[编辑尝试不同的效果]
这是尝试使用多个阴影来巩固 AA
http://jsfiddle.net/m1erickson/BSU7P/
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; }
canvas{border:1px solid red;}
</style>
<script>
$(function(){
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
// Load background
var bg = new Image();
bg.onload = function() {
canvas.width = this.width;
canvas.height = this.height;
ctx.drawImage(this, 0, 0);
process();
};
bg.src = "http://upload.robrowser.com/bg-test-text.jpg";
function process() {
var x = canvas.width /2;
var y = canvas.height/2;
ctx.font="12px Arial";
try1(x,y);
try2(x,y+20);
}
function try1(x,y){
multiShadow("HappyEnd",x,y,0,-1,0);
multiShadow("HappyEnd",x,y,0,1,0);
multiShadow("HappyEnd",x,y,-1,0,0);
multiShadow("HappyEnd",x,y,1,0,0);
ctx.fillStyle="white";
ctx.strokeStyle="black";
ctx.strokeText("HappyEnd",x,y);
ctx.fillText("HappyEnd",x,y);
}
function try2(x,y){
multiShadow("HappyEnd",x,y,0,-1.5,8);
multiShadow("HappyEnd",x,y,0,1.5,8);
multiShadow("HappyEnd",x,y,-1.5,0,8);
multiShadow("HappyEnd",x,y,1.5,0,8);
ctx.fillStyle="white";
ctx.fillText("HappyEnd",x,y);
}
function multiShadow(text,x,y,offsetX,offsetY,blur){
ctx.textBaseline = "top";
ctx.lineWidth = 1;
ctx.shadowColor = '#000';
ctx.shadowBlur = blur;
ctx.shadowOffsetX = offsetX;
ctx.shadowOffsetY = offsetY;
ctx.fillStyle="black";
ctx.fillText( "HappyEnd", x, y );
}
}); // end $(function(){});
</script>
</head>
<body>
<canvas id="canvas" width=300 height=300></canvas>
</body>
</html>