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   源码介绍

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自定义飞机图片数量，子弹图片，速度

var canvas=document.getElementById("myCanvas");
var context=canvas.getContext('2d');
document.addEventListener("keydown",onkeydown);
var message_txt=document.getElementById("message_txt");
var score_txt=document.getElementById("score_txt");

var plans=[];
var bullets=[];
var bombs=[];
var score=0;
var overflag=false;
var mBitposY0,mBitposY1;

var mScreenWidth=320;
var mScreenHeight=480;
var myplane;
var image=new Image();
var image2=new Image();
var image3=new Image();
var image4=new Image();
var image5=new Image();

var background0=new Image();
background0.src="map_0.png"; 
var background1=new Image();
background1.src="map_1.png"; 



var Plan=function (image,x,y,n){
	this.image=image;
	this.x=x;
	this.y=y;
	this.originX=x;
	this.originY=y;
	this.width=image.width/n;
	this.height=image.height;
	this.frm=0;
	this.dis=0;
	this.n=n;
}
Plan.prototype.testPoint=function(x,y){
	var betweemX=(x>=this.x) && (x<=this.x this.width);
	var betweemY=(y>=this.y) && (y<=this.y this.height);
	return betweenX && betweenY;
}
Plan.prototype.move=function (dx,dy){
	this.x =dx;
	this.y =dy;
}
Plan.prototype.Y=function (){
	return this.y;
}
Plan.prototype.draw=function (ctx){
	ctx.save();
	ctx.translate(this.x,this.y);
	ctx.drawImage(this.image,this.frm*this.width,0,this.width,this.height,0,0,this.width,this.height);
	ctx.restore();
	this.y  ;
	this.x=this.originX 20*Math.sin(Math.PI/100 * this.y);
	this.dis  ;
	if(this.dis>=3){
		this.dis=0;
		this.frm  ;
		if(this.frm>=this.n)
		this.frm=0;
	}
}
Plan.prototype.draw2=function (ctx){
	ctx.save();
	ctx.translate(this.x,this.y);
	ctx.drawImage(this.image,this.frm*this.width,0,this.width,this.height,0,0,this.width,this.height);
	ctx.restore();
	// this.y  ;
	// this.x=this.originX 20*Math.sin(Math.PI/100 * this.y);
	this.dis  ;
	if(this.dis>=3){
		this.dis=0;
		this.frm  ;
		if(this.frm>=this.n)
		this.frm=0;
	}
}
Plan.prototype.hitTestObject=function (planobj){
	if(isColliding(this.x,this.y,this.width,this.height,planobj.x,planobj.y,planobj.width,planobj.height))
	return true;
	else
	return false;
}

function init(){
	mBitposY0=-mScreenHeight;
	mBitposY1=-mScreenHeight;
}
function updateBg(){
	mBitposY0  =5;
	mBitposY1  =5;
	if(mBitposY0== mScreenHeight){
		mBitposY0=-mScreenHeight;
	}
	if(mBitposY1== mScreenHeight){
		mBitposY1=-mScreenHeight;
	}
}
image.src="plan.png";
image.onload=function(){
}
image2.src="bomb.png";
image2.onload=function(){
	
}
image3.src="enemy.png";
image3.onload=function(){
	myplane=new Plan(image,300*Math.random(),400,6);
	init();
	plan_interval=setInterval(function(){
		plans.push(new Plan(image3,300*Math.random(),20*Math.random(),2));
	},3000);
	setInterval(function(){
		context.clearRect(0,0,320,480);
		context.drawImage(background0,0,mBitposY0);
		context.drawImage(background1,0,mBitposY1);
		updateBg();
		if(!overflag)
		myplane.draw2(context);
		for(var i=plans.length-1;i>=0;i--){
			if(plans[i].Y()>400)
				plans.splice(i,1);
				else
				plans[i].draw(context);
			
		}
		for(var i=bullets.length-1;i>=0;i--){
			if(bullets[i].Y()<0)
				bullets.splice(i,1);
				else
				bullets[i].draw(context);
			
