我正在尝试使此雨滴画布脚本占用100%的宽度和高度,但我似乎无能为力。我尝试更改CSS以及“画布”区域中的高度/宽度,但是它要么什么都没有改变,要么根本不起作用。一次我尝试将其实际放大的东西,似乎对雨滴产生了怪异的影响,它们变得模糊并且变大了,因此它实际上必须拉长了画布而不是使其变大了。这是默认的800x800像素画布的代码。
风格
<style>
article, aside, figure, footer, header, hgroup,
menu, nav, section { display: block; }
</style>
画布脚本
<script type="text/javascript">
var canvas = null;
var context = null;
var bufferCanvas = null;
var bufferCanvasCtx = null;
var flakeArray = [];
var flakeTimer = null;
var maxFlakes = 200; // Here you may set max flackes to be created
function init() {
canvas = document.getElementById('canvasRain');
context = canvas.getContext("2d");
bufferCanvas = document.createElement("canvas");
bufferCanvasCtx = bufferCanvas.getContext("2d");
bufferCanvasCtx.canvas.width = context.canvas.width;
bufferCanvasCtx.canvas.height = context.canvas.height;
flakeTimer = setInterval(addFlake, 200);
Draw();
setInterval(animate, 30);
}
function animate() {
Update();
Draw();
}
function addFlake() {
flakeArray[flakeArray.length] = new Flake();
if (flakeArray.length == maxFlakes)
clearInterval(flakeTimer);
}
function blank() {
bufferCanvasCtx.fillStyle = "rgba(0,0,0,0.8)";
bufferCanvasCtx.fillRect(0, 0, bufferCanvasCtx.canvas.width, bufferCanvasCtx.canvas.height);
}
function Update() {
for (var i = 0; i < flakeArray.length; i++) {
if (flakeArray[i].y < context.canvas.height) {
flakeArray[i].y += flakeArray[i].speed;
if (flakeArray[i].y > context.canvas.height)
flakeArray[i].y = -5;
flakeArray[i].x += flakeArray[i].drift;
if (flakeArray[i].x > context.canvas.width)
flakeArray[i].x = 0;
}
}
}
function Flake() {
this.x = Math.round(Math.random() * context.canvas.width);
this.y = -10;
this.drift = Math.random();
this.speed = Math.round(Math.random() * 5) + 1;
this.width = (Math.random() * 3) + 2;
this.height = this.width;
}
function Draw() {
context.save();
blank();
for (var i = 0; i < flakeArray.length; i++) {
bufferCanvasCtx.fillStyle = "white";
bufferCanvasCtx.fillRect(flakeArray[i].x, flakeArray[i].y, flakeArray[i].width, flakeArray[i].height);
}
context.drawImage(bufferCanvas, 0, 0, bufferCanvas.width, bufferCanvas.height);
context.restore();
}
</script>
最后是身体
<body onload="init()">
<canvas id="canvasRain" width="800px" height="800px">Canvas Not Supported</canvas>
</body>
body, #canvasRain {width:100%; height:100%; margin:0px;}
会正确设置您的尺寸,但是您的问题是,用于绘制图形的画布高度/宽度在使用px
%的值设置时无法获得正确的值。那就是模糊鳞片带来缩放的地方。它需要一些默认的画布大小,并且可以拉伸到视图的100%。添加类似
bufferCanvas.width = canvas.width = window.innerWidth;
bufferCanvas.height = canvas.height = window.innerHeight;
似乎可以解决问题。您可能希望/需要处理调整大小事件以重新计算它。这是一个样本。我无法让jsFiddle为我工作,所以这就是全部。
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