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  How to make an Image rotate?  (Read 980 times)
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Offline Shuster

Junior Devvie


Projects: 1
Exp: 4-6 months
« Posted 2014-06-26 17:06:47 »
Hey ,
How can I make an image rotate?I want to make a rotation animation.
This is that I have tried but that doesnt work...
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   public void render(Graphics g) {
      AffineTransform at = new AffineTransform();
      Graphics2D g2d = (Graphics2D) g;

      if (type == 1) {
         switch (bodypart) {
         case 1:
            g2d.drawImage(tex.exbodypart1, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart1.getWidth() / 2.0, tex.exbodypart1
                       .getHeight() / 2.0);
            break;
         case 2:
            g2d.drawImage(tex.exbodypart2, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart2.getWidth() / 2.0, tex.exbodypart2
                       .getHeight() / 2.0);
            break;
         case 3:
            g2d.drawImage(tex.exbodypart3, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart3.getWidth() / 2.0, tex.exbodypart3
                       .getHeight() / 2.0);
            break;
         case 4:
            g2d.drawImage(tex.exbodypart4, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart4.getWidth() / 2.0, tex.exbodypart4
                       .getHeight() / 2.0);
            break;
         case 5:
            g2d.drawImage(tex.exbodypart5, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart5.getWidth() / 2.0, tex.exbodypart5
                       .getHeight() / 2.0);
            break;
         case 6:
            g2d.drawImage(tex.exbodypart6, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart6.getWidth() / 2.0, tex.exbodypart6
                       .getHeight() / 2.0);
            break;
         case 7:
            g2d.drawImage(tex.exbodypart7, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart7.getWidth() / 2.0, tex.exbodypart7
                       .getHeight() / 2.0);
            break;
         case 8:
            g2d.drawImage(tex.exbodypart8, (int) x, (int) y, null);
               at.rotate(45.0 * Math.PI / 180.0, tex.exbodypart8.getWidth() / 2.0, tex.exbodypart8
                       .getHeight() / 2.0);
            break;
         }
      }

   }

Thanks Smiley
Offline KevinWorkman

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« Reply #1 - Posted 2014-06-26 17:09:24 »
What have you tried? What did google tell you?

How are you drawing the image? Are you using Java2D, OpenGL, a library or framework?
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Offline Shuster

Junior Devvie


Projects: 1
Exp: 4-6 months
« Reply #2 - Posted 2014-06-26 17:19:10 »
I'm using java2d, I edited the topic.
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Offline KevinWorkman

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« Reply #3 - Posted 2014-06-26 17:21:27 »
Use an AffineTransformOp and pass it into the call to drawImage: http://stackoverflow.com/questions/8639567/java-rotating-images

Edit: There are a bunch of different ways to do this. The above link was just the first result for googling "java rotate image".
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Offline Longarmx

JGO Kernel


Medals: 135
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« Reply #4 - Posted 2014-06-26 17:24:04 »
I think that you also have to call 
g2d.setTransform(at);
right after rotating.
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Offline Jimmt
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« Reply #5 - Posted 2014-06-26 17:24:04 »
Quote from: KevinWorkman on 2014-06-26 17:21:27
Use an AffineTransformOp and pass it into the call to drawImage: http://stackoverflow.com/questions/8639567/java-rotating-images
That was my question, 3 years ago Grin
Offline SHC

JGO Kernel


Medals: 350
Projects: 8
Exp: 7 years
« Reply #6 - Posted 2014-06-26 17:25:16 »
You can use this method. It's from my 
ImageTool
 class.

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/**
 * Rotates an image. Actually rotates a new copy of the image.
 * 
 * @param img The image to be rotated
 * @param angle The angle in degrees
 * @return The rotated image
 */
public static Image rotate(Image img, double angle)
{
    double sin = Math.abs(Math.sin(Math.toRadians(angle))),
           cos = Math.abs(Math.cos(Math.toRadians(angle)));

    int w = img.getWidth(null), h = img.getHeight(null);
    int neww = (int) Math.floor(w * cos + h * sin),
        newh = (int) Math.floor(h * cos + w * sin);

    BufferedImage bimg = toBufferedImage(getEmptyImage(neww, newh));

    Graphics2D g = bimg.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(Math.toRadians(angle), w / 2, h / 2);
    g.drawRenderedImage(toBufferedImage(img), null);
    g.dispose();

    return (Image) bimg;
}

Hope this helps.
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Offline KevinWorkman

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« Reply #7 - Posted 2014-06-26 17:35:42 »
Quote from: Jimmt on 2014-06-26 17:24:04
That was my question, 3 years ago Grin

Creepy. Even creepier is when you're googling and start reading an answer and realize YOU wrote that but completely forgot.
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Offline Shuster

Junior Devvie


Projects: 1
Exp: 4-6 months
« Reply #8 - Posted 2014-06-27 11:29:49 »
Quote from: SHC on 2014-06-26 17:25:16
You can use this method. It's from my 
ImageTool
 class.

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/**
 * Rotates an image. Actually rotates a new copy of the image.
 * 
 * @param img The image to be rotated
 * @param angle The angle in degrees
 * @return The rotated image
 */
public static Image rotate(Image img, double angle)
{
    double sin = Math.abs(Math.sin(Math.toRadians(angle))),
           cos = Math.abs(Math.cos(Math.toRadians(angle)));

    int w = img.getWidth(null), h = img.getHeight(null);
    int neww = (int) Math.floor(w * cos + h * sin),
        newh = (int) Math.floor(h * cos + w * sin);

    BufferedImage bimg = toBufferedImage(getEmptyImage(neww, newh));

    Graphics2D g = bimg.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(Math.toRadians(angle), w / 2, h / 2);
    g.drawRenderedImage(toBufferedImage(img), null);
    g.dispose();

    return (Image) bimg;
}

Hope this helps.


Thats pretty complicated for such an easy task and I have tried it and it didnt work for me for some reason..

Quote from: KevinWorkman on 2014-06-26 17:21:27
Use an AffineTransformOp and pass it into the call to drawImage: http://stackoverflow.com/questions/8639567/java-rotating-images

Edit: There are a bunch of different ways to do this. The above link was just the first result for googling "java rotate image".

Works like a chram, thanks a lot!!
If someone is interested, this the working code:


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   public void render(Graphics g) {
      Graphics2D g2d = (Graphics2D) g;
      BufferedImage image = null;
      if (type == 1) {
         switch (bodypart) {
         case 1:
            image = tex.exbodypart1;
            break;
         case 2:
            image = tex.exbodypart2;
            break;
         case 3:
            image = tex.exbodypart3;
            break;
         case 4:
            image = tex.exbodypart4;
            break;
         case 5:
            image = tex.exbodypart5;
            break;
         case 6:
            image = tex.exbodypart6;
            break;
         case 7:
            image = tex.exbodypart7;
            break;
         case 8:
            image = tex.exbodypart8;
            break;
         }

         i += rotation;
         double rotationRequired = Math.toRadians(i);
         double locationX = image.getWidth(null) / 2;
         double locationY = image.getHeight(null) / 2;
         AffineTransform tx = AffineTransform.getRotateInstance(
               rotationRequired, locationX, locationY);
         AffineTransformOp op = new AffineTransformOp(tx,
               AffineTransformOp.TYPE_BILINEAR);
         g2d.drawImage(op.filter(image, null), (int) x, (int) y, null);

      }

   }
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