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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2007 John Beard john.j.beard@gmail.com
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""
This extension allows you to draw a Cartesian grid in Inkscape.
There is a wide range of options including subdivision, subsubdivions and
logarithmic scales. Custom line widths are also possible.
All elements are grouped with similar elements (eg all x-subdivs)
"""
from math import log
import inkex
from inkex import Group, PathElement, Rectangle
def draw_line(x1, y1, x2, y2, width, name, parent):
"""Draw an SVG line"""
line = parent.add(PathElement())
line.style = {'stroke': '#000000', 'stroke-width': str(width), 'fill': 'none'}
line.path = 'M {},{} L {},{}'.format(x1, y1, x2, y2)
line.label = name
def draw_rect(x, y, w, h, width, fill, name, parent):
"""Draw an SVG Rectangle"""
rect = parent.add(Rectangle(x=str(x), y=str(y), width=str(w), height=str(h)))
rect.style = {'stroke': '#000000', 'stroke-width': str(width), 'fill': fill}
rect.label = name
class GridCartesian(inkex.GenerateExtension):
def add_arguments(self, pars):
pars.add_argument("--border_th", type=float, default=3)
pars.add_argument("--border_th_unit", default="cm")
pars.add_argument("--tab", default="x_tab")
pars.add_argument("--x_divs", type=int, default=6)
pars.add_argument("--dx", type=float, default=100.0)
pars.add_argument("--dx_unit", default="cm")
pars.add_argument("--x_subdivs", type=int, default=2)
pars.add_argument("--x_log", type=inkex.Boolean, default="false")
pars.add_argument("--x_subsubdivs", type=int, default=5)
pars.add_argument("--x_half_freq", type=int, default=4)
pars.add_argument("--x_divs_th", type=float, default=2)
pars.add_argument("--x_subdivs_th", type=float, default=1)
pars.add_argument("--x_subsubdivs_th", type=float, default=0.3)
pars.add_argument("--x_div_unit", default="cm")
pars.add_argument("--y_divs", type=int, default=5)
pars.add_argument("--dy", type=float, default=100.0)
pars.add_argument("--dy_unit", default="cm")
pars.add_argument("--y_subdivs", type=int, default=1)
pars.add_argument("--y_log", type=inkex.Boolean, default="false")
pars.add_argument("--y_subsubdivs", type=int, default=5)
pars.add_argument("--y_half_freq", type=int, default=4)
pars.add_argument("--y_divs_th", type=float, default=2)
pars.add_argument("--y_subdivs_th", type=float, default=1)
pars.add_argument("--y_subsubdivs_th", type=float, default=0.3)
pars.add_argument("--y_div_unit", default="cm")
def generate(self):
self.options.border_th = self.svg.unittouu(str(self.options.border_th) + self.options.border_th_unit)
self.options.dx = self.svg.unittouu(str(self.options.dx) + self.options.dx_unit)
self.options.x_divs_th = self.svg.unittouu(str(self.options.x_divs_th) + self.options.x_div_unit)
self.options.x_subdivs_th = self.svg.unittouu(str(self.options.x_subdivs_th) + self.options.x_div_unit)
self.options.x_subsubdivs_th = self.svg.unittouu(str(self.options.x_subsubdivs_th) + self.options.x_div_unit)
self.options.dy = self.svg.unittouu(str(self.options.dy) + self.options.dy_unit)
self.options.y_divs_th = self.svg.unittouu(str(self.options.y_divs_th) + self.options.y_div_unit)
self.options.y_subdivs_th = self.svg.unittouu(str(self.options.y_subdivs_th) + self.options.y_div_unit)
self.options.y_subsubdivs_th = self.svg.unittouu(str(self.options.y_subsubdivs_th) + self.options.y_div_unit)
# find the pixel dimensions of the overall grid
ymax = self.options.dy * self.options.y_divs
xmax = self.options.dx * self.options.x_divs
# Embed grid in group
# Put in in the centre of the current view
grid = Group.new("GridCartesian:X{0.x_divs}:Y{0.y_divs}".format(self.options))
(pos_x, pos_y) = self.svg.namedview.center
grid.transform.add_translate(pos_x - xmax / 2.0, pos_y - ymax / 2.0)
# Group for major x gridlines
majglx = grid.add(Group.new("MajorXGridlines"))
# Group for major y gridlines
majgly = grid.add(Group.new("MajorYGridlines"))
# Group for minor x gridlines
if self.options.x_subdivs > 1: # if there are any minor x gridlines
minglx = grid.add(Group.new("MinorXGridlines"))
# Group for subminor x gridlines
if self.options.x_subsubdivs > 1: # if there are any minor minor x gridlines
