public void prect(Coord c, Coord ul, Coord br, double a) {
st.set(cur2d);
apply();
gl.glEnable(GL2.GL_POLYGON_SMOOTH);
gl.glBegin(GL.GL_TRIANGLE_FAN);
vertex(c);
vertex(c.add(0, ul.y));
double p2 = Math.PI / 2;
all:
{
float tc;
tc = (float) (Math.tan(a) * -ul.y);
if ((a > p2) || (tc > br.x)) {
vertex(c.x + br.x, c.y + ul.y);
} else {
vertex(c.x + tc, c.y + ul.y);
break all;
}
tc = (float) (Math.tan(a - (Math.PI / 2)) * br.x);
if ((a > p2 * 2) || (tc > br.y)) {
vertex(c.x + br.x, c.y + br.y);
} else {
vertex(c.x + br.x, c.y + tc);
break all;
}
tc = (float) (-Math.tan(a - Math.PI) * br.y);
if ((a > p2 * 3) || (tc < ul.x)) {
vertex(c.x + ul.x, c.y + br.y);
} else {
vertex(c.x + tc, c.y + br.y);
break all;
}
tc = (float) (-Math.tan(a - (3 * Math.PI / 2)) * -ul.x);
if ((a > p2 * 4) || (tc < ul.y)) {
vertex(c.x + ul.x, c.y + ul.y);
} else {
vertex(c.x + ul.x, c.y + tc);
break all;
}
tc = (float) (Math.tan(a) * -ul.y);
vertex(c.x + tc, c.y + ul.y);
}
gl.glEnd();
gl.glDisable(GL2.GL_POLYGON_SMOOTH);
checkerr();
}
private EyeViewport initViewportForEye(final FieldOfView fov, final float xOffset) {
final float left = (float) Math.tan(Math.toRadians(fov.getLeft()));
final float right = (float) Math.tan(Math.toRadians(fov.getRight()));
final float bottom = (float) Math.tan(Math.toRadians(fov.getBottom()));
final float top = (float) Math.tan(Math.toRadians(fov.getTop()));
final EyeViewport vp = new EyeViewport();
vp.x = xOffset;
vp.y = 0.0f;
vp.width = left + right;
vp.height = bottom + top;
vp.eyeX = left + xOffset;
vp.eyeY = bottom;
return vp;
}