博客美化，页脚游动的鱼
首先需要开通博客js权限
接着在博客页脚html栏添加如下代码，就OK
<div id="datouwang" class="container1"></div>
<script>
var RENDERER = {
POINT_INTERVAL : 5,
FISH_COUNT : 2,
MAX_INTERVAL_COUNT : 50,
INIT_HEIGHT_RATE : 0.5,
init : function(){
this.setParameters();
this.reconstructMethods();
this.setup();
this.bindEvent();
this.render();
},
setParameters : function(){
this.$window = $(window);
this.$container = $('#datouwang');
this.$canvas = $('<canvas />');
this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
this.points = [];
this.fishes = [];
this.watchIds = [];
},
createSurfacePoints : function(){
var count = Math.round(this.width / this.POINT_INTERVAL);
this.pointInterval = this.width / (count - 1);
this.points.push(new SURFACE_POINT(this, 0));
for(var i = 1; i < count; i++){
var point = new SURFACE_POINT(this, i * this.pointInterval),
previous = this.points[i - 1];
point.setPreviousPoint(previous);
previous.setNextPoint(point);
this.points.push(point);
}
},
reconstructMethods : function(){
this.watchWindowSize = this.watchWindowSize.bind(this);
this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
this.startEpicenter = this.startEpicenter.bind(this);
this.moveEpicenter = this.moveEpicenter.bind(this);
this.render = this.render.bind(this);
},
setup : function(){
this.points.length = 0;
this.fishes.length = 0;
this.watchIds.length = 0;
this.intervalCount = this.MAX_INTERVAL_COUNT;
this.width = this.$container.width();
this.height = this.$container.height();
this.fishCount = this.FISH_COUNT * this.width / 500 * this.height / 500;
this.$canvas.attr({width : this.width, height : this.height});
this.skyGradient = this.context.createLinearGradient(0, 0, 0, this.height);
this.skyGradient.addColorStop(0, 'hsl(180, 80%, 90%)');
this.skyGradient.addColorStop(1, 'hsl(180, 80%, 60%)');
this.seaGradient = this.context.createLinearGradient(0, 0, 0, this.height);
this.seaGradient.addColorStop(0, 'hsl(180, 80%, 60%)');
this.seaGradient.addColorStop(0.5, 'hsl(180, 80%, 50%)');
this.seaGradient.addColorStop(1, 'hsl(210, 80%, 50%)');
this.fishes.push(new FISH(this));
this.createSurfacePoints();
},
watchWindowSize : function(){
this.clearTimer();
this.tmpWidth = this.$window.width();
this.tmpHeight = this.$window.height();
this.watchIds.push(setTimeout(this.jdugeToStopResize, this.WATCH_INTERVAL));
},
clearTimer : function(){
while(this.watchIds.length > 0){
clearTimeout(this.watchIds.pop());
}
},
jdugeToStopResize : function(){
var width = this.$window.width(),
height = this.$window.height(),
stopped = (width == this.tmpWidth && height == this.tmpHeight);
this.tmpWidth = width;
this.tmpHeight = height;
if(stopped){
this.setup();
}
},
bindEvent : function(){
this.$window.on('resize', this.watchWindowSize);
this.$container.on('mouseenter', this.startEpicenter);
this.$container.on('mousemove', this.moveEpicenter);
},
getAxis : function(event){
var offset = this.$container.offset();
return {
x : event.clientX - offset.left + this.$window.scrollLeft(),
y : event.clientY - offset.top + this.$window.scrollTop()
};
},
startEpicenter : function(event){
this.axis = this.getAxis(event);
},
moveEpicenter : function(event){
var axis = this.getAxis(event);
if(!this.axis){
this.axis = axis;
}
this.points[Math.round(axis.x / this.pointInterval)].interfere(axis.y, axis.y - this.axis.y);
this.axis = axis;
},
generateEpicenter : function(x, y, prevX, prevY){
var index = Math.round(x / this.pointInterval);
if(index < 0 || index >= this.points.length){
return;
}
this.points[index].interfere(y, y - prevY);
},
render : function(){
requestAnimationFrame(this.render);
this.context.fillStyle = this.skyGradient;
this.context.fillRect(0, 0, this.width, this.height);
this.context.fillStyle = this.seaGradient;
this.context.beginPath();
this.context.moveTo(0, this.height);
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].updateSelf();
}
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].updateNeighbors();
}
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].render(this.context);
}
this.context.lineTo(this.width, this.height);
this.context.closePath();
this.context.fill();
for(var i = 0, count = this.fishes.length; i < count; i++){
this.fishes[i].render(this.context);
}
if(this.fishes.length < this.fishCount){
if(--this.intervalCount == 0){
this.intervalCount = this.MAX_INTERVAL_COUNT;
this.fishes.push(new FISH(this));
}
}
}
};
var SURFACE_POINT = function(renderer, x){
this.renderer = renderer;
