Created
April 19, 2018 02:00
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| <html> | |
| <head> | |
| <script src="jsKart.js"></script> | |
| </head> | |
| <body onload="Init()"> | |
| <center> | |
| <canvas id="screen" width="640" height="480" style="border:solid 1px;"></canvas><br> | |
| <canvas id="track" width="1448" height="1448" style="display: none;"></canvas><br> | |
| </center> | |
| </body> | |
| </html> |
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| var screenCanvas, trackCanvas; | |
| var screenContext, trackContext; | |
| var trackImage; | |
| var ready; | |
| var cameraAngle; | |
| var cameraX, cameraY, cameraZ; | |
| var pressed = {}; | |
| function KeyDownEvent(event) | |
| { | |
| pressed[event.keyCode] = true; | |
| } | |
| function KeyUpEvent(event) | |
| { | |
| pressed[event.keyCode] = false; | |
| } | |
| function Init() | |
| { | |
| screenCanvas = document.getElementById("screen"); | |
| trackCanvas = document.getElementById("track"); | |
| screenContext = screenCanvas.getContext("2d"); | |
| trackContext = trackCanvas.getContext("2d"); | |
| ready = false; | |
| trackImage = new Image; | |
| trackImage.onload = new function() | |
| { | |
| ready = true; | |
| } | |
| trackImage.src = "track.png"; | |
| while(!ready) continue; | |
| cameraAngle = 0; | |
| cameraX = 512; | |
| cameraY = 512; | |
| window.addEventListener("keydown", function(event){KeyDownEvent(event)}); | |
| window.addEventListener("keyup", function(event){KeyUpEvent(event)}); | |
| DoFrame(); | |
| } | |
| function DoFrame() | |
| { | |
| if(pressed[37]) | |
| { | |
| cameraAngle -= 0.0785398163; | |
| } | |
| if(pressed[39]) | |
| { | |
| cameraAngle += 0.0785398163; | |
| } | |
| if(pressed[38]) | |
| { | |
| cameraX += Math.sin(cameraAngle); | |
| cameraY -= Math.cos(cameraAngle); | |
| } | |
| if(pressed[40]) | |
| { | |
| cameraX -= Math.sin(cameraAngle); | |
| cameraY += Math.cos(cameraAngle); | |
| } | |
| Render(); | |
| setTimeout("DoFrame()", 1000.0 / 90.0); | |
| } | |
| function Render() | |
| { | |
| trackContext.save(); | |
| trackContext.translate(724, 1448); | |
| trackContext.rotate(-cameraAngle); | |
| trackContext.translate(-cameraX, -cameraY); | |
| trackContext.drawImage(trackImage, 0, 0, 1024, 1024, 0, 0, 1024, 1024); | |
| trackContext.restore(); | |
| var trackWidth = 1; | |
| var iVRes = 1; | |
| for(var screenY = 250; screenY < 480; screenY += iVRes) | |
| { | |
| var z = (240 / (screenY - 240)) * 10; | |
| trackWidth = z; | |
| trackY = 1448 - z; | |
| if(trackY > 0) screenContext.drawImage(trackCanvas, 724 - (trackWidth / 2), trackY, trackWidth, 1, 0, screenY, 640, iVRes); | |
| } | |
| } |
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