Created
January 27, 2015 16:53
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ball2.js
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| var canvas = document.getElementById('main'); | |
| var c = canvas.getContext('2d'); | |
| document.addEventListener('keydown', keydown); | |
| function drawBall(x, y) { | |
| c.beginPath(); | |
| c.arc(x, y, 10, 0, 2* Math.PI); | |
| c.fill(); | |
| } | |
| var offset = 10; | |
| function keydown(event) { | |
| if (event.keyCode == 40) { | |
| if (offset < 200) { | |
| offset = offset + 20; | |
| } | |
| } | |
| if (event.keyCode == 38) { | |
| if (offset > 0) { | |
| offset = offset - 20; | |
| } | |
| } | |
| } | |
| /* | |
| function onDown(even) { | |
| if (event.keyCode == 40) { | |
| if (batX < 200) { | |
| batX = batX + 20; | |
| } | |
| } | |
| if (event.keyCode == 38) { | |
| if (batX > 0) { | |
| batX = batX - 20; | |
| } | |
| } | |
| } | |
| */ | |
| var x = 0; | |
| var y = 0; | |
| var vx = 9; | |
| var vy = 4; | |
| function draw() { | |
| c.clearRect(0, 0, 400, 300); | |
| drawBall(x, y); | |
| if ((x + vx) < 20 && y > offset && y < offset + 100) { | |
| x = 20 - (x + vx - 20); | |
| vx = -vx; | |
| } else if ((x + vx) > 400) { | |
| x = 400 - (x + vx - 400); | |
| vx = -vx; | |
| } else if ((x + vx) < 0) { | |
| x = 0 - (x + vx); | |
| vx = -vx; | |
| // alert('vesztettel te utolso luzer'); | |
| } else { | |
| x = x + vx; | |
| } | |
| if ((y + vy) > 300) { | |
| y = 300 - (y + vy - 300); | |
| vy = -vy; | |
| } else if ((y + vy) < 0) { | |
| y = 0 - (y + vy); | |
| vy = -vy; | |
| } else { | |
| y = y + vy; | |
| } | |
| c.fillRect(10, offset, 10, 100); | |
| } | |
| setInterval(draw, 1000 / 30); |
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