Javascript 在HTML5上绘制多个精灵图像
目前,我已将一些函数合并到一个类中。所以,对于我来说,在数组中存储多幅精灵图像会更容易。但是,是否有一种方法可以手动绘制它们,而不是通过数组outprint设置并自动绘制?这是我的密码:Javascript 在HTML5上绘制多个精灵图像,javascript,arrays,html,sprite,Javascript,Arrays,Html,Sprite,目前,我已将一些函数合并到一个类中。所以,对于我来说,在数组中存储多幅精灵图像会更容易。但是,是否有一种方法可以手动绘制它们,而不是通过数组outprint设置并自动绘制?这是我的密码: <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Fish Animation<
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Fish Animation</title>
<style type='text/css'>
canvas {border:1px solid; background-color:#EFEFEF;}
</style>
<script type='text/javascript'>
window.onload=function(){
var canvas = document.getElementById('pondCanvas');
var context = canvas.getContext('2d');
polyFillRAFNow() ;
var frameCount = 8 ;
var frameWidth, frameHeight ;
var frameScale = 0.4 ;
var animIndex = 0 ;
var animFrames = [0, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 6, 5, 4, 4, 3, 2, 2, 1, 1, 1];
var xPos = canvas.width / 2,
yPos = canvas.height / 2;
var speedX;
var speedY;
var speedXSign;
var speedYSign;
var fishes = [];
var anotherFish;
function Fish(xPos, yPos, speedX, speedY, imgFish, frameWidth, frameHeight) {
this.image = imgFish;
this.xPos = canvas.width / 2;
this.yPos = canvas.height / 2;
this.speedX = speedX;
this.speedY = speedY;
this.frameWidth = frameWidth;
this.frameHeight = frameHeight;
this.frameCount = 8;
this.frameScale = 0.4;
this.animIndex = 0;
this.animFrames = [0, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 6, 5, 4, 4, 3, 2, 2, 1, 1, 1];
}
Fish.prototype.changeDirection = function () {
speedXSign = this.speedX > 0 ? 1 : -1;
speedYSign = this.speedY > 0 ? 1 : -1;
this.speedX = speedXSign * (1 + Math.random() * 1.7);
this.speedY = speedYSign * (1 + Math.random() * 2);
};
Fish.prototype.move = function () {
this.animIndex++;
if ( this.animIndex == animFrames.length) this.animIndex = 0;
this.xPos += this.speedX;
if ((this.xPos + this.frameWidth * this.frameScale / 1.8) >= canvas.width ||
(this.xPos - this.frameWidth * this.frameScale / 1.8) <= 0) {
this.speedX = -this.speedX;
}
this.yPos += this.speedY;
if ((this.yPos + this.frameHeight * frameScale / 1.8) >= canvas.height ||
(this.yPos - this.frameHeight * frameScale / 1.8) <= 0) {
this.speedY = -this.speedY;
}
};
Fish.prototype.drawFish = function () {
context.save();
context.translate(this.xPos, this.yPos);
var speedXSign = this.speedX > 0 ? 1 : -1;
var speedYSign = this.speedY > 0 ? 1 : -1;
context.scale(speedXSign, speedYSign);
var frameIndex = animFrames[this.animIndex];
context.drawImage(imgFish, frameIndex * this.frameWidth, 0, frameWidth, frameHeight,
-frameWidth * frameScale / 2, -this.frameHeight * this.frameScale / 2,
this.frameWidth * this.frameScale, this.frameHeight * this.frameScale);
context.restore();
};
function animate() {
requestAnimationFrame(animate);
context.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < fishes.length; i++){
var fish = fishes[i];
fish.changeDirection();
fish.move();
fish.drawFish();
}
}
var imgFish = new Image();
imgFish.onload = init;
imgFish.src = 'http://dl.dropbox.com/s/4x14mv75dx7bmi5/FishStrip.png';
function init() {
frameWidth = imgFish.width / frameCount ;
frameHeight = imgFish.height ;
for (var i = 0; i < 3; i++) {
var anotherFish = new Fish(xPos, yPos, speedX, speedY, imgFish, frameWidth, frameHeight);
fishes.push(anotherFish);
anotherFish.drawFish();
}
animate();
}
function polyFillRAFNow() {
var w = window,
foundRequestAnimationFrame = w.requestAnimationFrame || w.webkitRequestAnimationFrame || w.msRequestAnimationFrame || w.mozRequestAnimationFrame || w.oRequestAnimationFrame || function (cb) {
setTimeout(cb, 1000 / 60);
};
window.requestAnimationFrame = foundRequestAnimationFrame;
}
}
</script>
</head>
<body>
<canvas id="pondCanvas" width="1024" height="600">
Canvas is not supported.
