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POChanging color of Javascript class object dynamically?
 

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  1. POChanging color of Javascript class object dynamically?
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    <p>I want to change the color of the balls to red when they collide. I tried using my function <code>check()</code> to change the color of the balls when they collide using <code>balls[i].color</code> but how do I know the positions of the balls to compare when they collide?</p> <pre><code>function randomXToY(minVal,maxVal,floatVal) { var randVal = minVal+(Math.random()*(maxVal-minVal)); return typeof floatVal=='undefined'?Math.round(randVal):randVal.toFixed(floatVal); } // The Ball class Ball = (function() { // constructor function Ball(x,y,radius,color){ this.center = {x:x, y:y}; this.radius = radius; this.color = color; this.dx = 2; this.dy = 2; this.boundaryHeight = $('#ground').height(); this.boundaryWidth = $('#ground').width(); this.dom = $('&lt;p class="circle"&gt;&lt;/p&gt;').appendTo('#ground'); // the rectange div a circle this.dom.width(radius*2); this.dom.height(radius*2); this.dom.css({'border-radius':radius,background:color}); this.placeAtCenter(x,y); } // Place the ball at center x, y Ball.prototype.placeAtCenter = function(x,y){ this.dom.css({top: Math.round(y- this.radius), left: Math.round(x - this.radius)}); this.center.x = Math.round(x); this.center.y = Math.round(y); }; Ball.prototype.setColor = function(color) { if(color) { this.dom.css('background',color); } else { this.dom.css('background',this.color); } }; // move and bounce the ball Ball.prototype.move = function(){ var diameter = this.radius * 2; var radius = this.radius; if (this.center.x - radius &lt; 0 || this.center.x + radius &gt; this.boundaryWidth ) { this.dx = -this.dx; } if (this.center.y - radius &lt; 0 || this.center.y + radius &gt; this.boundaryHeight ) { this.dy = -this.dy; } this.placeAtCenter(this.center.x + this.dx ,this.center.y +this.dy); }; return Ball; })(); var number_of_balls = 5; var balls = []; var x; var y; $('document').ready(function(){ for (i = 0; i &lt; number_of_balls; i++) { var boundaryHeight = $('#ground').height(); var boundaryWidth = $('#ground').width(); y = randomXToY(30,boundaryHeight - 50); x = randomXToY(30,boundaryWidth - 50); var radius = randomXToY(15,30); balls.push(new Ball(x,y,radius, '#'+Math.floor(Math.random()*16777215).toString(16))); } loop(); check(); }); check = function(){ for (var i = 0; i &lt; balls.length; i++){ for(var j=0;j&lt;balls.length;j++){ if(x==y){ balls[i].color='#ff0000'; alert("y"); } else{ } }} setTimeout(check,8); }; loop = function(){ for (var i = 0; i &lt; balls.length; i++){ balls[i].move(); } setTimeout(loop, 8); }; </code></pre> <p><a href="http://jsbin.com/imofat/743/edit" rel="nofollow">http://jsbin.com/imofat/743/edit</a></p>
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    1. USJoão Silva
    1. USAditya
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    1. COThis question is poorly constructed and lacks the scope to give useful information to future readers. Consider editing your question to be more elaborate and more precise. Posting the code in question on the question page is a good way to do this.
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      1. USrecursion.ninja
    2. COPost relevant ([SSCCE](http://sscce.org/)) code *here*, and explain clearly what you've tried already and what went wrong.
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      1. USDavid Thomas
    3. CO@awashburn: Okay sir .
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