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[java] how to rotate an image?

3 posts in this topic

how can you rotate an image? for example, i load a gif image and display it. what do i need to import and what functions can i use to rotate the image. thuned life is unfair, take advantage of it. UNMB2 - if the link doesn't work, try clicking it Edited by - thuned on February 18, 2001 2:14:32 AM

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anyone? too be more specific, i want it rotated around the zaxis
so if i rotate it 180 degrees it''s upsidedown instead of a "line"

life is unfair, take advantage of it.
UNMB2 - if the link doesn''t work, try clicking it

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There''s probably some Java2D functions you can use, but if you''re wanting to do it the old fashioned way, here''s some really old code I''ve dug out - can''t remember where I originally appropriated it from though. Dunno if it will do what you want but it might be helpful...?

Basically convert your image to pixels (use MemoryImageSource/PixelGrabber/whatever), then call this function:

public final byte[] rotate ( byte iPixels[], int degree, int w, int h, boolean imageClear ) {
if (iPixels.length < 1)
return null;

byte p[] = new byte[iPixels.length];

//the following is to avoid repeated calculations
double theta = degree * RADIANS_CALC; //rotation
double tx = w / 2.0; //translation (to rotate about center)
double ty = h / 2.0;
double cos_theta = Math.cos(theta);
double sin_theta = Math.sin(theta);
double dx = tx * (1.0 - cos_theta) + ty * sin_theta;
double dy = ty * (1.0 - cos_theta) - tx * sin_theta;

int i = 0;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
int xp = (int)((cos_theta * x - sin_theta * y + dx) + 0.5);
int yp = (int)((sin_theta * x + cos_theta * y + dy) + 0.5);

if (imageClear) {
if (yp < 0)
yp = 0;
else if (yp >= h)
yp = h-1;

if (xp < 0)
xp = 0;
else if (xp >= w)
xp = w-1;

if (yp >= 0 && yp < h && xp >= 0 && xp < w) {
int dst = yp * w + xp;
p = iPixels[dst];


return p;

Convert the returned array back into an image.


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