static void genshapes(void) {
int s, r;
for (s=0; s<=2; s++) {
copyshape(shapes[s*4], basicshapes[s]);
for (r=1; r<=3; r++)
rotateshape(shapes[s*4+r],shapes[s*4+r-1]);
}
for (s=3; s<=5; s++) {
copyshape (shapes[s*4], basicshapes[s]);
rotateshape(shapes[s*4+1], shapes[s*4]);
copyshape (shapes[s*4+2], shapes[s*4]);
copyshape (shapes[s*4+3], shapes[s*4+1]);
}
copyshape(shapes[6*4], basicshapes[6]);
copyshape(shapes[6*4+1], basicshapes[6]);
copyshape(shapes[6*4+2], basicshapes[6]);
copyshape(shapes[6*4+3], basicshapes[6]);
}
void rotateshape(shape & s, double rotation, point2d centre)
{
//an offset, which will put the center at origin.
point2d foroffset (-centre.x(), -centre.y());
//fist we offset it so that the center would be at origin
moveshape (s, foroffset);
//do a simple rotation
rotateshape (s, rotation);
//offset it back!
moveshape (s, centre);
}
