rotation

问题 I'm trying to rotate a matrix counterclockwise by 90 degrees in Java. I found answers on how to do this with a 2D matrix, but my matrix is 3D. Here's how I found out on how to do a 2D rotation: static int[][] rotateCW(int[][] mat) { final int M = mat.length; final int N = mat[0].length; int[][] ret = new int[N][M]; for (int r = 0; r < M; r++) { for (int c = 0; c < N; c++) { ret[c][M-1-r] = mat[r][c]; } } return ret; } How would I go about rotating a 3D matrix then? 回答1: By multiplying your

问题 I am quit new to using PDFBox. What I need is to add an image with rotation to an exiting PDF! I know how to add the image, but my problem is how to rotate the image! I've seen somethign about AffineTransform and Matrix but I have no idea what is that and how it works! I'd really appreciate passing some sample code, and thank you in advance! Best Regards 回答1: It helps to look at the source of the "simple" image display method: public void drawXObject(PDXObject xobject, float x, float y, float

问题 I have following code, where closely mapped sprite, rectangle and polygon is been rotated at same angle in libgdx. After rotation rectangle is misaligned with the sprite. Although sprite is rotated when its drawn, the coordinates and dimensions stay same after the rotation. This is not the case for rectangle. Please see the code and results image below. public void rotate(int angle){ System.out.println("Before-recta x , y " + this.rectangle.getX() + " " + this.rectangle.getY() + " " + this

问题 I'm creating a Panorama view which allows the user to look around in a spherical image by rotating his smartphone. I used Rajawali's Skybox for this together with the TYPE_ROTATION_VECTOR sensor. I got it working, but only when I look forward (it's literally based on my rotation (yaw)) This is the behavior: looking forward: yaw = yaw, pitch = pitch and roll = roll looking to the left: yaw = yaw, pitch = roll and roll = pitch looking backwards: yaw = yaw, pitch = pitch * -1 and roll = roll *

问题 Using the following XAML: <Grid x:Name="grid" Background="LightBlue" ClipToBounds="True"> <Grid.RowDefinitions> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Viewbox x:Name="imgViewbox" > <InkCanvas Grid.Row="0" Name="inkCanvas" Background="Red" > <Image Source="Images/pic.png" HorizontalAlignment="Left" x:Name="imgObject" VerticalAlignment="Top" /> <Label>Testing</Label> </InkCanvas> </Viewbox> </Grid> I am trying to rotate around the center of the image and also use the wheel mouse

问题 First of all I would like to say I am a complete beginner to jquery. I would like to make these divs move round in a circle in a clockwise direction with a 500px diameter. How could i go about doing this? <div id="move0" class="textBox"></div> <div id="move1" class="textBox"></div> <div id="move2" class="textBox"></div> <div id="move3" class="textBox"></div> Please look at my website http://tragicclothing.co.uk/T-Shirts.html This is what I want to be able to happen Steps: Click on button in

问题 Pulling my hair out here. So I'm working with an application that has several types of drawables, and I have them in a structure like so: res/ //Portrait resources drawable-mdpi/ drawable-hdpi/ drawable-xhdpi/ //Landscape resources drawable-land-mdpi/ drawable-land-hdpi/ drawable-land-xhdpi/ EDIT I've also tried even putting the portrait-specific drawables under drawable-port-mdpi , etc. with the same result. And I have a custom View which I'm using to pull in drawables at runtime. Here's a

问题 I have tried this: g.RotateTransform(degrees); But nothing happens.I have one graphics object and one rectangle object witch im drawing using this method: g.FillRectangle(new TextureBrush(Image.FromFile(@"D:\LOVE&LUA\Pictures\yellowWool.png")), rectangle); And i need to rotate the rectangle somehow and draw it again. Answer with code sample please and with a simple explanation. EDIT: Here is the actual code I'm using: public void Draw(Graphics g,PointF location,Color clearColor) { rectangle

问题 First off, I am currently using JQuery so JQuery solutions viable. I want to rotate an image by a dynamic X degrees which is calculated every sec. Now I had this working perfectly using this JqueryRotate plugin The image is rotated perfectly every sec. But I am trying something a little more complicated now. I want to rotate 4 transparent images on top of each other. Currently I have four <img> tags all correctly aligned and looking nice and pretty ^_^ but using the JqueryRotate plugin that I

问题 I have a scene which contains objects located anywhere in space and I'm making a trackball-like interface. I'd like to make it so that I can move 2 separate sliders to rotate it in x and y axes respectively: glRotatef(drawRotateY,0.0,1.0f,0); glRotatef(drawRotateX,1.0f,0.0,0.0); //draw stuff in space However, the above code won't work because X rotation will then be dependent on the Y rotation. How can I achieve this without using gluLookAt()? Edit: I'd like to say that my implementation is