polaryeti Posted January 19, 2023 Share Posted January 19, 2023 function checkBoundaryCollision() { if (x - ballRadius <= 0 || x + ballRadius >= canvasWidth) { dx = -dx; } if (y - ballRadius <= 0 || y + ballRadius >= canvasHeight) { dy = -dy; } } Full code here: https://codepen.io/pelko/pen/gOjXdaq Quote Link to comment https://forums.phpfreaks.com/topic/315817-what-does-the-x-and-y-value-mean-here-can-you-show-in-a-figure/ Share on other sites More sharing options...
kicken Posted January 19, 2023 Share Posted January 19, 2023 x is the center of the ball horizontally, y is the center of the ball vertically. Quote Link to comment https://forums.phpfreaks.com/topic/315817-what-does-the-x-and-y-value-mean-here-can-you-show-in-a-figure/#findComment-1604833 Share on other sites More sharing options...
Solution Barand Posted January 19, 2023 Solution Share Posted January 19, 2023 The closest x or y can be to the edge is the radius of the ball. When either of them reach that position, change direction. Quote Link to comment https://forums.phpfreaks.com/topic/315817-what-does-the-x-and-y-value-mean-here-can-you-show-in-a-figure/#findComment-1604834 Share on other sites More sharing options...
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