		}
		for(var i=plans.length-1;i>=0;i--){
			e1=plans[i];
			if(e1!=null && myplane!=null && myplane.hitTestObject(e1)){
				clearInterval(plan_interval);
				plans.splice(i,1);
				bombs.push(new Bomb(image2,myplane.x,myplane.y));
				message_txt.innerHTML="敌机碰到玩家自己飞机，游戏结束";
				overflag=true;
			}
		}
		for(var j=bullets.length-1;j>=0;j--){
			var b1=bullets[j];
			for(var i=plans.length-1;i>=0;i--){
				e1=plans[i];
				if(e1!=null && b1!=null && b1.hitTestObject(e1)){
					
					plans.splice(i,1);
					bullets.splice(i,1);
					bombs.push(new Bomb(image2,b1.x,b1.y-36));
					message_txt.innerHTML="敌机被击中，加20分";
					score  =20;
					score_txt.innerHTML="分数：" score "分";
				}
			}
		}
		for(var i=bombs.length-1;i>=0;i--){
			if(bombs[i].frm>=6)
			bombs.splice(i,1);
			else
			bombs[i].draw2(context);
		}
	},1000/60)
}
image4.src="bullet.png";
image4.onload=function(){
	
}
function onkeydown(e){
	if(e.keyCode==32){
		bullets.push(new Bullet(image4,myplane.x,myplane.y-36));
	}else if(e.keyCode==37){
		myplane.move(-10,0);
	}
	else if(e.keyCode==39){
		myplane.move(10,0);
	}
	else if(e.keyCode==38){
		myplane.move(0,-10);
	}
	else if(e.keyCode==40){
		myplane.move(0,10);
	}
}



/* var Actor=function (x,y,w,h){
	this.x=x;
	this.y=y;
	this.w=w;
	this.h=h;
}
Actor.prototype.isCollidingWidth=function(px,py){
	if(px>this.x && px<this.x   this.w && px>this.y && py<this.y this.h)
	return true;
	else
	return false;
}
Actor.prototype.isCollidingWidth=function(another){
	if(isCollidingWidth(another.x,another.y) || isCollidingWidth(another.x another.w,another.y)
	|| isCollidingWidth(another.x,another.y another.h)
	||isCollidingWidth(another.x another.w,another.y another.h))
	return true;
	else
	return false;
} */
function isColliding(ax,ay,aw,ah,bx,by,bw,bh){
	if(ay>by bh || by>ay ah || ax>bx bw || bx>ax aw)
	return false;
	else
	return true;
}


var Bullet=function (image,x,y){
	this.image=image;
	this.x=x;
	this.y=y;
	this.width=image.width/4;
	this.height=image.height;
	this.frm=0;
	this.dis=0;
}
Bullet.prototype.testPoint=function(x,y){
	var betweemX=(x>=this.x) && (x<=this.x this.width);
	var betweemY=(y>=this.y) && (y<=this.y this.height);
	return betweenX && betweenY;
}
Bullet.prototype.move=function (dx,dy){
	this.x =dx;
	this.y =dy;
}
Bullet.prototype.Y=function (){
	return this.y;
}
Bullet.prototype.draw=function (ctx){
	ctx.save();
	ctx.translate(this.x,this.y);
	ctx.drawImage(this.image,this.frm*this.width,0,this.width,this.height,0,0,this.width,this.height);
	ctx.restore();
	this.y--;
	this.dis  ;
	if(this.dis>=10){
		this.dis=0;
		this.frm  ;
		if(this.frm>=4)
		this.frm=0;
	}
}
Bullet.prototype.hitTestObject=function (planobj){
	if(isColliding(this.x,this.y,this.width,this.height,planobj.x,planobj.y,planobj.width,planobj.height))
	return true;
	else
	return false;
}






var Bomb=function (image,x,y){
	this.image=image;
	this.x=x;
	this.y=y;
	this.width=image.width/6;
	this.height=image.height;
	this.frm=0;
	this.dis=0;
}
Bomb.prototype.draw2=function (ctx){
	ctx.save();
	ctx.translate(this.x,this.y);
	ctx.drawImage(this.image,this.frm*this.width,0,this.width,this.height,0,0,this.width,this.height);
	ctx.restore();
	this.dis  ;
	if(this.dis>=10){
		this.dis=0;
		this.frm  ;
	}
}