Core Graphics Extra Convenience Functions

CoreGraphicsCMExtras.c

/*
 Example:
 
	CGRect fillRect = CGRectMake(0.0, 0.0, 50.0, 100.0);
	size_t locationCount = 2;
	CGFloat locationList[] = {0.0, 1.0};
	CGFloat colorList[] = {
		//red, green, blue, alpha 
		244.0/255.0, 207.0/255.0, 80.0/255.0, 1.0,
		255.0/255.0, 161.0/255.0, 59.0/255.0, 1.0,
	};
	CGContextGradientFillRect(c, fillRect, locationList, locationCount, colorList);
 */
void
CGContextGradientFillRect(CGContextRef c, CGRect fillRect, CGFloat *locationList, size_t locationCount, CGFloat *colorList)
{
	CGContextSaveGState(c);
	CGContextAddRect(c, fillRect);
	CGContextClip(c);
	
	CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
	CGGradientRef myGradient = CGGradientCreateWithColorComponents(rgbColorSpace, colorList, locationList, locationCount);
	CGPoint startPoint = CGPointMake(CGRectGetMinX(fillRect), CGRectGetMinY(fillRect));
	CGPoint endPoint = CGPointMake(CGRectGetMinX(fillRect), CGRectGetMaxY(fillRect));
	CGContextDrawLinearGradient(c, myGradient, startPoint, endPoint, 0);
	CGGradientRelease(myGradient);
	CGColorSpaceRelease(rgbColorSpace);
	
	CGContextRestoreGState(c);

}