this.x = x;
this.init();
};
SURFACE_POINT.prototype = {
SPRING_CONSTANT : 0.03,
SPRING_FRICTION : 0.9,
WAVE_SPREAD : 0.3,
ACCELARATION_RATE : 0.01,
init : function(){
this.initHeight = this.renderer.height * this.renderer.INIT_HEIGHT_RATE;
this.height = this.initHeight;
this.fy = 0;
this.force = {previous : 0, next : 0};
},
setPreviousPoint : function(previous){
this.previous = previous;
},
setNextPoint : function(next){
this.next = next;
},
interfere : function(y, velocity){
var offset = this.renderer.height - this.height - y;
if(offset > 0 && velocity < 0 || offset < 0 && velocity > 0){
return;
}
this.fy = this.renderer.height * this.ACCELARATION_RATE * (offset >= 0 ? -1 : 1) * Math.abs(velocity);
},
updateSelf : function(){
this.fy += this.SPRING_CONSTANT * (this.initHeight - this.height);
this.fy *= this.SPRING_FRICTION;
this.height += this.fy;
},
updateNeighbors : function(){
if(this.previous){
this.force.previous = this.WAVE_SPREAD * (this.height - this.previous.height);
}
if(this.next){
this.force.next = this.WAVE_SPREAD * (this.height - this.next.height);
}
},
render : function(context){
if(this.previous){
this.previous.height += this.force.previous;
this.previous.fy += this.force.previous;
}
if(this.next){
this.next.height += this.force.next;
this.next.fy += this.force.next;
}
context.lineTo(this.x, this.renderer.height - this.height);
}
};
var FISH = function(renderer){
this.renderer = renderer;
this.init();
};
FISH.prototype = {
LENGTH : 40,
GRAVITY : 0.4,
init : function(){
this.direction = Math.random() < 0.5;
this.x = this.direction ? (this.renderer.width + this.LENGTH) : -this.LENGTH;
this.y = this.getRandomValue(this.renderer.height * 6 / 10, this.renderer.height * 9 / 10);
this.prevX = this.x;
this.prevY = this.y;
this.vx = this.getRandomValue(4, 8) * (this.direction ? -1 : 1);
this.vy = this.getRandomValue(-5, -2);
this.ay = this.getRandomValue(-0.2, -0.05);
this.theta = 0;
this.phi = 0;
this.isOut = false;
},
getRandomValue : function(min, max){
return min + (max - min) * Math.random();
},
render : function(context){
context.save();
context.translate(this.x, this.y);
context.rotate(Math.PI + Math.atan2(this.vy, this.vx));
context.scale(1, this.direction ? 1 : -1);
context.fillStyle = 'hsl(180, 30%, 80%)';
context.beginPath();
context.moveTo(-30, 0);
context.bezierCurveTo(-20, 15, 15, 10, 40, 0);
context.bezierCurveTo(15, -10, -20, -15, -30, 0);
context.fill();
context.save();
context.translate(40, 0);
context.scale(0.9 + 0.1 * Math.sin(this.theta), 1);
context.fillStyle = 'hsl(180, 30%, 80%)';
context.beginPath();
context.moveTo(0, 0);
context.quadraticCurveTo(5, 10, 20, 8);
context.quadraticCurveTo(12, 5, 10, 0);
context.quadraticCurveTo(12, -5, 20, -8);
context.quadraticCurveTo(5, -10, 0, 0);
context.fill();
context.restore();
context.save();
context.translate(-3, 0);
context.rotate(Math.PI / 3 + Math.PI / 20 * Math.sin(this.phi));
context.fillStyle = 'hsl(220, 80%, 40%)';
context.beginPath();
context.moveTo(-5, 0);
context.bezierCurveTo(-10, -10, -10, -30, 0, -40);
context.bezierCurveTo(12, -25, 8, -10, 0, 0);
context.closePath();
context.fill();
context.restore();
context.strokeStyle = 'hsl(220, 80%, 40%)';
context.beginPath();
context.arc(-15, -3, 5, 0, Math.PI * 2, false);
context.stroke();
context.fillStyle = 'hsl(220, 80%, 40%)';
context.beginPath();
context.arc(-15, -3, 3, 0, Math.PI * 2, false);
context.fill();
context.restore();
this.prevX = this.x;
this.prevY = this.y;
this.x += this.vx;
this.y += this.vy;
this.vy += this.ay;
if(this.y < this.renderer.height * this.renderer.INIT_HEIGHT_RATE){
this.vy += this.GRAVITY;
this.isOut = true;
}else{
if(this.isOut){
this.ay = this.getRandomValue(-0.2, -0.05);
}
this.isOut = false;
}
this.theta += Math.PI / 20;
this.theta %= Math.PI * 2;
this.phi += Math.PI / 30;
this.theta %= Math.PI * 2;
if(this.y > this.renderer.height * this.renderer.INIT_HEIGHT_RATE - this.LENGTH && this.y < this.renderer.height * this.renderer.INIT_HEIGHT_RATE + this.LENGTH){
this.renderer.generateEpicenter(this.x + (this.direction ? -1 : 1) * this.LENGTH, this.y, this.prevX, this.prevY);
}
if(this.vx > 0 && this.x > this.renderer.width + this.LENGTH || this.vx < 0 && this.x < -this.LENGTH){
this.init();
}
}
};
$(function(){
RENDERER.init();
});
</script>
页面定制的CSS样式如下
.container1{
width: 100%;
height:400px;
margin: 0;
padding: 0;
background-color:#FFFFFF;
float:left;
margin-top:-400px;
opacity:0.1;
}
