iOS UIBezierPath,遵循字体的形状

Question

我是一个iOS新手.如何使我遵循字母表的UIBezierPath说"B".目标是跟踪沿此路径的接触.

提前致谢.

Answer 1

CoreText.framework提供了获取单词路径的方法

见http://www.codeproject.com/Articles/109729/Low-level-text-rendering

代码示例由Ole Begemann创建.对不起,我忘了为名为AnimatedPath的演示下载网址.

CGMutablePathRef letters = CGPathCreateMutable();

CTFontRef font = CTFontCreateWithName(CFSTR("Helvetica-Bold"), 72.0f, NULL);
NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys:
                       (id)font, kCTFontAttributeName,
                       nil];
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"Hello World!"
                                                                 attributes:attrs];
CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)attrString);
CFArrayRef runArray = CTLineGetGlyphRuns(line);

// for each RUN
for (CFIndex runIndex = 0; runIndex < CFArrayGetCount(runArray); runIndex++)
{
    // Get FONT for this run
    CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
    CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);

    // for each GLYPH in run
    for (CFIndex runGlyphIndex = 0; runGlyphIndex < CTRunGetGlyphCount(run); runGlyphIndex++) 
    {
        // get Glyph & Glyph-data
        CFRange thisGlyphRange = CFRangeMake(runGlyphIndex, 1);
        CGGlyph glyph;
        CGPoint position;
        CTRunGetGlyphs(run, thisGlyphRange, &glyph);
        CTRunGetPositions(run, thisGlyphRange, &position);

        // Get PATH of outline
        {
            CGPathRef letter = CTFontCreatePathForGlyph(runFont, glyph, NULL);
            CGAffineTransform t = CGAffineTransformMakeTranslation(position.x, position.y);
            CGPathAddPath(letters, &t, letter);
            CGPathRelease(letter);
        }
    }
}
CFRelease(line);

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointZero];
[path appendPath:[UIBezierPath bezierPathWithCGPath:letters]];

CGPathRelease(letters);
CFRelease(font);

用"你需要的词"取代"Hello World!".

Answer 2

对于 Quartz2D 中的绘图，我使用名为 PaintCode ( http://www.paintcodeapp.com/ )的 OSX 应用程序。它基本上是一个矢量绘图应用程序，可以生成您所做的绘图的石英代码。实际上它\xc2\xb4 非常棒。有一个类似的应用程序称为 Opacity 但我还没有尝试过。

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使用此类应用程序，您可以在背景上设置 B 作为引导，并在其上绘制 BezierPath。一旦你\xc2\xb4完成，只需复制生成的代码并将其粘贴到你的项目中。

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希望能帮助到你。

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