var x=event.clinetX-canvas.getBoundingClientRect().left; var y=event.clientY-canvas.getBoundingClientRect().top; for(var i=0;i<balls.length;i++){ context.beginPath(); context.arc(balls[i].x,balls[i].y,balls[i].r,0,Math.PI*2); if(context.isPointInPath(x,y)){ context.fillStyle="red"; context.fill(); } }
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