如何获取路径Quartz用来描边一个NSBezierPath [英] How to get the path Quartz is using to stroke a NSBezierPath

问题描述

使用此代码用宽，虚线，黑线描绘NSBezierPath。

I'm using this code to stroke a NSBezierPath with a wide, dashed, black line.

（ c 和 strForBezier 在其他地方定义）

NSGlyph glyph;
for(n = 0; n < len; n++) {
    glyph = [font glyphWithName: [strForBezier substringWithRange:NSMakeRange(n, 1)]];
    [path appendBezierPathWithGlyph: glyph inFont: font];
}

CGFloat pattern2[4]; pattern2[0]=5*c; pattern2[1]=2*c; pattern2[2]=2*c; pattern2[3]=2*c;
[path setLineDash:pattern2 count:4 phase:0];

[path setLineWidth:c];
[path stroke];
[[NSColor blueColor] set ];
[path fill];

如何获得黑色NSBezierPath？

How can I get the black NSBezierPath ? I'm making the assumption that a NSBezierPath is built and filled to stroke the initial curve.

推荐答案

您可以通过创建一个路径来创建一个路径， dashed和抚摸现有路径，但是需要使用 CGPathRef 而不是 NSBezierPath 。

You can create a path by dashing and stroking an existing path, but that requires to use CGPathRef instead of NSBezierPath.

CGMutablePathRef path0 = CGPathCreateMutable();
CGAffineTransform transform = CGAffineTransformMakeTranslation(20, 20);
// initial position is {20, 20}

CGGlyph glyph;
for(n = 0; n < len; n++)
{
    glyph = [font glyphWithName: [strForBezier substringWithRange:NSMakeRange(n, 1)]];
    CGPathRef glyphPath = CTFontCreatePathForGlyph((__bridge CTFontRef) font, glyph, NULL);
    CGPathAddPath(path0, &transform, glyphPath);
    CGPathRelease(glyphPath);

    // append the glyph advance to the transform
    CGSize advance;
    CTFontGetAdvancesForGlyphs((__bridge CTFontRef) font, kCTFontDefaultOrientation, &glyph, &advance, 1);
    transform.tx += advance.width;
    transform.ty += advance.height;
}

CGFloat pattern2[4]; pattern2[0]=5*c; pattern2[1]=2*c; pattern2[2]=2*c; pattern2[3]=2*c;
CGPathRef path1 = CGPathCreateCopyByDashingPath(path0, NULL, 0, pattern2, 4);
CGPathRef path2 = CGPathCreateCopyByStrokingPath(path1, NULL, c, kCGLineCapButt, kCGLineJoinMiter, CGFLOAT_MAX);

CGContextRef context = [NSGraphicsContext currentContext].graphicsPort;
CGContextAddPath(context, path2);
CGContextDrawPath(context, kCGPathFill);

CGPathRelease(path0);
CGPathRelease(path1);
CGPathRelease(path2);

如果您不满意 CGPathRef ，您可以使用Apple文档中描述的方法创建 NSBezierPath ，然后将其转换为 CGPathRef 构建CGPathRef从NSBezierPath对象（也可以相反）。

If you're not comfortable with CGPathRef, you may create a NSBezierPath then convert it to a CGPathRef using the method described in Apple documentation Building a CGPathRef From a NSBezierPath Object (the reverse is also possible).

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