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  [SOLVED] Rotating Slick-Util Textures  (Read 845 times)
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Offline EmanP

Junior Devvie

Projects: 2
Exp: 3 years

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« Posted 2013-08-15 22:56:29 »

Before I post a n00b question on here, I make sure to google it in many forms. Everywhere I look, this is the output:
glRotated(angle, 0, 0, 0);

Now the javadoc says that the parameters are "double angle, double x, double y, double z" respectively. Issue is, all the above code does is warp the image's size.

glRotated(angle, 0, 0, 1);
rotates the image, but, rotates the layer it was drawn upon as well, meaning that it moves it's position on the screen, which does not bode very well for my specific game.

glRotated(angle, x, y, 0/*or 1*/);
this warps the image so that it implodes with the angle going larger.

How can I make it so that the image rotates like the second code example, but stay in the same place?

Signed- EmanP
Offline Jimmt
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« Reply #1 - Posted 2013-08-16 00:05:19 »

I don't know OpenGL or Slick, but it seems like the x/y are the origin to rotate around, and so when you set it as (0, 0) you are rotating around bottom left. To calculate the origin (you probably already know) just take the image x + (imageWidth / 2), and image y + (imageHeight / 2).
Offline davedes
« Reply #2 - Posted 2013-08-16 00:21:25 »

x, y, z is the axis. So you generally will just put (0, 0, 1) if you want to rotate around the z axis.

See here:

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Offline EmanP

Junior Devvie

Projects: 2
Exp: 3 years

Satisfaction never guaranteed.

« Reply #3 - Posted 2013-08-16 11:50:25 »

Alright, so the angle and the z-coords are the only ones that need editing considering I am doing a 2D game, so how would I stop it from rotating in a fixed radius around the origin, and have it stay on the origin whilst rotating, or being able to set the radius it rotates around the origin?

EDIT: That tutorial told me how to translate the position properly, so all is good Cheesy

Signed- EmanP
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