OO Graphic Engine, how to add Rotation?

Question

I'm trying to program a simple GameEngine, so far I've created a gameloop (doing stuff, render stuff and wait)
Now I want to add to the rendering process a way to rotate every single object with a different angle
my object would looke like this:
public class GameObject {
     double angle;
    public int x,y;
    public Image picture;
    public MOB(Image pic, int x, int y, double angle) {
              this.picture=pic;
              this.x = x;
              this.y = y;
              this.angle = angle;
}and my graphic engine should now paint those objects (pictures) at x/y and rotated, and there lies my problem.
how can i rotate the objects without rotating the whole panel? do i have to use a buffered image?
and last but not least, is this method efficient?
thx for helping
Ghley

Answer 1

Take a look at the AffineTransform class and the Graphics2D methods rotate, scale, translate etc. Worry about efficiency if you come up against a performance issue. Micro-optimization seldom helps, and can sometimes be deleterious.
a way to rotate every single object with a different angleThe method create (inherited from Graphics) can be useful here.
Remember that angles in Java are in radians, not degrees. The Math class has a static method that could be useful there.
db