rotation

问题 I am making this program where you can click on an object, zoom to it, then look at it from all angles by holding the right mouse button and dragging. I need the camera to be going around the object, not rotate the object with the camera looking at it. I honestly just have no idea how to math it out! For testing there is already a game object with an xyz we have selected and are looking at var g = new GameObject(500, 0, 0);//The game object with xyz this.selected = g;//set selected to g /

问题 My bash script produces a log file. Now i'd like to implement some log file rotation. Let's say the first time it's called somelog.log , the next time it's renamed to somelog.log.1 and the new log file somelog.log . The third time the new log is somelog.log again, but somelog.log.1 is renamed to somelog.log.2 and the old somelog.log to somelog.log.1 . I would be able to grant a maximum of eg 5. Is this done before (sample script), any suggestions. I appreciate any advice. 回答1: Try this bash

问题 I am developing an android app where I have to rotate a circular image around another circular image, but when I am running this the size of my circular image gets automatically changing continuously. So please help me how to solve this. Here is my code public class JobSearch extends Activity implements OnTouchListener { private ImageView dialer; private float y=0; public boolean onTouch(View v, MotionEvent event) { double r=Math.atan2(event.getX()-dialer.getWidth()/2, dialer.getHeight()/2

问题 I am developing an android app where I have to rotate a circular image around another circular image, but when I am running this the size of my circular image gets automatically changing continuously. So please help me how to solve this. Here is my code public class JobSearch extends Activity implements OnTouchListener { private ImageView dialer; private float y=0; public boolean onTouch(View v, MotionEvent event) { double r=Math.atan2(event.getX()-dialer.getWidth()/2, dialer.getHeight()/2

问题 I am attempting to save and load a UIImage to and from the iPhone documents directory after the image is picked from the iPhone Photo Library. It is able to do so, but for some reason, when I load the image, it rotates it 90 degrees counterclockwise. Here is my saveImage and loadImage methods: Save Image: - (void)saveImage: (UIImage*)image{ if (image != nil) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory =

问题 I'm drawing a flat disk using gluDisk() in my scene. gluDisk() draws the disk facing the positive Z axis but I want it to be facing some arbitrary normal I have. Clearly I need to use glRotate() to get the disk facing properly but what should be the rotation? I remember this can be calculated using Quaternions but I can't seem to remember the math. 回答1: The solution should be pretty straightforward, and shouldn't require quarternions. The axis of rotation to get from Normal1 to Normal2 must

问题 I would like to rotate an image by 90 degrees with CSS only. I can do the rotation, but then the position of the image is not what it should be. First, it will overlay some other elements in the same div, and second, its vertical dimension will become bigger than the containing div. Here is my code where the two classes are defined. .imagetest img { transform: rotate(270deg); -ms-transform: rotate(270deg); -moz-transform: rotate(270deg); -webkit-transform: rotate(270deg); -o-transform: rotate

问题 I am working on an Android app, for which I would like the user to be able to press a button which either enables or disables auto-rotate. How can I do this with an Intent? I'd imagine I would somehow need to change ACCELEROMETER_ROTATION to 0 or 1, but I don't know how to do this precisely. I hope maybe one of you guys can help me out! 回答1: You can toggle Rotation ON/OFF using ACCELEROMETER_ROTATION as : if (android.provider.Settings.System.getInt(getContentResolver(),Settings.System

问题 I have UIViewController without a xib, and I'm using loadView to build my UI that creates and adds two scroll views. The thing is, the main view frame size is not changing when rotation happens. I mean, I'm setting initial frame size for the main view in loadView (portrait mode: frame size width = 320, height = 480). After rotation to landscape orientation, the view main frame size isn't changing and is the same as in portrait mode. Here's my loadView: -(void)loadView{ CGRect screenBounds = [

问题 I am brand new to Raphael and am really stuck, I would like to rotate a div and its contents, using a button, with Raphael. Ideally, I would like to have a smooth animation that goes from 0 degrees to -90 degrees when the button is clicked, then when the button is clicked again, the animation would reverse. I think I will change the id or class on mouse click so that I can use the same button for both animations. Would that be wise? I really would like some help please, my Sandbox is at http: