * form a face, so the bigest dimension from the object can fit in  *
                 * the smallest dimension of the canvas.                            *
                 * #parameters:                                                     *
                 *   text (int): the farthest vertex, from the center.              *
                 * #return: (int) The scale to be aplied.                           *
                 * #scope: private                                                  *
                 ********************************************************************/
                var calculateScale = function(max){
                    var dim;
                    if (canvas.width < canvas.height){
                        dim = canvas.width;
                    }
                    else{
                        dim = canvas.height;
                    }
                    var sc = Math.round((0.95 * dim) / (2 * max));
                    return sc;
                };

                /********************************************************************
                 * Function that compares the average Z coordinate of two faces.    *
                 * Must be used when sorting the face array.                        *
                 * #parameters:                                                     *
                 *   a (Array): One face.                                           *
                 *   b (Array): The other face.                                     *
                 * #return: (int) -1, 1 or 0.                                       *
                 * #scope: private                                                  *
                 ********************************************************************/
                var faceComparator = function(a,b){
                    var aZ;
                    var bZ;
                    var i = 0;
                    var sum = 0.0;
                    while (i < a.length - 1){
                        sum = sum + parseFloat(vert[a[i]][2]);
                        i = i + 1;
                    }
                    aZ = sum / parseFloat(i);
                    i = 0;
                    sum = 0;
                    while (i < b.length - 1){
                        sum = sum + parseFloat(1 * vert[b[i]][2]);
                        i = i + 1;
                    }
                    bZ = sum / parseFloat(i);
                    if (aZ < bZ) return -1;
                    if (aZ > bZ) return 1;
                    return 0;
                };

                /********************************************************************
                 * Function that writes text in the corner of the canvas. Must be   *
                 * called when everithing has been drawn.                           *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var writeCredits = function(){
                    /*ctx.fillStyle = textColor;
                    ctx.font = "12px Arial";
                    var h = canvas.height / 2 - 14;
                    var w = 10 - (canvas.width / 2);
                    ctx.fillText("ObJS:   " + totalVert + " vertices   " + totalFace + " faces   " + totalMaterial + " materials", w, h);*/
                    document.getElementById('details_verts').innerHTML = totalVert + ' vertices';
                    document.getElementById('details_faces').innerHTML = totalFace + ' faces';
                    document.getElementById('details_materials').innerHTML = totalMaterial + ' materials';
                };

                var drawSides = function(){
                    var sScale = scale * 0.2;

                    // TOP
                    topCtx.clearRect(0, 0, canvas.width, canvas.height);
                    topCtx.fillStyle = "#ffffff";
                    topCtx.fillRect(-topCanvas.width / 2, -topCanvas.height / 2, topCanvas.width, canvas.height);
                    var des = Math.PI / 2;
                    for (var i = 0; i < vert.length; i ++) {
                        var y = vert[i][1];
                        var z = vert[i][2];
                        vert[i][1] = y * Math.cos(des) - z * Math.sin(des);
                        vert[i][2] = z * Math.cos(des) + y * Math.sin(des);
                    }
                    for (var i = 0; i < face.length; i++){
                        topCtx.strokeStyle = '#00000099';
                        topCtx.beginPath();
                        topCtx.moveTo(50 + (sScale * vert[face[i][0]][0]), 50 + (sScale * vert[face[i][0]][1]));
                        for (var j = 1; j < face[i].length - 1; j++) {
                            topCtx.lineTo(50 + (sScale * vert[face[i][j]][0]), 50 + (sScale * vert[face[i][j]][1]));
                            //topCtx.stroke();
                        }
                        topCtx.closePath();
                        if (useMtl){
                            //Get material with the same name as the one in the last element of the face
                            j = 0;
                            while (material[j][0] != face[i][face[i].length - 1] && j < material.length){
                                j = j + 1;
                            }
                            if (material[j][0] == face[i][face[i].length - 1]){
                                topCtx.fillStyle = "rgba(" + Math.round(255 * material[j][1]) + ", " + Math.round(255 * material[j][2]) + ", " + Math.round(255 * material[j][3]) + ", " + 1 + ")";
                            }
                            else{
                                topCtx.fillStyle = faceColor;
                            }
                        }
                        else{
                            topCtx.fillStyle = faceColor;
                        }
                        topCtx.stroke();
                        if(dFaces){
                            topCtx.fill();
                        }
                    }
                    //restore
                    des = Math.PI / -2;
                    for (var i = 0; i < vert.length; i ++) {
                        var y = vert[i][1];
                        var z = vert[i][2];
                        vert[i][1] = y * Math.cos(des) - z * Math.sin(des);
                        vert[i][2] = z * Math.cos(des) + y * Math.sin(des);
                    }

