I have an app that takes the photos via the camera or select it from the library and save it as jpg in the documents folder. But before saving it, I would like to rotate is by 90degrees.
Hope anyone can help me out here.
Thanks
For iOS 4 and later:
UIImage imageWithCGImage:scale:orientation:
For iOS 3 and previous:
How to Rotate a UIImage 90 degrees?
static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
return UIGraphicsGetImageFromCurrentImageContext();
}
You can do it like
static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
return UIGraphicsGetImageFromCurrentImageContext();
}
Taken from here
img.transform = CGAffineTransformMakeRotation(3.14159265/2);
Related
I want to rotate image (left and right rotation) with angle 90.I am using following code it rotate left with angle 360.how can i rotate my image with angle 90.
-(IBAction)btnLeftRotateClicked:(id)sender
{
CATransform3D rotationTransform = CATransform3DMakeRotation(1.0f * M_PI, 0, 0, 1.0);
CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
rotationAnimation.toValue = [NSValue valueWithCATransform3D:rotationTransform];
rotationAnimation.duration = 0.25f;
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = 1;
[imageAdjustView.layer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
}
Thanks.
Why don't you use the affineTransform if you just want to rotate the image in 2D
CGAffineTransformMakeRotation(-M_PI * 0.5);
A rotation of 360 degree is no Rotation. Guess you mean 180 = PI. Thus, 90 degree = .5*PI.
If you want to use some easy drop in classes that rotate a UIImage and also scale it, try looking at: http://bit.ly/w3r5t6 it is a UIImage category called WBImage
#M.S.B:
I think this link will help you.
How to Rotate a UIImage 90 degrees?
How to programmatically rotate image by 90 Degrees in iPhone?
You can refer to this answer by fbrereto in the above link
What about something like:
static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
return UIGraphicsGetImageFromCurrentImageContext();
}
EDIT: You can refer to answer given by Sabobin under the link How to programmatically rotate image by 90 Degrees in iPhone?. I have posted the same code so that you can refer it from here:
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"my_image.png"]];
//set point of rotation
myImageView.center = CGPointMake(100.0, 100.0);
//rotate rect
myImageView.transform = CGAffineTransformMakeRotation(3.14159265/2);
Hope this helps you.
I have a problem
When I get an image from iPhone camera. i can get that in all orientations Like LeftLandscape, RightLandscape, Portrait and portrait upside down.
Now how can I rotate the image fetched from Camera Delegates to only one orientation i.e. Only in Portrait OR Landscape Right
Can anybody HElp ?
Try this...
CGSize size = sizeOfImage;
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextRotateCTM(ctx, angleInRadians);
CGContextDrawImage(UIGraphicsGetCurrentContext(),
CGRectMake(0,0,size.width, size.height),
image);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
Also refer this link...it will help you out...
http://www.platinumball.net/blog/2009/03/30/iphone-uiimage-rotation-and-mirroring/
NYXImagesKit: Handy UIImage Categories
By Benjamin Godard
This is a handy set of categories on UIImage for rotating, resizing, filtering, enhancing and more, in an efficient and easy-to-use manner. Might be useful in some of your apps!
Try this.It will be helpful
-(UIImage *)resizeImage:(UIImage *)image {
CGImageRef imageRef = [image CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGColorSpaceCreateDeviceRGB();
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
int width, height;
width = 640;//[image size].width;
height = 640;//[image size].height;
CGContextRef bitmap;
if (image.imageOrientation == UIImageOrientationUp | image.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, height, width, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
}
if (image.imageOrientation == UIImageOrientationLeft) {
NSLog(#"image orientation left");
CGContextRotateCTM (bitmap, radians(90));
CGContextTranslateCTM (bitmap, 0, -height);
} else if (image.imageOrientation == UIImageOrientationRight) {
NSLog(#"image orientation right");
CGContextRotateCTM (bitmap, radians(-90));
CGContextTranslateCTM (bitmap, -width, 0);
} else if (image.imageOrientation == UIImageOrientationUp) {
NSLog(#"image orientation up");
} else if (image.imageOrientation == UIImageOrientationDown) {
NSLog(#"image orientation down");
CGContextTranslateCTM (bitmap, width,height);
CGContextRotateCTM (bitmap, radians(-180.));
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}
Im developing a photo app.
Here i'm using the images from both photo library and also the images taking through camera and displaying it in a image view.
The images from photo library is coming in correct orientation but camera images are displaying in different orientation.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:#"MyFolder"];
NSString *imagePath = [dataPath stringByAppendingPathComponent:#"girl.jpg"];
if ([[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
UIImage *image = [UIImage imageWithCGImage:[UIImage imageWithContentsOfFile:imagePath].CGImage scale:bieberImage.image.scale
orientation:NO];
// bieberImage.transform = CGAffineTransformMakeRotation(1.57079633);
CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:#"contents"];
crossFade.duration = 3.0;
crossFade.fromValue = (id)bieberImage.image.CGImage;
crossFade.toValue = (id)image.CGImage;
[self.bieberImage.layer addAnimation:crossFade forKey:#"animateContents"];
}
Can anyone tell me how can i correct this problem.
