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rain4.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>那些年下过的大雨</title>
<meta id="viewport" name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=no">
<link rel="stylesheet" href="lib/font/stylesheet.css">
<style>
html,body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
.container{
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<a class="back" href="javascript:history.go(-1);">back</a>
<div id="jsi-rain-container" class="container"></div>
<script src="https://cdn.bootcss.com/jquery/2.2.1/jquery.slim.min.js"></script>
<script>
var RENDERER = {
INIT_RAIN_DROP_COUNT : 1500,
RAIN_DROP_COUNT : 8,
HUMAN_COUNT : 30,
COLOR : 'hsl(%hue, 20%, %luminance%)',
HUE_OFFSET : Math.PI / 1000,
LUMINANCE_OFFSET : Math.PI / 1500,
init : function(){
this.setParameters();
this.reconstructMethod();
this.createRainDrops(this.INIT_RAIN_DROP_COUNT, true);
this.createHumans();
this.render();
},
setParameters : function(){
this.$container = $('#jsi-rain-container');
this.width = this.$container.width();
this.height = this.$container.height();
this.context = $('<canvas />').attr({width : this.width, height : this.height}).appendTo(this.$container).get(0).getContext('2d');
this.rainDrops = [];
this.humans = [];
this.theta = 0;
this.phi = 0;
},
reconstructMethod : function(){
this.render = this.render.bind(this);
},
getRandomValue : function(range){
return range.min + (range.max - range.min) * Math.random();
},
createRainDrops : function(count, toInit){
for(var i = 0; i < count; i++){
this.rainDrops.push(new RAIN_DROP(this.width, this.height, toInit, this));
}
},
createHumans : function(){
for(var i = 0, length = this.HUMAN_COUNT; i < length; i++) {
this.humans.push(new HUMAN(this.width, this.height, this));
}
},
render : function(){
requestAnimationFrame(this.render);
this.color = this.COLOR.replace('%hue', 205 + 5 * Math.sin(this.phi));
this.context.fillStyle = this.color.replace('%luminance', 35 + 5 * Math.sin(this.theta));
this.context.fillRect(0, 0, this.width, this.height);
for(var i = this.rainDrops.length - 1; i >= 0; i--){
if(!this.rainDrops[i].render(this.context, false)){
this.rainDrops.splice(i, 1);
}
}
this.humans.sort(function(human1, human2){
return human1 - human2;
});
for(var i = 0, length = this.humans.length; i < length; i++){
this.humans[i].renderShadow(this.context);
}
for(var i = 0, length = this.humans.length; i < length; i++){
this.humans[i].renderSubstance(this.context);
}
for(var i = this.rainDrops.length - 1; i >= 0; i--){
if(!this.rainDrops[i].render(this.context, true)){
this.rainDrops.splice(i, 1);
}
}
this.createRainDrops(this.RAIN_DROP_COUNT, false);
this.theta += this.LUMINANCE_OFFSET;
this.theta %= Math.PI * 2;
this.phi += this.HUE_OFFSET;
this.phi %= Math.PI * 2;
}
};
var RAIN_DROP = function(width, height, toInit, renderer){
this.width = width;
this.height = height;
this.toInit = toInit;
this.renderer = renderer;
this.init();
};
RAIN_DROP.prototype = {
SCALE_RANGE : {min : 0.2, max : 1}, // 缩放比例
VELOCITY_RANGE : {min : -1.5, max : -1}, // 水平速度范围
VELOCITY_RATE : 3, // 垂直速度基值
LENGTH_RATE : 20, // 雨滴长度
ACCELARATION_RATE : 0.01, // 加速度比例
VERTICAL_OFFSET_RATE : 0.04, // 垂直偏移量
FRONT_THRESHOLD : 0.8, // 前景临界值（前面的雨滴不至于过小，后面的雨滴不至于过大）
REFLECTION_RADIUS_RATE : 0.02, // 雨滴水花半径基值
COLOR : 'rgba(255, 255, 255, 0.5)', // 雨滴颜色
RADIUS_RATE : 0.2, // 用于设置全局透明度
THRESHOLD_RATE : 0.6,
init : function(){
// 获取随机缩放比例
this.scale = this.renderer.getRandomValue(this.SCALE_RANGE);
// 雨滴长度
this.length = this.LENGTH_RATE * this.scale;
// 雨滴水平方向速度
this.vx = this.renderer.getRandomValue(this.VELOCITY_RANGE) * this.scale;
// 雨滴垂直方向速度
this.vy = this.VELOCITY_RATE * this.scale;
// 雨滴垂直方向加速度
this.ay = this.ACCELARATION_RATE * this.scale;
// 角度
this.theta = Math.atan2(this.vy, this.vx);
// 用于计算垂直方向是否出边界的偏移量
this.offset = this.height * this.VERTICAL_OFFSET_RATE;
// 雨滴水平坐标值
this.x = this.renderer.getRandomValue({min : 0, max : this.width - this.height * Math.cos(this.theta)});
// 雨滴垂直坐标值
this.y = (this.toInit ? this.renderer.getRandomValue({min : 0, max : this.height}) : 0) - this.offset;
