text_utils.py 文件源码

def render_multiline(self,font,text):
        """
        renders multiline TEXT on the pygame surface SURF with the
        font style FONT.
        A new line in text is denoted by \n, no other characters are 
        escaped. Other forms of white-spaces should be converted to space.

        returns the updated surface, words and the character bounding boxes.
        """
        # get the number of lines
        lines = text.split('\n')
        lengths = [len(l) for l in lines]

        # font parameters:
        line_spacing = font.get_sized_height() + 1

        # initialize the surface to proper size:
        line_bounds = font.get_rect(lines[np.argmax(lengths)])
        fsize = (round(2.0*line_bounds.width), round(1.25*line_spacing*len(lines)))
        surf = pygame.Surface(fsize, pygame.locals.SRCALPHA, 32)

        bbs = []
        space = font.get_rect('O')
        x, y = 0, 0
        for l in lines:
            x = 0 # carriage-return
            y += line_spacing # line-feed

            for ch in l: # render each character
                if ch.isspace(): # just shift
                    x += space.width
                else:
                    # render the character
                    ch_bounds = font.render_to(surf, (x,y), ch)
                    ch_bounds.x = x + ch_bounds.x
                    ch_bounds.y = y - ch_bounds.y
                    x += ch_bounds.width
                    bbs.append(np.array(ch_bounds))

        # get the union of characters for cropping:
        r0 = pygame.Rect(bbs[0])
        rect_union = r0.unionall(bbs)

        # get the words:
        words = ' '.join(text.split())

        # crop the surface to fit the text:
        bbs = np.array(bbs)
        surf_arr, bbs = crop_safe(pygame.surfarray.pixels_alpha(surf), rect_union, bbs, pad=5)
        surf_arr = surf_arr.swapaxes(0,1)
        #self.visualize_bb(surf_arr,bbs)
        return surf_arr, words, bbs