rotation

问题 I have an app with a mainwindow which contains a tabbar controller and a number of different views. I want the whole thing to be able to rotate in each direction, however doing - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } didn't help, while that did work in other apps. 回答1: The UITabBarController requires that you enable rotation on all view controllers it manages. So each view controller should return YES for that method for the

问题 I'm trying to rotate an SCNBox I created using swipe gestures . For example, when I swipe right the box should rotate 90degs in the Y-axis and -90degs when I swipe left. To achieve this I have been using the node's SCNAction.rotateByX method to perform the rotation animation. Now the problem I'm having is when rotating along either the X-axis or Z-axis after a rotation in the Y-axis and vice-versa is that the positions of the axes change. What I have notice is that any rotation perform on

问题 I'm trying to rotate an SCNBox I created using swipe gestures . For example, when I swipe right the box should rotate 90degs in the Y-axis and -90degs when I swipe left. To achieve this I have been using the node's SCNAction.rotateByX method to perform the rotation animation. Now the problem I'm having is when rotating along either the X-axis or Z-axis after a rotation in the Y-axis and vice-versa is that the positions of the axes change. What I have notice is that any rotation perform on

问题 div { width: 300px; height: 300px; border:1px solid black; } h1 { width: 300px; transform: rotate(-90deg) } <div> <h1>Hola</h1> </div> If you try this snippet, you will see that the h1 is rotated and placed in the center of the div (makes sense, they have same width) But how to align it to the left? (flexible container's width) 回答1: check this out it will give a direction to your required solution.. div { width: 300px; height: 300px; border: 1px solid black; } h1 { width: 70px; margin-left:

问题 I have two pieces of information: a 2D-vector representing velocity relative to a grid and an angle (180 to negative 180 degrees) representing the player's view-angle also relative to that grid, and I am from that trying to figure out what keys (W, A, S, D) the player is pressing with this information. The thing that is giving me troubles are the fact that the player moves in respect to the view-angle. So if the player is looking 35 degrees relative to our grid and pressing forward (W), the

问题 I found a function function RotateBitmap(var hDIB: HGlobal; radang: Double; clrBack: TColor): Boolean; that rotates an image. But I don't know how to call this function. What parameters I can pass to this function. I don't know how to use this func at all. 回答1: Judging by the code presented hDIB is a pointer to a single memory block containing 2 structures - BitmapInfo and bitmap's pixel array. You can obtain these structures from TBitmap using GetDIBSizes and GetDIB functions. If you are

问题 I found a function function RotateBitmap(var hDIB: HGlobal; radang: Double; clrBack: TColor): Boolean; that rotates an image. But I don't know how to call this function. What parameters I can pass to this function. I don't know how to use this func at all. 回答1: Judging by the code presented hDIB is a pointer to a single memory block containing 2 structures - BitmapInfo and bitmap's pixel array. You can obtain these structures from TBitmap using GetDIBSizes and GetDIB functions. If you are

问题 I'm successfully detecting 0-360 degrees rotation (roll) of phone around an axis, but now I am having hard times designing an effective algorithm to detect one full turn. My working but I think not elegant and as effective algorithm as I would like is: private boolean detectRoll; private boolean[] checkpointsR = new boolean[4]; private boolean fullRollTurn; public void detectingRoll() { setDetectRoll(true); checkpointsR[0] = true; for (int i = 1; i < 4; i++) { if (roll > 90 * i && roll < 90 *

问题 I'm rotating a SCNNode using the following lines: let rotate = SCNAction.rotateByAngle(CGFloat(M_PI), aroundAxis:SCNVector3Make(0, 1, 0), duration: NSTimeInterval(10.0)) let repeat = SCNAction.repeatActionForever(rotate) node.runAction(repeat) and i print the eulerAngles.y of the node in the render method: let rad = Double(node.eulerAngles.y) var angleInDegrees = fmodf(360.0 + -Float(rad) * (180.0 / Float(M_PI)), 360.0) println("eulerAngles.y rad:\(rad) degree:\(angleInDegrees)") but I get

问题 I'm currently developing a flying game in libgdx where you can control the rotation of a bird with the mouse cursor. Right now the bird will instantly rotate to the cursor position. I'm aiming to make the bird rotation lag behind a little bit to make the flying seem more smooth. Rotational damping wont work because i am using the setTransform() method. I would be very happy about any suggestions, this is the code controlling the rotation, it's called every frame in the render method: //get