gl.glVertex3d (maxX, minY, 0.0);
gl.glColor4f(x3R, x3G, x3B, x3A);
gl.glVertex3d (maxX, maxY, 0.0);
gl.glColor4f(x4R, x4G, x4B, x4A);
gl.glVertex3d (minX, maxY, 0.0);
gl.glEnd ();
}else{
gl.glBegin (GL.GL_QUADS);
gl.glVertex3d (minX, minY, 0.0);
gl.glVertex3d (maxX, minY, 0.0);
gl.glVertex3d (maxX, maxY, 0.0);