426 lines
15 KiB
JavaScript
426 lines
15 KiB
JavaScript
'use strict';
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/*
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* 小型游戏引擎
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*/
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// requestAnimationFrame polyfill
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if (!Date.now)
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Date.now = function() { return new Date().getTime(); };
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(function() {
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'use strict';
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var vendors = ['webkit', 'moz'];
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for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
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var vp = vendors[i];
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window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];
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window.cancelAnimationFrame = (window[vp+'CancelAnimationFrame'] || window[vp+'CancelRequestAnimationFrame']);
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}
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if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
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|| !window.requestAnimationFrame || !window.cancelAnimationFrame) {
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var lastTime = 0;
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window.requestAnimationFrame = function(callback) {
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var now = Date.now();
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var nextTime = Math.max(lastTime + 16, now);
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return setTimeout(function() { callback(lastTime = nextTime); },
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nextTime - now);
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};
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window.cancelAnimationFrame = clearTimeout;
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}
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}());
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function Game(id,params){
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var _ = this;
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var settings = {
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width:960, //画布宽度
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height:640 //画布高度
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};
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var _extend = function(target,settings,params){
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params = params||{};
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for(var i in settings){
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target[i] = params[i]||settings[i];
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}
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return target;
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};
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_extend(_,settings,params);
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var $canvas = document.getElementById(id);
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$canvas.width = _.width;
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$canvas.height = _.height;
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var _context = $canvas.getContext('2d'); //画布上下文环境
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var _stages = []; //布景对象队列
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var _events = {}; //事件集合
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var _index=0, //当前布景索引
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_hander; //帧动画控制
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//活动对象构造
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var Item = function(params){
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this._params = params||{};
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this._id = 0; //标志符
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this._stage = null; //与所属布景绑定
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this._settings = {
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x:0, //位置坐标:横坐标
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y:0, //位置坐标:纵坐标
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width:20, //宽
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height:20, //高
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type:0, //对象类型,0表示普通对象(不与地图绑定),1表示玩家控制对象,2表示程序控制对象
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color:'#F00', //标识颜色
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status:1, //对象状态,0表示未激活/结束,1表示正常,2表示暂停,3表示临时,4表示异常
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orientation:0, //当前定位方向,0表示右,1表示下,2表示左,3表示上
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speed:0, //移动速度
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//地图相关
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location:null, //定位地图,Map对象
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coord:null, //如果对象与地图绑定,需设置地图坐标;若不绑定,则设置位置坐标
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path:[], //NPC自动行走的路径
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vector:null, //目标坐标
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//布局相关
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frames:1, //速度等级,内部计算器times多少帧变化一次
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times:0, //刷新画布计数(用于循环动画状态判断)
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timeout:0, //倒计时(用于过程动画状态判断)
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control:{}, //控制缓存,到达定位点时处理
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update:function(){}, //更新参数信息
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draw:function(){} //绘制
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};
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_extend(this,this._settings,this._params);
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};
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Item.prototype.bind = function(eventType,callback){
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if(!_events[eventType]){
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_events[eventType] = {};
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$canvas.addEventListener(eventType,function(e){
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var position = _.getPosition(e);
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_stages[_index].items.forEach(function(item){
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if(Math.abs(position.x-item.x)<item.width/2&&Math.abs(position.y-item.y)<item.height/2){
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var key = 's'+_index+'i'+item._id;
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if(_events[eventType][key]){
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_events[eventType][key](e);
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}
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}
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});
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e.preventDefault();
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});
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}
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_events[eventType]['s'+this._stage.index+'i'+this._id] = callback.bind(this); //绑定作用域
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};
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//地图对象构造器
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var Map = function(params){
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this._params = params||{};
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this._id = 0; //标志符
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this._stage = null; //与所属布景绑定
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this._settings = {
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x:0, //地图起点坐标
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y:0,
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size:20, //地图单元的宽度
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data:[], //地图数据
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x_length:0, //二维数组x轴长度
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y_length:0, //二维数组y轴长度
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frames:1, //速度等级,内部计算器times多少帧变化一次
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times:0, //刷新画布计数(用于循环动画状态判断)
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cache:false, //是否静态（如静态则设置缓存）
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update:function(){}, //更新地图数据
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draw:function(){}, //绘制地图
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};
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_extend(this,this._settings,this._params);
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};
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//获取地图上某点的值
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Map.prototype.get = function(x,y){
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if(this.data[y]&&typeof this.data[y][x]!='undefined'){
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return this.data[y][x];
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}
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return -1;
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};
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//设置地图上某点的值
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Map.prototype.set = function(x,y,value){
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if(this.data[y]){
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this.data[y][x] = value;
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}
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};
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//地图坐标转画布坐标
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Map.prototype.coord2position = function(cx,cy){
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return {
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x:this.x+cx*this.size+this.size/2,
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y:this.y+cy*this.size+this.size/2
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};
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};
