利用HTML5 Canvas制作一个简单的打飞机游戏
之前在当耐特的DEMO里看到个打飞机的游戏,然后就把他的图片和音频扒了了下来。。。。自己凭着玩的心情重新写了一个。仅供娱乐哈。。。。。。我没有用框架,所有js都是自己写的。。。。。。所以就可以来当个简单的教程,对那些刚玩canvas的,或许能有些帮助,楼主玩canvas也不是很久,技术不是很好,请见谅哈。
闲话不多说,先上DEMO撒飞机游戏 楼主写这个人纯碎娱乐,没想着写成多正式的游戏哈。
步入主题啦打飞机游戏文件有index.html入口文件,allSprite.js精灵的逻辑处理文件,loading.js加载处理文件以及data.js(初始化的一些数据)。
,正常的游戏基本上都需要一个loading,loading页面就是用来预加载数据的,包括精灵表图片,音频等,因为这是个小游戏,要加载的就只有一些音频和图片。里面的加载代码主要就狼蚁网站SEO优化这些,其他是制作loading动画的,那个比较简单,就不贴了,如果有兴趣的直接在DEMO里看控制台就行了
- loadImg:function(datas){
- var _this = this;
- var dataIndex = 0;
- li();
- function li(){
- if(datas[dataIndex].indexOf("mp3")>=0){
- var audio = document.createElement("audio");
- document.body.appendChild(audio);
- audio.preload = "auto";
- audio.src = datas[dataIndex];
- audio.oncanplaythrough = function(){
- this.oncanplaythrough = null;
- dataIndex++;
- if(dataIndex===datas.length){
- _this.percent = 100;
- }else {
- _this.percent = parseInt(dataIndex/datas.length100);
- li.call(_this);
- }
- }
- }else {
- preLoadImg(datas[dataIndex] , function(){
- dataIndex++;
- if(dataIndex===datas.length){
- _this.percent = 100;
- } else {
- _this.percent = parseInt(dataIndex/datas.length100);
- li.call(_this);
- }
- })
- }
- }
- },
- //再贴出preLoadImg的方法
- function preLoadImg(src , callback){
- var img = new Image();
- img.src = src;
- if(img.plete){
- callback.call(img);
- }else {
- img.onload = function(){
- callback.call(img);
- }
- }
- }
我先在data.js里面用一个数组保存文件的链接,然后判断这些链接是图片还是音频,如果是图片就用preLoadImg加载,预加载图片的代码很简单,就是new一个图片对象,然后把链接赋给它,加载完后再回调。音频的加载则是通过生成一个HTML5的audio dom对象,把链接赋给它,audio有一个事件“canplaythrough”,浏览器预计能够在不停下来进行缓冲的情况下持续播放指定的音频/视频时,会发生 canplaythrough 事件,也就是说当canplaythrough被调用时,音频就已经被加载的差不多了,可以进行下一个音频的加载了。就这样当把所有东西都加载完后,再进行回调,开始游戏。
游戏开始了,一个游戏,会需要很多的对象,所以我就统一写成了一个精灵对象,不同对象之间的每一帧的运动情况直接用behavior来分别编写就行了。
- W.Sprite = function(name , painter , behaviors , args){
- if(name !== undefined) this.name = name;
- if(painter !== undefined) this.painter = painter;
- this. = 0;
- this.left = 0;
- this.width = 0;
- this.height = 0;
- this.velocityX = 3;
- this.velocityY = 2;
- this.visible = true;
- this.animating = false;
- this.behaviors = behaviors;
- this.rotateAngle = 0;
- this.blood = 50;
- this.fullBlood = 50;
- if(name==="plan"){
- this.rotateSpeed = 0.05;
- this.rotateLeft = false;
- this.rotateRight = false;
- this.fire = false;
- this.firePerFrame = 10;
- this.fireLevel = 1;
- }else if(name==="star"){
- this.width = Math.random()2;
- this.speed = 1this.width/2;
- this.lightLength = 5;
- this.cacheCanvas = document.createElement("canvas");
- thisthis.cacheCtx = this.cacheCanvas.getContext('2d');
- thisthis.cacheCanvas.width = this.width+this.lightLength2;
- thisthis.cacheCanvas.height = this.width+this.lightLength2;
- this.painter.cache(this);
- }else if(name==="badPlan"){
- this.badKind = 1;
- this.speed = 2;
- this.rotateAngle = Math.PI;
- }else if(name==="missle"){
- this.width = missleWidth;
- }else if(name==="boom"){
- this.width = boomWidth;
- }else if(name==="food"){
