Anyone have any idea why CGContextFillPath won't work in the code snippet below? I'm using the following code to draw to a UIImageView. It's stroking the path correctly, but ignoring CGContextFillPath.
UIGraphicsBeginImageContext(self.frame.size);
[drawingView.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextSetRGBFillColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), firstMovedTouch.x, firstMovedTouch.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFillPath(UIGraphicsGetCurrentContext());
drawingView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
I think you need to call CGContextClosePath
before you can fill the path. I am not sure what you are trying to draw, but CGContextFillPath
will fill the area inside the path and I only see single line here.
To solve this problem, use the following code:
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 1.0);
CGContextSetRGBFillColor(context, 0.0, 0.0, 0.0, 1.0);
CGContextSetLineJoin(context, kCGLineJoinRound);
CGContextSetLineWidth(context, 8.0);
CGMutablePathRef pathRef = CGPathCreateMutable();
/* do something with pathRef. For example:*/
CGPathMoveToPoint(pathRef, NULL, x, y);
CGPathAddLineToPoint(pathRef, NULL, x, y+100);
CGPathAddLineToPoint(pathRef, NULL, x+100, y+100);
CGPathAddLineToPoint(pathRef, NULL, x+100, y);
CGPathCloseSubpath(pathRef);
CGContextAddPath(context, pathRef);
CGContextFillPath(context);
CGContextAddPath(context, pathRef);
CGContextStrokePath(context);
CGPathRelease(pathRef);
I believe that the best way to stroke and fill your path is to add the following line of code after you've finished setting up your path:
CGContextDrawPath(myContext, kCGPathFillStroke);
I had the same trouble. I found that you can not use
CGContextStrokePath( UIGraphicsGetCurrentContext() )
CGContextFillPath( UIGraphicsGetCurrentContext() )
consecutively: the latter will not work because after committing the stroke on the path, the path is removed from the context.
So, I used the same path twice; one for stroke,the other for fill.
// ... create a path of CGMutablePathRef ....
CGContextSaveGState( context );
//....fill the path .....
CGContextRestoreGState( context );
CGContextSaveGState ( context );
//....stroke the path .....
CGContextRestoreGState( context );
CFRelease( path );
来源:https://stackoverflow.com/questions/3808984/cgcontext-line-drawing-cgcontextfillpath-not-working