Разработка Фонтан иллюминация

var RENDERER = {
    GRAVITY : 0.08,
    BASE_RATE : 0.6,
    OFFSET_RATE : 1 / 50,
    PARTICLE_COUNT : 30,
    
    init : function(){
        this.setParameters();
        this.setup();
        this.reconstructMethods();
        this.bindEvent();
        this.render();
    },
    setParameters : function(){
        this.$window = $(window);
        this.$container = $('#jsi-fountain-container');
        this.$canvas = $('<canvas />');
        this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
        this.particles = [];
        this.fountains = [];
        this.resizeIds = [];
    },
    setup : function(){
        this.particles.length = 0;
        this.fountains.length = 0;
        this.resizeIds.length = 0;
        this.width = this.$container.width();
        this.height = this.$container.height();
        this.$canvas.attr({width : this.width, height : this.height});
        this.velocity = 1;
        
        while(true){
            var distance = 0,
                velocity = this.velocity;
                
            while(velocity >= 0){
                velocity -= this.GRAVITY;
                distance += velocity;
            }
            if(distance > Math.min(this.height * (this.BASE_RATE - this.OFFSET_RATE), 500)){
                this.velocity -= 0.2;
                break;
            }
            this.velocity += 0.2;
        }
        this.gradient = this.context.createLinearGradient(0, this.height * this.BASE_RATE, 0, this.height);
        this.gradient.addColorStop(0, 'hsla(210, 80%, 5%, 0.5)');
        this.gradient.addColorStop(0.1, 'hsla(210, 80%, 5%, 0.8)');
        this.gradient.addColorStop(1, 'hsla(210, 80%, 5%, 0.9)');
        this.createElements();
    },
    createElements : function(){
        for(var i = 0, count = this.PARTICLE_COUNT * this.width / 500  * this.height / 500; i < count; i++){
            this.particles.push(new PARTICLE(this));
        }
        for(var i = -2; i <= 2; i++){
            this.fountains.push(new FOUNTAIN(this, this.width / 2 + i * Math.max(250, this.width / 5), this.height * (this.BASE_RATE - this.OFFSET_RATE), i));
        }
    },
    watchWindowSize : function(){
        while(this.resizeIds.length > 0){
            clearTimeout(this.resizeIds.pop());
        }
        this.tmpWidth = this.$window.width();
        this.tmpHeight = this.$window.height();
        this.resizeIds.push(setTimeout(this.jdugeToStopResize, this.RESIZE_INTERVAL));
    },
    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();
        }
    },
    reconstructMethods : function(){
        this.watchWindowSize = this.watchWindowSize.bind(this);
        this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
        this.render = this.render.bind(this);
    },
    bindEvent : function(){
        this.$window.on('resize', this.watchWindowSize);
    },
    getRandomValue : function(min, max){
        return min + (max - min) * Math.random();
    },
    render : function(){
        requestAnimationFrame(this.render);
        this.context.fillStyle = 'hsla(0, 0%, 0%, 0.3)';
        this.context.fillRect(0, 0, this.width, this.height);
        this.context.save();
        this.context.globalCompositeOperation = 'lighter';
        
        for(var i = 0, count = this.particles.length; i < count; i++){
            this.particles[i].render(this.context);
        }
        for(var i = 0, count = this.fountains.length; i < count; i++){
            this.fountains[i].render(this.context);
        }
        this.context.restore();
        this.context.save();
        this.context.translate(0, this.height * this.BASE_RATE);
        this.context.scale(1, -(1 - this.BASE_RATE) / this.BASE_RATE);
        this.context.drawImage(this.$canvas.get(0), 0, 0, this.width, this.height * this.BASE_RATE, 0,  -this.height * this.BASE_RATE, this.width, this.height * this.BASE_RATE);
        this.context.restore();
        this.context.fillStyle = this.gradient;
        this.context.fillRect(0, this.height * this.BASE_RATE, this.width, this.height * (1 - this.BASE_RATE));
    }
};
var PARTICLE = function(renderer){
    this.renderer = renderer;
    this.init();
};
PARTICLE.prototype = {
    THRESHOLD : 10,
    
    init : function(){
        this.x = this.renderer.getRandomValue(-this.THRESHOLD, this.renderer.width + this.THRESHOLD);
        this.y = this.renderer.getRandomValue(-this.THRESHOLD, this.renderer.height * this.renderer.BASE_RATE + this.THRESHOLD);
        this.vx = this.renderer.getRandomValue(-0.3, 0.3);
        this.vy = this.renderer.getRandomValue(-0.3, 0.3);
        this.theta = this.renderer.getRandomValue(0, Math.PI * 2);
        this.deltaTheta = this.renderer.getRandomValue(Math.PI / 300, Math.PI / 100);
    },
    getColor : function(){
        var baseIndex = -1,
            fountains = this.renderer.fountains,
            hue = 0;
            
