Coordinate Grids

Cartesian grids fill a coordinate rectangle, and have a specified number of lines in each direction. A polar grid has specified radius, rings, and sectors.

  grid(n1, n2);         // fills the bounding box
  grid(p1, p2, n1, n2); // fills the box with corners p1, p2
  grid(p1, p2, mesh(n1, n2), mesh(m1,m2));
  polar_grid(r, n1, n2);

Each command draws an n1 by n2 grid. The third uses an $m_1\times m_2$ mesh, which is useful only if the camera lens does not map lines in object space to lines on the screen.

Graph paper may be created by superimposing grids:

  pen(0.25);
  grid(10*x_size, 10*y_size);
  pen(0.5);
  grid(2*x_size, 2*y_size);
  pen(1);
  grid(x_size, y_size);

        

S. D. Pedersen's contrib/ package provides enhanced Cartesian graphs. See contrib/doc in the source for documentation.