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Wang Dequan
171
lib/python/hershey.py
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171
lib/python/hershey.py
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# This is a component of AXIS, a front-end for emc
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# Copyright 2005, 2006 Chris Radek <chris@timeguy.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import itertools
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translate = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, '-': 10, '.': 11, 'X': 12, 'Y': 13, 'Z': 14, 'G': 15,
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'U': 16, 'V': 17, 'W': 18}
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class Hershey:
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def __init__(self):
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self.hershey = (
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# 0
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[[(240.0, 20.0), (180.0, 40.0), (140.0, 100.0), (120.0, 200.0),
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(120.0, 260.0), (140.0, 360.0), (180.0, 420.0), (240.0, 440.0),
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(280.0, 440.0), (340.0, 420.0), (380.0, 360.0), (400.0, 260.0),
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(400.0, 200.0), (380.0, 100.0), (340.0, 40.0), (280.0, 20.0),
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(240.0, 20.0)]],
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# 1
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[[(120.0, 100.0), (160.0, 80.0), (220.0, 20.0), (220.0, 440.0)]],
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# 2
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[[(140.0, 120.0), (140.0, 100.0), (160.0, 60.0), (180.0, 40.0),
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(220.0, 20.0), (300.0, 20.0), (340.0, 40.0), (360.0, 60.0),
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(380.0, 100.0), (380.0, 140.0), (360.0, 180.0), (320.0, 240.0),
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(120.0, 440.0), (400.0, 440.0)]],
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# 3
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[[(160.0, 20.0), (380.0, 20.0), (260.0, 180.0), (320.0, 180.0),
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(360.0, 200.0), (380.0, 220.0), (400.0, 280.0), (400.0, 320.0),
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(380.0, 380.0), (340.0, 420.0), (280.0, 440.0), (220.0, 440.0),
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(160.0, 420.0), (140.0, 400.0), (120.0, 360.0)]],
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# 4
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[[(320.0, 20.0), (120.0, 300.0), (420.0, 300.0)], [(320.0, 20.0),
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(320.0, 440.0)]],
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# 5
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[[(360.0, 20.0), (160.0, 20.0), (140.0, 200.0), (160.0, 180.0),
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(220.0, 160.0), (280.0, 160.0), (340.0, 180.0), (380.0, 220.0),
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(400.0, 280.0), (400.0, 320.0), (380.0, 380.0), (340.0, 420.0),
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(280.0, 440.0), (220.0, 440.0), (160.0, 420.0), (140.0, 400.0),
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(120.0, 360.0)]],
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# 6
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[[(380.0, 80.0), (360.0, 40.0), (300.0, 20.0), (260.0, 20.0),
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(200.0, 40.0), (160.0, 100.0), (140.0, 200.0), (140.0, 300.0),
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(160.0, 380.0), (200.0, 420.0), (260.0, 440.0), (280.0, 440.0),
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(340.0, 420.0), (380.0, 380.0), (400.0, 320.0), (400.0, 300.0),
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(380.0, 240.0), (340.0, 200.0), (280.0, 180.0), (260.0, 180.0),
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(200.0, 200.0), (160.0, 240.0), (140.0, 300.0)]],
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# 7
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[[(400.0, 20.0), (200.0, 440.0)], [(120.0, 20.0), (400.0, 20.0)]],
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# 8
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[[(220.0, 20.0), (160.0, 40.0), (140.0, 80.0), (140.0, 120.0),
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(160.0, 160.0), (200.0, 180.0), (280.0, 200.0), (340.0, 220.0),
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(380.0, 260.0), (400.0, 300.0), (400.0, 360.0), (380.0, 400.0),
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(360.0, 420.0), (300.0, 440.0), (220.0, 440.0), (160.0, 420.0),
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(140.0, 400.0), (120.0, 360.0), (120.0, 300.0), (140.0, 260.0),
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(180.0, 220.0), (240.0, 200.0), (320.0, 180.0), (360.0, 160.0),
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(380.0, 120.0), (380.0, 80.0), (360.0, 40.0), (300.0, 20.0),
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(220.0, 20.0)]],
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# 9
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[[(380.0, 160.0), (360.0, 220.0), (320.0, 260.0), (260.0, 280.0),
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(240.0, 280.0), (180.0, 260.0), (140.0, 220.0), (120.0, 160.0),
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(120.0, 140.0), (140.0, 80.0), (180.0, 40.0), (240.0, 20.0),
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(260.0, 20.0), (320.0, 40.0), (360.0, 80.0), (380.0, 160.0),
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(380.0, 260.0), (360.0, 360.0), (320.0, 420.0), (260.0, 440.0),
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(220.0, 440.0), (160.0, 420.0), (140.0, 380.0)]],
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# -
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[[(80, 260), (440, 260)]],
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# .
