相关疑难解决方法(0)

我正在尝试用画布绘制二次曲线.这是代码:
HTML:

<canvas id="mycanvas"> 
    Your browser is not supported.
</canvas> 

JavaScript的:

var canvas = document.getElementById("mycanvas");
canvas.style.width = "1000px";
canvas.style.height = "1000px";
if (canvas.getContext) {
    var ctx = canvas.getContext("2d");
    var x = 0,
        y = 0;
    setInterval(function() {
        ctx.lineTo(x, y);
        ctx.stroke();
        x += 1;
        y = 0.01 * x * x;
    }, 100);
}

但结果真的很难看,首先,线条太粗,第二,别名是如此明显......我怎么能改善呢？
你可以在这里看到效果:http://jsfiddle.net/7wNmx/1/