- this.width = 40;
- this.speed = 3;
- this.kind = "LevelUP"
- }
- this.toLeft = false;
- this.toTop = false;
- this.toRight = false;
- this.toBottom = false;
- this.outArcRadius = Math.sqrt((this.width/2this.width/2)2);
- if(args){
- for(var arg in args){
- this[arg] = args[arg];
- }
- }
- }
- Sprite.prototype = {
- constructor:Sprite,
- paint:function(){
- if(this.name==="badPlan"){this.update();}
- if(this.painter !== undefined && this.visible){
- if(this.name!=="badPlan") {
- this.update();
- }
- if(this.name==="plan"||this.name==="missle"||this.name==="badPlan"){
- ctx.save();
- ctx.translate(this.left , this.);
- ctx.rotate(this.rotateAngle);
- this.painter.paint(this);
- ctx.restore();
- }else {
- this.painter.paint(this);
- }
- }
- },
- update:function(time){
- if(this.behaviors){
- for(var i=0;i<this.behaviors.length;i++){
- this.behaviors[i].execute(this,time);
- }
- }
- }
- }
写出精灵类后,就可以通过编写每个的painter以及behavior来生成不同的对象了。接下来就是写painter了,painter分成两种,一种是普通的painter,一种就是精灵表painter,因为像爆炸动画,飞机开枪动画,都不是一张图片就能搞定的,所以就需要用到精灵表了
而绘制这些就要为他们定制一个精灵表绘制器,狼蚁网站SEO优化这个是最简单的精灵表绘制器,针对游戏的复杂性可以相对的修改精灵表写法,直到合适,不过原理都大同小异,就是小修小改而已
- var SpriteSheetPainter = function(cells){
- this.cells = cells || [];
- this.cellIndex = 0;
- }
- SpriteSheetPainter.prototype = {
- advance:function(){
- if(this.cellIndex === this.cells.length-1){
- this.cellIndex = 0;
- }
- else this.cellIndex++;
- },
- paint:function(sprite){
- var cell = this.cells[this.cellIndex];
- context.drawImage(spritesheet , cell.x , cell.y , cell.w , cell.h , sprite.left , sprite. , cell.w , cell.h);
- }
- }
而普通的绘制器就更简单了,直接写一个painter,把要画的什么东西都写进去就行了。
有了精灵类和精灵表绘制器后,我们就可以把星星,飞机,子弹,爆炸对象都写出来了狼蚁网站SEO优化是整个allSprite.js的代码
- (function(W){
- "use strict"
- var planWidth = 24,
- planHeight = 24,
- missleWidth = 70,
- missleHeight = 70,
- boomWidth = 60;
- //精灵类
- W.Sprite = function(name , painter , behaviors , args){
- if(name !== undefined) this.name = name;
- if(painter !== undefined) this.painter = painter;
- this. = 0;
- this.left = 0;
- this.width = 0;
- this.height = 0;
- this.velocityX = 3;
- this.velocityY = 2;
- this.visible = true;
- this.animating = false;
- this.behaviors = behaviors;
- this.rotateAngle = 0;
- this.blood = 50;
- this.fullBlood = 50;
- if(name==="plan"){
- this.rotateSpeed = 0.05;
- this.rotateLeft = false;
- this.rotateRight = false;
- this.fire = false;
- this.firePerFrame = 10;
- this.fireLevel = 1;
- }else if(name==="star"){
- this.width = Math.random()2;
- this.speed = 1this.width/2;
- this.lightLength = 5;
- this.cacheCanvas = document.createElement("canvas");
- this.cacheCtx = this.cacheCanvas.getContext('2d');
- this.cacheCanvas.width = this.width+this.lightLength2;
- this.cacheCanvas.height = this.width+this.lightLength2;
- this.painter.cache(this);
- }else if(name==="badPlan"){
- this.badKind = 1;
- this.speed = 2;
- this.rotateAngle = Math.PI;
- }else if(name==="missle"){
- this.width = missleWidth;
- }else if(name==="boom"){
