我在向用户展示弧线然后在同一CALayer中显示矩形时遇到问题。我成功绘制了两者,但仅当圆弧相同或在矩形坐标上方绘制时才显示矩形。
知道我错过了什么吗?
-(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);
}
最佳答案
这里的问题是先绘制圆弧,然后绘制填充的矩形
所以弧线被绘制在这个填充矩形的后面
一种快速的解决方法是在绘制矩形之后移动弧的绘制
在绘制矩形之后移动弧的绘制
关于objective-c - 在Objective-C中的CALayer中绘制圆弧和矩形,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10858850/