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PODetect mouse click location within canvas
 

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    <p>I'm having a real issue trying to define a function for where I click on empty space. So far I have managed to define where I click on an object - of which there are 10 - but now I need a separate function for when I am not clicking on any of the objects. The general idea can be found at <a href="http://deciballs.co.uk/experience.html" rel="nofollow">http://deciballs.co.uk/experience.html</a>. The objects are the rings. My code is below... Any ideas?</p> <pre><code>var shapeObj = function (context, canvas, settingsBox, radius) { this.ctx = context; this.canvas = canvas; this.sBox = settingsBox; this.frequencies = new Array(220, 440, 1024, 2048); this.cols = new Array(255, 225, 200, 175, 150); this.strokes = new Array(1, 1.5, 2); this.waves = new Array('sine', 'sawtooth', 'triangle', 'square'); this.properties = { dur: Math.random()*0.5, freq: this.frequencies[Math.floor(Math.random() * this.frequencies.length)], radius: radius, stroke: this.strokes[Math.floor(Math.random() * this.strokes.length)], speed: Math.random()*6-3, vol: Math.random()*10, col1: this.cols[Math.floor(Math.random() * this.cols.length)], col2: this.cols[Math.floor(Math.random() * this.cols.length)], col3: this.cols[Math.floor(Math.random() * this.cols.length)], alpha: 0, wave: this.waves[Math.floor(Math.random() * this.waves.length)], delay: 0 } this.x = Math.random()*this.ctx.canvas.width; this.y = Math.random()*this.ctx.canvas.height; this.vx = 0.5; this.vy = 1; this.draw = function () { this.ctx.beginPath(); this.ctx.arc(this.x, this.y, this.properties.radius, 0, Math.PI*2, false); this.ctx.closePath(); this.ctx.stroke(); this.ctx.fill(); } this.clickTest = function (e) { var canvasOffset = this.canvas.offset(); var canvasX = Math.floor(e.pageX-canvasOffset.left); var canvasY = Math.floor(e.pageY-canvasOffset.top); var dX = this.x-canvasX; var dY = this.y-canvasY; var distance = Math.sqrt((dX*dX)+(dY*dY)); if (distance &lt; this.properties.radius) { this.manageClick(); } else { this.properties.alpha = 0; } }; this.manageClick = function () { this.sBox.populate(this.properties, this); var divs = document.getElementsByTagName('section'); for(var i = 0, e = divs[0], n = divs.length; i &lt; n; e = divs[++i]){ e.className='class2'; } this.properties.alpha = 0.5; } } </code></pre>
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    1. COthis is a vague question.
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    2. COIs this what you're looking for: [Getting mouse location in canvas](http://stackoverflow.com/questions/1114465/getting-mouse-location-in-canvas)?
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      1. USBrandon Boone
    3. COSort of, the project can be found at http://deciballs.co.uk/experience.html if that gives you a better idea?
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