- this.width = boomWidth;
- }else if(name==="food"){
- this.width = 40;
- this.speed = 3;
- this.kind = "LevelUP"
- }
- this.toLeft = false;
- this.toTop = false;
- this.toRight = false;
- this.toBottom = false;
- this.outArcRadius = Math.sqrt((this.width/2this.width/2)2);
- if(args){
- for(var arg in args){
- this[arg] = args[arg];
- }
- }
- }
- Sprite.prototype = {
- constructor:Sprite,
- paint:function(){
- if(this.name==="badPlan"){this.update();}
- if(this.painter !== undefined && this.visible){
- if(this.name!=="badPlan") {
- this.update();
- }
- if(this.name==="plan"||this.name==="missle"||this.name==="badPlan"){
- ctx.save();
- ctx.translate(this.left , this.);
- ctx.rotate(this.rotateAngle);
- this.painter.paint(this);
- ctx.restore();
- }else {
- this.painter.paint(this);
- }
- }
- },
- update:function(time){
- if(this.behaviors){
- for(var i=0;i<this.behaviors.length;i++){
- this.behaviors[i].execute(this,time);
- }
- }
- }
- }
- // 精灵表绘制器
- W.SpriteSheetPainter = function(cells , isloop , endCallback , spritesheet){
- this.cells = cells || [];
- this.cellIndex = 0;
- this.dateCount = null;
- this.isloop = isloop;
- this.endCallback = endCallback;
- this.spritesheet = spritesheet;
- }
- SpriteSheetPainter.prototype = {
- advance:function(){
- this.cellIndex = this.isloop?(this.cellIndex===this.cells.length-1?0:this.cellIndex+1):(this.cellIndex+1);
- },
- paint:function(sprite){
- if(this.dateCount===null){
- this.dateCount = new Date();
- }else {
- var newd = new Date();
- var tc = newd-this.dateCount;
- if(tc>40){
- this.advance();
- this.dateCount = newd;
- }
- }
- if(this.cellIndex<this.cells.length || this.isloop){
- var cell = this.cells[this.cellIndex];
- ctx.drawImage(this.spritesheet , cell.x , cell.y , cell.w , cell.h , sprite.left-sprite.width/2 , sprite.-sprite.width/2 , cell.w , cell.h);
- } else if(this.endCallback){
- this.endCallback.call(sprite);
- this.cellIndex = 0;
- }
- }
- }
- //特制飞机精灵表绘制器
- W.controllSpriteSheetPainter = function(cells , spritesheet){
- this.cells = cells || [];
- this.cellIndex = 0;
- this.dateCount = null;
- this.isActive = false;
- this.derection = true;
- this.spritesheet = spritesheet;
- }
- controllSpriteSheetPainter.prototype = {
- advance:function(){
- if(this.isActive){
- this.cellIndex++;
- if(this.cellIndex === this.cells.length){
- this.cellIndex = 0;
- this.isActive = false;
- }
- }
- },
- paint:function(sprite){
- if(this.dateCount===null){
- this.dateCount = new Date();
- }else {
- var newd = new Date();
- var tc = newd-this.dateCount;
- if(tc>sprite.firePerFrame){
- this.advance();
- this.dateCount = newd;
- }
- }
- var cell = this.cells[this.cellIndex];
- ctx.drawImage(this.spritesheet , cell.x , cell.y , cell.w , cell.h , -planWidth/2 , -planHeight/2 , cell.w , cell.h);
- }
- }
- W.planBehavior = [
- {execute:function(sprite,time){
- if(sprite.toTop){
- sprite. = sprite.<planHeight/2? sprite. : sprite.-sprite.velocityY;
- }
- if(sprite.toLeft){
