TheDots/pushpull.html at master · TravCav/TheDots · GitHub

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<html>

<head>
	<style>
		body {
			background-color: #000000;
			margin: 0px;
		}

		canvas,
		img {
			image-rendering: optimizeSpeed;
			image-rendering: -moz-crisp-edges;
			image-rendering: -webkit-optimize-contrast;
			image-rendering: optimize-contrast;
			-ms-interpolation-mode: nearest-neighbor;
		}
	</style>
	<title>stuff</title>
</head>

<body>
	<canvas id="gridCanvas" width="1000" height="1000"></canvas>
	<script type="text/javascript">
	var ctx = document.getElementById('gridCanvas').getContext('2d');
		ctx.canvas.width = window.innerWidth;
		ctx.canvas.height = window.innerHeight;
		var centerX = ctx.canvas.width / 2;
		var centerY = ctx.canvas.height / 2;
		var pixels;
		var dotCount = 100;
		var friction = 1;//.025;
		var kick = 0;
		var halfKick = kick / 2;
		var gravity = 1

		function Color(r, g, b, a){
			this.r = r || 255;//Math.floor(Math.random() * 255);
			this.g = g || 255;//Math.floor(Math.random() * 255);
			this.b = b || 255;//Math.floor(Math.random() * 255);
			this.a = a || 255;
		}

		function Point(x, y){
			this.x = x || 0;
			this.y = y || 0;
		}

		function Dot(x, y, m){
			var self = this;
			self.x = x || Math.floor(Math.random() * ctx.canvas.width);
			self.y = y || Math.floor(Math.random() * ctx.canvas.height);
			self.color = new Color();

			self.vector = new Point((Math.random() *kick) - halfKick, (Math.random() * kick) - halfKick);
			self.mass =  m || 1;


			self.Bounce = function(){
					// Bounce
					var bounce = -.5
				    if (self.x > ctx.canvas.width) { self.x = ctx.canvas.width; self.vector.x *= bounce;}
				    if (self.x < 0) { self.x = 0; self.vector.x *= bounce;}
				    if (self.y > ctx.canvas.height) { self.y = ctx.canvas.height; self.vector.y *= bounce;}
				    if (self.y < 0) { self.y = 0; self.vector.y *= bounce;}
			}

			self.Bonk = function(){
					// Bonk
					 if (self.x > ctx.canvas.width) { self.x = ctx.canvas.width; self.vector.x = 0; self.vector.y = 0; }
				     if (self.x < 0) { self.x = 0; self.vector.x = 0; self.vector.y = 0; }
				     if (self.y > ctx.canvas.height) { self.y = ctx.canvas.height; self.vector.x = 0; self.vector.y = 0; }
				     if (self.y < 0) { self.y = 0; self.vector.x = 0; self.vector.y = 0; }
			}

			self.Wrap = function(){
					// wrap
					 if (self.x > ctx.canvas.width) { self.x = 0; }
					 if (self.x < 0) { self.x = ctx.canvas.width; }
					 if (self.y > ctx.canvas.height) { self.y = 0; }
					 if (self.y < 0) { self.y = ctx.canvas.height; }
			}

			self.DoMovement = function(){

				self.x += self.vector.x;
				self.y += self.vector.y;

				// "friction"
				  self.vector.x /= friction;
				  self.vector.y /= friction;

				self.Bounce();
			}
		}

		function init() {
			var vectors = [];
			for (var i = 0; i <= dotCount; i++) { vectors.push(new Dot()); }

			DrawGrid(vectors);

		}

		function DrawGrid(dots) {
		   for(var i = dotCount; i > 0; i--){ var imo = i-1;
			   for(var j=imo; j > 0; j--){
					var dx = dots[j].x - dots[i].x;
					var dy = dots[j].y - dots[i].y;
					var distance = Math.sqrt((dx*dx) + (dy * dy));
					var mag = (gravity * dots[i].mass * dots[i].mass) / (distance * distance * distance);
					if(distance > 1 ) {

						dots[i].vector.x += dx * mag * dots[j].mass;
						dots[i].vector.y += dy * mag * dots[j].mass;

						dots[j].vector.x -= dx * mag * dots[i].mass;
						dots[j].vector.y -= dy * mag * dots[i].mass;
					} else {

						dots[i].vector.x -= dx * mag * dots[j].mass;
						dots[i].vector.y -= dy * mag * dots[j].mass;

						dots[j].vector.x += dx * mag * dots[i].mass;
						dots[j].vector.y += dy * mag * dots[i].mass;
					}
				  }
			}

			for(var i = dotCount; i > 0; i--){
				dots[i].DoMovement();
			}


				// clear screen
				pixels = ctx.createImageData(ctx.canvas.width, ctx.canvas.height);

				var index = 0;
				var dot;

				// draw
				for (var i = dotCount; i > 0; i--) {
					dot = dots[i];
					var x = Math.floor(dot.x);
					var y = Math.floor(dot.y);
					index = (x + y * ctx.canvas.width) * 4;
					if (!(x < 0 || y < 0 || x > ctx.canvas.width || y > ctx.canvas.height)){
						var v = (Math.abs(dot.vector.x) + Math.abs(dot.vector.y)) * 20;
						if (v > 255) {v = 255;}
						pixels.data[index] = dot.color.r;
						pixels.data[index+1] = dot.color.g-v;
						pixels.data[index+2] = dot.color.b-v;
						pixels.data[index+3] = dot.color.a;
					}
				}

				ctx.putImageData(pixels, 0, 0);

			setTimeout(function () { DrawGrid(dots) }, 1);
			return;
		}

		init();
	</script>
</body>

</html>