Java Rotating Images

Question

I need to be able to rotate images individually in java   The only thing I have found so far is g2d drawImage image  affinetransform  ImageObserver    Unfortunately  I need to draw the image at a specific point  and there is no method with an argument that 1 rotates the image separately and 2  allows me to set the x and y  any help is appreciated

User · Answer

public static BufferedImage rotateCw  BufferedImage img         int         width    img getWidth        int         height   img getHeight        BufferedImage   newImage   new BufferedImage  height  width  img getType           for  int i 0   i  lt  width   i             for  int j 0   j  lt  height   j                 newImage setRGB  height-1-j  i  img getRGB i j          return newImage      from https   coderanch com t 485958 java Rotating-buffered-image

User · Answer

This is how you can do it  This code assumes the existance of a buffered image called  image   like your comment says      The required drawing location int drawLocationX   300  int drawLocationY   300      Rotation information  double rotationRequired   Math toRadians  45   double locationX   image getWidth     2  double locationY   image getHeight     2  AffineTransform tx   AffineTransform getRotateInstance rotationRequired  locationX  locationY   AffineTransformOp op   new AffineTransformOp tx  AffineTransformOp TYPE BILINEAR       Drawing the rotated image at the required drawing locations g2d drawImage op filter image  null   drawLocationX  drawLocationY  null

User · Answer

AffineTransform instances can be concatenated  added together    Therefore you can have a transform that combines  shift to origin    rotate  and  shift back to desired position

User · Answer

A simple way to do it without the use of such a complicated draw statement         Make a backup so that we can reset our graphics object after using it      AffineTransform backup   g2d getTransform          rx is the x coordinate for rotation  ry is the y coordinate for rotation  and angle       is the angle to rotate the image  If you want to rotate around the center of an image        use the image s center x and y coordinates for rx and ry      AffineTransform a   AffineTransform getRotateInstance angle  rx  ry         Set our Graphics2D object to the transform     g2d setTransform a         Draw our image like normal     g2d drawImage image  x  y  null         Reset our graphics object so we can draw with it again      g2d setTransform backup

User · Answer

Sorry  but all the answers are difficult to understand for me as a beginner in graphics    After some fiddling  this is working for me and it is easy to reason about   Override public void draw Graphics2D g        AffineTransform tr   new AffineTransform           X and Y are the coordinates of the image     tr translate  int getX     int getY         tr rotate              Math toRadians this rotationAngle               img getWidth     2              img getHeight     2                img is a BufferedImage instance     g drawImage img  tr  null      I suppose that if you want to rotate a rectangular image this method wont work and will cut the image  but I thing you should create square png images and rotate that

[java] Java: Rotating Images

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