- sprite.left = sprite.left<planWidth/2? sprite.left : sprite.left-sprite.velocityX;
- }
- if(sprite.toRight){
- sprite.left = sprite.left>canvas.width-planWidth/2? sprite.left : sprite.left+sprite.velocityX;
- }
- if(sprite.toBottom){
- sprite. = sprite.>canvas.height-planHeight/2? sprite. : sprite.+sprite.velocityY;
- }
- if(sprite.rotateLeft){
- sprite.rotateAngle -= sprite.rotateSpeed;
- }
- if(sprite.rotateRight){
- sprite.rotateAngle += sprite.rotateSpeed;
- }
- if(sprite.fire&&!sprite.painter.isActive){
- sprite.painter.isActive = true;
- this.shot(sprite);
- }
- },
- shot:function(sprite){
- this.addMissle(sprite , sprite.rotateAngle);
- var missleAngle = 0.1
- for(var i=1;i<sprite.fireLevel;i++){
- this.addMissle(sprite , sprite.rotateAngle-imissleAngle);
- this.addMissle(sprite , sprite.rotateAngle+imissleAngle);
- }
- var audio = document.getElementsByTagName("audio");
- for(var i=0;i<audio.length;i++){
- console.log(audio[i].paused)
- if(audio[i].src.indexOf("shot")>=0&&audio[i].paused){
- audio[i].play();
- break;
- }
- }
- },
- addMissle:function(sprite , angle){
- for(var j=0;j<missles.length;j++){
- if(!missles[j].visible){
- missles[j].left = sprite.left;
- missles[j]. = sprite.;
- missles[j].rotateAngle = angle;
- var missleSpeed = 20;
- missles[j].velocityX = missleSpeedMath.sin(-missles[j].rotateAngle);
- missles[j].velocityY = missleSpeedMath.cos(-missles[j].rotateAngle);
- missles[j].visible = true;
- break;
- }
- }
- }
- }
- ]
- W.starBehavior = [
- {execute:function(sprite,time){
- if(sprite. > canvas.height){
- sprite.left = Math.random()canvas.width;
- sprite. = Math.random()canvas.height - canvas.height;
- }
- sprite. += sprite.speed;
- }}
- ]
- W.starPainter = {
- paint:function(sprite){
- ctx.drawImage(sprite.cacheCanvas , sprite.left-sprite.width/2-sprite.lightLength , sprite.-sprite.width/2-sprite.lightLength)
- },
- cache:function(sprite){
- sprite.cacheCtx.save();
- var opacity = 0.5,addopa = 1/sprite.lightLength;
- sprite.cacheCtx.fillStyle = "rgba(255,255,255,0.8)";
- sprite.cacheCtx.beginPath();
- sprite.cacheCtx.arc(sprite.width/2+sprite.lightLength , sprite.width/2+sprite.lightLength , sprite.width/2 , 0 , 2Math.PI);
- sprite.cacheCtx.fill();
- for(var i=1;i<=sprite.lightLength;i+=2){
- opacity-=addopa;
- sprite.cacheCtx.fillStyle = "rgba(255,255,255,"+opacity+")";
- sprite.cacheCtx.beginPath();
- sprite.cacheCtx.arc(sprite.width/2+sprite.lightLength , sprite.width/2+sprite.lightLength , sprite.width/2+i , 0 , 2Math.PI);
- sprite.cacheCtx.fill();
- }
- }
- }
- W.foodBehavior = [
- {execute:function(sprite,time){
- sprite. += sprite.speed;
- if(sprite. > canvas.height+sprite.width){
- sprite.visible = false;
- }
- }}
- ]
- W.foodPainter = {
- paint:function(sprite){
- ctx.fillStyle = "rgba("+parseInt(Math.random()255)+","+parseInt(Math.random()255)+","+parseInt(Math.random()255)+",1)"
- ctx.font="15px 微软雅黑"
- ctx.textAlign = "center";
- ctx.textBaseline = "middle";
