I have a problem i been fighting with over 10 hours today. I have made a program that displays a little triangle att the bottom of the screen pointing up. I know how to rotate it using glRotatef, but how do i move it in the new direction after i rotated it??

Like if i rotated it 30 degrees, and i want the triangle to move in that direction which the tirangle is pointing. Hard to explain maybee… but i would be very happy if someone could help me with this.

this will make the matrix store the triangle status for any time.
you could also use another schemes, like pushing/popping the matrix onto the stack…
but this seems more understandable to me.

you actually rotate, then translate, the turtle, and you save its current position/heading into matrix.

note that this method can be generally used when you need to move an object into space, relatively to its previous state; you tell the object: “move 10 meters forward!” “turn left 30 degrees!”

But i want it to be moved around using the keyboard… Btw i think i solved it already…
but now i have a new problem… When i rotate
the triangel it rotates around the original startingpoint instead of rotating around itself… wierd.

after you have done your movement, im assuming you used a little bit of trig if you didnt use the gl functions this should work for you.
…
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix();