Objective-C中CALayer中的繪製圓弧和矩形

我遇到了一個問題，以向用戶展示同一個CALayer中的圓弧和矩形。我成功繪製兩者，但只有當弧線相同或在直線座標上方繪製時才顯示矩形。Objective-C中CALayer中的繪製圓弧和矩形

任何想法我想念什麼？

-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)p_contex 
{ 
    CGMutablePathRef thePath = CGPathCreateMutable(); 
    CGPathMoveToPoint(thePath,NULL,mReference.x,mReference.y); 
    CGPathAddArc(thePath,NULL, 
       mReference.x, mReference.y, 
       S_RADIO, lStartAngle, lStopAngle , 
       0); 
    CGPathCloseSubpath(thePath); 

    CGContextSetRGBFillColor(p_contex, lRed,lGreen,lBlue,lAlpha); 
    CGContextSetRGBStrokeColor(p_contex, lRed,lGreen,lBlue,lAlpha); 
    CGContextAddPath(p_contex, thePath); 

    CGContextSaveGState(p_contex); 
    CGContextClip(p_contex); 
    CGContextDrawRadialGradient(p_contex, 
           [self buildGradientColor], 
           mReference , 5, mReference, S_RADIO, 0); 

    CGContextSaveGState(p_contex); 

    // release the path 
    CFRelease(thePath); 
    CGGradientRelease(mGradient); 


    CGMutablePathRef retPath = CGPathCreateMutable(); 
    CGRect rect = CGRectMake(0,300, 200, 40); 
    float radius = 10; 
    CGRect innerRect = CGRectInset(rect, radius, radius); 

    CGFloat inside_right = innerRect.origin.x + innerRect.size.width; 
    CGFloat outside_right = rect.origin.x + rect.size.width; 
    CGFloat inside_bottom = innerRect.origin.y + innerRect.size.height; 
    CGFloat outside_bottom = rect.origin.y + rect.size.height; 

    CGFloat inside_top = innerRect.origin.y; 
    CGFloat outside_top = rect.origin.y; 
    CGFloat outside_left = rect.origin.x; 

    CGPathMoveToPoint(retPath, NULL, innerRect.origin.x, outside_top); 

    CGPathAddLineToPoint(retPath, NULL, inside_right, outside_top); 
    CGPathAddArcToPoint(retPath, NULL, outside_right, outside_top, outside_right, inside_top, radius); 
    CGPathAddLineToPoint(retPath, NULL, outside_right, inside_bottom); 
    CGPathAddArcToPoint(retPath, NULL, outside_right, outside_bottom, inside_right, outside_bottom, radius); 

    CGPathAddLineToPoint(retPath, NULL, innerRect.origin.x, outside_bottom); 
    CGPathAddArcToPoint(retPath, NULL, outside_left, outside_bottom, outside_left, inside_bottom, radius); 
    CGPathAddLineToPoint(retPath, NULL, outside_left, inside_top); 
    CGPathAddArcToPoint(retPath, NULL, outside_left, outside_top, innerRect.origin.x, outside_top, radius); 

    CGPathCloseSubpath(retPath); 


    CGContextAddPath(p_contex, retPath); 
    CGContextFillPath(p_contex); 
    }

來源

2012-06-02 Agus

這裏的問題是，你畫一個弧線，然後填充rectagle 所以電弧越來越繪製此填充矩形

一個快速的解決辦法是拉伸後的圓弧繪製移動背後的矩形在繪製矩形之後移動弧的繪圖

來源

2012-06-02 00:29:02

太好了，你知道爲什麼嗎？我的意思是，背後的邏輯是什麼？ – Agus

那麼我想你畫的矩形是填充的，所以它重疊並覆蓋舊弧:) –

Objective-C中CALayer中的繪製圓弧和矩形

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