- ctx.fillText(sprite.kind , sprite.left , sprite.);
- }
- }
- W.missleBehavior = [{
- execute:function(sprite,time){
- sprite.left -= sprite.velocityX;
- sprite. -= sprite.velocityY;
- if(sprite.left<-missleWidth/2||sprite.<-missleHeight/2||sprite.left>canvas.width+missleWidth/2||sprite.<-missleHeight/2){
- sprite.visible = false;
- }
- }
- }];
- W.misslePainter = {
- paint:function(sprite){
- var img = new Image();
- img.src="../planGame/image/plasma.png"
- ctx.drawImage(img , -missleWidth/2+1 , -missleHeight/2+1 , missleWidth , missleHeight);
- }
- }
- W.badPlanBehavior = [{
- execute:function(sprite,time){
- if(sprite. > canvas.height || !sprite.visible){
- var random = Math.random();
- if(point>=200&&point<400){
- sprite.fullBlood = 150;
- if(random<0.1){
- sprite.badKind = 2;
- sprite.fullBlood = 250;
- }
- }else if(point>=400&&point<600){
- sprite.fullBlood = 250;
- if(random<0.2){
- sprite.badKind = 2;
- sprite.fullBlood = 400;
- }
- if(random<0.1){
- sprite.badKind = 3;
- sprite.fullBlood = 600;
- }
- }else if(point>=600){
- sprite.fullBlood = 500;
- if(random<0.4){
- sprite.badKind = 2;
- sprite.fullBlood = 700;
- }
- if(random<0.2){
- sprite.badKind = 3;
- sprite.fullBlood = 1000;
- }
- }
- sprite.visible = true;
- sprite.blood = sprite.fullBlood;
- sprite.left = Math.random()(canvas.width-2planWidth)+planWidth;
- sprite. = Math.random()canvas.height - canvas.height;
- }
- sprite. += sprite.speed;
- },
- shot:function(sprite){
- this.addMissle(sprite , sprite.rotateAngle);
- var missleAngle = 0.1
- for(var i=1;i<sprite.fireLevel;i++){
- this.addMissle(sprite , sprite.rotateAngle-imissleAngle);
- this.addMissle(sprite , sprite.rotateAngle+imissleAngle);
- }
- },
- addMissle:function(sprite , angle){
- for(var j=0;j<missles.length;j++){
- if(!missles[j].visible){
- missles[j].left = sprite.left;
- missles[j]. = sprite.;
- missles[j].rotateAngle = angle;
- var missleSpeed = 20;
- missles[j].velocityX = missleSpeedMath.sin(-missles[j].rotateAngle);
- missles[j].velocityY = missleSpeedMath.cos(-missles[j].rotateAngle);
- missles[j].visible = true;
- break;
- }
- }
- }
- }];
- W.badPlanPainter = {
- paint:function(sprite){
- var img = new Image();
- img.src="../planGame/image/ship.png"
- switch(sprite.badKind){
- case 1:ctx.drawImage(img , 96 , 0 , planWidth , planWidth , -planWidth/2 , -planHeight/2 , planWidth , planWidth);
- break;
- case 2:ctx.drawImage(img , 120 , 0 , planWidth , planWidth , -planWidth/2 , -planHeight/2 , planWidth , planWidth);
- break;
- case 3:ctx.drawImage(img , 144 , 0 , planWidth , planWidth , -planWidth/2 , -planHeight/2 , planWidth , planWidth);
- break;
- }
- ctx.strokeStyle = "#FFF";
- ctx.fillStyle = "#F00";
- var bloodHeight = 1;
- ctx.strokeRect(-planWidth/2-1 , planHeight+bloodHeight+3 , planWidth+2 , bloodHeight+2);
- ctx.fillRect(planWidth/2-planWidthsprite.blood/sprite.fullBlood , planHeight+bloodHeight+3 , planWidthsprite.blood/sprite.fullBlood , bloodHeight);
- }
- }
