如何在svg中将一条路径分成两条路径 [英] how to split one path into two paths in svg

问题描述

我对 svg 语法很陌生，我想知道如何将一条路径分成两条路径.实际上我有这样的事情:

I'm very new to svg syntax and I want to know how I can split a path into two paths. actually I have something like this:

M Xm Ym ... C Xc1 Yc1 Xc2 Yc2 Xc3 Yc3 (*) C Xd1 Yd1 Xd2 Yd2 Xd3 Yd3 C ...

(*) 是我想分割路径的地方

(*) is where I want to split the path

我想把它转换成两个这样的路径:

and I want to convert it to two paths like this:

M Am Bm ... C Ac1 Bc1 Ac2 Bc2 Ac3 Bc3

和

M An Bn C Ad1 Bd1 Ad2 Bd2 Ad3 Bd3 ...

如何通过 X 和 Y 数计算 A 和 B 数?

How to calculate A and B numbers by X and Y nums?

推荐答案

如果您可以依赖绝对路径命令(即大写字母，如 'C' 而不是 'c')，那么这很容易.

If you can rely on the path commands being absolute (ie capital letters like 'C' rather than 'c'), then it is easy.

M Xm Ym ... C Xc1 Yc1 Xc2 Yc2 Xc3 Yc3 (*) C Xd1 Yd1 Xd2 Yd2 Xd3 Yd3 C ...

会变成

M Xm Ym ... C Xc1 Yc1 Xc2 Yc2 Xc3 Yc3

和

M Xc3 Yc3  C Xd1 Yd1 Xd2 Yd2 Xd3 Yd3 C ...

也就是说，只使用上一个路径命令中的最后一个坐标对.

That is, just use the last coordinate pair from the previous path command.

但是请注意，如果路径有填充，像这样拆分它可能会弄乱填充.

However be aware that, if the path has a fill, splitting it like this may mess up the fill.

如果路径有相对路径命令(例如c)——尤其是分割前的命令——那么你需要做更多的工作.您需要先计算出最后一个坐标的绝对值，然后才能在插入的 M 命令中使用它们.

If the path has relative path commands (eg. c) - particularly the command before the split - then you will need to do a lot more work. You will need to work out what that last coordinate is in absolute terms before you can use them in the inserted M command.

示例:

<svg width="200" height="200" viewBox="0 0 20 20">
  <path transform="translate(10,10)"
        d="M -10,0
           C -10,-5.5 -5.5,-10 0,-10
           C 5.5,-10 10,-5.5 10,0"/>
</svg>

<svg width="200" height="200" viewBox="0 0 20 20">
  <path transform="translate(10,10)" fill="red"
        d="M -10,0
           C -10,-5.5 -5.5,-10 0,-10"/>
  <path transform="translate(10,10)" fill="green"
        d="M 0,-10
           C 5.5,-10 10,-5.5 10,0"/>
</svg>

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