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    <p>Maybe this is an old question, but I think to have the solution for anyone else that will read this post:</p> <pre><code>/** Rectangle To Point. */ boolean testRectangleToPoint(double rectWidth, double rectHeight, double rectRotation, double rectCenterX, double rectCenterY, double pointX, double pointY) { if(rectRotation == 0) // Higher Efficiency for Rectangles with 0 rotation. return Math.abs(rectCenterX-pointX) &lt; rectWidth/2 &amp;&amp; Math.abs(rectCenterY-pointY) &lt; rectHeight/2; double tx = Math.cos(rectRotation)*pointX - Math.sin(rectRotation)*pointY; double ty = Math.cos(rectRotation)*pointY + Math.sin(rectRotation)*pointX; double cx = Math.cos(rectRotation)*rectCenterX - Math.sin(rectRotation)*rectCenterY; double cy = Math.cos(rectRotation)*rectCenterY + Math.sin(rectRotation)*rectCenterX; return Math.abs(cx-tx) &lt; rectWidth/2 &amp;&amp; Math.abs(cy-ty) &lt; rectHeight/2; } /** Circle To Segment. */ boolean testCircleToSegment(double circleCenterX, double circleCenterY, double circleRadius, double lineAX, double lineAY, double lineBX, double lineBY) { double lineSize = Math.sqrt(Math.pow(lineAX-lineBX, 2) + Math.pow(lineAY-lineBY, 2)); double distance; if (lineSize == 0) { distance = Math.sqrt(Math.pow(circleCenterX-lineAX, 2) + Math.pow(circleCenterY-lineAY, 2)); return distance &lt; circleRadius; } double u = ((circleCenterX - lineAX) * (lineBX - lineAX) + (circleCenterY - lineAY) * (lineBY - lineAY)) / (lineSize * lineSize); if (u &lt; 0) { distance = Math.sqrt(Math.pow(circleCenterX-lineAX, 2) + Math.pow(circleCenterY-lineAY, 2)); } else if (u &gt; 1) { distance = Math.sqrt(Math.pow(circleCenterX-lineBX, 2) + Math.pow(circleCenterY-lineBY, 2)); } else { double ix = lineAX + u * (lineBX - lineAX); double iy = lineAY + u * (lineBY - lineAY); distance = Math.sqrt(Math.pow(circleCenterX-ix, 2) + Math.pow(circleCenterY-iy, 2)); } return distance &lt; circleRadius; } /** Rectangle To Circle. */ boolean testRectangleToCircle(double rectWidth, double rectHeight, double rectRotation, double rectCenterX, double rectCenterY, double circleCenterX, double circleCenterY, double circleRadius) { double tx, ty, cx, cy; if(rectRotation == 0) { // Higher Efficiency for Rectangles with 0 rotation. tx = circleCenterX; ty = circleCenterY; cx = rectCenterX; cy = rectCenterY; } else { tx = Math.cos(rectRotation)*circleCenterX - Math.sin(rectRotation)*circleCenterY; ty = Math.cos(rectRotation)*circleCenterY + Math.sin(rectRotation)*circleCenterX; cx = Math.cos(rectRotation)*rectCenterX - Math.sin(rectRotation)*rectCenterY; cy = Math.cos(rectRotation)*rectCenterY + Math.sin(rectRotation)*rectCenterX; } return testRectangleToPoint(rectWidth, rectHeight, rectRotation, rectCenterX, rectCenterY, circleCenterX, circleCenterY) || testCircleToSegment(tx, ty, circleRadius, cx-rectWidth/2, cy+rectHeight/2, cx+rectWidth/2, cy+rectHeight/2) || testCircleToSegment(tx, ty, circleRadius, cx+rectWidth/2, cy+rectHeight/2, cx+rectWidth/2, cy-rectHeight/2) || testCircleToSegment(tx, ty, circleRadius, cx+rectWidth/2, cy-rectHeight/2, cx-rectWidth/2, cy-rectHeight/2) || testCircleToSegment(tx, ty, circleRadius, cx-rectWidth/2, cy-rectHeight/2, cx-rectWidth/2, cy+rectHeight/2); } </code></pre> <p>This is the code to test Collisions between a circle (The Ball) and a rectangle (That can rotate).</p>
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