To use tensordot, compute the outer product of the g tensors: def rotT(T, g): gg = np.outer(g, g) gggg = np.outer(gg, gg).reshape(4 * g.shape) axes = ((0, 2, 4, 6), (0, 1, 2, 3)) return np.tensordot(gggg, T, axes) On my system, this is around seven times faster than Sven’s solution. If the g tensor doesn’t … Read more
//Use onSaveInstanceState(Bundle) and onRestoreInstanceState @Override public void onSaveInstanceState(Bundle savedInstanceState) { // Save UI state changes to the savedInstanceState. // This bundle will be passed to onCreate if the process is // killed and restarted. savedInstanceState.putBoolean(“MyBoolean”, true); savedInstanceState.putDouble(“myDouble”, 1.9); savedInstanceState.putInt(“MyInt”, 1); savedInstanceState.putString(“MyString”, “Welcome back to Android”); // etc. super.onSaveInstanceState(savedInstanceState); } //onRestoreInstanceState @Override public void onRestoreInstanceState(Bundle savedInstanceState) … Read more
Setting duration and/or repeat count did not help me with an indeterminate ProgressBar animation. I had to increase the toDegrees to have it make additional loops: <rotate xmlns:android=”http://schemas.android.com/apk/res/android” android:drawable=”@drawable/ic_indeterminate_progress” android:duration=”1″ android:fromDegrees=”0″ android:pivotX=”50%” android:pivotY=”50%” android:toDegrees=”1080″ /> <!–1080 is 3 loops instead of 1 in same amt of time–>
If you are trying to reset the transformation, so that the image appears as it did originally, you can simply set the transform back to the identity. self.imageView.transform = CGAffineTransformIdentity If you want to apply arbitrary transformations to the transformed image, the easiest thing to do would be to use the CGAffineTransform methods that take … Read more
To rotate a DIV we can add some CSS that, well, rotates the DIV using CSS transform rotate. To toggle the rotation we can keep a flag, a simple variable with a boolean value that tells us what way to rotate. var rotated = false; document.getElementById(‘button’).onclick = function() { var div = document.getElementById(‘div’), deg = … Read more
Short answer: When you use pygame.transform.rotate the size of the new rotated image is increased compared to the size of the original image. You must make sure that the rotated image is placed so that its center remains in the center of the non-rotated image. To do this, get the rectangle of the original image … Read more
There is an elegant solution for this problem, specially suited for quaternions. It is known as the “swing twist decomposition”: in pseudocode /** Decompose the rotation on to 2 parts. 1. Twist – rotation around the “direction” vector 2. Swing – rotation around axis that is perpendicular to “direction” vector The rotation can be composed … Read more
See if you are getting the following error when your App starts. Application windows are expected to have a root view controller at the end of application launch If so the way to fix it is by making the following change in the AppDelegate.m file (although there seem to be a number of answers how … Read more
When I was trying to figure out how rotations would work for my tetris game, this was the first question that I found on stack overflow. Even though this question is old, I think my input will help others trying to figure this out algorithmically. First, I disagree that hard coding each piece and rotation … Read more
self.imageview.transform = CGAffineTransformMakeRotation(M_PI_2); Swift 4+: self.imageview.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi/2))