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POCollision Response between a static and dynamic circle
 

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  1. POCollision Response between a static and dynamic circle
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    <p>This is developed in JavaFX.</p> <p>There are 2 balls - a dynamic ball and a stationary one. The first ball(dynamic) bounces off the walls and anything that comes in its way.</p> <p>The second ball's purpose is to be an obstacle for the first ball. So, whenever the first ball touches the second ball, the first ball should instantly bounce away. Currently, the bouncing has very bad accuracy, and I don't know exactly how to fix it. Sometimes the first ball will bounce properly, but usually it will go <strong>INSIDE</strong> the second ball, get stuck in there for a moment, and then bounce away. The picture below goes over this exact issue. <img src="https://i.stack.imgur.com/RrnAF.png" alt="enter image description here"> </p> <p>Here's my code for detecting collision and responding to it:</p> <pre><code> //Pythagorean Theorem, to detect collision, by estimating the distance between the two circles double dx = circle.getLayoutX() - circle2.getLayoutX(); double dy = circle.getLayoutY() - circle2.getLayoutY(); double radii = circle.getRadius() + circle2.getRadius(); double distance = (dx * dx) + (dy * dy); double minDistance = radii * radii; // I believe something is missing in the lines below, which is causing the problem. if (distance &lt; minDistance) { //If circle1(dynamic) collides with circle2(stationary) c1SpeedX = c1SpeedX * -1; //Inverts direction. } </code></pre> <p>I spent hours on google, but I was not able to find an answer. I hope somebody can provide a solution and explain the issue. Thanks a lot in advance everybody!</p>
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    1. COLogically wouldn't you want `distant <= minDistance`? I've not looked at all the details yet but this struck me as odd. Ironically a similar question has been asked: http://stackoverflow.com/questions/4613345/python-pygame-ball-collision-with-interior-of-circle?rq=1
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    2. COI've tried both < and <= and it makes no difference at all.
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