I am working on image editing application(resize, rotation, 3d transform). If I am rotate the image and then make 3D transform. Its going to initial image. Otherwise I am change the 3D transform then make rotation, Its also goes to the initial state.
For image 3D Transform I am using below code :
- (void)moveImage:(UIPanGestureRecognizer *)recognizer
{
if ([recognizer respondsToSelector:#selector(translationInView:)]) {
CGPoint translation = [(UIPanGestureRecognizer *)recognizer translationInView:recognizer.view.superview];
CALayer *layer = self.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / 500.0;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, - self.xTranslation / 50.0 * M_PI / 180.0f, 0.0f, 1.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
rotationAndPerspectiveTransform.m34 = - 1.0 / 500.0;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, - self.yTranslation / 50.0 * M_PI / 180.0f, 1.0f, 0.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
}
}
For image Rotation I am using below code :
- (void)rotateImage:(UIRotationGestureRecognizer *)recognizer
{
if (state == RSImageViewStateResizing) {
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
recognizer.rotation = 0;
}
}
How to I fix this issue. Always welcome your suggestions, sample code, Sample project, any App store applications. Thanks in advance. Any one help me.
Use CAAnimationGroup to combine multiple animation into one
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
theGroup.animations=[NSArray arrayWithObject:resizeAnimation, rotationAnimation, 3d transformAnimation];// add here your CAAnimation reference and CATransform3D reference
[layer addAnimation:theGroup forKey:#"animatePosition"];
Related
I know how to rotate a view from right to left
CATransform3D transform = CATransform3DIdentity;
transform = CATransform3DMakeRotation(M_PI, 0.0f, 1.0f, 0.0f);
transform.m34 = 0.0015;
view.layer.transform = transform;
But i cant rotate it from left to right.
Please help me.
I'm not sure what you mean by “left to right” and “right to left”. Anyway, as you have discovered, you can't control the direction of the animation just by setting the transform matrix, because both -M_PI and +M_PI have the same final effect, so there's no way for Core Animation to reliably know which way you want it to rotate.
Instead, you can animate the transform.rotation.y key path of the layer. This is a little more complicated to do, particularly since you want to animate a view's layer instead of a freestanding layer (not controlled by a view).
Anyway, here's the code I tested:
- (IBAction)rotateButtonWasTapped:(id)sender {
// Establish the perspective to be used during the animation.
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 0.0015;
self.imageView.layer.transform = transform;
static CGFloat kAngle = -M_PI;
[CATransaction begin]; {
// After the animation completes, make the transform “permanent”. Otherwise it
// will be undone when the animation is removed from the layer.
[CATransaction setCompletionBlock:^{
self.imageView.layer.transform = CATransform3DRotate(transform, kAngle, 0, 1, 0);
}];
// Animate the rotation using Core Animation's extension to Key Value Coding.
// The sign of kAngle determines the direction of rotation.
CABasicAnimation *animation = [CABasicAnimation
animationWithKeyPath:#"transform.rotation.y"];
animation.fromValue = #0;
animation.toValue = #(kAngle);
animation.duration = 1;
[self.imageView.layer addAnimation:animation forKey:animation.keyPath];
} [CATransaction commit];
}
This rotates the view such that the left edge of the view moves “closer” to the user during the rotation. If that's not what you mean by “left to right”, change the definition of kAngle to M_PI and it will rotate in the other direction. I have tested both ways. You can even spin the layer multiple times in one animation. For example, try defining kAngle as -3 * M_PI.
I did not find anything in the function documentation, but I think you can just make the rotation angle negative to rotate into the other direction.
if you want to rotate the view, back to the initial position... just do it with:
transform = CATransform3DMakeRotation(0, 0.0f, 1.0f, 0.0f)
or you can "combine" more..
CATransform3D transform = CATransform3DIdentity;
transform = CATransform3DMakeRotation(-M_PI_2, 0.0f, 1.0f, 0.0f);
transform = CATransform3DMakeRotation(0, 0.0f, 1.0f, 0.0f);
transform.m34 = 0.0015;
view.layer.transform = transform;
You can try... to use CATransform3D transform = starLayer.transform; instead of CATransform3D transform = CATransform3DIdentity;
-(void)updateTimer
{
if(update<125)
update=update+1;
NSTimeInterval now = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval interval = now - start;
int inter = (int)(interval*update);
inter*=10;
milliSec = (inter) % 1000;
seconds = (inter/1000) % 60;
minutes = (inter/60000) % 60;
timeValue = oldTimeValue+inter;
// Set Digital clock
// Set Analog clock hands
secHand.layer.transform = CATransform3DMakeRotation (Degrees2Radians(-(timeValue%1000)*360/1000), 0, 0, 1);
}
CATransform3D not working properly, I am using the below code. My problem is If I change the transform Its working fine. Once I release my finger and then make more transform the image goes to the Initial image. How to set the last transform? I am using PanGesture for the transform. Please give some Idea. Thanks in advance.