Thanks in advance.
Replace:
UIImage *image = [UIImage imageWithCGImage:[UIImage imageWithContentsOfFile:imagePath].CGImage scale:bieberImage.image.scale
orientation:NO];
With:
UIImage *image = [UIImage imageWithCGImage:[UIImage imageWithContentsOfFile:imagePath].CGImage scale:bieberImage.image.scale
orientation:UIImageOrientationRight];
Edit:
Or try this:
- (UIImage*) rotateImage:(UIImage* )src {
UIImageOrientation orientation = src.imageOrientation;
UIGraphicsBeginImageContext(src.size);
[src drawAtPoint:CGPointMake(0, 0)];
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, [self radians:90]);
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, [self radians:90]);
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, [self radians:0]);
}
return UIGraphicsGetImageFromCurrentImageContext();
}
- (CGFloat) radians:(int)degrees {
return (degrees/180)*(22/7);
}
-(UIImage *)update4:(UIImage *)image {
CGImageRef imageRef = [image CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGColorSpaceCreateDeviceRGB();
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
int width, height;
width = image.size.width;
height = image.size.height;
if(width>320)
{
width = 320;
height = height * 320/width;
}
if(height>480)
{
height = 480;
width = width * 480/height;
}
CGContextRef bitmap;
if (image.imageOrientation == UIImageOrientationUp | image.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, height, width, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
}
if (image.imageOrientation == UIImageOrientationLeft) {
//NSLog(#"image orientation left");
CGContextRotateCTM (bitmap, 3.14/180*90);
CGContextTranslateCTM (bitmap, 0, -height);
} else if (image.imageOrientation == UIImageOrientationRight) {
//NSLog(#"image orientation right");
CGContextRotateCTM (bitmap, -3.14/180*90);
CGContextTranslateCTM (bitmap, -width, 0);
} else if (image.imageOrientation == UIImageOrientationUp) {
//NSLog(#"image orientation up");
} else if (image.imageOrientation == UIImageOrientationDown) {
//NSLog(#"image orientation down");
CGContextTranslateCTM (bitmap, width,height);
CGContextRotateCTM (bitmap, -3.14/180*180);
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {
UIImage *updateImage = [self update4:image];
}
I Want to rotate UIImage in 90 degrees with this method :
static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
return UIGraphicsGetImageFromCurrentImageContext();
}
the problem is that it give me a blank UIImage
Here is the code :-
UIImage *PortraitImage;
PortraitImage = [[UIImage alloc] initWithCGImage: currentImage.CGImage
scale: 1.0
orientation: UIImageOrientationLeft];
if you want to rotate UIImage at some particular angle then you can use CIIFilter to rotate at whatever angle you want but that is possible in IOS 5.0
CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:#"old-country-rain.jpg"]];
CIFilter *RotateFilter = [CIFilter filterWithName:#"CIStraightenFilter"];
[RotateFilter setValue:[NSNumber numberWithFloat: 1.04667f] forKey:#"inputAngle"];
[RotateFilter setValue:inputImage forKey:kCIInputImageKey];
CIImage *displayImage = RotateFilter.outputImage;
UIImage *finalImage = [UIImage imageWithCIImage:displayImage];
I have a question about the png images I am using in my iPhone app. I have a lot of large images for different views, they are compressed but I was wondering if that would slow down the application at all. Like in initial loading time and loading different views Basically I need to know how to make the app smaller in size and faster by just adjusting the images? Or if it is even worth it to mess with that?
I HAVE done research on this topic but I haven't found any viable solutions besides compressing the images.
Any help is much appreciated?
Hope, this helps !!!
http://www.iphonedevsdk.com/forum/iphone-sdk-development/7307-resizing-photo-new-uiimage.html
-(UIImage *)resizeImage:(UIImage *)image {
CGImageRef imageRef = [image CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGColorSpaceCreateDeviceRGB();
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
int width, height;
width = 640;
height = 480;
CGContextRef bitmap;
if (image.imageOrientation == UIImageOrientationUp | image.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, height, width, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
}
if (image.imageOrientation == UIImageOrientationLeft) {
NSLog(#"image orientation left");
CGContextRotateCTM (bitmap, radians(90));
CGContextTranslateCTM (bitmap, 0, -height);
} else if (image.imageOrientation == UIImageOrientationRight) {
NSLog(#"image orientation right");
CGContextRotateCTM (bitmap, radians(-90));
CGContextTranslateCTM (bitmap, -width, 0);
} else if (image.imageOrientation == UIImageOrientationUp) {
NSLog(#"image orientation up");
} else if (image.imageOrientation == UIImageOrientationDown) {
NSLog(#"image orientation down");
CGContextTranslateCTM (bitmap, width,height);
CGContextRotateCTM (bitmap, radians(-180.));
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}
When you use your app, do you notice slow loading times? If not then don't bother messing with the images, the gains will be minimal if at all.
If you are having problems with loading times on your app then don't assume it is the PNGs. Use the tools provided and profile your app to find out what the slow parts are and start from there. Never assume you know what the cause of slow code is.