                    // FRONT
                    frontCtx.clearRect(0, 0, canvas.width, canvas.height);
                    frontCtx.fillStyle = "#ffffff";
                    frontCtx.fillRect(-frontCanvas.width / 2, -frontCanvas.height / 2, frontCanvas.width, canvas.height);
                    des = Math.PI / 2;
                    for (var i = 0; i < face.length; i++){
                        frontCtx.strokeStyle = '#00000099';
                        frontCtx.beginPath();
                        frontCtx.moveTo(50 + (sScale * vert[face[i][0]][0]), 50 + (sScale * vert[face[i][0]][1]));
                        for (var j = 1; j < face[i].length - 1; j++) {
                            frontCtx.lineTo(50 + (sScale * vert[face[i][j]][0]), 50 + (sScale * vert[face[i][j]][1]));
                            //frontCtx.stroke();
                        }
                        frontCtx.closePath();
                        if (useMtl){
                            //Get material with the same name as the one in the last element of the face
                            j = 0;
                            while (material[j][0] != face[i][face[i].length - 1] && j < material.length){
                                j = j + 1;
                            }
                            if (material[j][0] == face[i][face[i].length - 1]){
                                frontCtx.fillStyle = "rgba(" + Math.round(255 * material[j][1]) + ", " + Math.round(255 * material[j][2]) + ", " + Math.round(255 * material[j][3]) + ", " + 1 + ")";
                            }
                            else{
                                frontCtx.fillStyle = faceColor;
                            }
                        }
                        else{
                            frontCtx.fillStyle = faceColor;
                        }
                        frontCtx.stroke();
                        if(dFaces){
                            frontCtx.fill();
                        }
                    }

                    // SIDE
                    sideCtx.clearRect(0, 0, canvas.width, canvas.height);
                    sideCtx.fillStyle = "#ffffff";
                    sideCtx.fillRect(-sideCanvas.width / 2, -sideCanvas.height / 2, sideCanvas.width, canvas.height);
                    des = Math.PI / 2;
                    for (var i = 0; i < vert.length; i ++) {
                        var x = vert[i][0];
                        var z = vert[i][2];
                        vert[i][0] = x * Math.cos(des) - z * Math.sin(des);
                        vert[i][2] = z * Math.cos(des) + x * Math.sin(des);
                    }
                    for (var i = 0; i < face.length; i++){
                        sideCtx.strokeStyle = '#00000099';
                        sideCtx.beginPath();
                        sideCtx.moveTo(50 + (sScale * vert[face[i][0]][0]), 50 + (sScale * vert[face[i][0]][1]));
                        for (var j = 1; j < face[i].length - 1; j++) {
                            sideCtx.lineTo(50 + (sScale * vert[face[i][j]][0]), 50 + (sScale * vert[face[i][j]][1]));
                            //sideCtx.stroke();
                        }
                        sideCtx.closePath();
                        if (useMtl){
                            //Get material with the same name as the one in the last element of the face
                            j = 0;
                            while (material[j][0] != face[i][face[i].length - 1] && j < material.length){
                                j = j + 1;
                            }
                            if (material[j][0] == face[i][face[i].length - 1]){
                                sideCtx.fillStyle = "rgba(" + Math.round(255 * material[j][1]) + ", " + Math.round(255 * material[j][2]) + ", " + Math.round(255 * material[j][3]) + ", " + 1 + ")";
                            }
                            else{
                                sideCtx.fillStyle = faceColor;
                            }
                        }
                        else{
                            sideCtx.fillStyle = faceColor;
                        }
                        sideCtx.stroke();
                        if(dFaces){
                            sideCtx.fill();
                        }
                    }
                    //Restore
                    des = Math.PI / -2;
                    for (var i = 0; i < vert.length; i ++) {
                        var x = vert[i][0];
                        var z = vert[i][2];
                        vert[i][0] = x * Math.cos(des) - z * Math.sin(des);
                        vert[i][2] = z * Math.cos(des) + x * Math.sin(des);
                    }
                };