// 水花半径
this.radius = this.length * this.REFLECTION_RADIUS_RATE;
},
render : function(context, toFront){
// 如果雨滴在前面，但是缩放比例小于规定临界值，则去掉雨滴
// 如果雨滴在后面，但是缩放比例大于规定临界值，则去掉雨滴
// 保证了在背景前面的雨滴不至于太小，在背景靠后的雨滴不至于太大
if(toFront && this.scale < this.FRONT_THRESHOLD || !toFront && this.scale >= this.FRONT_THRESHOLD){
return true;
}
context.save();
context.strokeStyle = this.COLOR;
// 如果雨滴的垂直方向坐标大于了临界值，则以水花的形式展示
// 否则以雨滴下落的方式展示
if(this.y >= this.height * (1 - (1 - this.scale) * this.THRESHOLD_RATE) - this.offset){
context.lineWidth = 3;
context.globalAlpha = (1 - this.radius / this.length / this.RADIUS_RATE) * 0.5;
context.beginPath();
context.arc(this.x, this.y, this.radius, Math.PI, Math.PI * 2, false);
context.stroke();
context.restore();
this.radius *= 1.05;
if(this.radius > this.length * this.RADIUS_RATE){
return false;
}
}else{
context.lineWidth = 1;
context.beginPath();
context.moveTo(this.x, this.y);
context.lineTo(this.x + this.length * Math.cos(this.theta), this.y + this.length * Math.sin(this.theta));
context.stroke();
context.restore();
// 通过水平速度改变水平位移
this.x += this.vx;
// 通过垂直速度改变垂直位移
this.y += this.vy;
// 通过加速度，增加垂直方向的速度
// 因此雨滴并不是沿着直线运动，而是有一定的弧度
this.vy += this.ay;
}
return true;
}
};
var HUMAN = function(width, height, renderer){
this.width = width;
this.height = height;
this.renderer = renderer;
this.init();
};
HUMAN.prototype = {
HORIZONTAL_OFFSET : 30,
VERTICAL_OFFSET_RATE_RANGE : {min : 0.05, max : 0.45},
VELOCITY_OFFSET : {min : 0.3, max : 0.6},
SHADOW_SCALE : -0.6,
init : function(){
this.setParameters(true);
},
setParameters : function(toInit){
this.direction = (Math.random() < 0.5) ? 1 : -1;
if(toInit){
this.x = this.renderer.getRandomValue({min : 0, max : this.width});
}else{
this.x = (this.direction > 0) ? -this.HORIZONTAL_OFFSET : (this.width + this.HORIZONTAL_OFFSET);
}
var position = this.renderer.getRandomValue(this.VERTICAL_OFFSET_RATE_RANGE) * this.height,
verticalPosition = this.height * this.VERTICAL_OFFSET_RATE_RANGE.max;
this.rate = 10 * (verticalPosition - position) / verticalPosition | 0;
this.y = this.height - position;
this.vx = this.renderer.getRandomValue(this.VELOCITY_OFFSET) * this.direction;
this.vxRate = (0.5 + 0.5 * (verticalPosition - position) / verticalPosition);
this.theta = 0;
},
renderSubstance : function(context){
context.save();
context.translate(this.x, this.y);
context.scale(this.direction * this.vxRate, 1 * this.vxRate);
this.renderHuman(context, 30);
context.restore();
this.theta += this.vx / 5;
this.theta %= Math.PI * 2;
this.x += this.vx * this.vxRate;
if(this.x < -this.HORIZONTAL_OFFSET && this.direction < 0 || this.x > this.width + this.HORIZONTAL_OFFSET && this.direction > 0){
this.setParameters(false);
}
},
renderShadow : function(context){
context.save();
context.translate(this.x, this.y);
context.scale(this.direction * this.vxRate, this.SHADOW_SCALE * this.vxRate);
this.renderHuman(context, 35);
context.restore();
},
renderHuman : function(context, baseColor){
var color = this.renderer.color.replace('%luminance', baseColor - this.rate);
context.fillStyle = color;
context.strokeStyle = color;
context.lineWidth = 2;
context.beginPath();
context.moveTo(-30, -60);
context.quadraticCurveTo(-20, -75, 0, -75);
context.quadraticCurveTo(20, -75, 30, -60);
context.closePath();
context.fill();
context.beginPath();
context.moveTo(0, -80);
context.lineTo(0, -35);
context.stroke();
context.beginPath();
context.arc(-10, -55, 5, 0, Math.PI * 2, false);
context.fill();
context.beginPath();
context.moveTo(-15, -50);
context.quadraticCurveTo(-20, -40, -15, -30);
context.lineTo(-5, -30);
context.quadraticCurveTo(0, -40, -5, -50);
context.closePath();
context.fill();
for(var i = -1; i <= 1; i += 2){
context.beginPath();
context.moveTo(-13, -30);
context.lineTo(-13 + 7 * Math.sin(this.theta) * i, -5);
context.lineTo(-3 + 7 * Math.sin(this.theta) * i, -5);
context.lineTo(-7 + 7 * Math.sin(this.theta) * i, -10);
context.lineTo(-7, -30);
context.closePath();
context.fill();
}
}
};
$(function(){
RENDERER.init();
});
</script>
</body>
</html>