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[[(120, 400), (100, 420), (120, 440), (140, 420), (120, 400)]],
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# X
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[[(60, 20), (340, 440)], [(340, 20), (60, 440)]],
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# Y
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[[(40, 20), (200, 220), (200, 440)], [(360, 20), (200, 220)]],
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# Z
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[[(340, 20), (60, 440)], [(60, 20), (340, 20)],
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[(60, 440), (340, 440)]],
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# G
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[[(380.0, 80.0), (360.0, 40.0), (300.0, 20.0), (260.0, 20.0),
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(200.0, 40.0), (160.0, 100.0), (140.0, 200.0), (140.0, 300.0),
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(160.0, 380.0), (200.0, 420.0), (260.0, 440.0), (280.0, 440.0),
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(340.0, 420.0), (380.0, 380.0), (400.0, 320.0),
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(400.0, 280.0), (270.0, 280.0)]],
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# U
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[[(60, 20), (60, 400), (95, 410), (130, 420), (165, 430),
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(200, 440), (200, 440), (235, 430), (270, 420), (305, 410),
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(340, 400), (340, 20)]],
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# V
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[[(60, 20), (200, 440), (340, 20)]],
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# W
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[[(60, 20), (60, 400), (100, 440), (160, 440), (200, 400),
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(240, 440), (300, 440), (340, 400), (340, 20)],
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[(200, 400), (200, 300)]],
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)
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# The preview renderer draws Hershey glyphs through the line shader via
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# string_polylines(); the legacy per-glyph GL display lists (glGenLists/
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# glNewList) and the plot_digit/plot_string draw helpers that used them
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# are gone (they are removed from OpenGL core profiles).
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def string_polylines(self, s, frac=0.0, flip_y=False, flip_z=False,
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bbox=False):
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"""Return a string's strokes as polylines in the local text frame.
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GL-free equivalent of ``plot_string``'s geometry: glyphs are laid out in
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the post-(1/440)-scale frame (each ~1 unit tall) with the same advance
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widths and ``frac`` offset, and the two readability flips applied. The
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caller decides ``flip_y``/``flip_z`` from ``modelview[2][2] < -0.001`` /
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``modelview[1][1] < -0.001`` (the diagonal terms plot_string tests), and
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supplies the outer positioning transform itself. Returns a list of
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polylines, each a list of ``(x, y)`` points.
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"""
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frac_final = frac
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if flip_y:
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frac_final = 1.0 - frac_final
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if flip_z:
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frac_final = 1.0 - frac_final
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slen = self.string_len(s)
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def place(x440, y440):
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gx = x440 / 440.0 - slen * frac_final
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gy = y440 / 440.0
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if flip_z:
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gx, gy = -gx, 1.0 - gy
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if flip_y:
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gx = -gx
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return (gx, gy)
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polylines = []
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if bbox:
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# Same rectangle plot_string draws around the string (in 440-space).
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right = slen * 440.0 + 140.0
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polylines.append([place(-140.0, -140.0), place(right, -140.0),
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place(right, 580.0), place(-140.0, 580.0),
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place(-140.0, -140.0)])
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advance = 0.0
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for c in s:
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digit = self.hershey[translate[c]]
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for stroke in digit:
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polylines.append([place(x + advance, 440.0 - y)
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for x, y in stroke])
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if c == '1':
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advance += 260.0
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elif c == '.':
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advance += 180.0
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else:
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advance += 400.0
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return polylines
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def string_len(self, s):
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l = 0.0
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for c in s:
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if c == '1':
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l += 260.0
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elif c == '.':
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l += 180.0
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else:
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l += 400.0
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return l/440.0
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