code: def matrix_coords(rows, cols, rowh, colw, ox=0, oy=0):
      "Generate coords for a matrix of rects"
      for i, f, c in rowmajor(rows, cols):
          x = ox + c * colw
          y = oy + f * rowh
          x1 = x + colw
          y1 = y + rowh
          yield (i, x, y, x1, y1f matrix_coords(rows, cols, rowh, colw, ox=0, oy=0):
      "Generate coords for a matrix of rects"
      for i, f, c in rowmajor(rows, cols):
          x = ox + c * colw
          y = oy + f * rowh
          x1 = x + colw
          y1 = y + rowh
          yield (i, x, y, x1, y1)
docs: Generate coords for a matrix of rects