2014/10/15 下午 10:04:55

iphone Programming Glossary: catransform3d

http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew

p4 should be stretched in a 2D perspective and the image should be distorted. I tried to use CATransform3D but it seems that this cannot be done in such way since it's only a change the perspective of view rotate.. the x y factor in the transformation. This indicates such a transform is not linear. Therefore CATransform3D cannot perform this as a 2D transform either. However the vector x y z w 1 will be converted to the.. have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition is struct CATransform3D CGFloat m11 m12 m13 m14 CGFloat m21 m22 m23..

How do I apply a perspective transform to a UIView?

http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview

share improve this question As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly.. to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix math has never been my thing so I can't explain exactly why this works but it does. You'll.. be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity rotationAndPerspectiveTransform.m34 1.0 500 rotationAndPerspectiveTransform..

Transforming a rectangle image into a quadrilateral using a CATransform3D

http://stackoverflow.com/questions/9470493/transforming-a-rectangle-image-into-a-quadrilateral-using-a-catransform3d

a rectangle image into a quadrilateral using a CATransform3D I have an image and a set of four points describing a quadrilateral Q . I want to transform this image.. of a scale a rotation and a perspective matrix. I am wondering if this is possible using a CATransform3D 4x4 matrix. Do you have any hints on how to do that I've tried to take the four points and build 16.. iOS https github.com hfossli AGGeometryKit Make sure your anchor point is top left CGPointZero . CATransform3D rectToQuad CGRect rect quadTL CGPoint topLeft quadTR CGPoint topRight quadBL CGPoint bottomLeft ..

iPhone image stretching (skew)

http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew

p1 p2 p3 p4. Then I need to set p4.x 50 p4.y 30. So this corner p4 should be stretched in a 2D perspective and the image should be distorted. I tried to use CATransform3D but it seems that this cannot be done in such way since it's only a change the perspective of view rotate bring closer farther one side . Maybe CGAffineTransform.. point of the lines joining p1 and p3 and p2 and p4. Now notice the x y factor in the transformation. This indicates such a transform is not linear. Therefore CATransform3D cannot perform this as a 2D transform either. However the vector x y z w 1 will be converted to the actual 3D vector x w y w z w before projection if CA follows.. locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition is struct CATransform3D CGFloat m11 m12 m13 m14 CGFloat m21 m22 m23 m24 CGFloat m31 m32 m33 m34 CGFloat m41 m42 m43 m44 typedef..

How do I apply a perspective transform to a UIView?

http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview

be really appreciated iphone ios cocoa touch core animation share improve this question As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 ... a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix math has never been my thing so I can't explain exactly why this works but it does. You'll need to set this value to a negative fraction for your initial.. your layer rotation transforms to that. You should also be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity rotationAndPerspectiveTransform.m34 1.0 500 rotationAndPerspectiveTransform CATransform3DRotate rotationAndPerspectiveTransform..

Transforming a rectangle image into a quadrilateral using a CATransform3D

http://stackoverflow.com/questions/9470493/transforming-a-rectangle-image-into-a-quadrilateral-using-a-catransform3d

a rectangle image into a quadrilateral using a CATransform3D I have an image and a set of four points describing a quadrilateral Q . I want to transform this image so that it is fits the quadrilateral Q. Photoshop calls.. of the image moving in space it is in fact the combination of a scale a rotation and a perspective matrix. I am wondering if this is possible using a CATransform3D 4x4 matrix. Do you have any hints on how to do that I've tried to take the four points and build 16 equations out of A' A x u but it did not work I'm not sure of.. improve this question I've created a kit for doing this on iOS https github.com hfossli AGGeometryKit Make sure your anchor point is top left CGPointZero . CATransform3D rectToQuad CGRect rect quadTL CGPoint topLeft quadTR CGPoint topRight quadBL CGPoint bottomLeft quadBR CGPoint bottomRight return self rectToQuad rect quadTLX..

How to merge the perspective image(3D Transform)?

http://stackoverflow.com/questions/12457047/how-to-merge-the-perspective-image3d-transform

s on top of each other the one containing the perspective image being transformed using a cleverly designed CATransform3D If you absolutely need to blend the images you will need to use another framework such as OpenCV warpPerspective is the..

