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show_angles.py
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show_angles.py
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# Copyright 2007 Mitchell N. Charity
# Copyright 2009 Walter Bender
#
# This file is part of Ruler.
#
# Ruler is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ruler is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ruler. If not, see <http://www.gnu.org/licenses/>
from math import pi, sin, cos
import cairo
from util import mm, dimensions_mm, set_background_color, set_color, \
get_hardware
def d2r(d):
""" degrees to radians """
return d / 180.0 * pi
class Angles90():
def __init__(self, font, font_bold, w, h):
self.font = font
self.font_bold = font_bold
self.w = w
self.h = h
self.hw = get_hardware()
def draw(self, c, dpi):
set_background_color(c, self.w, self.h)
c.set_antialias(cairo.ANTIALIAS_GRAY)
nw, nh = dimensions_mm(dpi, self.w, self.h)
if self.hw[0:2] == 'xo':
scale = 1.
else:
scale = 200./nh
ox = mm(dpi, 0)
oy = mm(dpi, 99 * scale)
d = mm(dpi, 90 * scale)
def xy(angle, m=d):
return cos(-angle) * m + ox, sin(-angle) * m + oy
def ray(angle, r0=0, r1=d):
c.move_to(*xy(angle, r0))
c.line_to(*xy(angle, r1))
lw = 6
c.set_line_width(lw)
c.move_to(ox, oy + lw / 2)
c.line_to(*xy(pi / 2))
ray(0)
c.stroke()
c.save()
c.set_line_width(3)
c.set_dash([mm(dpi, 5)])
ray(pi / 4)
c.stroke()
c.restore()
c.set_line_width(4)
for a in range(10, 81, 10):
ray(d2r(a), mm(dpi, 10 * scale), mm(dpi, 85 * scale))
c.stroke()
c.set_line_width(2)
for a in range(10, 81, 10):
ray(d2r(a), mm(dpi, 3 * scale), mm(dpi, 20 * scale))
c.stroke()
c.set_line_width(2)
for a in range(1, 90, 1):
ray(d2r(a), mm(dpi, 70 * scale), mm(dpi, 80 * scale))
c.stroke()
c.set_line_width(2)
for a in range(0, 90, 5):
ray(d2r(a), mm(dpi, 20 * scale), mm(dpi, 81 * scale))
c.stroke()
class Angles360():
def __init__(self, font, font_bold, w, h):
self.font = font
self.font_bold = font_bold
self.w = w
self.h = h
self.hw = get_hardware()
def draw(self, c, dpi):
set_background_color(c, self.w, self.h)
c.set_antialias(cairo.ANTIALIAS_GRAY)
nw, nh = dimensions_mm(dpi, self.w, self.h)
if self.hw[0:2] == 'xo':
scale = 1.
else:
scale = 200./nh
ox = mm(dpi, nw / 2)
oy = mm(dpi, nh / 2)
d = mm(dpi, 44 * scale)
def xy(angle, m=d):
return cos(-angle) * m + ox, sin(-angle) * m + oy
def ray(angle, r0=0, r1=d):
c.move_to(*xy(angle, r0))
c.line_to(*xy(angle, r1))
def annulus(a0, a1, r0, r1):
c.move_to(*xy(a0, r0))
c.arc_to(ox, oy, r0, a0, a1)
c.rel_line_to(*xy(a1, r1))
c.arc_to(ox, oy, r1, a1, a0)
c.close_path()
def rays(step, r0=0, r1=d, w=1):
c.save()
c.set_line_width(w)
for a in range(0, 360, step):
ray(d2r(a), r0, r1)
c.stroke()
c.restore()
rays(1, mm(dpi, 35 * scale), w=2, r1=mm(dpi, 43 * scale))
rays(5, mm(dpi, 10 * scale), w=2)
rays(10, mm(dpi, 10 * scale), w=4)
# rays(10, mm(dpi, 3), mm(dpi, 20), w=2)
c.save()
#c.set_dash([mm(dpi, 5)])
set_color(c, 'dark gray')
rays(45, 0, mm(dpi, 45 * scale), w=6)
c.restore()
rays(90, 0, mm(dpi, 45 * scale), w=6)