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I have HTML 5 circle drag and drop example,

http://jsfiddle.net/eGjak/503/

i want to follow things

  1. prevent drag circles outside of the canvas

  2. hide lines over the circles

  3. prevent drag over another circle

i play with some codes but no luck there. can anyone please help me, by logic or some helpful resource

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  • Hello, do you have a working example of your requirements? I'm really interested in how you implemented the collision prevention. I know how to detect collision but not how to prevent it. Commented Feb 25, 2014 at 15:05

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  1. This is an easy one. It's simply checking x doesn't leave the left or right side of the screen and y doesn't leave the top or bottom of the screen

    if (x>0 || x<(canvas.width - circle.width) && y>0 || y<(canvas.height - circle.height)) {

    ...update...

    }

  2. Here you need to do a line/circle collision check. See here.

  3. For this you need circle/circle collision detection. The below will return true if collided otherwise false:

    this.isIntersecting = function(c1center, c1radius, c2center, c2radius) { var dX = Math.pow(c1center.x - c2center.x, 2); var dY = Math.pow(c1center.y - c2center.y, 2); var r2 = Math.pow(c1radius.radius() + c2radius.radius(), 2); return (dX + dY <= r2); }

c1center and c2center are object with x, y properties (eg: c1center = {x:0, y:0 })

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