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我使用下面的代码来填充颜色iPhone的图像在图像的一部分。如何填充颜色只在在iPhone
- (UIImage *)colorizeImage:(UIImage *)baseImage color:(UIColor *)theColor {
UIGraphicsBeginImageContext(baseImage.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGRect area = CGRectMake(0, 0, baseImage.size.width, baseImage.size.height);
CGContextScaleCTM(ctx, 1, -1);
CGContextTranslateCTM(ctx, 0, -area.size.height);
CGContextSaveGState(ctx);
CGContextClipToMask(ctx, area, baseImage.CGImage);
[theColor set];
CGContextFillRect(ctx, area);
CGContextRestoreGState(ctx);
CGContextSetBlendMode(ctx, kCGBlendModeMultiply);
CGContextDrawImage(ctx, area, baseImage.CGImage);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
但上面的代码填充整个图像中的颜色。我只想感受上半部分,比如图像的1/4。那么该怎么做呢?
我想通了.. 变化CGContextFillRect到的线。 CGContextFillRect(ctx,CGRectMake(0,0,baseImage.size.width,100)); – rkb 2009-07-29 18:17:52