                /********************************************************************
                 * Function that draws th vertices, faces and edges in the canvas.  *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var draw = function(){
                    face = face.sort(faceComparator).reverse();
                    clearCanvas();
                    for (var i = 0; i < face.length; i++){
                        ctx.strokeStyle = edgeColor;
                        ctx.fillStyle = vertColor;
                        ctx.beginPath();
                        ctx.moveTo(scale * vert[face[i][0]][0], scale * vert[face[i][0]][1]);
                        for (var j = 1; j < face[i].length - 1; j++) {
                            ctx.lineTo(scale * vert[face[i][j]][0], scale * vert[face[i][j]][1]);
                            if(dEdges){
                                ctx.stroke();
                            }
                            if(dVerts){
                                var x = scale * vert[face[i][j]][0] - (vertSize / 2);
                                var w = vertSize;
                                var y = scale * vert[face[i][j]][1] - (vertSize / 2);
                                var h = vertSize;
                                ctx.fillRect(x, y, w, h);
                            }
                        }
                        ctx.closePath();
                        if (useMtl){
                            //Get material with the same name as the one in the last element of the face
                            j = 0;
                            while (material[j][0] != face[i][face[i].length - 1] && j < material.length){
                                j = j + 1;
                            }
                            if (material[j][0] == face[i][face[i].length - 1]){
                                ctx.fillStyle = "rgba(" + Math.round(255 * material[j][1]) + ", " + Math.round(255 * material[j][2]) + ", " + Math.round(255 * material[j][3]) + ", " + faceAlpha + ")";
                            }
                            else{
                                ctx.fillStyle = faceColor;
                            }
                        }
                        else{
                            ctx.fillStyle = faceColor;
                        }
                        if(dFaces){
                            ctx.fill();
                        }
                    }
                    writeCredits();
                };

                /********************************************************************
                 * TODO: Function used when something in the canvas is clicked.     *
                 * #parameters: none                                                *
                 * #return: nothing                                                 *
                 * #scope: private                                                  *
                 ********************************************************************/
                var mouseClick = function(){
                };

