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# Copyright 2007 Mitchell N. Charity
# Copyright 2009 Walter Bender
# Copyright 2012 Aneesh Dogra <lionaneesh@gmail.com>
#
# 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/>
import cairo
from util import mm, dimensions_mm, set_background_color, write, get_hardware
import os.path
from gettext import gettext as _
class ScreenOfRulers():
def __init__(self, font, font_bold, w, h):
self.font = font
self.font_bold = font_bold
self.w = w
self.h = h
self.custom_unit_in_mm = 24.5 # precise upto 2 decimal places
self.hw = get_hardware()
self.offset_of_xo_side_from_screen = 0
self.dpi = 0
def draw(self, c, dpi):
self.c = c
self.dpi = dpi
set_background_color(c, self.w, self.h)
nw, nh = dimensions_mm(dpi, self.w, self.h)
c.set_antialias(cairo.ANTIALIAS_GRAY)
self.draw_ruler_pair(c, dpi, mm(dpi, 20))
# Only calculate offsets if on an OLPC XO-1, 1.5, 1.75
# Not applicable to XO 3.0
if self.hw[0:2] == 'xo' and dpi in [200, 201]:
self.offset_of_xo_side_from_screen = mm(dpi, -38.5)
c.move_to(self.offset_of_xo_side_from_screen, mm(dpi, 65))
self.draw_cm_ruler(c, dpi, 180)
c.save()
c.move_to(mm(dpi, 20), mm(dpi, 75))
write(c, _('Use this ruler from the outside edge of the computer.'),
self.font, mm(dpi, 4))
c.restore()
offset_of_molding_from_screen = mm(dpi, -0.4)
c.move_to(offset_of_molding_from_screen, mm(dpi, 95))
self.draw_cm_ruler(c, dpi, 150)
else:
self.offset_of_xo_side_from_screen = mm(dpi, 0)
c.move_to(self.offset_of_xo_side_from_screen, mm(dpi, 65))
self.draw_cm_ruler(c, dpi, int(nw / 10 * 10))
self.draw_custom_ruler(self.custom_unit_in_mm,
int(nw / 10 * 10))
def draw_ruler_pair(self, c, dpi, y):
c.move_to(mm(dpi, 10), y)
self.connect_rulers(c, dpi)
c.move_to(mm(dpi, 10), y)
self.draw_cm_ruler(c, dpi)
c.move_to(mm(dpi, 10), y+mm(dpi, 10))
self.draw_mm_ruler(c, dpi)
def connect_rulers(self, c, dpi):
c.save()
c.set_line_cap(cairo.LINE_CAP_SQUARE)
c.translate(*c.get_current_point())
c.set_line_width(1)
for xm in range(0, 130+1, 10):
c.move_to(mm(dpi, xm), 0)
c.rel_line_to(0, mm(dpi, 10))
c.stroke()
c.set_line_width(2)
c.move_to(0, 0)
c.rel_line_to(0, mm(dpi, 10))
c.stroke()
c.restore()
def draw_cm_ruler(self, c, dpi, width=130):
c.save()
c.set_line_cap(cairo.LINE_CAP_SQUARE)
c.translate(*c.get_current_point())
c.set_line_width(5)
c.move_to(0, 0)
c.line_to(mm(dpi, width), 0)
for x in [mm(dpi, xm) for xm in range(0, width+1, 10)]:
c.move_to(x, 0)
c.rel_line_to(0, mm(dpi, -3))
c.stroke()
for x, xm in [(mm(dpi, xm), xm) for xm in range(0, width+1, 10)]:
n = xm/10
c.move_to(x, mm(dpi, -4))
write(c, "%d" % n, self.font_bold, mm(dpi, 2.5), centered=True)
c.move_to(mm(dpi, 1.5), mm(dpi, -4))
write(c, "cm", self.font_bold, mm(dpi, 2))
c.restore()
# units_per_mm is precise upto 2 decimal places
def draw_custom_ruler(self, units_per_mm, width=130):
self.c.set_source_rgb(255, 255, 255)
self.c.rectangle(0, mm(self.dpi, 85),
width, mm(self.dpi, 85) + 10)
self.c.fill()
self.c.set_source_rgb(0, 0, 0)
self.c.move_to(self.offset_of_xo_side_from_screen, mm(self.dpi, 85))
self.c.save()
self.c.set_line_cap(cairo.LINE_CAP_SQUARE)
self.c.translate(*self.c.get_current_point())
self.c.set_line_width(5)
self.c.move_to(0, 0)
self.c.line_to(mm(self.dpi, width), 0)
for x in [mm(self.dpi, xm / 100) for xm in xrange(0, (width+1) * 100,
int(units_per_mm * 100))]:
self.c.move_to(x, 0)
self.c.rel_line_to(0, mm(self.dpi, -3))
self.c.stroke()
pt_list = [x / int(units_per_mm * 100) for x in \
range(0, (width + 1) * 100, int(units_per_mm * 100))]
coord_list = [mm(self.dpi, xm / 100) for xm in range(0, (width + 1) * 100,
int(units_per_mm * 100))]
for a in range(0, len(coord_list)):
xm = pt_list[a]
x = coord_list[a]
n = xm
self.c.move_to(x, mm(self.dpi, -4))
write(self.c, "%d" % n, self.font_bold, mm(self.dpi, 2.5), centered=True)
self.c.move_to(mm(self.dpi, 1.5), mm(self.dpi, -4))
write(self.c, "unit", self.font_bold, mm(self.dpi, 2))
self.c.restore()
def draw_mm_ruler(self, c, dpi, width=130):
c.save()
c.set_line_cap(cairo.LINE_CAP_SQUARE)
c.translate(*c.get_current_point())
c.move_to(0, 0)
c.set_line_width(4)
c.line_to(mm(dpi, width), 0)
for x in [mm(dpi, xm) for xm in range(0, width+1, 10)]:
c.move_to(x, 0)
c.rel_line_to(0, mm(dpi, 3))
c.stroke()
c.set_line_width(3)
for x in [mm(dpi, xm) for xm in range(0, width, 5)]:
c.move_to(x, 0)
c.rel_line_to(0, mm(dpi, 2.2))
for x in [mm(dpi, xm) for xm in range(0, width, 1)]:
c.move_to(x, 0)
c.rel_line_to(0, mm(dpi, 2))
c.stroke()
base = mm(dpi, 7)
for x, xm in [(mm(dpi, xm), xm) for xm in range(0, width+1, 10)]:
c.move_to(x, base)
write(c, "%d" % xm, self.font, mm(dpi, 2), centered=True)
c.move_to(mm(dpi, 1.2), base)
write(c, "mm", self.font, mm(dpi, 1.5))
c.restore()
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