CODEWITHSUNDEEP
objective-cioscocoa-touchgraphicscgcontext
Kardasis
Kardasis

Reputation: 941

How does CGContextFillPath in Objective C work?

I have the following code which is supposed to draw a stroked and filled rectangle but the fill won't show up. 

    [[UIColor greenColor] setStroke];
    [[UIColor brownColor] setFill];

    CGContextBeginPath(context);
    CGContextMoveToPoint(context, right, bottom);
    CGContextAddLineToPoint(context, right,top);
    CGContextAddLineToPoint(context,left, top);
    CGContextAddLineToPoint(context, left, bottom);
    CGContextAddLineToPoint(context, right, bottom);

    CGContextStrokePath(context);
    CGContextFillPath(context);

The stroke works and I get a nice green rectangle with no fill (or a white fill). This is within a UIView for iOS. Seems very simple and it's driving me nuts!

Upvotes: 2

Views: 3030

Answers (3)

Eli
Eli

Reputation: 4932

The right way to do this is to set the drawing mode to include both a fill and a path.

CGPathDrawingMode mode = kCGPathFillStroke;
CGContextClosePath( context ); //ensure path is closed, not necessary if you know it is
CGContextDrawPath( context, mode );

You can use CGContextFillPath() to simply do a fill, but it's basically just CGContextDrawPath() that automatically calls CGContextClosePath() and uses kCGPathFill as the CGPathDrawingMode. You might as well always use CGContextDrawPath() and put in your own parameters to get the type of fill/stroke that you want. You can also put holes in convex paths by using one of the Even-Odd drawing modes.

Upvotes: 6

zahreelay
zahreelay

Reputation: 1742

Probably you should call CGContextClosePath before you call CGContextFillPath

Upvotes: 0

Brian
Brian

Reputation: 15706

From the docs on CGContextStrokePath:

Quartz uses the line width and stroke color of the graphics state to paint the path. As a side effect when you call this function, Quartz clears the current path.

Upvotes: 3

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