一個炫麗的HTML5圖像特效

2024-09-05 12:18:46

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一個炫麗的HTML5圖像特效，請在除了IE外的其它瀏覽器中測試，比如火狐、Chrome、Safari等瀏覽器，打開頁面后在文字上點擊右鍵，即可看到炫麗的效果。

<html><head><style type="text/css"> body			{				font-family: Monospace;				background-color: #222222;				margin: 0px;				overflow: hidden;			}		</style> 			<script type="text/javascript">			var g;				var canvas;			var width = window.innerWidth ;			var height =  window.innerHeight ;			var windowHalfX = window.innerWidth / 2;			var windowHalfY = window.innerHeight / 2;			var mouseX = 0;			var mouseY = 0;				var pmouseX = 0;			var pmouseY = 0;			var mousePressed = false;			var drawRate = 6;			var frameCount = 0;						var PI = Math.PI;			var TWO_PI = 2*Math.PI;			var HALF_PI = Math.PI*0.5;						function init(){				canvas = document.getElementById('canvas');							canvas.width = width;								canvas.height = height;													g = canvas.getContext('2d');						g.setTransform(1, 0, 0, 1, 0,0);							    document.addEventListener('mousemove', onDocumentMouseMove, false);											    document.addEventListener('mousedown', onDocumentMouseDown, false);			    document.addEventListener('mouseup', onDocumentMouseUp, false);			       			    document.addEventListener('keydown', onDocumentKeyDown, false);			    			    setup();				drawInternal();						}						function windowResize(){//				width = window.innerWidth ;//				height = window.innerHeight ;				//				canvas.width = width;//				canvas.height = height;				g.setTransform(1, 0, 0, 1, 0,0);							}						function onDocumentMouseMove(event) {			    mouseX = event.clientX - canvas.offsetLeft;			    mouseY = event.clientY - canvas.offsetTop;					    			}								function onDocumentMouseDown(event) {			    mousePressed = true;					    mousePressedEvent();			}										function onDocumentMouseUp(event) {			    mousePressed = false;						}								function onDocumentKeyDown(event){				//setup();			}						function drawInternal(){								draw();				setTimeout('drawInternal()', drawRate);							pmouseX = mouseX;				pmouseY = mouseY;						frameCount++;			}						function clear(){				g.clearRect(0,0,width,height);						}						function line(x1, y1, x2, y2){				g.beginPath();				g.moveTo(x1,y1);				g.lineTo(x2,y2);				g.closePath();				g.stroke();			}						function fillStrokeCircle(x,y,radius){				if(radius<=0)					radius = 0;				g.beginPath();									g.arc(x, y, radius, 0, TWO_PI, true);				g.closePath();				g.fill();					g.stroke();			}						function fillCircle(x, y, radius){				if(radius<=0)					radius = 0;				g.beginPath();									g.arc(x, y, radius, 0, TWO_PI, true);				g.closePath();								g.fill();							}						function strokeCircle(x, y, radius){				if(radius<=0)					radius = 0;				g.beginPath();									g.arc(x,y, radius, 0, TWO_PI, true);				g.stroke();										}						function dist(ax, ay, bx, by) {				var dx = bx - ax;				dy = by - ay;				return Math.sqrt(dx * dx + dy * dy + dz * dz);			}											var currentRandom = Math.random;						// Pseudo-random generator			function Marsaglia(i1, i2) {			  // from http://www.math.uni-bielefeld.de/~sillke/ALGORITHMS/random/marsaglia-c			  var z=i1 || 362436069, w= i2 || 521288629;			  var nextInt = function() {				z=(36969*(z&65535)+(z>>>16)) & 0xFFFFFFFF;				w=(18000*(w&65535)+(w>>>16)) & 0xFFFFFFFF;				return (((z&0xFFFF)<<16) | (w&0xFFFF)) & 0xFFFFFFFF;			  };			 			  this.nextDouble = function() {				var i = nextInt() / 4294967296;				return i < 0 ? 