A Pen by Anupam Jain on CodePen.
Last active
June 24, 2018 07:21
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Moving Ball
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| <body> | |
| Hello World! | |
| <canvas id="my_canvas" width="300" height="300">Get Chrome...</canvas> | |
| </body> |
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| function getRandomInt(max, min){ | |
| return Math.floor(Math.random() * (+max - +min)) + +min; | |
| } | |
| window.onload = function(){ | |
| var canvas = document.getElementById("my_canvas"); | |
| c = canvas.getContext("2d"); | |
| TWO_PI = 2 * Math.PI; | |
| radius = 5; | |
| var randomX =getRandomInt(0,1); | |
| var randomY =getRandomInt(0,1); | |
| // document.write("Random Number Generated : " + random ); | |
| var posX = getRandomInt(0, canvas.width); | |
| var posY = getRandomInt(0, canvas.height); | |
| var incX = randomX == 0 ? -1 : 1; | |
| var incY = randomY == 0 ? -1 : 1; | |
| setInterval(function(){ | |
| c.fillStyle = "rgba(0,0,0,0.1)"; | |
| c.fillRect(0, 0, canvas.width, canvas.height); | |
| if(posX + radius > canvas.width || (posX < radius && incX == -1)){ | |
| incX = -incX; | |
| } | |
| if(posY + radius > canvas.height || (posY < radius && incY == -1)){ | |
| incY = -incY; | |
| } | |
| posX += incX; | |
| posY += incY; | |
| c.fillStyle = "white"; | |
| c.beginPath(); | |
| c.arc(posX,posY,radius,0,TWO_PI,false); | |
| c.fill(); | |
| }, 10); | |
| }; |
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