rotate image offscreen

Core Library Questions

jnsnrd

in Core Library Questions • 5 months ago

hi,

i would like to rotate an image offscreen (as in the background) and save it.

i tried the following:

size(640, 480);
PGraphics printerImage;
PImage img = loadImage("shot0.jpg");
printerImage = createGraphics(img.width, img.height);
printerImage.beginDraw();
printerImage.image(img, 0, 0);
printerImage.rotate(radians(90));
// printerImage.updatePixels();
printerImage.endDraw();
img = printerImage.get();
String path = savePath("shots/bpmRotated.jpg");
printerImage.save(path);

however, the saved image is not rotated. nor are any errors thrown.

any ideas?

thanks for any help!

jns

Replies(3)

amnon.owed

The two main problems are that you change the rotation after drawing the image and you don't change the point of origin (around which the rotation takes place). To solve this use translate(width, 0); to move the point of origin to the top-right. Then use rotate(radians(90)); to rotate 90 degrees. Then draw the image to the PGraphics.

jnsnrd

Re: rotate image offscreen

5 months ago

I dont want to display the image.

Just process it and save it. But will try the translation as soon as back on a computer!

amnon.owed

Re: rotate image offscreen

5 months ago

Updated above response to say draw (to the PGraphics) instead of display. Message stays the same.

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