我正在尝试制作人造的像素化世界地图动画，以便它在不同颜色之间平滑过渡。我本来是用jquery和table来做的，但是cpu的使用率很高，所以我想我可以尝试用html5 canvas代替。但是，我仍然为此获得非常高的cpu使用率。我想知道它是否在代码中的大数组（我用来指示应该在哪里填充正方形）。任何帮助将不胜感激。
<!DOCTYPE html>
<html>
<head>
<title>canvas version</title>
<script src="raphael.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
</head>
<body>
<div id="canvasesdiv" style="position:relative; width:864px; height:456px">
<canvas id="world-map" width="864" height="456" style="position:absolute; left:0px; top:0px; z-index:1;">
</canvas>
<canvas id="backdrop" width="864" height="456" style="position:absolute; left:0px; top:0px; z-index:0;"></canvas>
<script type="text/javascript">
//declare vars
var ctx1
var ctx2
var layer1
var layer2
var red = 255;
var dr = 1;
//initialization
function init() {
layer1 = document.getElementById("backdrop");
ctx1 = layer1.getContext("2d");
//layer2 = document.getElementById("world-map");
//ctx2 = layer2.getContext("2d");
drawMap(red);
setInterval(function(){red = drawMap(red);},1);
}
//LOOP THROUGH THE ARRAY IT SHOULD BE 38 ROWS EACH WITH 72 COLUMN ENTRIES make each one 12x12 and then fill according to array non zero entries
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//Draw the map and animate the background in red only for now
function drawMap(){
ctx1.clearRect(0,0, 864, 456);
red -= dr
if (red < 0 || red > 255){
dr = -dr
}
ctx1.fillStyle = 'rgb('+red+',0,0)';
ctx1.strokeStyle = '#000';
for (var row = 0; row < 38; row+=1){
for (var col = 0; col < 72; col+=1){
if (array[row][col] != 0.0){
ctx1.fillRect(col*12,row*12,12,12);
ctx1.strokeRect(col*12,row*12,12,12);
}
}
}
return red;
}
init();
</script>
</div>
</body>
</html>
最佳答案
这是我修改您的代码的方法。主要变化：
不要尽可能快地调用drawMap，而应以30fps的速度（在实践中略微降低）而达到最大值。
仅一次计算xy偏移量（跳过零）。这大大缩短了您在drawMap中循环的迭代次数。 （〜970对2700）
使用drawMap是闭包的事实直接修改red而不需要返回/分配它。
删除12的硬编码，而不是让您在一处设置squareSize并相应地更新代码和画布。
将每“帧”的偏移量更改为5而不是1以解决较低的fps。实际上，最好的选择是指定redPerSecond变量并计算对drawMap的调用之间的帧间延迟，以使色彩脉冲以相同的世界速度发生，而不管帧速率如何。
从地图数组中删除所有小数，以获取较短的代码，并引入合理的换行符，以使我的文本编辑器不会哭泣。
每次调用strokeStyle时都无需将drawMap()设置为相同的值。
var map = [
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,21,22,0,0,25,26,27,28,29,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,18,19,20,21,22,23,24,25,26,27,28,29,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,0,0,0,12,13,14,15,16,17,18,19,0,0,22,23,24,25,26,27,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,44,45,46,47,48,49,50,0,0,53,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,0,22,23,24,25,26,0,0,0,0,0,0,33,34,35,36,37,0,0,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,0,0,0,0,0,0,0,0,0,0,0],
[0,0,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,0,22,23,0,0,0,27,28,0,0,0,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,0,0,0,0,0,0,0,0,0],
[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,0,0,0,0,0,0,0,0,0,0,0,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,0,0,0,0,0,0,0,0,0,0,0],
[0,1,2,0,0,0,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,0,0,0,0,0,0,0,0,0,30,0,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,0,0,0,60,0,0,0,0,0,0,0,0,0,0,0],
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[0,0,0,0,0,0,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,0,0,0,0,0,0,0,0,0,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,5,6,7,8,9,10,11,12,13,14,15,16,17,18,0,0,0,0,0,0,0,0,0,0,0,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,0,0,0,0,0,0,0,0,0,0,0,0],
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];
var squareSize = 12;
var nonZeroIndices = [];
var rows = map.length, cols=map[0].length;
for (var row=0; row<rows; ++row){
for (var col=0; col<cols; ++col){
if (map[row][col]) nonZeroIndices.push( [col*squareSize,row*squareSize] );
}
}
var nonZeroes = nonZeroIndices.length;
window.onload = function(){
var layer1 = document.getElementById("backdrop");
var ctx1 = layer1.getContext('2d');
var red=255, offset=5;
var w = layer1.width = map[0].length * squareSize;
var h = layer1.height = map.length * squareSize;
ctx1.strokeStyle = '#000';
var drawMap = function(){
ctx1.clearRect(0,0,w,h);
red -= offset;
ctx1.fillStyle = 'rgb('+red+',0,0)';
for (var i=0; i<nonZeroes; ++i){
var xy = nonZeroIndices[i];
ctx1.fillRect(xy[0],xy[1],squareSize,squareSize);
ctx1.strokeRect(xy[0],xy[1],squareSize,squareSize);
}
if (red<0 || red>255) offset *= -1;
};
setInterval( drawMap, 1000/30 );
};<div id="canvasesdiv" style="position:relative; width:864px; height:456px">
<canvas id="world-map" width="864" height="456" style="position:absolute; left:0px; top:0px; z-index:1;"></canvas>
<canvas id="backdrop" width="864" height="456" style="position:absolute; left:0px; top:0px; z-index:0;"></canvas>
</div>