        for(var i = 0, count = fountains.length; i < count; i++){
            if(this.x < fountains[i].x){
                break;
            }
            baseIndex = i;
        }
        if(baseIndex == -1){
            hue = fountains[0].hue;
        }else if(baseIndex == fountains.length - 1){
            hue = fountains[fountains.length - 1].hue;
        }else{
            var dx1 = this.x - fountains[baseIndex].x,
                dx2 = fountains[baseIndex + 1].x - this.x;
            hue = fountains[baseIndex].hue * (dx2 / (dx1 + dx2)) + fountains[baseIndex + 1].hue * (dx1 / (dx1 + dx2));
        }
        return 'hsl(' + hue + ', 60%, ' + (15 * (1 + Math.sin(this.theta))) + '%)';
    },
    render : function(context){
        context.save();
        context.fillStyle = this.getColor();
        context.beginPath();
        context.arc(this.x, this.y, 1, 0, Math.PI * 2, false);
        context.fill();
        context.restore();
        
        this.x += this.vx;
        this.y += this.vy;
        this.theta += this.deltaTheta;
        this.theta %= Math.PI * 2;
        
        if(this.x < -this.THRESHOLD && this.vx < 0 || this.x > this.renderer.width + this.THRESHOLD && this.vx > 0){
            this.vx *= -1;
        }
        if(this.y < -this.THRESHOLD && this.vy < 0 || this.y > this.renderer.height * this.renderer.BASE_RATE + this.THRESHOLD && this.vy > 0){
            this.vy *= -1;
        }
    }
};
var FOUNTAIN = function(renderer, x, y, index){
    this.renderer = renderer;
    this.x = x;
    this.y = y;
    this.index = index;
    this.init();
};
FOUNTAIN.prototype = {
    init : function(){
        this.waterLines = [];
        this.hue = 60;
        this.destinationHue = this.hue + 72 * this.index;
        this.waitCount = Math.abs(this.index) * 100;
        this.count = 0;
        this.theta = 0;
        this.status = 0;
    },
    controlStatus : function(){
        switch(this.status){
        case 0:
            if(++this.count >= this.waitCount){
                this.status = 1;
            }
            break;
        case 1:
            if(++this.count >= 300){
                this.status = 2;
                this.count = 0;
            }
            break;
        case 2:
            this.hue += this.index;
            
            if(this.hue == this.destinationHue){
                this.status = 3;
            }
            break;
        case 3:
            if(++this.count == 300){
                this.status = 4;
                this.count = 0;
            }
            break;
        case 4:
            this.theta += Math.PI / 50;
            this.theta %= Math.PI * 2;
            
            if(this.count++ == 25){
                this.status = 3;
            }
        }
        return this.status > 0;
    },
    render : function(context){
        var hue = this.hue + Math.sin(this.theta) * 36;
        context.save();
        context.fillStyle = 'hsl(' + hue + ', 70%, 30%)';
        context.translate(this.x, this.y);
        context.scale(1, 0.3);
        context.beginPath();
        context.arc(0, 0, 10, 0, Math.PI * 2, false);
        context.fill();
        context.restore();
        
        if(!this.controlStatus()){
            return;
        }
        context.save();
        context.translate(this.x, this.y);
        
        for(var i = this.waterLines.length - 1; i >= 0; i--){
            if(!this.waterLines[i].render(context, hue)){
                this.waterLines.splice(i, 1);
            }
        }
        context.restore();
        this.waterLines.push(new WATER_LINE(this.renderer));
    }
};
var WATER_LINE = function(renderer){
    this.renderer = renderer;
    this.init();
};
WATER_LINE.prototype = {
    MAX_TRACES : 80,
    
    init : function(){
        var theta = this.renderer.getRandomValue(-Math.PI / 20, Math.PI / 20),
            rate = this.renderer.getRandomValue(0.8, 1);
        this.x = this.renderer.getRandomValue(-2, 2);
        this.y = 0;
        this.vx = this.renderer.velocity * Math.sin(theta) * rate;
        this.vy = -this.renderer.velocity * Math.cos(theta * this.renderer.getRandomValue(3, 6)) * rate;
        this.opacity = 1;
        this.luminance = 0;
        this.traces = [];
    },
    render : function(context, hue){
        this.traces.push({x : this.x, y : this.y});
        
        if(this.traces.length > this.MAX_TRACES){
            this.traces.shift();
        }
        context.save();
        context.strokeStyle = 'hsla(' + hue + ', 70%, ' + this.luminance + '%, ' + this.opacity + ')';
        context.beginPath();
        context.moveTo(this.traces[0].x, this.traces[0].y);
        
        for(var i = 1, count = this.traces.length; i < count; i++){
            context.lineTo(this.traces[i].x, this.traces[i].y);
        }
        context.stroke();
        context.restore();
        this.x += this.vx;
        this.y += this.vy;
        this.vy += this.renderer.GRAVITY;
        
        if(this.vy > 0){
            this.opacity -= 0.02;
        }
        if(this.luminance < 10){
            this.luminance += 0.1;
        }
        return this.opacity > 0;
    }
};
$(function(){
    RENDERER.init();
});