mirror of
https://github.com/hiloteam/Hilo.git
synced 2025-12-08 20:35:59 +00:00
296 lines
8.8 KiB
JavaScript
296 lines
8.8 KiB
JavaScript
/**
|
|
* Hilo
|
|
* Copyright 2015 alibaba.com
|
|
* Licensed under the MIT License
|
|
*/
|
|
|
|
/**
|
|
* <iframe src='../../../examples/ParticleSystem.html?noHeader' width = '550' height = '400' scrolling='no'></iframe>
|
|
* <br/>
|
|
* @class 粒子系统
|
|
* @augments Container
|
|
* @module hilo/game/ParticleSystem
|
|
* @requires hilo/core/Hilo
|
|
* @requires hilo/core/Class
|
|
* @requires hilo/view/View
|
|
* @requires hilo/view/Container
|
|
* @requires hilo/view/Bitmap
|
|
* @requires hilo/view/Drawable
|
|
* @property {Number} emitTime 发射间隔
|
|
* @property {Number} emitTimeVar 发射间隔变化量
|
|
* @property {Number} emitNum 每次发射数量变化量
|
|
* @property {Number} emitNumVar 每次发射数量
|
|
* @property {Number} emitterX 发射器位置x
|
|
* @property {Number} emitterY 发射器位置y
|
|
* @property {Number} totalTime 总时间
|
|
* @property {Number} gx 重力加速度x
|
|
* @property {Number} gy 重力加速度y
|
|
* @param {Object} properties 创建对象的属性参数。可包含此类所有可写属性。
|
|
* @param {Object} properties.particle 粒子属性配置
|
|
* @param {Number} properties.particle.x x位置
|
|
* @param {Number} properties.particle.y y位置
|
|
* @param {Number} properties.particle.vx x速度
|
|
* @param {Number} properties.particle.vy y速度
|
|
* @param {Number} properties.particle.ax x加速度
|
|
* @param {Number} properties.particle.ay y加速度
|
|
* @param {Number} properties.particle.life 粒子存活时间 单位s
|
|
* @param {Number} properties.particle.alpha 透明度
|
|
* @param {Number} properties.particle.alphaV 透明度变化
|
|
* @param {Number} properties.particle.scale 缩放
|
|
* @param {Number} properties.particle.scaleV 缩放变化速度
|
|
*/
|
|
var ParticleSystem = (function(){
|
|
//粒子属性
|
|
var props = ['x', 'y', 'vx', 'vy', 'ax', 'ay', 'rotation', 'rotationV', 'scale', 'scaleV', 'alpha', 'alphaV', 'life'];
|
|
var PROPS = [];
|
|
for(var i = 0, l = props.length;i < l;i ++){
|
|
var p = props[i];
|
|
PROPS.push(p);
|
|
PROPS.push(p + "Var");
|
|
}
|
|
|
|
//粒子默认值
|
|
var PROPS_DEFAULT = {
|
|
x: 0,
|
|
y: 0,
|
|
vx: 0,
|
|
vy: 0,
|
|
ax: 0,
|
|
ay: 0,
|
|
scale:1,
|
|
scaleV:0,
|
|
alpha:1,
|
|
alphaV:0,
|
|
rotation: 0,
|
|
rotationV: 0,
|
|
life: 1
|
|
};
|
|
|
|
var diedParticles = [];
|
|
|
|
var ParticleSystem = Class.create(/** @lends ParticleSystem.prototype */{
|
|
Extends:Container,
|
|
constructor:function ParticleSystem(properties){
|
|
this.id = this.id || properties.id || Hilo.getUid("ParticleSystem");
|
|
|
|
this.emitterX = 0;
|
|
this.emitterY = 0;
|
|
|
|
this.gx = 0;
|
|
this.gy = 0;
|
|
this.totalTime = Infinity;
|
|
|
|
this.emitNum = 10;
|
|
this.emitNumVar = 0;
|
|
|
|
this.emitTime = .2;
|
|
this.emitTimeVar = 0;
|
|
|
|
this.particle = {};
|
|
|
|
ParticleSystem.superclass.constructor.call(this, properties);
|
|
|
|
this.reset(properties);
|
|
},
|
|
Statics:{
|
|
PROPS:PROPS,
|
|
PROPS_DEFAULT:PROPS_DEFAULT,
|
|
diedParticles:diedParticles
|
|
},
|
|
/**
|
|
* 重置属性
|
|
* @param {Object} cfg
|
|
*/
|
|
reset: function(cfg) {
|
|
Hilo.copy(this, cfg);
|
|
this.particle.system = this;
|
|
if(this.totalTime <= 0){
|
|
this.totalTime = Infinity;
|
|
}
|
|
},
|
|
/**
|
|
* 更新
|
|
* @param {Number} dt 间隔时间 单位ms
|
|
*/
|
|
onUpdate: function(dt) {
|
|
dt *= .001;
|
|
if (this._isRun) {
|
|
this._totalRunTime += dt;
|
|
this._currentRunTime += dt;
|
|
if (this._currentRunTime >= this._emitTime) {
|
|
this._currentRunTime = 0;
|
|
this._emitTime = getRandomValue(this.emitTime, this.emitTimeVar);
|
|
this._emit();
|
|
}
|
|
|
|
if (this._totalRunTime >= this.totalTime) {
|
|
this.stop();
|
|
}
|
|
}
|
|
},
|
|
/**
|
|
* 发射粒子
|
|
*/
|
|
_emit: function() {
|
|
var num = getRandomValue(this.emitNum, this.emitNumVar)>>0;
|
|
for (var i = 0; i < num; i++) {
|
|
this.addChild(Particle.create(this.particle));
|
|
}
|
|
},
|
|
/**
|
|
* 开始发射粒子
|
|
*/
|
|
start: function() {
|
|
this.stop(true);
|
|
this._currentRunTime = 0;
|
|
this._totalRunTime = 0;
|
|
this._isRun = true;
|
|
this._emitTime = getRandomValue(this.emitTime, this.emitTimeVar);
|
|
},
|
|
/**
|
|
* 停止发射粒子
|
|
* @param {Boolean} clear 是否清除所有粒子
|
|
*/
|
|
stop: function(clear) {
|
|
this._isRun = false;
|
|
if (clear) {
|
|
for (var i = this.children.length - 1; i >= 0; i--) {
|
|
this.children[i].destroy();
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* @class 粒子
|
|
* @inner
|
|
* @param {Number} vx x速度
|
|
* @param {Number} vy y速度
|
|
* @param {Number} ax x加速度
|
|
* @param {Number} ay y加速度
|
|
* @param {Number} scaleV 缩放变化速度
|
|
* @param {Number} alphaV 透明度变换速度
|
|
* @param {Number} rotationV 旋转速度
|
|
* @param {Number} life 存活时间
|
|
*/
|
|
var Particle = Class.create({
|
|
Extends:View,
|
|
constructor:function Particle(properties){
|
|
this.id = this.id || properties.id || Hilo.getUid("Particle");
|
|
Particle.superclass.constructor.call(this, properties);
|
|
this.init(properties);
|
|
},
|
|
/**
|
|
* 更新粒子。
|
|
*/
|
|
onUpdate: function(dt) {
|
|
dt *= .001;
|
|
if(this._died){
|
|
return false;
|
|
}
|
|
var ax = this.ax + this.system.gx;
|
|
var ay = this.ay + this.system.gy;
|
|
|
|
this.vx += ax * dt;
|
|
this.vy += ay * dt;
|
|
this.x += this.vx * dt;
|
|
this.y += this.vy * dt;
|
|
|
|
this.rotation += this.rotationV;
|
|
|
|
if (this._time > .1) {
|
|
this.alpha += this.alphaV;
|
|
}
|
|
|
|
this.scale += this.scaleV;
|
|
this.scaleX = this.scaleY = this.scale;
|
|
|
|
this._time += dt;
|
|
if (this._time >= this.life || this.alpha <= 0) {
|
|
this.destroy();
|
|
return false;
|
|
}
|
|
},
|
|
/**
|
|
* 设置粒子图像。
|
|
*/
|
|
setImage: function(img, frame) {
|
|
this.drawable = this.drawable||new Drawable();
|
|
frame = frame || [0, 0, img.width, img.height];
|
|
|
|
this.width = frame[2];
|
|
this.height = frame[3];
|
|
this.drawable.rect = frame;
|
|
this.drawable.image = img;
|
|
},
|
|
/**
|
|
* 销毁粒子
|
|
*/
|
|
destroy: function() {
|
|
this._died = true;
|
|
this.alpha = 0;
|
|
this.removeFromParent();
|
|
diedParticles.push(this);
|
|
},
|
|
/**
|
|
* 初始化粒子。
|
|
*/
|
|
init: function(cfg) {
|
|
this.system = cfg.system;
|
|
this._died = false;
|
|
this._time = 0;
|
|
this.alpha = 1;
|
|
for (var i = 0, l = PROPS.length; i < l; i++) {
|
|
var p = PROPS[i];
|
|
var v = cfg[p] === undefined ? PROPS_DEFAULT[p] : cfg[p];
|
|
this[p] = getRandomValue(v, cfg[p + 'Var']);
|
|
}
|
|
|
|
this.x += this.system.emitterX;
|
|
this.y += this.system.emitterY;
|
|
|
|
if (cfg.image) {
|
|
var frame = cfg.frame;
|
|
if(frame && frame[0].length){
|
|
frame = frame[(Math.random() * frame.length) >> 0];
|
|
}
|
|
this.setImage(cfg.image, frame);
|
|
if(cfg.pivotX !== undefined){
|
|
this.pivotX = cfg.pivotX * frame[2];
|
|
}
|
|
if(cfg.pivotY !== undefined){
|
|
this.pivotY = cfg.pivotY * frame[3];
|
|
}
|
|
}
|
|
},
|
|
Statics:{
|
|
/**
|
|
* 生成粒子。
|
|
* @param {Object} cfg 粒子参数。
|
|
*/
|
|
create:function(cfg) {
|
|
if (diedParticles.length > 0) {
|
|
var particle = diedParticles.pop();
|
|
particle.init(cfg);
|
|
return particle;
|
|
} else {
|
|
return new Particle(cfg);
|
|
}
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* Get the random value.
|
|
* @private
|
|
* @param {Number} value The value.
|
|
* @param {Number} variances The variances.
|
|
* @return {Number}
|
|
*/
|
|
function getRandomValue(value, variances){
|
|
return variances ? value + (Math.random() - .5) * 2 * variances : value;
|
|
}
|
|
|
|
return ParticleSystem;
|
|
})(); |