Question

Same question as last time but I will provide more detail.
I am currently rotating images using:

 int rotateNum //in main class

 double rotationRequired = Math.toRadians(rotateNum);

    double locationX = img.getWidth(this) / 2;
    double locationY = img.getHeight(this) / 2;
    AffineTransform tx = AffineTransform.getRotateInstance(rotationRequired, locationX, locationY);
    AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);


    g2d.drawImage(op.filter((BufferedImage)img, null), imgX, imgY, null);

And then I am actually rotating the image using:

double deltaX = (double)(imgY - otherImg.imgY);
double deltaY = (double)(imgX - otherImg.imgX);
rotateNum = (int)(180 * Math.atan2(deltaY, deltaX) / Math.PI);

My images vary in size. The smaller images don’t get cut off (meaning cut off with white space) but the larger ones do, on the left or right side. Resizing the images doesn’t work, and I clipped out the white rectangle around the image using the
GIMP.

Example Images:
Before(ignore the grey area to the left)

After:
See the cutoff at the side

Answer 1

I imagine that it’s not the size of the image that matters but rather its eccentricity: images that are more square-like have less of a problem then images that are either more fat or more thin.

I think that your problem is that your center of rotation shouldn’t be [width / 2, height / 2] — it’s not that simple. Instead think of the image residing in the left upper portion of a large square the length of the square’s side will be the image’s width or height, whichever is larger. This is what gets rotated whenever you rotate your image.

For example, please see my reply here: https://stackoverflow.com/a/8720123/522444