rotation

问题 waw...!! I actually have my JLabel variable named as jll_img And I already set an icon into it. My purpose is to rotate this jlabel that i put icon into it. I test it out by making a single BUtton, and then when the button is clicked, it will do rotating by a thread. A single anonymous thread that will do loop from 0 degree into 360 degree. Here `// my button actions new Thread() { private boolean doRotating = true; private double norm = 0.0; private double numbs = 0.0; private double

问题 I am working on setting the rotation of an element with JavaScript, I know this is easy to achieve if you want to set to a 90 degree angle but this is not what I want. Because I want to set to strange angles such as 20 degrees I need to use the transform filter. I know the layout of this but I was wondering how I calculate the four values, at first I tried this. calSin = Math.sin(parseInt(css[c])); calCos = Math.cos(parseInt(css[c])); element.style.filter = 'progid:DXImageTransform.Microsoft

问题 I am working on setting the rotation of an element with JavaScript, I know this is easy to achieve if you want to set to a 90 degree angle but this is not what I want. Because I want to set to strange angles such as 20 degrees I need to use the transform filter. I know the layout of this but I was wondering how I calculate the four values, at first I tried this. calSin = Math.sin(parseInt(css[c])); calCos = Math.cos(parseInt(css[c])); element.style.filter = 'progid:DXImageTransform.Microsoft

问题 I am presenting UIActivityViewController from my controller. I've encountered issues with rotations. After some data sharing option is chosen, let's say "Mail", mail compose view controller is presented. But if I rotate the device and dismiss the mail controller afterwards, my VC is not rotated to the current orientation. I've tried to set up the completion handler for UIActivityViewController as following: 1) [activityViewController setCompletionHandler:^(NSString *activityType, BOOL

问题 I have an icon, which is rotated on click. I'd like to "reset" it (without a page refresh), so it would rotate on every click. $('#icon').click(function(){ $(this).css('transform','rotate(360deg)'); }); Here is the example: http://jsfiddle.net/tDvD9/1/ Thanks! 回答1: Here's one simple way: var r = 0; $('#icon').click(function(){ $(this).css('transform','rotate(' + (r += 360) + 'deg)'); }); That way your "transform" property will change on each click (until somebody clicks 100 million times or

问题 I'm writing an Android app that shows moon phases for any date. Currently I am showing a generalized view from the northern hemisphere (sunlit part of the moon moves from right to left with 0º viewing rotation). However, this motion is reversed when viewing the moon from the southern hemisphere, and near the equator, something else happens entirely. Some of this information can be found on this webpage on moon phases. Instead of using just three simplified cases (northern, southern, and

问题 I want a non-horizontal GPUImageTiltShiftFilter rotation. I want to rotate it to an arbitrary rotation angle. I also want the filter to be fast it can be rotated with a UI with a UIRotationGestureRecongizer. How do I do this? 回答1: Ah, figured it out! Instead of modifying GPUImageTiltShiftFilter, make a new GPUImageFilterGroup as a modified version of GPUImageGaussianSelectiveBlurFilter to add rotation. I added: uniform highp float rotation; within kGPUImageSMTiltShiftFragmentShaderString, and

问题 I printed out a 6x6 1d array but want to rotate counter-clockwise the top left 3x3 section. Is there an algorithm for this? In the future I also want to rotate like the bottom right 3x3 section or the top right 3x3 section or the bottom left 3x3 section. a[0] a[1] a[2] a[3] a[4] a[5] a[1] a[2] a[8] a[3] a[4] a[5] a[6] a[7] a[8] a[9] a[10] a[11] a[0] a[7] a[14] a[9] a[10] a[11] a[12] a[13] a[14] a[15] a[16] a[17] ---> a[6] a[12] a[13] a[18] a[19] a[20] a[18] a[19] a[20] a[21] a[22] a[23] a[18]

问题 I printed out a 6x6 1d array but want to rotate counter-clockwise the top left 3x3 section. Is there an algorithm for this? In the future I also want to rotate like the bottom right 3x3 section or the top right 3x3 section or the bottom left 3x3 section. a[0] a[1] a[2] a[3] a[4] a[5] a[1] a[2] a[8] a[3] a[4] a[5] a[6] a[7] a[8] a[9] a[10] a[11] a[0] a[7] a[14] a[9] a[10] a[11] a[12] a[13] a[14] a[15] a[16] a[17] ---> a[6] a[12] a[13] a[18] a[19] a[20] a[18] a[19] a[20] a[21] a[22] a[23] a[18]

问题 I've been reading other posts about how to rotate objects around a point in OpenGL by translating the pivot to the origin, rotating, and the translating back. However, I can't seem to get it working. I have a cube and am using glm::perspective and glm::lookAt to generate the projection and view matrices. glm::mat4 Projection = glm::perspective(45.0f, 4.0f / 3.0f, 0.1f, 100.0f); // Camera matrix glm::mat4 View = glm::lookAt( glm::vec3(0,3.5,-5), glm::vec3(0,0,0), glm::vec3(0,1,0) ); // Model