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added support for multiline text drawing

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Alexander Schier 2014-03-29 00:47:17 +01:00 committed by Andrew Murray
parent a09da242fd
commit d626679c23
1 changed files with 42 additions and 0 deletions
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42
PIL/ImageDraw.py
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@ -257,6 +257,9 @@ class ImageDraw(object):
# Draw text.
def text(self, xy, text, fill=None, font=None, anchor=None):
if "\n" in text:
return self.multiline_text(xy, text, fill, font, anchor)
ink, fill = self._getink(fill)
if font is None:
font = self.getfont()
@ -273,10 +276,49 @@ class ImageDraw(object):
mask = font.getmask(text)
self.draw.draw_bitmap(xy, mask, ink)
def multiline_text(self, xy, text, fill=None, font=None, anchor=None,
spacing=0, align="left"):
widths, heights = [], []
max_width = 0
lines = text.split("\n")
for line in lines:
line_width, line_height = self.textsize(line, font)
widths.append(line_width)
max_width = max(max_width, line_width)
heights.append(line_height)
left, top = xy
for idx, line in enumerate(lines):
if align == "left":
pass # left = x
elif align == "center":
left += (max_width - widths[idx]) / 2.0
elif align == "right":
left += (max_width - widths[idx])
else:
assert False, 'align must be either "left", "center" or "right"'
self.text((left, top),
line, fill, font, anchor)
top += heights[idx] + spacing
left = xy[0]
def multiline_textsize(self, text, font=None, spacing=0):
max_width = 0
height = 0
lines = text.split("\n")
for line in lines:
line_width, line_height = self.textsize(line, font)
height += line_height + spacing
max_width = max(max_width, line_width)
return max_width, height
##
# Get the size of a given string, in pixels.
def textsize(self, text, font=None):
if "\n" in text:
return multiline_textsize(text, font)
if font is None:
font = self.getfont()
return font.getsize(text)