I'm sorry about the messy code =P
Created
March 29, 2012 17:52
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easy pixel perfect collision engine demo canvas/javascript
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| <!DOCTYPE html> | |
| <title>terrain test</title> | |
| <body onkeydown=keys(1,event) onkeyup=keys(0,event)> | |
| <script> | |
| var CANVAS_WIDTH=480, CANVAS_HEIGHT=320, FPS = 30; | |
| var keydownleft=0, keydownright=0 ,keydownspace=0 ,keydownup=0 ,keydowndown=0; | |
| //mathglobalizr: https://gist.github.com/2221488 | |
| (function(a,b){for(b in a=Object.getOwnPropertyNames(Math))this[a[b]]=Math[a[b]]})() | |
| function keys(a,e){ | |
| if(e.keyCode==37)keydownleft = a | |
| if(e.keyCode==39)keydownright = a | |
| if(e.keyCode==32)keydownspace = a | |
| if(e.keyCode==38)keydownup = a | |
| if(e.keyCode==40)keydowndown = a | |
| } | |
| function collides(a,b){ | |
| return a.x<b.x+b.width&& | |
| a.x+a.width>b.x&& | |
| a.y<b.y+b.height&& | |
| a.y+a.height>b.y | |
| } | |
| function terraincheck(a,b){ | |
| var pix = canvas.getImageData(a+15,b,1,1).data | |
| return pix[1]<20 | |
| } | |
| var playerimg = new Image | |
| playerimg.src = 'images/playerr.png' | |
| var levelimg = new Image | |
| levelimg.src = 'images/level.png' | |
| var player={ | |
| x:50, y:270, width:30, height:62, yspeed:0 | |
| ,update: function(){ | |
| if(keydownleft){ | |
| player.y-=3 | |
| if(!terraincheck(player.x-2,player.y+player.height)){player.x -= 2} | |
| if(!terraincheck(player.x-2,player.y+player.height)){player.x -= 2} | |
| playerimg.src = 'images/playerl.png' | |
| } | |
| if(keydownright){ | |
| player.y-=3 | |
| if(!terraincheck(player.x+2,player.y+player.height)){player.x += 2} | |
| if(!terraincheck(player.x+2,player.y+player.height)){player.x += 2} | |
| playerimg.src = 'images/playerr.png' | |
| } | |
| if(keydownup&&terraincheck(player.x,player.y+player.height+5)&&!terraincheck(player.x+15,player.y)&&!terraincheck(player.x-15,player.y))player.yspeed=-6 | |
| player.y += player.yspeed | |
| terraincheck(player.x,player.y+player.height)?player.yspeed=0:player.yspeed += 1; | |
| player.x = min(max(player.x,0),CANVAS_WIDTH-player.width) | |
| player.y = min(max(player.y,0),CANVAS_HEIGHT-player.height) | |
| canvas.drawImage(playerimg,player.x,player.y) | |
| } | |
| } | |
| function update(){ | |
| //clear the canvas | |
| canvas.clearRect(0,0,CANVAS_WIDTH,CANVAS_HEIGHT) | |
| canvas.drawImage(levelimg,0,0) | |
| player.update() | |
| } | |
| var canvasElement = document.createElement("canvas") | |
| canvasElement.width=CANVAS_WIDTH | |
| canvasElement.height=CANVAS_HEIGHT | |
| var canvas = canvasElement.getContext("2d") | |
| document.body.appendChild(canvasElement) | |
| setInterval(update,1e3/FPS) | |
| </script> |
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A simple fiddle would be nice!