rotation

问题 I have two UIViewControllers, "A" and "B", where "A" overrides the shouldAutorotateToInterfaceOrientation to return YES for UIInterfaceOrientationPortrait, and "B" returns YES for all orientations. In my example "A" is the root navigation view controller, and I then use pushViewController for "B". After that I rotate the device into landscape, which successfully autorotates "B", then I pop "B" (back button or via popViewController) to return to "A". When targetting iPhone OS 3.1.3, "A"

问题 I want to rotate a bitmap image based on user click by 10 deg. Following numerous stackoverflow and google answers, I tried various combinations of Matrix rotation. However the image doesn't really rotate as expected and gives a jittery view of rotation + oscillation about canvas center. To test I am increasing rotation angle by 10 deg (instead of clicks) each time object's draw method is called. The image is a symmetrical circle [64x64 enclosing rectangle] and I expect it to rotate at center

问题 Suddenly, for some reason, objects in the unity editor started rotating around their center of gravity (at least that's what I think is going on) instead of their pivot point. I tried placing the object inside an empty object which would serve as the new pivot point, like usual, but this did not change anything. Is this some setting or some updated feature? How can I stop it? 回答1: Check the pivot-setting of the editor 来源： https://stackoverflow.com/questions/22693362/unity-objects-not-rotating

问题 I have a subclass of UIViewController which handles a UIView. The viewcontroller is presented modally (it slides up from the bottom of the screen). At the top of the view, i have added a navigation bar. Note that this bar is not handled by a navigation controller. I want to get the navbar to shrink in height when the view rotates to landscape (similar to how it behaves when it is handled by a UINavigationController). However, I can't set its autoresizing mask to flexible height in IB, and

问题 I am trying to make an image rotate in place with each click (the image is an old-fashioned TV knob). I cannot get it to work despite my best efforts. The code is below: var value = 0 $("#img").rotate({ bind: { click: function(){ value +=90; $(this).rotate({ animateTo:value}) } } }); 回答1: I'm providing a jsFiddle that causes the div to rotate after every mouse click. Essentially, this is from Example 5 of the jqueryrotate.js plugin. Reference: jsFiddle 回答2: There is a jQuery patch, which

问题 I'm implementing some cryptographic algorithm in C which involves an 80 bits key. A particular operation involves a rotate shifting the key x number of bits. I've tried the long double type which if I'm not wrong is 80bits, but that doesn't work with the bitshift operator. The only alternative I can come up with is to use a 10 element char array with some complicated looping and if-else. My question is whether there's some simple and efficient way of carrying this out. Thanks. 回答1: There is

问题 I tried to use the code below to create a continuously rotating square on the screen. But I don't know why the rotational speed is changing. How could I change the code to make the rotational speed invariable? I tried different UIViewKeyframeAnimationOptions , but seems none of them work. override func viewDidLoad() { super.viewDidLoad() let square = UIView() square.frame = CGRect(x: 55, y: 300, width: 40, height: 40) square.backgroundColor = UIColor.redColor() self.view.addSubview(square)

问题 How can I change the starting point of a svg circle for animate it progressively begining at 0 o'clock? the default circle svg begin at 3 o'clock. My current circle ( hover for animation): #timeline{ position:fixed; width:500px; height:500px; top:50%; left:50%; margin-top:-250px; margin-left:-250px; overflow:hidden; pointer-events: all; z-index:99999; } #bluecircle{ stroke-dasharray:1510; stroke-dashoffset:1510; -webkit-transition:all 1s ease; transition:all 1s ease; } #bluecircle:hover{

问题 I am starting out on Molehill and am having a lot of problems grasping Matrix3D. My first problem is how to manage a Matrix3D that describes a single model's orientation. I use Matrix3D.appendRotation() to do this. But depending on the order I append in I get a different result (obviously, since I am rotating one at a time in the global space). I know this is a common problem, I have run into it with 3d software modeling. But this time, I have to fix it programtically. This is where I need

问题 Is quaternion rotation just a vector with X,Y,Z which the object will rotate towards, and a roll which turns the object on its axis? Is it that simple? Meaning if you have X=0, Z=0 and Y=1 the object will face upwards? And if you have Y=0, Z=0 and X=1 the object will face to the right? (assuming X right, Y up and Z depth) 回答1: A quaternion has 4 components, which can be related to an angle θ and an axis vector n . The rotation will make the object rotate about the axis n by an angle θ. For