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//画布坐标转地图坐标
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Map.prototype.position2coord = function(x,y){
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var fx = Math.abs(x-this.x)%this.size-this.size/2;
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var fy = Math.abs(y-this.y)%this.size-this.size/2;
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return {
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x:Math.floor((x-this.x)/this.size),
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y:Math.floor((y-this.y)/this.size),
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offset:Math.sqrt(fx*fx+fy*fy)
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};
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};
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//寻址算法
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Map.prototype.finder = function(params){
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var defaults = {
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map:null,
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start:{},
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end:{},
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type:'path'
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};
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var options = _extend({},defaults,params);
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if(options.map[options.start.y][options.start.x]||options.map[options.end.y][options.end.x]){ //当起点或终点设置在墙上
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return [];
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}
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var finded = false;
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var result = [];
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var y_length = options.map.length;
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var x_length = options.map[0].length;
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var steps = []; //步骤的映射
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for(var y=y_length;y--;){
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steps[y] = new Array(x_length).fill(0);
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}
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var _getValue = function(x,y){ //获取地图上的值
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if(options.map[y]&&typeof options.map[y][x]!='undefined'){
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return options.map[y][x];
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}
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return -1;
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};
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var _next = function(to){ //判定是否可走,可走放入列表
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var value = _getValue(to.x,to.y);
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if(value<1){
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if(value==-1){
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to.x = (to.x+x_length)%x_length;
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to.y = (to.y+y_length)%y_length;
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to.change = 1;
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}
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if(!steps[to.y][to.x]){
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result.push(to);
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}
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}
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};
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var _render = function(list){//找线路
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var new_list = [];
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var next = function(from,to){
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var value = _getValue(to.x,to.y);
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if(value<1){ //当前点是否可以走
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if(value==-1){
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to.x = (to.x+x_length)%x_length;
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to.y = (to.y+y_length)%y_length;
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to.change = 1;
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}
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if(to.x==options.end.x&&to.y==options.end.y){
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steps[to.y][to.x] = from;
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finded = true;
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}else if(!steps[to.y][to.x]){
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steps[to.y][to.x] = from;
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new_list.push(to);
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}
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}
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};
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list.forEach(function(current){
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next(current,{y:current.y+1,x:current.x});
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next(current,{y:current.y,x:current.x+1});
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next(current,{y:current.y-1,x:current.x});
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next(current,{y:current.y,x:current.x-1});
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});
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if(!finded&&new_list.length){
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_render(new_list);
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}
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};
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_render([options.start]);
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if(finded){
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var current=options.end;
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if(options.type=='path'){
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while(current.x!=options.start.x||current.y!=options.start.y){
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result.unshift(current);
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current=steps[current.y][current.x];
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}
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}else if(options.type=='next'){
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_next({x:current.x+1,y:current.y});
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_next({x:current.x,y:current.y+1});
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_next({x:current.x-1,y:current.y});
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_next({x:current.x,y:current.y-1});
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}
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}
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return result;
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};
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//布景对象构造器
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var Stage = function(params){
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this._params = params||{};
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this._settings = {
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index:0, //布景索引
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status:0, //布景状态,0表示未激活/结束,1表示正常,2表示暂停,3表示临时状态
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maps:[], //地图队列
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audio:[], //音频资源
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images:[], //图片资源
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items:[], //对象队列
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timeout:0, //倒计时(用于过程动画状态判断)
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update:function(){} //嗅探,处理布局下不同对象的相对关系
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};
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_extend(this,this._settings,this._params);
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};
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//添加对象
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Stage.prototype.createItem = function(options){
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var item = new Item(options);
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//动态属性
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if(item.location){
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var position = item.location.coord2position(item.coord.x,item.coord.y);
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item.x = position.x;
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item.y = position.y;
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}
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//关系绑定
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item._stage = this;
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item._id = this.items.length;
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this.items.push(item);
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return item;
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};
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//重置物体位置
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Stage.prototype.resetItems = function(){
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this.status = 1;
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this.items.forEach(function(item,index){
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_extend(item,item._settings,item._params);
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if(item.location){
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var position = item.location.coord2position(item.coord.x,item.coord.y);
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item.x = position.x;
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item.y = position.y;
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}
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});
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};
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//获取对象列表
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Stage.prototype.getItemsByType = function(type){
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return this.items.filter(function(item){
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if(item.type==type){
