rotation

问题 I've decided to use JOGL for my project. But here is the problem with setting perspective. Simple code: System.out.println("BEFORE:"); projectionMatrix.identity(); projectionMatrix.setPerspective(fovy, aspect, zNear, zFar); System.out.println(projectionMatrix); System.out.println("AFTER:"); projectionMatrix.identity(); projectionMatrix.m00 = (float)(1.0 / (aspect*Math.tan(viewAngle))); projectionMatrix.m11 = (float)(1.0 / Math.tan(viewAngle)); projectionMatrix.m22 = (float)((-zNear-zFar) /

问题 I've decided to use JOGL for my project. But here is the problem with setting perspective. Simple code: System.out.println("BEFORE:"); projectionMatrix.identity(); projectionMatrix.setPerspective(fovy, aspect, zNear, zFar); System.out.println(projectionMatrix); System.out.println("AFTER:"); projectionMatrix.identity(); projectionMatrix.m00 = (float)(1.0 / (aspect*Math.tan(viewAngle))); projectionMatrix.m11 = (float)(1.0 / Math.tan(viewAngle)); projectionMatrix.m22 = (float)((-zNear-zFar) /

问题 I've decided to use JOGL for my project. But here is the problem with setting perspective. Simple code: System.out.println("BEFORE:"); projectionMatrix.identity(); projectionMatrix.setPerspective(fovy, aspect, zNear, zFar); System.out.println(projectionMatrix); System.out.println("AFTER:"); projectionMatrix.identity(); projectionMatrix.m00 = (float)(1.0 / (aspect*Math.tan(viewAngle))); projectionMatrix.m11 = (float)(1.0 / Math.tan(viewAngle)); projectionMatrix.m22 = (float)((-zNear-zFar) /

问题 OK so I'm really confused I've rotated sprites before and had no problem such as rotating a boat as it moves through an ocean, but for some reason I'm having a really big problem this time. So I create a texture in an assets file, but not static textures. I load the texture using the following: class Assets{ Texture img; public Assets(){ img = new Texture(Gdx.files.internal("images/PNG.png") And then I call the assets in the main class by calling: Assets assets = new Assets() And then I have

问题 I want to rotate an image file (photo) without changing file size : I create a bitmap with Bitmap.decodeFile I apply the rotation : Matrix matrix = new Matrix(); matrix.postRotate(90); bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); I save bitmap into a file with : bitmap.compress(CompressFormat.JPEG, 100, stream); but the size of my original file has doubled !! 回答1: The image you load is encoded in a certain format (e.g. JPEG) and with a

问题 I’m using ARKit with SceneKit. When user presses a button I create an anchor and to the SCNNode corresponding to it I add a 3D object (loaded from a .scn file in the project). The 3D object is placed facing the camera, with the same orientation the camera has. I would like to make it look like the object is laying on a plane surface and not inclined if it is that way. So, if I got it right, I’d need to apply a rotation transformation so that it’s rotation around the X and Z axis become 0. My

问题 Anyone knows a library that can take a picture with an Android or iOS smartphone and then offer a view to crop or rotate this image (so, without the native preview) I work with PCL / Xamarin.Android / Xamarin.iOS (Not Xamarin.Form) 回答1: You can use FFImageLoading to crop and rotate your images. Try to add pinch/swipe gesture recognizer to your images, when this event fires use the rotate transformation to rotate the image: public RotateTransformation(double degrees, bool ccw, bool resize) { .

问题 Anyone knows a library that can take a picture with an Android or iOS smartphone and then offer a view to crop or rotate this image (so, without the native preview) I work with PCL / Xamarin.Android / Xamarin.iOS (Not Xamarin.Form) 回答1: You can use FFImageLoading to crop and rotate your images. Try to add pinch/swipe gesture recognizer to your images, when this event fires use the rotate transformation to rotate the image: public RotateTransformation(double degrees, bool ccw, bool resize) { .

问题 I was wondering if anyone could help me out, or point me in the right direction. I'm looking for a snippet of jquery that will automatically change the background image of a div every say 5 seconds or so. My initial bg image is set in css, but i'm not sure how to create the function to make it swap between an array of images? I have 5 images: bg-1.jpg, bg-2.jpg, bg-3.jpg, bg-4.jpg, bg-5.jpg. Currently my div is set to bg-1.jpg. <div id="page_bg"></div> Don't really have any code to show, but

问题 I'm trying to have a circle follow an elliptical path that is rotated, using Snap.svg, but I've ran into a problem. Using the getPointAtLength only returns the point of the path that is not rotated, so when I rotate the path, the circle will still follow the original path, before rotation. var firstOrbit = s.path("M250,400a150,75 0 1,0 300,0a150,75 0 1,0 -300,0") .attr({stroke: "#000", strokeWidth:"5", fill: "transparent"}); var len = firstOrbit.getTotalLength(); firstOrbit = firstOrbit