SVG的precision坐标？ [英] Precision of SVG coordinates?

问题描述

有谁知道SVG的官方precision在浏览器中的坐标？

Does anyone know the "official" precision of SVG coordinates in browsers?

例如：如果我画弧几乎360°它最终会消失，因为开始和结束的崩溃。

For example: If I draw an arc with almost 360° it will eventually disappear because start and end are collapsing.

<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
    <style>
        path {
            stroke-width: 10px;
            stroke: black;
            fill: none;
        }
    </style>
    <path 
        d="
        M 200 200
        A 100 100 0 1 1 199.99999 199.99999"
    />
</svg>

画一个完美的圆圈（在Firefox 34）。然而，加入 9 到 199.99999 收益率没有被绘制。被指定的任何地方这种行为？

draws a perfect circle (in Firefox 34). However, adding a 9 to 199.99999 yields to nothing being drawn. Is this behavior specified anywhere?

推荐答案

SVG规范说的双击precision 。没有UA实现这个虽然因为它们都通过平台的能力，如Direct3D的这一般都是单件precision制约。

The SVG specification says double precision. No UA implements this though because they are all constrained by platform capabilities such as direct3d which are generally single precision.

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