当从中心裁剪图像时,裁剪图像将采用源图像的宽高比,但是根据我的要求,宽高比将随着新的裁剪尺寸而变化。
我想使用新的长宽比获得图像的确切中心部分。例如,一张大图像的尺寸为(320 * 480),然后我想要裁剪图像的中心部分的尺寸为(100,100),长宽比也将为100 * 100 ,不需要外部白色或黑色部分,并且图像质量很高。
裁剪功能:
- (UIImage *)cropImage:(UIImage*)image andFrame:(CGRect)rect {
//Note : rec is nothing but the image frame which u want to crop exactly.
rect = CGRectMake(rect.origin.x*image.scale,
rect.origin.y*image.scale,
rect.size.width*image.scale,
rect.size.height*image.scale);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *result = [UIImage imageWithCGImage:imageRef
scale:image.scale
orientation:image.imageOrientation];
CGImageRelease(imageRef);
return result;
}
请帮我。
这可能会运行
- (UIImage *)imageByCroppingImage:(UIImage *)image toSize:(CGSize)size
{
// not equivalent to image.size (which depends on the imageOrientation)!
double refWidth = CGImageGetWidth(image.CGImage);
double refHeight = CGImageGetHeight(image.CGImage);
double x = (refWidth - size.width) / 2.0;
double y = (refHeight - size.height) / 2.0;
CGRect cropRect = CGRectMake(x, y, size.height, size.width);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], cropRect);
UIImage *cropped = [UIImage imageWithCGImage:imageRef scale:0.0 orientation:self.imageOrientation];
CGImageRelease(imageRef);
return cropped;
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系 [email protected] 删除。
我来说两句