Il peut être un peu délicat, face à la transform appliquée à l'aperçu de l'image qui le rend un peu différent de celui que vous obtenez remis par la caméra, mais ici est l'idée de base:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];
// Here we are throwing away lots of image resolution -- but since our art is built for the 320 x 480 screen
// and we are worried about uploading bandwidth, crunching the image down from ~1600 x 2400 to 320 x 480 just makes sense
// note that the proportion is a little different, so the picture is slightly stretched in the y-axis, but this is augmented reality, so we like that
// note that hardwareScreenSize has to be determined by checking UIDeviceHardware
UIGraphicsBeginImageContext(hardwareScreenSize);
[img drawInRect:CGRectMake(0, ((hardwareScreenSize.height - hardwareScreenSize.height)/2), hardwareScreenSize.width, hardwareScreenSize.height)];
// this scales overlayImage to fit ontop of camera image
[(UIImage *)overlayImage drawInRect:CGRectMake(0, 0, hardwareScreenSize.width, hardwareScreenSize.height)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
[finalImage retain];
UIGraphicsEndImageContext();
quand j'utilise [(UIImage *) overlayImage drawInRect: CGRectMake (0, 0, hardwareScreenSize.width, hardwareScreenSize.height)]; il donne une image de superposition. Mais lorsque je change la position de l'image en superposition x et y, je prends un instantané et ne donne pas la nouvelle taille x et y. – Ram