Function _grid_lines

1-grid-world/env.py:30–34

(surf, unit, y_off=0)

def _grid_lines(surf, unit, y_off=0):
    for c in range(WIDTH + 1):
        pygame.draw.line(surf, GRID_LINE, (c * unit, y_off), (c * unit, y_off + HEIGHT * unit))
    for r in range(HEIGHT + 1):
        pygame.draw.line(surf, GRID_LINE, (0, y_off + r * unit), (WIDTH * unit, y_off + r * unit))


def _center(x, y, unit, y_off=0):