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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# FreeType high-level python API - Copyright 2011-2015 Nicolas P. Rougier
# Distributed under the terms of the new BSD license.
#
# -----------------------------------------------------------------------------
#
# Direct translation of example 1 from the freetype tutorial:
# http://www.freetype.org/freetype2/docs/tutorial/step1.html
#
import math
import matplotlib.pyplot as plt
from freetype.raw import *
from PIL import Image
WIDTH, HEIGHT = 640, 480
image = Image.new('L', (WIDTH,HEIGHT))
def to_c_str(text):
''' Convert python strings to null terminated c strings. '''
cStr = create_string_buffer(text.encode(encoding='UTF-8'))
return cast(pointer(cStr), POINTER(c_char))
def draw_bitmap( bitmap, x, y):
global image
x_max = x + bitmap.width
y_max = y + bitmap.rows
p = 0
for p,i in enumerate(range(x,x_max)):
for q,j in enumerate(range(y,y_max)):
if i < 0 or j < 0 or i >= WIDTH or j >= HEIGHT:
continue;
pixel = image.getpixel((i,j))
pixel |= int(bitmap.buffer[q * bitmap.width + p]);
image.putpixel((i,j), pixel)
def main():
library = FT_Library()
matrix = FT_Matrix()
face = FT_Face()
pen = FT_Vector()
filename= 'Vera.ttf'
text = 'Hello World !'
num_chars = len(text)
angle = ( 25.0 / 360 ) * 3.14159 * 2
# initialize library, error handling omitted
error = FT_Init_FreeType( byref(library) )
# create face object, error handling omitted
error = FT_New_Face( library, to_c_str(filename), 0, byref(face) )
# set character size: 50pt at 100dpi, error handling omitted
error = FT_Set_Char_Size( face, 50 * 64, 0, 100, 0 )
slot = face.contents.glyph
# set up matrix
matrix.xx = (int)( math.cos( angle ) * 0x10000 )
matrix.xy = (int)(-math.sin( angle ) * 0x10000 )
matrix.yx = (int)( math.sin( angle ) * 0x10000 )
matrix.yy = (int)( math.cos( angle ) * 0x10000 )
# the pen position in 26.6 cartesian space coordinates; */
# start at (300,200) relative to the upper left corner */
pen.x = 200 * 64;
pen.y = ( HEIGHT - 300 ) * 64
for n in range(num_chars):
# set transformation
FT_Set_Transform( face, byref(matrix), byref(pen) )
# load glyph image into the slot (erase previous one)
charcode = ord(text[n])
index = FT_Get_Char_Index( face, charcode )
FT_Load_Glyph( face, index, FT_LOAD_RENDER )
# now, draw to our target surface (convert position)
draw_bitmap( slot.contents.bitmap,
slot.contents.bitmap_left,
HEIGHT - slot.contents.bitmap_top )
# increment pen position
pen.x += slot.contents.advance.x
pen.y += slot.contents.advance.y
FT_Done_Face(face)
FT_Done_FreeType(library)
plt.imshow(image, origin='lower',
interpolation='nearest', cmap=plt.cm.gray)
plt.show()
if __name__ == '__main__':
main()
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