Graphics Programs Reference
In-Depth Information
{
CGSize origImageSize = [image size];
// The rectangle of the thumbnail
CGRect newRect = CGRectMake(0, 0, 40, 40);
// Figure out a scaling ratio to make sure we maintain the same aspect ratio
float ratio = MAX(newRect.size.width / origImageSize.width,
newRect.size.height / origImageSize.height);
// Create a transparent bitmap context with a scaling factor
// equal to that of the screen
UIGraphicsBeginImageContextWithOptions(newRect.size, NO, 0.0);
// Create a path that is a rounded rectangle
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:newRect
cornerRadius:5.0];
// Make all subsequent drawing clip to this rounded rectangle
[path addClip];
// Center the image in the thumbnail rectangle
CGRect projectRect;
projectRect.size.width = ratio * origImageSize.width;
projectRect.size.height = ratio * origImageSize.height;
projectRect.origin.x = (newRect.size.width - projectRect.size.width) / 2.0;
projectRect.origin.y = (newRect.size.height - projectRect.size.height) / 2.0;
// Draw the image on it
[image drawInRect:projectRect];
// Get the image from the image context, keep it as our thumbnail
UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
[self setThumbnail:smallImage];
// Get the PNG representation of the image and set it as our archivable data
NSData *data = UIImagePNGRepresentation(smallImage);
[self setThumbnailData:data];
// Cleanup image context resources, we're done
UIGraphicsEndImageContext();
}
In
DetailViewController.m
, add the following line of code to
imagePicker-
Controller:didFinishPickingMediaWithInfo:
to create a thumbnail when
the camera takes the original image.
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *oldKey = [item imageKey];
if (oldKey) {
[[BNRImageStore sharedStore] deleteImageForKey:oldKey];
}
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
[item setThumbnailDataFromImage:image];
