Current File : //usr/share/doc/python3-freetype/examples/hello-vf.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# Variable Font example - Copyright 2020 Josh Hadley, based on hello-world.py
# Distributed under the terms of the new BSD license.
#
# -----------------------------------------------------------------------------
from freetype import *
if __name__ == '__main__':
import numpy
import matplotlib.pyplot as plt
face = Face('./SourceSansVariable-Roman.otf')
text = 'Hello variable fonts!'
face.set_char_size( 48*64 )
slot = face.glyph
face.set_var_design_coords((900,)) # set to widest for width calc.
# First pass to compute bbox
width, height, baseline = 0, 0, 0
previous = 0
for i,c in enumerate(text):
face.load_char(c)
bitmap = slot.bitmap
height = max(height,
bitmap.rows + max(0,-(slot.bitmap_top-bitmap.rows)))
baseline = max(baseline, max(0,-(slot.bitmap_top-bitmap.rows)))
kerning = face.get_kerning(previous, c)
width += (slot.advance.x >> 6) + (kerning.x >> 6)
previous = c
height *= 12
Z = numpy.zeros((height,width), dtype=numpy.ubyte)
# Second pass for actual rendering. Iterate through some weight axis values
# and render the result, one per line.
for i, wght in enumerate((900, 750, 675, 600, 500, 450, 325, 275, 100)):
face.set_var_design_coords((wght,)) # set the weight axis value using "design coords"
x, y = 0, 0
previous = 0
for c in text:
face.load_char(c)
bitmap = slot.bitmap
top = slot.bitmap_top
left = slot.bitmap_left
w,h = bitmap.width, bitmap.rows
y = (height - baseline - top) - (i * 48)
kerning = face.get_kerning(previous, c)
x += (kerning.x >> 6)
Z[y:y+h,x+left:x+left+w] += numpy.array(bitmap.buffer, dtype='ubyte').reshape(h,w)
x += (slot.advance.x >> 6)
previous = c
plt.figure(figsize=(10, 10*Z.shape[0]/float(Z.shape[1])))
plt.imshow(Z, interpolation='nearest', origin='upper', cmap=plt.cm.gray)
plt.xticks([]), plt.yticks([])
plt.show()
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