def _render_text(self):
"""This is a helper method to render text to a surface with wrapping."""
if self._autowidth:
# "autowidth" means one line, no wrapping, and the left edge
# stays in the same place
textlines = [self.text]
textheight = self.font.get_linesize()
oldleft = self.left
self.width = self.font.size(self.text)[0]
self.x = oldleft + self.width / 2.
else:
textlines = self._wrap(self.text)
textheight = len(textlines) * self.font.get_linesize()
textwidth = self.width
self.height = textheight
# fix in case we're drawing black text
if self.background is None and self.color == Game.rgb(0, 0, 0):
ALPHA = Game.Constants.SRCALPHA
else:
ALPHA = 0
surf = Game.Surface((textwidth, textheight), ALPHA)
for lineno, line in enumerate(textlines):
if self.background is not None:
r = self.font.render(line, self.antialias, self.color,
self.background)
else:
r = self.font.render(line, self.antialias, self.color)
surf.blit(r, (0, lineno * self.font.get_linesize()))
self.pixels = surf
if self.background is None:
# per-pixel alphas override colorkeys, so this line won't do anything
# if the text is black
self.pixels.set_colorkey((0, 0, 0), Game.Constants.RLEACCEL)
self.redraw()