How do I create/render a UIImage from a 3D transformed UIImageView?

http://stackoverflow.com/questions/1949003/how-do-i-create-render-a-uiimage-from-a-3d-transformed-uiimageview

A very simple iPhone project is available here . Thanks. void transformImage float degrees 12.0 float zDistance 250 CATransform3D transform3D CATransform3DIdentity transform3D.m34 1.0 zDistance the m34 cell of the matrix controls perspective and zDistance.. is available here . Thanks. void transformImage float degrees 12.0 float zDistance 250 CATransform3D transform3D CATransform3DIdentity transform3D.m34 1.0 zDistance the m34 cell of the matrix controls perspective and zDistance affects the sharpness.. the m34 cell of the matrix controls perspective and zDistance affects the sharpness of the transform transform3D CATransform3DRotate transform3D DEGREES_TO_RADIANS degrees 1 0 0 perspective transform on y axis imageView.layer.transform transform3D..

iPhone image stretching (skew)

http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew

p4.y 30. So this corner p4 should be stretched in a 2D perspective and the image should be distorted. I tried to use CATransform3D but it seems that this cannot be done in such way since it's only a change the perspective of view rotate bring closer farther.. p2 and p4. Now notice the x y factor in the transformation. This indicates such a transform is not linear. Therefore CATransform3D cannot perform this as a 2D transform either. However the vector x y z w 1 will be converted to the actual 3D vector x w.. 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition is struct CATransform3D CGFloat m11 m12 m13 m14 CGFloat m21 m22 m23 m24 CGFloat m31 m32..

How do I apply a perspective transform to a UIView?

http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview

touch core animation share improve this question As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the.. rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix math has never been my thing so I can't explain exactly why this works but it does. You'll need to set this.. You should also be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity rotationAndPerspectiveTransform.m34 1.0 500 rotationAndPerspectiveTransform..

how can I use animation in cocos2d?

http://stackoverflow.com/questions/486609/how-can-i-use-animation-in-cocos2d

UIImageView by initializing it with your roulette wheel image. When you want the wheel to spin use the following code CATransform3D rotationTransform CATransform3DMakeRotation 1.0f M_PI 0 0 1.0 CABasicAnimation rotationAnimation rotationAnimation CABasicAnimation.. with your roulette wheel image. When you want the wheel to spin use the following code CATransform3D rotationTransform CATransform3DMakeRotation 1.0f M_PI 0 0 1.0 CABasicAnimation rotationAnimation rotationAnimation CABasicAnimation animationWithKeyPath.. rotationAnimation CABasicAnimation animationWithKeyPath @ transform rotationAnimation.toValue NSValue valueWithCATransform3D rotationTransform rotationAnimation.duration 0.25f rotationAnimation.cumulative YES rotationAnimation.repeatCount 10 rotatingImage.layer..

Is there a way to figure out, how many degrees an view is rotated currently during an animation?

http://stackoverflow.com/questions/877198/is-there-a-way-to-figure-out-how-many-degrees-an-view-is-rotated-currently-duri

currently during an animation I am applying an rotation transform animation in an animation block with this transform CATransform3D rotatedTransform self.layer.transform rotatedTransform CATransform3DRotate rotatedTransform 90 M_PI 180.0 0.0f 0.0f 1.0f.. in an animation block with this transform CATransform3D rotatedTransform self.layer.transform rotatedTransform CATransform3DRotate rotatedTransform 90 M_PI 180.0 0.0f 0.0f 1.0f self.layer.transform rotatedTransform The animation begins and the user..

Transforming a rectangle image into a quadrilateral using a CATransform3D

http://stackoverflow.com/questions/9470493/transforming-a-rectangle-image-into-a-quadrilateral-using-a-catransform3d

a rectangle image into a quadrilateral using a CATransform3D I have an image and a set of four points describing a quadrilateral Q . I want to transform this image so that it is fits.. is in fact the combination of a scale a rotation and a perspective matrix. I am wondering if this is possible using a CATransform3D 4x4 matrix. Do you have any hints on how to do that I've tried to take the four points and build 16 equations out of A'.. kit for doing this on iOS https github.com hfossli AGGeometryKit Make sure your anchor point is top left CGPointZero . CATransform3D rectToQuad CGRect rect quadTL CGPoint topLeft quadTR CGPoint topRight quadBL CGPoint bottomLeft quadBR CGPoint bottomRight..