How do I add a line as a sprite in pygame?

问题

I want to add a grid to my level that stays with the terrain and not the screen. The way I thought of doing it is to add all the lines that form the grid as sprites and move them with the terrain, but I can't figure out how to represent the line as an image.

I tried to do this myself, but had no success.

EDIT: Here's what I've tried

    class Grid():
    def __init__(self):
        self.grid = pygame.Surface(size)
        self.grid.set_colorkey((0,0,0))

    def draw(self):
        # DRAW TILE LINES ----------------------------------------------------------
        grid_x = 0
        grid_y = 0
        for i in range(total_level_width // TILE_SIZE):
            pygame.draw.aaline(self.grid,BLACK,[grid_x,0],[grid_x,total_level_height])
            pygame.draw.aaline(self.grid,BLACK,[0,grid_x],[total_level_width,grid_y])
            grid_x += TILE_SIZE
            grid_y += TILE_SIZE
        # tile test
        pygame.draw.rect(screen,BLACK,(49*TILE_SIZE,34*TILE_SIZE,TILE_SIZE,TILE_SIZE))
        screen.blit(self.grid,(0,0))

Creating the object:

grid = Grid()

Calling class: (in main program loop)

grid.draw()

回答1:

I had a similar problem while i was trying to do a project. I used the following code to get a line onto a surface and then bliting it onto my screen. I hope this entire function might help you.

def blitBoundary(self):
    """ helper function to blit boundary on screen """

    # create a surface
    self.boundSurf=pygame.Surface((1024,768))
    self.boundSurf.set_colorkey((0,0,0))

            """
    if not self.boundary.closePoly:
        (x,y)=pygame.mouse.get_pos()
        pointList=self.boundary.pointList +[[x,y]]
    else:
        pointList=self.boundary.pointList"""

    if len(pointList)>1:
        pygame.draw.aalines(self.boundSurf, (255,255,255), 
            self.boundary.closePoly , pointList, 1)

    self.screen.blit(self.boundSurf,(0,0))

I was trying to draw a polygon. The commented out the if statement that would be most probably not useful for you. All my lines were in a polygon class object. You might want to look into pygame.draw.aalines function.

来源：https://stackoverflow.com/questions/22874381/how-do-i-add-a-line-as-a-sprite-in-pygame