将 UIScrollViewPoint 转换为 UIImage + ZOOM + ROTATE
Convert UIScrollViewPoint to UIImage + ZOOM + ROTATE
我需要裁剪加载在 UIScrollview
中的 UIImage
和另一个 UIView
的一些矩形,后者也在 UIScrollView
中
以下是视图层次结构
--> View
--> UIScrollView
--> viewBase (UIView)
--> UIImageView -> (Zoomed & rotated )
--> UIView (Target View)(Movable User can move anywhere in scrollview to crop rect)
我的图像旋转并缩放了我需要在 TargetView
中获取图像的确切部分
我在 context
上旋转绘制 UIImage
以下是代码
CGFloat angleCroppedImageRetreacted = atan2f(self.imgVPhoto.transform.b, self.imgVPhoto.transform.a);
angleCroppedImageRetreacted = angleCroppedImageRetreacted * (180 / M_PI);
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.imgVPhoto.image.size.width, self.imgVPhoto.image.size.height)];
rotatedViewBox.transform = CGAffineTransformMakeRotation(-angleCroppedImageRetreacted);
CGSize rotatedSize = rotatedViewBox.frame.size;
UIGraphicsBeginImageContext(rotatedSize);
CGContextRef bitmap = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(bitmap, rotatedSize.width / 2.0f, rotatedSize.height / 2.0f);
CGContextRotateCTM(bitmap, -angleCroppedImageRetreacted);
CGContextScaleCTM(bitmap, 1.0f, -1.0f);
CGContextDrawImage(bitmap, CGRectMake(-self.imgVPhoto.image.size.width / 2.0f,
-self.imgVPhoto.image.size.height / 2.0f,
self.imgVPhoto.image.size.width,
self.imgVPhoto.image.size.height),
self.imgVPhoto.image.CGImage);
UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
而且效果很好。我得到的旋转 UIImage 与我在模拟器中看到的一样
为了将目标视角转换为UIImage
,我使用了以下代码,但它不起作用
CGPoint imageViewPoint = [self.viewBase convertPoint:self.targetImageview.center toView:self.imgVPhoto];
float percentX = imageViewPoint.x / self.imgVPhoto.frame.size.width;
float percentY = imageViewPoint.y / self.imgVPhoto.frame.size.height;
CGPoint imagePoint = CGPointMake(resultImage.size.width * percentX, resultImage.size.height * percentY);
rect.origin = imagePoint;
//rect.origin.x *= (self.imgVPhoto.image.size.width / self.imgVPhoto.frame.size.width);
//rect.origin.y *= (self.imgVPhoto.image.size.height / self.imgVPhoto.frame.size.height);
imageRef = CGImageCreateWithImageInRect([resultImage CGImage], rect);
img = [UIImage imageWithCGImage:imageRef scale:viewImage.scale orientation:viewImage.imageOrientation];
我认为问题是我们无法在转换应用
后使用 Rect
请帮我裁剪 UIImage
,它是在同一层次结构
上从矩形缩放和旋转的
如果您需要更多信息,请询问
我正在回答我自己的问题。
感谢 Matic 提供想法
我改了个逻辑
我已经实现了我正在寻找的相同功能
CGPoint locationInImageView = [self.viewBase convertPoint:self.targetImageview.center toView:self.view]; // received from touch
locationInImageView = [self.view convertPoint:locationInImageView toView:self.imgVPhoto];
// I GOT LOCATION IN UIIMAGEVIEW OF TOUCH POINT
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0);
[self.imgVPhoto.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img1 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// I GOT UIIMAGE FROM CURRENT CONTEXT
CGFloat width = self.targetImageview.frame.size.width * self.zoomScale ;
CGFloat height = self.targetImageview.frame.size.height * self.zoomScale ;
//2 IS SCALE FACTOR
CGFloat xPos = (locationInImageView.x * 2) - width / 2;
CGFloat yPos = (locationInImageView.y * 2) - height / 2;
CGRect rect1 = CGRectMake(xPos, yPos, width, height);
CGImageRef imageRef = CGImageCreateWithImageInRect([img1 CGImage], rect1);
// YAHHH YOU HAVE EXACT IMAGE
