iPhone - 将 UIBezierPath 复制到 CGPath 并渲染为原始路径

发布于 2024-11-14 17:36:12 字数 389 浏览 4 评论 0原文

我创建了一个复杂的 UIBezierPath，它由多个路径段、实线、虚线、线条、颜色、弧线等组成。所以我有了这个，现在我想将其渲染到 CGContext。

因此，我将其转换为 CGPathReference 使用

CGPathRef cgPath = CGPathCreateCopy(aBezierPath.CGPath);

问题是这样的：理论上，如果我想在 CGContext 上绘制路径，我必须为每个片段定义笔划宽度、颜色、线条样式、混合模式等。需要不同，但我已经创建的 UIBezierPath 包含所有这些信息。

所以，我想知道是否有一种方法可以像在 CGContext 上一样“标记”CGPath，这样它就会被标记所有原始信息？

谢谢。

原文

I have created a complex UIBezierPath that is composed of several path segments, solid, dashed, lines, colors, arcs, etc. So I have this and now I want to render it to a CGContext.

So, I convert it to a CGPathReference using

CGPathRef cgPath = CGPathCreateCopy(aBezierPath.CGPath);

The problem is this: in theory, if I want to draw a path on a CGContext, I have to define the stroke width, color, line style, blending mode, etc. for each segment that needs to be different, but the UIBezierPath I have already created contains all this information.

So, I wonder if there is a way to just to "stamp" the CGPath as it is on the CGContext, so it will be stamped with all the original information?

thanks.

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寄离 2024-11-21 17:36:12

博士，你是对的：这非常令人困惑！

但我认为Tom是正确的，只需使用[aBezierPath描边]即可。

因此，它会是这样的：

REF 是您构建的 (CGContextRef)。

YOURBEZIERPATH 是 (UIBezierPath*)。

不可避免地，你必须处理“颠倒绘图”的问题，所以：

UIGraphicsPushContext(REF);
CGContextSaveGState(REF);
CGContextTranslateCTM(REF, 0, the height*);
CGContextScaleCTM(REF, 1.0, -1.0);
[YOURBEZIERPATH stroke];
CGContextRestoreGState(REF);
UIGraphicsPopContext();

就是这样。

回复下面的评论：我有一个 UIBezierPaths 数组。每个贝塞尔曲线都有自己的风格和颜色。

这有帮助吗？ ...用 for 循环替换一个“笔划”调用：

UIGraphicsPushContext(REF);
CGContextSaveGState(REF);
CGContextTranslateCTM(REF, 0, the height*);
CGContextScaleCTM(REF, 1.0, -1.0);

for each of YOURBEZIERPATH in your array...
    {
    CGContextSaveGState(REF);
    [YOURBEZIERPATH stroke];
    CGContextRestoreGState(REF);
    }

CGContextRestoreGState(REF);
UIGraphicsPopContext();

您实际上不需要费心使用 aBezierPath.CGPath 或其副本。

你又说对了，UI 和 CG 的两个世界非常令人困惑！

*高度：通常类似于 self.frame.size.height。我只是为将来寻找通用示例代码的人提供此内容。

DR, you're right: it is very confusing!

But I think Tom is correct, just use [aBezierPath stroke].

So, it would be something like this:

REF is a (CGContextRef) which you have built.

YOURBEZIERPATH is a (UIBezierPath*).

Inevitably you have to deal with the "drawing upside down" issue, so:

UIGraphicsPushContext(REF);
CGContextSaveGState(REF);
CGContextTranslateCTM(REF, 0, the height*);
CGContextScaleCTM(REF, 1.0, -1.0);
[YOURBEZIERPATH stroke];
CGContextRestoreGState(REF);
UIGraphicsPopContext();

So that's it.

Re your comment below: I have an array of UIBezierPaths. Each bezier has its own style and color.

Does this help? ... Replace the one "stroke" call, with a for loop:

UIGraphicsPushContext(REF);
CGContextSaveGState(REF);
CGContextTranslateCTM(REF, 0, the height*);
CGContextScaleCTM(REF, 1.0, -1.0);

for each of YOURBEZIERPATH in your array...
    {
    CGContextSaveGState(REF);
    [YOURBEZIERPATH stroke];
    CGContextRestoreGState(REF);
    }

CGContextRestoreGState(REF);
UIGraphicsPopContext();

You actually do not need to bother using aBezierPath.CGPath, or, a copy thereof.

Again you are right, it is very confusing, the two worlds of UI and CG !!

*the height: often something like self.frame.size.height. I just include this for anyone looking for general example code in the future.

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