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如果我正在做一個簡單的繪圖,並且想要更改某些子路徑的線寬/短劃線,那麼如何在不更改所有路徑的情況下實現這一點?我嘗試了一些使用CGContextSaveGState(context)的變體;但不能完全正確。這是否必須是完全不同的路徑?我真的希望他們不要畫陰影。繪製子路徑時CG更改/保存環境
- (void)drawPitch:(CGContextRef)context {
// Push the context onto the stack
UIGraphicsPushContext(context);
//Reasonable defaults
CGRect pitchRect = CGRectMake(10, 10, 220, 344);
CGSize myShadowOffset = CGSizeMake(0,1);
float myColorValues[] = {0, 0, 0, 0.75};
CGColorRef myColor;
CGColorSpaceRef myColorSpace;
//Color Space
myColorSpace = CGColorSpaceCreateDeviceRGB();
myColor = CGColorCreate (myColorSpace, myColorValues);
// Set Stroke
CGContextSetRGBStrokeColor(context, 1, 1, 1, 0.9);
CGContextSetLineWidth(context, 4);
// Pitch Outline at width:4
CGContextAddRect(context, pitchRect);
CGContextSaveGState(context);
// Want this to be set width:2 just for the subpath
CGContextSetLineWidth(context, 2);
CGContextMoveToPoint(context, CGRectGetMinX(pitchRect), CGRectGetMinY(pitchRect) + (pitchRect.size.height * 0.50));
CGContextAddLineToPoint(context, CGRectGetMaxX(pitchRect), CGRectGetMinY(pitchRect) + (pitchRect.size.height * 0.50));
CGContextRestoreGState(context);
// Set Line Shadow
CGContextSetShadowWithColor(context, myShadowOffset, 10, myColor);
// Stroke path
CGContextStrokePath(context);
// Pop the contect back on the stack
UIGraphicsPopContext();
}