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    <p><a href="http://jsfiddle.net/eGjak/503/" rel="nofollow">http://jsfiddle.net/eGjak/503/</a></p> <p>You have to find the local x and y on the canvas, then calculate the distance ( think pythagorean theorem, aSquared + bSquare = cSquared ), and see if the distance is less than the radius of the circle( aka mouse is within the circle )</p> <p>Add this code after the code you currently have</p> <pre><code>var focused_circle, lastX, lastY ; function test_distance( n, test_circle ){ //see if the mouse is clicking circles var dx = lastX - test_circle.x, dy = lastY - test_circle.y; //see if the distance between the click is less than radius if( dx * dx + dy * dy &lt; test_circle.r * test_circle.r ){ focused_circle = n; $(document).bind( 'mousemove.move_circle' , drag_circle ); $(document).bind( 'mouseup.move_circle' , clear_bindings); return false; // in jquery each, this is like break; stops checking future circles } } $('#cv').mousedown( function( e ){ lastX = e.pageX - $(this).offset().left; lastY = e.pageY - $(this).offset().top; $.each( circles, test_distance ); }); function drag_circle( e ){ var newX = e.pageX - $('#cv').offset().left, newY = e.pageY - $('#cv').offset().top; //set new values circles[ focused_circle ].x += newX - lastX; circles[ focused_circle ].y += newY - lastY; //remember these for next time lastX = newX, lastY = newY; //clear canvas and redraw everything ctx.clearRect( 0, 0, ctx.canvas.width, ctx.canvas.height ); drawCircle(mainCircle); $.each(circles, function() { drawCircle(this); drawLine(mainCircle, this); }); } function clear_bindings( e ){ // mouse up event, clear the moving and mouseup bindings $(document).unbind( 'mousemove.move_circle mouseup.move_circle' ); focused_circle=undefined; } </code></pre> <p>There are other ways to do this and ways to save on speed, though this should do the trick.</p>
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    1. COyou are correct, i implemented this using jsplumb and jQuery http://webxtreams.net/demoprofiles004/circledragger.html have little problem with this, how can i limit drop circle on another circle :)
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