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HTML5 canvas click event

Asked 2010-06-18T06:48:57.657
22

I made an array of squares

ctx.fillStyle = "rgb(0,0,0)";
for(x=0;x<=25;x++){
  for(y=0;y<=25;y++){   
       ctx.fillRect(x, y, 20, 20); 
  }
}

and I want a square to change its colour when clicked. How can I do that?

I don't know much HTML5 and need some help. Thanks.

html canvas click
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1 Answer

31

Using jQuery:

First, we determine which cell was clicked, then you could just draw over that rectangle with a different colour: 

 $("#canvas").click(function(e){

    var x = Math.floor((e.pageX-$("#canvas").offset().left) / 20);
    var y = Math.floor((e.pageY-$("#canvas").offset().top) / 20);
    ctx.fillStyle = "rgb(255,255,255)";
    ctx.fillRect(x*20, y*20, 20, 20);


 });
answered 2010-06-20T18:03:58.423

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