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return item;
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}
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});
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};
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//添加地图
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Stage.prototype.createMap = function(options){
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var map = new Map(options);
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//动态属性
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map.data = JSON.parse(JSON.stringify(map._params.data));
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map.y_length = map.data.length;
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map.x_length = map.data[0].length;
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map.imageData = null;
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//关系绑定
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map._stage = this;
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map._id = this.maps.length;
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this.maps.push(map);
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return map;
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};
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//重置地图
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Stage.prototype.resetMaps = function(){
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this.status = 1;
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this.maps.forEach(function(map){
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_extend(map,map._settings,map._params);
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map.data = JSON.parse(JSON.stringify(map._params.data));
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map.y_length = map.data.length;
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map.x_length = map.data[0].length;
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map.imageData = null;
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});
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};
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//重置
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Stage.prototype.reset = function(){
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_extend(this,this._settings,this._params);
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this.resetItems();
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this.resetMaps();
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};
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//绑定事件
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Stage.prototype.bind = function(eventType,callback){
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if(!_events[eventType]){
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_events[eventType] = {};
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window.addEventListener(eventType,function(e){
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var key = 's' + _index;
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if(_events[eventType][key]){
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_events[eventType][key](e);
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}
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e.preventDefault();
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});
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}
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_events[eventType]['s'+this.index] = callback.bind(this); //绑定事件作用域
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};
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//动画开始
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this.start = function() {
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var f = 0; //帧数计算
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var fn = function(){
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var stage = _stages[_index];
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_context.clearRect(0,0,_.width,_.height); //清除画布
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_context.fillStyle = '#000000';
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_context.fillRect(0,0,_.width,_.height);
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f++;
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if(stage.timeout){
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stage.timeout--;
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}
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if(stage.update()!=false){ //update返回false,则不绘制
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stage.maps.forEach(function(map){
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if(!(f%map.frames)){
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map.times = f/map.frames; //计数器
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}
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if(map.cache){
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if(!map.imageData){
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_context.save();
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map.draw(_context);
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map.imageData = _context.getImageData(0,0,_.width,_.height);
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_context.restore();
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}else{
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_context.putImageData(map.imageData,0,0);
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}
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}else{
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map.update();
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map.draw(_context);
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}
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});
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stage.items.forEach(function(item){
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if(!(f%item.frames)){
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item.times = f/item.frames; //计数器
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}
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if(stage.status==1&&item.status!=2){ //对象及布景状态都不处于暂停状态
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if(item.location){
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item.coord = item.location.position2coord(item.x,item.y);
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}
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if(item.timeout){
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item.timeout--;
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}
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item.update();
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}
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item.draw(_context);
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});
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}
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_hander = requestAnimationFrame(fn);
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};
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_hander = requestAnimationFrame(fn);
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};
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//动画结束
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this.stop = function(){
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_hander&&cancelAnimationFrame(_hander);
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};
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//事件坐标
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this.getPosition = function(e){
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var box = $canvas.getBoundingClientRect();
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return {
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x:e.clientX-box.left*(_.width/box.width),
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y:e.clientY-box.top*(_.height/box.height)
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};
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}
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//创建布景
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this.createStage = function(options){
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var stage = new Stage(options);
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stage.index = _stages.length;
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_stages.push(stage);
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return stage;
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};
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//指定布景
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this.setStage = function(index){
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_stages[_index].status = 0;
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_index = index;
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_stages[_index].status = 1;
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_stages[_index].reset(); //重置
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return _stages[_index];
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};
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//下个布景
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this.nextStage = function(){
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if(_index<_stages.length-1){
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return this.setStage(++_index);
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}else{
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throw new Error('unfound new stage.');
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}
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};
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//获取布景列表
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this.getStages = function(){
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return _stages;
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};
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//初始化游戏引擎
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this.init = function(){
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_index = 0;
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this.start();
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};
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}
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