CODEWITHSUNDEEP
iosrotationuiimage
Sven Vietense
Sven Vietense

Reputation: 43

readout the radius of a rotated UIImage

In my UIView the User can place different UIImages. The User can move and rotate these images.

The Images, type, position are saved in a array for later restore.

I also want to save the ration degree.

Is it possible to read out the degree of the rotated images ? Or must I save the degree at the moment when the images are rotated ?

thanks

Upvotes: 0

Views: 47

Answers (2)

Sven Vietense
Sven Vietense

Reputation: 43

@TheEye: not realy. I think in the link there is the solution. but I'm to stupid to adapt it to my app....

Here is the code where the rotation is done and saved but i works not very fine.

- (IBAction)rotateImage:(UIRotationGestureRecognizer *)sender {
    snap = 0;
    NSMutableDictionary *itemDSNew = [[NSMutableDictionary alloc] init];
    NSDictionary *itemDSOld = (NSDictionary *)[messestandItems objectAtIndex:aktivItemID];

    if (messestandItems.count > 2) {
        CGFloat netRotation = [[itemDSOld objectForKey:@"rotation"] floatValue];
        CGFloat rotation = [(UIRotationGestureRecognizer *)sender rotation];
        CGAffineTransform transform = CGAffineTransformMakeRotation(rotation+netRotation);
        aktivImageView.transform = transform;

        if (sender.state==UIGestureRecognizerStateEnded) {
            netRotation += rotation;
            }
        [itemDSNew addEntriesFromDictionary:itemDSOld];
        [itemDSNew setObject:[NSString stringWithFormat:@"%f", aktivImageView.center.x] forKey:@"posX"];
        [itemDSNew setObject:[NSString stringWithFormat:@"%f", aktivImageView.center.y] forKey:@"posY"];
        [itemDSNew setObject:[NSString stringWithFormat:@"%f", rotation + netRotation] forKey:@"rotation"];
        [itemDSNew setObject:[NSString stringWithFormat:@"0"] forKey:@"snap"];
        [messestandItems replaceObjectAtIndex:aktivItemID withObject:itemDSNew];
        [messestandItems writeToFile:[self saveFilePath] atomically:YES];
        }
}

this is my code to rotate 45°:

float rad = M_PI * (float)45 / 180.0;
aktivImageView.transform = CGAffineTransformRotate(aktivImageView.transform, rad);

but what is the code when i later in the app want to know the transform (rad)

something like:

rad = aktivImageView.transform;
float degree = rad * 180 / M_PI;

and then i have the degree which the User had rotated the Image ?

Upvotes: 0

TheEye
TheEye

Reputation: 9346

Just remember the rotation at the moment when it is rotated - why make it more complicated than that?

Upvotes: 1

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