                thisObJS = this;
                return this;
            }
        </script>
        <style>
            body{
                text-align: center;
                background-color: #002200;
            }
            h1{
                margin-bottom: 0;
                color: #ffffff;
            }
            h2{
                font-size: 110%;
                font-style: italic;
                margin-top: 0;
                color: #ffffff;
            }
            section{
                display: inline-block;
                vertical-align: top;
                height: 526px;
                margin: 0;
                border: 2px solid #000000;
            }
            section h3{
                height: 24px;
                margin: 0;
                border-bottom: 2px solid #000000;
                background-color: #cceeff;
            }
            section#sideViews{
                width: 120px;
                background-color: #e0f5ff;
                border-top-left-radius: 20px;
                border-bottom-left-radius: 20px;
            }
            section#sideViews h3{
                border-top-left-radius: 20px;
            }
            section#sideViews h4{
                margin: 10px auto 0 auto;
            }
            section#sideViews canvas{
                border: 0.1em solid #000000;
                margin: 0 10px 10px 10px;
                background-color: #ffffff;
            }
            section#sideViews div#details{
                margin-top: 20px;
            }
            section#sideViews div#details span{
                font-size: 70%;
                display: block;
                color: #444444;
                font-weight: bold;
            }
            section#controls{
                text-align: center;
                width: 260px;
                background-color: #e0f5ff;
                border-top-right-radius: 20px;
                border-bottom-right-radius: 20px;
            }
            section#controls h3{
                border-top-right-radius: 20px;
                margin-bottom: 20px;
            }
            section#controls table#colors{
                margin: 20px auto;
                border-collapse: collapse;
            }
            section#controls table#colors td{
                border: 1px solid #000000;
            }
            section#controls table#colors td img{
                width: 30px;
                height: 30px;
            }
            section#controls table#colors td input[type="color"]{
                width: 30px;
                height: 30px;
                padding: 1px;
            }
            section#controls input[type="range"]{
                display: block;
                width: 80%;
                margin: auto auto 15px auto;
            }
            canvas#ObJSView{
                width: 500px;
                height: 500px;
            }
            td#ObJSControl input[type="color"]{
                width: 1.3em;
                height: 1.3em;
                padding: 0;
                vertical-align: middle;
            }
            td#ObJSControl input[type="range"]{
                vertical-align: middle;
            }
        </style>
    </head>
    <body onload="objs = new ObJS(); objs.initCanvas();objs.load(document.getElementById('objSelector').value);">
        <h1>
            ObJS
        </h1>
        <h2>
            by I&ntilde;igo Valentin
        </h2>
        <section id='sideViews'>
            <h3>
                Details
            </h3>
            <h4>
                Top
            </h4>
            <canvas id="ObJSTop" width="100" height="100">
                Your browser does not support the HTML5 canvas tag.
            </canvas>
            <h4>
                Front
            </h4>
            <canvas id="ObJSFront" width="100" height="100">
                Your browser does not support the HTML5 canvas tag.
            </canvas>
            <h4>
                Side
            </h4>
            <canvas id="ObJSSide" width="100" height="100">
                Your browser does not support the HTML5 canvas tag.
            </canvas>
            <div id='details'>
                <span id='details_verts'></span>
                <span id='details_faces'></span>
                <span id='details_materials'></span>
            </div>
        </section>
        <section id='view'>
            <h3>
                View
            </h3>
            <canvas id="ObJSView" width="500" height="500">
                Your browser does not support the HTML5 canvas tag.
            </canvas>
        </section>
        <section id='controls'>
            <h3>
                Controls
            </h3>
            Choose a model:
            <select id="objSelector" onChange="objs.load(this.value)">
                <option value="obj/rainbow.obj" selected="selected">Rainbow</option>
                <option value="obj/cube.obj">Cube</option>
                <option value="obj/sphere.obj">Sphere</option>
                <option value="obj/star.obj">Star</option>
                <option value="obj/monkey.obj">Monkey</option>
                <option value="obj/bolt.obj">Bolt</option>
                <option value="obj/multiple.obj">Multiple Objects</option>
                <option value="obj/seaplane.obj">Seaplane (Can freeze browser)</option>
            </select>
            <table id='colors'>
                <tr>
                    <td>
                    </td>
                    <td>
                        <img src='img/eye.png'/>
                    </td>
                    <td>
                        <img src='img/color.png'/>
                    </td>
                </tr>
                <tr>
                    <td>
                        <img src='img/vert.png'/>
                    </td>
                    <td>
                        <input type="checkbox"  value="verts" checked onChange="objs.drawVertizes(this.checked);"/>
                    </td>
                    <td>
                        <input type="color"  value="#0A0A0A" onChange="objs.severtizesColor(this.value);"/>
                    </td>
                </tr>
                <tr>
                    <td>
                        <img src='img/line.png'/>
                    </td>
                    <td>
                        <input type="checkbox" value="edges" checked onChange="objs.drawEdges(this.checked);"/>
                    </td>
                    <td>
                        <input type="color" value="#644646" onChange="objs.setEdgesColor(this.value);"/>
                    </td>
                </tr>
                <tr>
                    <td>
                        <img src='img/face.png'/>
                    </td>
                    <td>
                        <input type="checkbox" value="faces" checked onChange="objs.drawFaces(this.checked);"/>
                    </td>
                    <td>
                        <input type="color" value="#B4B4FF" onChange="objs.sefacesColor(this.value);"/>
                        <!-- <input type="checkbox" checked onChange="objs.linkMaterial(this.checked);"/>Use materials -->
                    </td>
                </tr>
                <tr>
                    <td>
                        <img src='img/bg.png'/>
                    </td>
                    <td>
                        <input type="checkbox" value="backg" checked onChange="objs.drawBackground(this.checked);"/>
                    </td>
                    <td>
                        <input type="color" value="#C8C8C8" onChange="objs.setBackgroundColor(this.value)"/>
                    </td>
                </tr>
            </table>
            Alpha:
            <input type="range" min="0" max="100" step="1" value="60" onInput="objs.setAlpha(this.value);" onChange="objs.setAlpha(this.value);"/>
            Rotation speed:
            <input type="range" min="0" max="10" step="1" value="3" onInput="objs.setRotationSpeed(this.value);" onChange="objs.setRotationSpeed(this.value);"/>
            Zoom speed:
            <input type="range" min="0" max="10" step="1" value="2" onInput="objs.setZoomSpeed(this.value);" onChange="objs.setZoomSpeed(this.value);"/>
            Movement speed:
            <input type="range" min="0" max="10" step="1" value="5" onInput="objs.setMovementSpeed(this.value);" onChange="objs.setMovementSpeed(this.value);"/>
        </section>
    </body>
</html>