问题:
缩小图像进行裁剪就可以了。
放大图像后进行裁剪会显示应有的图像上方的图像。
我在那里的 yOffset 是因为我想要的裁剪方块从滚动视图的下方开始。
Code:
CGRect rect;
float yOffset = 84;
rect.origin.x = floorf([scrollView contentOffset].x * zoomScale);
rect.origin.y = floorf(([scrollView contentOffset].y + yOffset) * zoomScale);
rect.size.width = floorf([scrollView bounds].size.width * zoomScale);
rect.size.height = floorf((320 * zoomScale));
if (rect.size.width > 320) {
rect.size.width = 320;
}
if (rect.size.height > 320) {
rect.size.height = 320;
}
CGImageRef cr = CGImageCreateWithImageInRect([[imageView image] CGImage], rect);
UIImage *img = imageView.image; //[UIImage imageWithCGImage:cr];
UIGraphicsBeginImageContext(rect.size);
// translated rectangle for drawing sub image
CGRect drawRect = CGRectMake(-rect.origin.x, -rect.origin.y, 320.0f, 320.0f);
NSLog(@"drawRect: %@", NSStringFromCGRect(drawRect));
NSLog(@"rect: %@", NSStringFromCGRect(rect));
// draw image
[img drawInRect:drawRect];
// grab image
UIImage *cropped = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGImageRelease(cr);
[self.delegate imageCropper:self didFinishCroppingWithImage:cropped];
我在做什么导致图像在缩放时获得错误的高度?
UIImage* imageFromView(UIImage* srcImage, CGRect* rect)
{
CGImageRef cr = CGImageCreateWithImageInRect(srcImage.CGImage, *rect);
UIImage* cropped = [UIImage imageWithCGImage:cr];
CGImageRelease(cr);
return cropped;
}
-(void) doneEditing
{
//Calculate the required area from the scrollview
CGRect visibleRect;
float scale = 1.0f/scrollView.zoomScale;
visibleRect.origin.x = scrollView.contentOffset.x * scale;
visibleRect.origin.y = scrollView.contentOffset.y * scale;
visibleRect.size.width = scrollView.bounds.size.width * scale;
visibleRect.size.height = scrollView.bounds.size.height * scale;
FinalOutputView* outputView = [[FinalOutputView alloc] initWithNibName:@"FinalOutputView" bundle:[NSBundle mainBundle]];
outputView.image = imageFromView(imageView.image, &visibleRect);
[self.navigationController pushViewController:outputView animated:YES];
[outputView release];
}
加载原始图像:
缩放图像:
最终捕获图像
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)