UIImage *img = [UIImage imageWithCGImage:imageRef scale:img1.scale orientation:img1.imageOrientation];
我需要裁剪加载在 UIScrollview
中的 UIImage
和另一个 UIView
的一些矩形,后者也在 UIScrollView
以下是视图层次结构
--> View
--> UIScrollView
--> viewBase (UIView)
--> UIImageView -> (Zoomed & rotated )
--> UIView (Target View)(Movable User can move anywhere in scrollview to crop rect)
我的图像旋转并缩放了我需要在 TargetView
我在 context
上旋转绘制 UIImage
以下是代码
CGFloat angleCroppedImageRetreacted = atan2f(self.imgVPhoto.transform.b, self.imgVPhoto.transform.a);
angleCroppedImageRetreacted = angleCroppedImageRetreacted * (180 / M_PI);
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.imgVPhoto.image.size.width, self.imgVPhoto.image.size.height)];
rotatedViewBox.transform = CGAffineTransformMakeRotation(-angleCroppedImageRetreacted);
CGSize rotatedSize = rotatedViewBox.frame.size;
UIGraphicsBeginImageContext(rotatedSize);
CGContextRef bitmap = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(bitmap, rotatedSize.width / 2.0f, rotatedSize.height / 2.0f);
CGContextRotateCTM(bitmap, -angleCroppedImageRetreacted);
CGContextScaleCTM(bitmap, 1.0f, -1.0f);
CGContextDrawImage(bitmap, CGRectMake(-self.imgVPhoto.image.size.width / 2.0f,
-self.imgVPhoto.image.size.height / 2.0f,
self.imgVPhoto.image.size.width,
self.imgVPhoto.image.size.height),
self.imgVPhoto.image.CGImage);
UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
而且效果很好。我得到的旋转 UIImage 与我在模拟器中看到的一样
为了将目标视角转换为UIImage
,我使用了以下代码,但它不起作用
CGPoint imageViewPoint = [self.viewBase convertPoint:self.targetImageview.center toView:self.imgVPhoto];
float percentX = imageViewPoint.x / self.imgVPhoto.frame.size.width;
float percentY = imageViewPoint.y / self.imgVPhoto.frame.size.height;
CGPoint imagePoint = CGPointMake(resultImage.size.width * percentX, resultImage.size.height * percentY);
rect.origin = imagePoint;
//rect.origin.x *= (self.imgVPhoto.image.size.width / self.imgVPhoto.frame.size.width);
//rect.origin.y *= (self.imgVPhoto.image.size.height / self.imgVPhoto.frame.size.height);
imageRef = CGImageCreateWithImageInRect([resultImage CGImage], rect);
img = [UIImage imageWithCGImage:imageRef scale:viewImage.scale orientation:viewImage.imageOrientation];
我认为问题是我们无法在转换应用
后使用Rect
请帮我裁剪 UIImage
,它是在同一层次结构
如果您需要更多信息,请询问
我正在回答我自己的问题。
感谢 Matic 提供想法
我改了个逻辑
我已经实现了我正在寻找的相同功能
CGPoint locationInImageView = [self.viewBase convertPoint:self.targetImageview.center toView:self.view]; // received from touch
locationInImageView = [self.view convertPoint:locationInImageView toView:self.imgVPhoto];
// I GOT LOCATION IN UIIMAGEVIEW OF TOUCH POINT
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0);
[self.imgVPhoto.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img1 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// I GOT UIIMAGE FROM CURRENT CONTEXT
CGFloat width = self.targetImageview.frame.size.width * self.zoomScale ;
CGFloat height = self.targetImageview.frame.size.height * self.zoomScale ;
//2 IS SCALE FACTOR
CGFloat xPos = (locationInImageView.x * 2) - width / 2;
CGFloat yPos = (locationInImageView.y * 2) - height / 2;
CGRect rect1 = CGRectMake(xPos, yPos, width, height);
CGImageRef imageRef = CGImageCreateWithImageInRect([img1 CGImage], rect1);
// YAHHH YOU HAVE EXACT IMAGE
UIImage *img = [UIImage imageWithCGImage:imageRef scale:img1.scale orientation:img1.imageOrientation];