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PO2D Raycasting in a grid-based environment
 

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  1. PO2D Raycasting in a grid-based environment
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    <p>Hello stackoverflow community. Recently, I've been working on getting a proper raycasting system working. Currently, I've been working entirely in 2D, with a 2D map and player representation. I'm having issues however properly creating a grid-based environment. I think the issue is the way I'm casting rays isn't grid-based at all. I have an example of my issue <a href="https://dl.dropboxusercontent.com/s/pshq0tqu9krnbgv/index.html" rel="nofollow">here</a>. As you can see, the rays appear choppy and malformed. Can anyone give me some insight on how a grid-based system would work? Any help is appreciated, thanks.</p> <p>Here's the full source code(I'm using PIXI.js for my rendering):</p> <pre><code>var world = [ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1], [1,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,0,1,0,0,1,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1], [1,0,1,1,1,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,1,1,1,1,1], [1,0,0,0,0,0,0,0,0,1,1,1,1,0,1,1,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1], [1,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1], [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1], [1,0,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1], [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1], [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1] ]; var width = world[0].length; var height = world.length; var scale = 8; var posX = 1; var posY = 1; var yaw = 0; var m = 0; var renderer = new PIXI.WebGLRenderer(width * scale,height * scale); //var renderer = new PIXI.WebGLRenderer(320,200); document.body.appendChild(renderer.view); var stage = new PIXI.Stage(0xFFFFFF); var graphics = new PIXI.Graphics(); stage.addChild(graphics); function drawMap() { for(var x = 0;x &lt; width;x++) { for(var y = 0;y &lt; height;y++) { if(world[y][x]) { graphics.beginFill(0xCCCCCC); graphics.drawRect(x * scale, y * scale, scale, scale); graphics.endFill(); } } } } function drawPlayer() { graphics.beginFill(0x000000); graphics.drawRect(posX * scale, posY * scale, 4, 4); graphics.endFill(); graphics.lineStyle(1,0x000000); graphics.moveTo(posX * scale + 2, posY * scale + 2); graphics.lineTo(posX * scale + Math.cos(yaw) * 20 + 2, posY * scale + Math.sin(yaw) * 20 + 2); } function move() { var newX = posX + Math.cos(yaw) * m * 0.3; var newY = posY + Math.sin(yaw) * m * 0.3; m = 0; if(isColliding(newX,newY)) { return; } posX = newX; posY = newY; } function isColliding(x,y) { if(world[Math.floor(y)][Math.floor(x)]) { return true; } return false; } function castRays() { var rayYaw = 0; var rayX = posX; var rayY = posY; var dist = 0; for(var x = -160;x &lt; 160;x++) { rayYaw = x * 0.1875; while(!isColliding(rayX,rayY)) { rayX += Math.cos((rayYaw) * (Math.PI / 180) + yaw); rayY += Math.sin((rayYaw) * (Math.PI / 180) + yaw); if(rayX &lt; 0 || rayX &gt;= width || rayY &lt; 0 || rayY &gt;= height) { break; } } dist = Math.sqrt(Math.pow(posX - rayX,2) + Math.pow(posY - rayY,2)); graphics.lineStyle(1,0x00FFCC); graphics.moveTo(posX * scale + 2, posY * scale + 2); graphics.lineTo(rayX * scale + Math.cos((rayYaw) * (Math.PI / 180)) + 2, rayY * scale + Math.sin((rayYaw) * (Math.PI / 180)) + 2); //drawLine(x + 160,dist); rayX = posX; rayY = posY; } } function drawLine(x,d) { var slice = (32 * d / 160); var start = (100 - (slice/2)); graphics.lineStyle(1,0xCCCCCC); graphics.moveTo(x,start); graphics.lineTo(x,slice); } function main() { drawMap(); move(); drawPlayer(); castRays(); renderer.render(stage); graphics.clear(); } document.onkeydown = checkKey; function checkKey(e) { e = e || window.event; if (e.keyCode == '38') { // up arrow m = 1; } else if (e.keyCode == '40') { // down arrow m = -1; } else if (e.keyCode == '37') { // left arrow yaw -= 0.1; } else if (e.keyCode == '39') { // right arrow yaw += 0.1; } } setInterval(main,1000/30); </code></pre>
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