- W.planSize = function(){
- return {
- w:planWidth,
- h:planHeight
- }
- }
- })(window);
这些绘制方法之类的都相对比较简单。
主要说一下飞机的运动以及对象数量的控制,飞机怎么运动?毫无疑问,通过键盘控制它运动,可能很多人就会想到通过keydown这个方法按下的时候通过判断keyCode来让飞机持续运动。有个问题,keydown事件不支持多键按下,也就是说,当你按下X键时,keyCode是88,与此你按下方向键后,keyCode会瞬间变成37,也就是说,如果你单纯的想靠keydown来控制飞机运动,飞机就只能做一件事,要么只可以往某个方向移动,要么只会开枪。
所以,我们要通过keydown和keyup来实现飞机的运动,原理很容易理解当我们按下往左的方向键时,我们给飞机一个往左的状态,也就是让飞机的toLeft属性为true,而在动画循环中,判断飞机的状态,如果toLeft为true则飞机的x值不停地减少,飞机也就会不停地往左移动,然后当我们抬起手指时触发keyup事件,我们就再keyup事件中解除飞机往左的状态。飞机也就停止往左移动了。其他状态也一样的原理,这样写的话,就能够让飞机多种状态于一生了。可以开枪到处跑了。
实现的代码如下
- //keydown/keyup事件的绑定
- window.onkeydown = function(event){
- switch(event.keyCode){
- case 88:myplan.fire = true;
- break;
- case 90:myplan.rotateLeft=true;
- break;
- case 67:myplan.rotateRight=true;
- break;
- case 37:myplan.toLeft = true;
- break;
- case 38:myplan.toTop = true;
- break;
- case 39:myplan.toRight = true;
- break;
- case 40:myplan.toBottom = true;
- break;
- }
- }
- window.onkeyup = function(event){
- switch(event.keyCode){
- case 88:myplan.fire = false;
- break;
- case 90:myplan.rotateLeft=false;
- break;
- case 67:myplan.rotateRight=false;
- break;
- case 37:myplan.toLeft = false;
- break;
- case 38:myplan.toTop = false;
- break;
- case 39:myplan.toRight = false;
- break;
- case 40:myplan.toBottom = false;
- break;
- }
- }
- //飞机每一帧的状态更新处理代码
- execute:function(sprite,time){
- if(sprite.toTop){
- spritesprite. = sprite.<planHeight/2? sprite. : sprite.-sprite.velocityY;
- }
- if(sprite.toLeft){
- spritesprite.left = sprite.left<planWidth/2? sprite.left : sprite.left-sprite.velocityX;
- }
- if(sprite.toRight){
- spritesprite.left = sprite.left>canvas.width-planWidth/2? sprite.left : sprite.left+sprite.velocityX;
- }
- if(sprite.toBottom){
- spritesprite. = sprite.>canvas.height-planHeight/2? sprite. : sprite.+sprite.velocityY;
- }
- if(sprite.rotateLeft){
- sprite.rotateAngle -= sprite.rotateSpeed;
- }
- if(sprite.rotateRight){
- sprite.rotateAngle += sprite.rotateSpeed;
- }
- if(sprite.fire&&!sprite.painter.isActive){
- sprite.painter.isActive = true;
- this.shot(sprite);
- }
就是如此简单。
然后说下对象控制,打飞机游戏,会发射大量子弹,产生大量对象,包括爆炸啊,飞机啊,子弹等,如果不停地进行对象的生成和销毁,会让浏览器的负荷变得很大,运行了一段时间后就会卡出翔了。所以,我们要用可以循环利用的对象来解决这个问题,不进行对象的销毁,对所有对象进行保存,循环利用。
我的做法就是,在游戏初始化的时候,直接生成一定数量的对象,存放在数组里面。当我们需要一个对象的时候,就从里面取,当用完后,再放回数组里面。数组里的所有对象都有一个属性,visible,代表对象当前是否可用。
举个例子,当我的飞机发射一发炮弹,我需要一发炮弹,所以我就到炮弹数组里遍历,如果遍历到的炮弹visible为true,也就说明该对象正在使用着,不能拿来用,所以继续遍历,直到遍历到visible为false的炮弹对象,说明这个对象暂时没人用。然后就可以拿过来重新设置属性,投入使用了。当炮弹击中敌人或者打出画布外的时候,把炮弹的visible设成false,又成了一个没人用的炮弹在数组里存放起来等待下一次调用。
所以,我们要预算算好页面大概要用到多少个对象,然后就预先准备好对象,这样,在游戏进行中,不会有对象进行生成和销毁,对游戏性能方面就有了提升了。
再说下音频,游戏里面要用到多个同样的audio才能保证音效的不间断性
复制代码
- var audio = document.getElementsByTagName("audio");
- for(var i=0;i<audio.length;i++){
- console.log(audio[i].paused)
- if(audio[i].src.indexOf("boom")>=0&&audio[i].paused){
- audio[i].play();
- break;
- }
- }
好吧,基本上就这样了。技术或许还不够好,纯碎做个记录,如果代码有不当正处,欢迎指出,共同学习。
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