mminglx = grid.add(Group.new("SubMinorXGridlines"))
# Group for minor y gridlines
if self.options.y_subdivs > 1: # if there are any minor y gridlines
mingly = grid.add(Group.new("MinorYGridlines"))
# Group for subminor y gridlines
if self.options.y_subsubdivs > 1: # if there are any minor minor x gridlines
mmingly = grid.add(Group.new("SubMinorYGridlines"))
draw_rect(0, 0, xmax, ymax, self.options.border_th,
'none', 'Border', grid) # border rectangle
# DO THE X DIVISIONS======================================
sd = self.options.x_subdivs # sub divs per div
ssd = self.options.x_subsubdivs # subsubdivs per subdiv
for i in range(0, self.options.x_divs): # Major x divisions
if i > 0: # don't draw first line (we made a proper border)
draw_line(self.options.dx * i, 0,
self.options.dx * i, ymax,
self.options.x_divs_th,
'MajorXDiv' + str(i), majglx)
if self.options.x_log: # log x subdivs
for j in range(1, sd):
if j > 1: # the first loop is only for subsubdivs
draw_line(self.options.dx * (i + log(j, sd)), 0,
self.options.dx * (i + log(j, sd)), ymax,
self.options.x_subdivs_th,
'MinorXDiv' + str(i) + ':' + str(j), minglx)
for k in range(1, ssd): # subsub divs
if (j <= self.options.x_half_freq) or (k % 2 == 0): # only draw half the subsubdivs past the half-freq point
if (ssd % 2 > 0) and (j > self.options.y_half_freq): # half frequency won't work with odd numbers of subsubdivs,
ssd2 = ssd + 1 # make even
else:
ssd2 = ssd # no change
draw_line(self.options.dx * (i + log(j + k / float(ssd2), sd)), 0,
self.options.dx * (i + log(j + k / float(ssd2), sd)), ymax,
self.options.x_subsubdivs_th, 'SubminorXDiv' + str(i) + ':' + str(j) + ':' + str(k), mminglx)
else: # linear x subdivs
for j in range(0, sd):
if j > 0: # not for the first loop (this loop is for the subsubdivs before the first subdiv)
draw_line(self.options.dx * (i + j / float(sd)), 0,
self.options.dx * (i + j / float(sd)), ymax,
self.options.x_subdivs_th,
'MinorXDiv' + str(i) + ':' + str(j), minglx)
for k in range(1, ssd): # subsub divs
draw_line(self.options.dx * (i + (j * ssd + k) / (float(sd) * ssd)), 0,
self.options.dx * (i + (j * ssd + k) / (float(sd) * ssd)), ymax,
self.options.x_subsubdivs_th,
'SubminorXDiv' + str(i) + ':' + str(j) + ':' + str(k), mminglx)
# DO THE Y DIVISIONS========================================
sd = self.options.y_subdivs # sub divs per div
ssd = self.options.y_subsubdivs # subsubdivs per subdiv
for i in range(0, self.options.y_divs): # Major y divisions
if i > 0: # don't draw first line (we will make a border)
draw_line(0, self.options.dy * i,
xmax, self.options.dy * i,
self.options.y_divs_th,
'MajorYDiv' + str(i), majgly)
if self.options.y_log: # log y subdivs
for j in range(1, sd):
if j > 1: # the first loop is only for subsubdivs
draw_line(0, self.options.dy * (i + 1 - log(j, sd)),
xmax, self.options.dy * (i + 1 - log(j, sd)),
self.options.y_subdivs_th,
'MinorXDiv' + str(i) + ':' + str(j), mingly)
for k in range(1, ssd): # subsub divs
if (j <= self.options.y_half_freq) or (k % 2 == 0): # only draw half the subsubdivs past the half-freq point
if (ssd % 2 > 0) and (j > self.options.y_half_freq): # half frequency won't work with odd numbers of subsubdivs,
ssd2 = ssd + 1
else:
ssd2 = ssd # no change
draw_line(0, self.options.dx * (i + 1 - log(j + k / float(ssd2), sd)),
xmax, self.options.dx * (i + 1 - log(j + k / float(ssd2), sd)),
self.options.y_subsubdivs_th,
'SubminorXDiv' + str(i) + ':' + str(j) + ':' + str(k), mmingly)
else: # linear y subdivs
for j in range(0, self.options.y_subdivs):
if j > 0: # not for the first loop (this loop is for the subsubdivs before the first subdiv)
draw_line(0, self.options.dy * (i + j / float(sd)),
xmax, self.options.dy * (i + j / float(sd)),
self.options.y_subdivs_th,
'MinorXYiv' + str(i) + ':' + str(j), mingly)
for k in range(1, ssd): # subsub divs
draw_line(0, self.options.dy * (i + (j * ssd + k) / (float(sd) * ssd)),
xmax, self.options.dy * (i + (j * ssd + k) / (float(sd) * ssd)),
self.options.y_subsubdivs_th,
'SubminorXDiv' + str(i) + ':' + str(j) + ':' + str(k), mmingly)
return grid
if __name__ == '__main__':
GridCartesian().run()
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