Change RGBStrokeColor mid-path

[architectpianist]

Hi,
I'm trying to draw a quadratic bezier curve to the screen, with a line connecting the two endpoints below. My current code is as follows:

CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 1.0);
			CGContextSetLineWidth(context, 3.0);
			CGContextBeginPath(context);
			CGContextMoveToPoint(context, [[beginPointsXQuad objectAtIndex:index] floatValue], 
								 [[beginPointsYQuad objectAtIndex:index] floatValue]);
			CGContextAddQuadCurveToPoint(context, [[controlPointsXQuad objectAtIndex:index] floatValue], 
										 [[controlPointsYQuad objectAtIndex:index] floatValue], 
										 [[endPointsXQuad objectAtIndex:index] floatValue], 
										 [[endPointsYQuad objectAtIndex:index] floatValue]);
			CGContextStrokePath(context); //????
			
			CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
			CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
			CGContextSetLineWidth(context, 4.0);
			CGContextAddLineToPoint(context, [[beginPointsXQuad objectAtIndex:index] floatValue], 
									[[beginPointsYQuad objectAtIndex:index] floatValue]);
			CGContextClosePath(context);  //????
			CGContextDrawPath(context, kCGPathFillStroke); //????

As you may be able to tell, I want the curve to be outlined in black and the bottom line to be outlined in white, the fill being white. It doesn't seem to work to stroke path and then do some more stuff. So how can I merge the two colors, or do I have to "cheat?"

[Duncan C]

Originally Posted by architectpianist

Hi,
I'm trying to draw a quadratic bezier curve to the screen, with a line connecting the two endpoints below. My current code is as follows:

CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 1.0);
			CGContextSetLineWidth(context, 3.0);
			CGContextBeginPath(context);
			CGContextMoveToPoint(context, [[beginPointsXQuad objectAtIndex:index] floatValue], 
								 [[beginPointsYQuad objectAtIndex:index] floatValue]);
			CGContextAddQuadCurveToPoint(context, [[controlPointsXQuad objectAtIndex:index] floatValue], 
										 [[controlPointsYQuad objectAtIndex:index] floatValue], 
										 [[endPointsXQuad objectAtIndex:index] floatValue], 
										 [[endPointsYQuad objectAtIndex:index] floatValue]);
			CGContextStrokePath(context); //????
			
			CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
			CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
			CGContextSetLineWidth(context, 4.0);
			CGContextAddLineToPoint(context, [[beginPointsXQuad objectAtIndex:index] floatValue], 
									[[beginPointsYQuad objectAtIndex:index] floatValue]);
			CGContextClosePath(context);  //????
			CGContextDrawPath(context, kCGPathFillStroke); //????

As you may be able to tell, I want the curve to be outlined in black and the bottom line to be outlined in white, the fill being white. It doesn't seem to work to stroke path and then do some more stuff. So how can I merge the two colors, or do I have to "cheat?"

If I remember correctly, paths don't save a color. They use the attributes of the current pen (size and color, stipple pattern, etc.). You'll have to break the path into 2 in order to draw it in different parts.