1 + i : i;			  };			  this.nextInt = nextInt;			}			Marsaglia.createRandomized = function() {			  var now = new Date();			  return new Marsaglia((now / 60000) & 0xFFFFFFFF, now & 0xFFFFFFFF);			};					function PerlinNoise(seed) {			  var rnd = seed !== undefined ? new Marsaglia(seed) : Marsaglia.createRandomized();			  var i, j;			  var p = new Array(512); 			  for(i=0;i<256;++i) { p[i] = i; }			  for(i=0;i<256;++i) { var t = p[j = rnd.nextInt() & 0xFF]; p[j] = p[i]; p[i] = t; }			  // copy to avoid taking mod in p[0];			  for(i=0;i<256;++i) { p[i + 256] = p[i]; } 			  function grad3d(i,x,y,z) {        				var h = i & 15; // convert into 12 gradient directions				var u = h<8 ? x : y,                 					v = h<4 ? y : h===12||h===14 ? x : z;				return ((h&1) === 0 ? u : -u) + ((h&2) === 0 ? v : -v);			  }					  function grad2d(i,x,y) { 				var v = (i & 1) === 0 ? x : y;				return (i&2) === 0 ? -v : v;			  }			  			  function grad1d(i,x) { 				return (i&1) === 0 ? -x : x;			  }			  			  function lerp(t,a,b) { return a + t * (b - a); }							  this.noise3d = function(x, y, z) {				var X = Math.floor(x)&255, Y = Math.floor(y)&255, Z = Math.floor(z)&255;				x -= Math.floor(x); y -= Math.floor(y); z -= Math.floor(z);				var fx = (3-2*x)*x*x, fy = (3-2*y)*y*y, fz = (3-2*z)*z*z;				var p0 = p[X]+Y, p00 = p[p0] + Z, p01 = p[p0 + 1] + Z, p1  = p[X + 1] + Y, p10 = p[p1] + Z, p11 = p[p1 + 1] + Z;				return lerp(fz, 				  lerp(fy, lerp(fx, grad3d(p[p00], x, y, z), grad3d(p[p10], x-1, y, z)),						   lerp(fx, grad3d(p[p01], x, y-1, z), grad3d(p[p11], x-1, y-1,z))),				  lerp(fy, lerp(fx, grad3d(p[p00 + 1], x, y, z-1), grad3d(p[p10 + 1], x-1, y, z-1)),						   lerp(fx, grad3d(p[p01 + 1], x, y-1, z-1), grad3d(p[p11 + 1], x-1, y-1,z-1))));			  };			  			  this.noise2d = function(x, y) {				var X = Math.floor(x)&255, Y = Math.floor(y)&255;				x -= Math.floor(x); y -= Math.floor(y);				var fx = (3-2*x)*x*x, fy = (3-2*y)*y*y;				var p0 = p[X]+Y, p1  = p[X + 1] + Y;				return lerp(fy, 				  lerp(fx, grad2d(p[p0], x, y), grad2d(p[p1], x-1, y)),				  lerp(fx, grad2d(p[p0 + 1], x, y-1), grad2d(p[p1 + 1], x-1, y-1)));			  };					  this.noise1d = function(x) {				var X = Math.floor(x)&255;				x -= Math.floor(x);				var fx = (3-2*x)*x*x;				return lerp(fx, grad1d(p[X], x), grad1d(p[X+1], x-1));			  };			}						//	these are lifted from Processing.js			// processing defaults			var noiseProfile = { generator: undefined, octaves: 4, fallout: 0.5, seed: undefined};					function noise(x, y, z) {			  if(noiseProfile.generator === undefined) {				// caching				noiseProfile.generator = new PerlinNoise(noiseProfile.seed);			  }			  var generator = noiseProfile.generator;			  var effect = 1, k = 1, sum = 0;			  for(var i=0; i<noiseProfile.octaves; ++i) {				effect *= noiseProfile.fallout;        				switch (arguments.length) {				case 1:				  sum += effect * (1 + generator.noise1d(k*x))/2; break;				case 2:				  sum += effect * (1 + generator.noise2d(k*x, k*y))/2; break;				case 3:				  sum += effect * (1 + generator.noise3d(k*x, k*y, k*z))/2; break;				}				k *= 2;			  }			  return sum;			};														function Worm(x,y){				this.x = x;				this.y = y;				this.lx = x;				this.ly = y;				this.heading = Math.sin(frameCount*0.083) * PI;;				this.rotation = Math.random() * (PI / (Math.random() * 70));				this.rate = 0;				this.maxLength = 15 + (noise(frameCount * 0.0025, frameCount*0.1) * 15);				this.detail = 2;				this.thickness = 3;				this.thicknessTarget = 5 + Math.random() * 10;								var cIndex = parseInt( Math.random() * colors.length );				this.c = colors[cIndex];				this.life = 30 + Math.random() * 120;				this.segments = new Array();				this.ooo = true;				this.counter = noise(frameCount * 0.1, frameCount*.1);											this.update = function(){					this.life--;					if(this.life > 0){						this.thickness += (this.thicknessTarget-this.thickness) * 0.1;						this.thickness += 0.1;						if(this.thickness > this.thicknessTarget)							this.thickness = this.thicknessTarget;						this.heading += this.rotation;						this.rate = Math.cos( this.counter / 200.0) * (10 + noise(frameCount*0.05) * 10);						this.rotation = Math.sin(this.counter/this.rate) * (this.segments.length+1) * 0.010;						this.counter++;												var speedMod = (this.segments.length * this.segments.length * this.segments.length) * 0.0015 * this.thickness / this.thicknessTarget;						var totalSpeed = (this.detail + speedMod);						var nx = Math.cos(this.heading) * totalSpeed;						var ny = Math.sin(this.heading) * totalSpeed;						this.walk(nx,ny);					}					else{						if(this.segments.length > 1){							this.segments.pop();						}						else{							this.thickness*=0.95;							this.thickness-=0.2;							if(this.thickness<0.1)								this.ooo = true;							return;						}					}										this.ooo = true;					for(var i=0; i<this.segments.length; i++){						var segment = this.segments[i];						if(segment.ooo() == false){							this.ooo = false;							break;						}					}													}								this.walk = function(nx,ny){					this.lx = this.x;					this.ly = this.y;					this.x += nx;					this.y += ny;					var newSegment = new Segment(this.lx,this.ly,this.x,this.y,this.thickness);					this.segments.unshift(newSegment);										if(this.segments.length > 1)						this.segments[this.segments.length-1].smoothAgainst(this.segments[this.segments.length-2]);										if(this.segments.length >= this.maxLength){						this.segments.pop();					}									}			}						function Segment(x1,y1,x2,y2,thickness){				this.x1 = x1;				this.y1 = y1;				this.x2 = x2;				this.y2 = y2;				this.thickness = thickness;								var angle = Math.atan2(y2-y1,x2-x1);								this.lAngle = angle - HALF_PI;				var lDeltaX = Math.cos(this.lAngle) * thickness;				var lDeltaY = Math.sin(this.lAngle) * thickness;				this.leftX1 = x1 + lDeltaX;				this.leftY1 = y1 + lDeltaY;				this.leftX2 = x2 + lDeltaX;				this.leftY2 = y2 + lDeltaY;								this.rAngle = angle + HALF_PI;				var rDeltaX = Math.cos(this.rAngle) * thickness;				var rDeltaY = Math.sin(this.rAngle) * thickness;				this.rightX1 = x1 + rDeltaX;				this.rightY1 = y1 + rDeltaY;				this.rightX2 = x2 + rDeltaX;				this.rightY2 = y2 + rDeltaY;								this.smoothAgainst = function(last){					this.leftX1 = last.leftX2 = (last.leftX2 + this.leftX1) * 0.5;					this.leftY1 = last.leftY2 = (last.leftY2 + this.leftY1) * 0.5;					this.rightX1 = last.rightX2 = (last.rightX2 + this.rightX1) * 0.5;					this.rightY1 = last.rightY2 = (last.rightY2 + this.rightY1) * 0.5;				}								this.ooo = function(){					if(this.x1 < 0 || this.y1 < 0 || this.x1 > width || this.y1>height ||					   this.x2 < 0 || this.y2 < 0 || this.x2 > width || this.y2>height)					  return true;					else					  return false;								}			}						var worms;			var colors = [];			colors[0] = '#2cd9fe';			colors[1] = '#2cfecf';			colors[2] = '#373fdf';			colors[3] = '#88fe1f';			colors[4] = '#48d6ff';			colors[5] = '#b3fcff';			colors[6] = '#f76cad';			colors[7] = '#505083';			colors[8] = '#113a7e';			colors[9] = '#014050';			colors[10] = '#ccf3ef';			colors[11] = '#009437';			colors[12] = '#8fb300';									function