gyorgyf@0: var Application = {
gyorgyf@0:   init: function() {
gyorgyf@0:     this.canvas = document.getElementById('canvas');
gyorgyf@0:     this.marker = document.getElementById('marker');
gyorgyf@0:     this.label = document.getElementById('label');
gyorgyf@0: 
mgeorgi@23:     this.canvas.addEventListener('mousedown', this.onMouseDown.bind(this));
mgeorgi@23:     this.canvas.addEventListener('mousemove', this.onMouseMove.bind(this));
mgeorgi@23:     this.canvas.addEventListener('mouseup', this.onMouseUp.bind(this));
gyorgyf@0:     
mgeorgi@23:     this.request("/moods.csv", this.loadMoods.bind(this));
mgeorgi@9:     this.background();
mgeorgi@9:   },
mgeorgi@9: 
mgeorgi@9:   tl: { r: 200, g: 0, b: 0 },
mgeorgi@9:   tr: { r: 200, g: 150, b: 0 },
mgeorgi@9:   bl: { r: 0, g: 50, b: 100 },
mgeorgi@9:   br: { r: 200, g: 230, b: 80 },
mgeorgi@9:   
mgeorgi@9:   interpolateColor: function(a, b, x) {
mgeorgi@9:     return {
mgeorgi@9:       r: Math.floor(a.r + (b.r - a.r) * x),
mgeorgi@9:       g: Math.floor(a.g + (b.g - a.g) * x),
mgeorgi@9:       b: Math.floor(a.b + (b.b - a.b) * x)
mgeorgi@9:     };
mgeorgi@9:   },
mgeorgi@9: 
mgeorgi@23:   background: function() {
mgeorgi@9:     var step = 20;
mgeorgi@9:     var ctx = this.canvas.getContext("2d");  
mgeorgi@9:     ctx.clearRect(0, 0, 320, 320);
mgeorgi@9: 
mgeorgi@9:     for (var y = 0; y < 320; y += step) {
mgeorgi@9:       var left = this.interpolateColor(this.tl, this.bl, y / 320);
mgeorgi@9:       var right = this.interpolateColor(this.tr, this.br, y / 320);
mgeorgi@9:       for (var x = 0; x < 320; x += step) {
mgeorgi@9:         var color = this.interpolateColor(left, right, x / 320);
mgeorgi@9:         ctx.fillStyle = "rgb(" + color.r + "," + color.g + "," + color.b + ")";
mgeorgi@9:         ctx.fillRect(x, y, step, step);
mgeorgi@9:       }
mgeorgi@9:     }
mgeorgi@9:     ctx.strokeStyle = "rgb(0,0,0)";
mgeorgi@9:     ctx.moveTo(0, 160);
mgeorgi@9:     ctx.lineTo(320, 160);
mgeorgi@9:     ctx.stroke();
mgeorgi@9:     
mgeorgi@9:     ctx.fillStyle = "rgb(0,0,0)";
mgeorgi@9:     ctx.beginPath();
mgeorgi@9:     ctx.moveTo(320, 160);
mgeorgi@9:     ctx.lineTo(310, 150);
mgeorgi@9:     ctx.lineTo(310, 170);
mgeorgi@9:     ctx.fill();
mgeorgi@9: 
mgeorgi@9:     ctx.strokeStyle = "rgb(0,0,0)";
mgeorgi@9:     ctx.moveTo(160, 320);
mgeorgi@9:     ctx.lineTo(160, 0);
mgeorgi@9:     ctx.stroke();
mgeorgi@9:     
mgeorgi@9:     ctx.fillStyle = "rgb(0,0,0)";
mgeorgi@9:     ctx.beginPath();
mgeorgi@9:     ctx.moveTo(160, 0);
mgeorgi@9:     ctx.lineTo(150, 10);
mgeorgi@9:     ctx.lineTo(170, 10);
mgeorgi@9:     ctx.fill();
mgeorgi@9: 
mgeorgi@9:     ctx.font = "16px Arial";
mgeorgi@9:     ctx.fillText("Valence", 200, 158);  
mgeorgi@9:     
mgeorgi@9:     ctx.save();
mgeorgi@9:     ctx.translate(158, 120);
mgeorgi@9:     ctx.rotate(Math.PI * 1.5);
mgeorgi@9:     ctx.font = "16px Arial";
mgeorgi@9:     ctx.fillText("Arousal", 0, 0);  
mgeorgi@9:     ctx.restore();