</canvas>
</body>
</html>
鱼类动画
画布{边框:1px实心;背景色:#efef;}
window.onload=function(){
var canvas=document.getElementById('pondCanvas');
var context=canvas.getContext('2d');
polyFillRAFNow();
var frameCount=8;
var frameWidth,frameHeight;
var frameScale=0.4;
var指数=0;
变量animFrames=[0,1,2,3,3,4,4,5,6,6,7,6,5,4,4,3,2,2,1,1];
var xPos=canvas.width/2,
yPos=画布高度/2;
var-speedX;
快速变化;
var-speedXSign;
var-speedYSign;
var=[];
另一种鱼类;
功能鱼(xPos、YPO、speedX、speedY、imgFish、帧宽、帧高){
this.image=imgFish;
this.xPos=canvas.width/2;
this.yPos=canvas.height/2;
this.speedX=speedX;
这个。迅速的=迅速的;
this.frameWidth=frameWidth;
this.frameHeight=frameHeight;
这个.frameCount=8;
这个0.frameScale=0.4;
该指数=0;
this.animFrames=[0,1,2,3,3,4,4,5,6,6,7,6,5,4,4,3,2,2,1,1];
}
Fish.prototype.changeDirection=函数(){
speedXSign=this.speedX>0?1:-1;
speedYSign=this.speedY>0?1:-1;
this.speedX=speedXSign*(1+Math.random()*1.7);
this.speedY=speedYSign*(1+Math.random()*2);
};
Fish.prototype.move=函数(){
这个.animIndex++;
如果(this.animIndex==animFrames.length)this.animIndex=0;
this.xPos+=this.speedX;
如果((this.xPos+this.frameWidth*this.frameScale/1.8)>=canvas.width |
(this.xPos-this.frameWidth*this.frameScale/1.8)=canvas.height | |
(this.yPos-this.frameHeight*frameScale/1.8)0-1:-1;
var speedYSign=this.speedY>0?1:-1;
context.scale(speedXSign,speedYSign);
var frameIndex=animFrames[this.animinindex];
context.drawImage(imgFish,frameIndex*this.frameWidth,0,frameWidth,frameHeight,
-frameWidth*frameScale/2,-this.frameHeight*this.frameScale/2,
this.frameWidth*this.frameScale,this.frameHeight*this.frameScale);
restore();
};
函数animate(){
请求动画帧(动画);
clearRect(0,0,canvas.width,canvas.height);
对于(变量i=0;i
手动添加鱼类:
HTML:
您的代码就在那里,我只是复制了它并将其放在一个偶数侦听器中。事实上,这个问题与画布无关。它是关于处理对象的。您必须将与一条鱼相关的所有数据存储在一个对象中,将鱼的所有实例存储在一个数组中,然后在此数组上迭代以更新并绘制动画中的鱼。查找有关对象和数组的教程。是的,我通过将所有函数存储到类中来处理示例代码。我刚刚将上面的代码编辑到最新版本,当我使用数组输出设置它时,它能够绘制多条鱼。但是有什么方法可以让我手动绘制它吗?请将您的move()重命名为changeDirection(),newAnimationFrame()和newAnimationFrame()来移动()。调用changeDirection,类似于:if(Math.random()>0.995)fish.changeDirection();这样它只会不时地改变。现在你的代码很完美,我不明白你的问题。1)如果你能更精确地描述“按钮或其他东西”:-)2)共享fiddle链接。
<button id="button" > Add a fish! </button>
document.getElementById("button").onclick = function() {
var anotherFish = new Fish(xPos, yPos, speedX, speedY, imgFish, frameWidth, frameHeight);
fishes.push(anotherFish);
anotherFish.drawFish();
animate();
};