if ([recognizer respondsToSelector:#selector(translationInView:)]) {
CGPoint translation = [(UIPanGestureRecognizer *)recognizer translationInView:recognizer.view.superview];
CALayer *layer = self.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / -500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, translation.x * M_PI / 180.0f, 0.0f, 1.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
rotationAndPerspectiveTransform.m34 = 1.0 / -500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, -translation.y * M_PI / 180.0f, 1.0f, 0.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
}
CATransform3DIdentity means you resetting the transformation every time your view receives touch. Use CATransform3D rotationAndPerspectiveTransform = layer.transform; instead.
If you want to rotate an object using core animation, in radians, in the z axis, which of the following key paths of layer's CATransform3D matrix will you use? (more than 1 options can be right).
rotation
rotation.xy
rotation.x
rotation.y
rotation.z
Not totally clear about the options you gave, but I use the code below to do rotation:
[[_yourView layer] setAnchorPoint:CGPointMake(0.0f, 0.5)];
[UIView animateWithDuration:1.0f
delay:0.0f
options:UIViewAnimationCurveEaseInOut
animations:^{
CATransform3D rotation = CATransform3DIdentity;
rotation.m34 = 1.0f / -300.0f;
rotation = CATransform3DRotate(rotation, -60.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f);
[[_yourView layer] setTransform:rotation];
}
completion:nil];
It is rotated in y axis(so, the view will change in z direction), you can set the rotation for other axis by setting the params below:
rotation = CATransform3DRotate(rotation, -60.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f);
None of the above. Use transform.rotation.z
I want to add a back image to a CALayer when the my rotation transform degree is higher than 90.
It is just like a Flipboard flip animation.
This is my current code:
CALayer *layer = self.view.layer;
int frames = 130;
layer.anchorPoint = CGPointMake(0, 0.5);
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0 / -2000.0;
transform = CATransform3DRotate(transform, -frames * M_PI / 180.0, 0.0, 1.0, 0.0);
self.view.layer.transform = transform;
CAKeyframeAnimation *pivot = [CAKeyframeAnimation animationWithKeyPath:#"transform"];
NSMutableArray *values = [[NSMutableArray alloc] initWithCapacity:45];
NSMutableArray *times = [[NSMutableArray alloc] initWithCapacity:45];
for (int i = 0; i < frames; i++) {
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0 / -2000.0;
transform = CATransform3DRotate(transform, -M_PI / 180.0 * i, 0.0, 1.0, 0.0);
[values addObject:[NSValue valueWithCATransform3D:transform]];
[times addObject:[NSNumber numberWithFloat:(float)i / (frames - 1)]];
}
pivot.values = values;
pivot.keyTimes = times;
[values release];
[times release];
pivot.duration = 0.5f;
pivot.calculationMode = kCAAnimationLinear;
[layer addAnimation: pivot forKey: #"pivot"];
Could anyone tell me how to add a back image just like the flip effect.
As far as I know, the easiest way to do it is to add two sublayers representing the front side and the back side of the page. Set both the sublayers' doubleSided property to NO. Set the back side layer transform to the same flipped transform you're animating to. Then, when the page's front side faces the viewer, the front side layer is visible and the back side layer is "hidden", and vice versa.
See GeekGameBoard source code (Card.m) for a sample of the technique.
I'm using the following code to rotate an image, but half the image (down the y-axis) that has been rotated "out of" the page, disappears. How to fix? heading is in radians.
CALayer *layer = myUIImageView.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / 500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, heading, 0.0f, 1.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
The solution to this was to set the zPosition property of all my layers appropriately. Thanks is due to #Brad Larson, who suggested this solution in a comment here. It seems that, when you start using CATransform3D, the normal zindex view hierarchy established by addsubview is thrown out the window.
layer.anchorPoint = CGPointMake(0.0, 0.0);
Setting the anchorPoint to {0.0, 0.0} works as well (as Liam already pointed out).
Here's the full code snippet for changing the anchorPoint without changing the layer's position on screen:
layer.anchorPoint = CGPointMake( 0.0, 0.0 );
CGPoint position = layer.position;
CGSize size = layer.bounds.size;
CGFloat posX = position.x - size.width / 2.0;
CGFloat posY = position.y - size.height / 2.0;
layer.position = CGPointMake( posX, posY );