gyorgyf@0:   },
gyorgyf@0: 
mgeorgi@6:   loadMoods: function(text) {
gyorgyf@0:     this.moods = [];
gyorgyf@0: 
gyorgyf@0:     var lines = text.split("\n");
mgeorgi@6:     
mgeorgi@6:     for (var i = 1; i < lines.length; i++) {
mgeorgi@6:       var row = lines[i].split(",");
mgeorgi@6:       var mood = {
mgeorgi@9:         label: row[0],
mgeorgi@9:         val: Number(row[1]), 
mgeorgi@9:         aro: Number(row[2]),
mgeorgi@9:         dom: Number(row[3])
mgeorgi@6:       };
mgeorgi@6:       this.moods.push(mood);
mgeorgi@6:     }
mgeorgi@6:   },
mgeorgi@9:  
gyorgyf@0:   request: function(url, callback) {
gyorgyf@0:     var request = new XMLHttpRequest();
gyorgyf@0:     request.onreadystatechange = function() {
mgeorgi@6:       if (callback) {
mgeorgi@6:         callback(request.responseText);
mgeorgi@6:       }
gyorgyf@0:     }.bind(this);
gyorgyf@0:     request.open("GET", url);
gyorgyf@0:     request.send(null);
gyorgyf@0:   },
gyorgyf@0: 
mgeorgi@23:   onMouseDown: function(event) {
mgeorgi@23:     this.mouseDown = true;
mgeorgi@23:     this.setMarker(event.pageX, event.pageY);
gyorgyf@0:   },
gyorgyf@0: 
mgeorgi@23:   onMouseMove: function(event) {
mgeorgi@23:     if (this.mouseDown) {
mgeorgi@23:       this.setMarker(event.pageX, event.pageY);
mgeorgi@23:     }
gyorgyf@0:   },
gyorgyf@0: 
mgeorgi@23:   onMouseUp: function(event) {
mgeorgi@23:     this.mouseDown = false;
mgeorgi@23:     this.setMarker(event.pageX, event.pageY);
gyorgyf@0:   },
gyorgyf@0: 
mgeorgi@6:   setMarker: function(pageX, pageY) {
mgeorgi@9:     this.background();
mgeorgi@9:     this.drawMarker(pageX, pageY);
mgeorgi@9: 
mgeorgi@6:     var x = pageX / 320;
mgeorgi@6:     var y = 1 - pageY / 320;
mgeorgi@6:     
mgeorgi@6:     var mood = this.findMood(x, y);
mgeorgi@6: 
mgeorgi@23:     if (mood != this.mood) {
mgeorgi@23:       this.label.innerHTML = mood.label;
mgeorgi@23:       this.mood = mood;
mgeorgi@23:       this.request("/mood?x=" + x + "&y=" + y);
mgeorgi@23:     }
mgeorgi@23:   },
mgeorgi@23:   
mgeorgi@23:   drawMarker: function(x, y) {
mgeorgi@23:     var ctx = this.canvas.getContext("2d");  
mgeorgi@23:     ctx.fillStyle = "rgba(0, 0, 0, 0.5)";
mgeorgi@23:     ctx.beginPath();
mgeorgi@23:     ctx.arc(x, y, 20, 0, Math.PI*2, true); 
mgeorgi@23:     ctx.fill();
mgeorgi@9:   },
mgeorgi@6: 
mgeorgi@6:   findMood: function(x, y) {
mgeorgi@6:     var distance = 1;
mgeorgi@6:     var index = null;
gyorgyf@0:     
gyorgyf@0:     for (var i = 0; i < this.moods.length; i++) {
gyorgyf@0:       var mood = this.moods[i];
mgeorgi@9:       var dx = Math.abs(mood.val - x);
mgeorgi@9:       var dy = Math.abs(mood.aro - y);
mgeorgi@6:       var d = Math.sqrt(dx * dx + dy * dy);
gyorgyf@0: 
mgeorgi@6:       if (d < distance) {
mgeorgi@6:         distance = d;
mgeorgi@6:         index = i;
gyorgyf@0:       }
gyorgyf@0:     }
gyorgyf@0: 
mgeorgi@6:     return this.moods[index];
gyorgyf@0:   }
mgeorgi@23: };