svg - 为什么 svg 字体是镜像的？

Question

我有带有元素 <path d="..." /> 的 SVG 文件

我将该文件转换为 SVG 字体:

<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg">
    <defs>
        <font id="somefont" horiz-adv-x="1000">
            <font-face font-family="somefont" units-per-em="1000"/>
            <glyph unicode="a" d="..."/>
        </font>
    </defs>
</svg>

属性 d未更改，但字体由 x 轴镜像。

为什么会发生这种情况以及如何解决？

Answer 1

"Unlike standard graphics in SVG, where the initial coordinate system has the y-axis pointing downward (see The initial coordinate system), the design grid for SVG fonts, along with the initial coordinate system for the glyphs, has the y-axis pointing upward for consistency with accepted industry practice for many popular font formats."

来源: http://www.w3.org/TR/SVG/fonts.html