setup(){				worms = new Array();			}			function draw(){				clear();												for(var w=0; w<worms.length; w++){					var worm = worms[w];					worm.update();					g.fillStyle = worm.c;										g.lineWidth = 2;					g.strokeStyle = '#ffffff';										if(worm.segments.length>1){											g.beginPath();						g.moveTo(worm.segments[0].leftX1, worm.segments[0].leftY1);												for(var i=0; i<worm.segments.length; i++){							var segment = worm.segments[i];							g.lineTo(segment.leftX1,segment.leftY1);						}						g.lineTo(worm.segments[worm.segments.length-1].rightX1, worm.segments[worm.segments.length-1].rightY1);						for(var i=worm.segments.length-1; i>=0; i--){							var segment = worm.segments[i];							g.lineTo(segment.rightX1,segment.rightY1);						}						g.closePath();//						g.stroke();						g.fill();						g.stroke();					}												g.strokeStyle = '#ffffff';					if(worm.segments.length>=1){						var x = worm.segments[0].x1;						var y = worm.segments[0].y1;							var thickness = worm.segments[0].thickness;						if(worm.thickness<thickness)							thickness = worm.thickness;						if(thickness<=0)							thickness = 0.000001;													g.beginPath();						g.arc(x, y, thickness, worm.segments[0].lAngle, worm.segments[0].rAngle, false);						g.closePath();						//g.fill();						g.stroke();												var xEnd = worm.segments[worm.segments.length-1].x1;						var yEnd = worm.segments[worm.segments.length-1].y1;						thickness = worm.segments[worm.segments.length-1].thickness;						if(worm.thickness<thickness)							thickness = worm.thickness;												if(thickness<=0)							thickness = 0.000001;												g.beginPath();						g.arc(xEnd, yEnd, thickness, worm.segments[worm.segments.length-1].lAngle, worm.segments[worm.segments.length-1].rAngle, true);						g.closePath();						//g.fill();						g.stroke();																								thickness = worm.thickness-0.6;							if(worm.thickness<thickness)							thickness = worm.thickness;													fillCircle(worm.segments[0].x1,worm.segments[0].y1,thickness);    						thickness = worm.segments[worm.segments.length-1].thickness-0.6;													if(worm.thickness<thickness)							thickness = worm.thickness;													fillCircle(worm.segments[worm.segments.length-1].x1,worm.segments[worm.segments.length-1].y1,thickness);    																			if(worm.life>0){							g.fillStyle = "#FFFFFF";							fillCircle(worm.segments[0].x1,worm.segments[0].y1,thickness * 0.72);    						}					}									}										for(var w=0; w<worms.length; w++){					var worm = worms[w];					if(worm.ooo){						worms.splice(w,1);						w--;					}								}								if(frameCount %2 ==0 && mousePressed && worms.length < 50){					var direction = Math.atan2(pmouseY-mouseY, pmouseX-mouseX) + PI;					var newWorm = new Worm(mouseX,mouseY);					worms.push( newWorm );					if(mouseX!=pmouseX && mouseY!=pmouseY)						newWorm.heading = direction;				}							}						function mousePressedEvent(){			}								</script>			<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Lobster">		<style>		  body {			font-family: 'Lobster', serif;			font-size: 72px;			color: #FFFFFF;		  }		</style>			</head>	<body onload="init()" onresize="windowResize()">			<div style="position:relative;top:250px;z-index:1;-moz-user-select: none;-khtml-user-select: none;  					user-select: none;">			<center>					hold me			</center>		</div>		<div style="z-index:4; position:absolute; top:0; left:0">					<canvas id="canvas"></canvas>		</div>	</body></html>

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