93 lines
3.5 KiB
Python
93 lines
3.5 KiB
Python
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#!/usr/bin/env python3
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"""
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Inkscape extension to create checkerboard patterns
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Copyright (C) 2011 Jeff Kayser
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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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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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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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import inkex
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from lxml import etree
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import re
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from inkex import Color
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def rgbToHex(pickerColor):
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longcolor = int(pickerColor)
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if longcolor < 0:
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longcolor = longcolor & 0xFFFFFFFF
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return '#' + format(longcolor >> 8, '06X')
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def draw_square(x, y, w, h, color, parent, id_=None):
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"""Draw a w*h square at (x, y) having color color
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"""
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if len(color) == 4:
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opacity=color[3]
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else:
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opacity=1.0
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style = {'stroke': 'none', 'stroke-width': '1', 'fill': rgbToHex(color), 'fill-opacity': opacity}
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attribs = {'style': str(inkex.Style(style)), 'height': str(h), 'width': str(w), 'x': str(x), 'y': str(y)}
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if id_ is not None:
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attribs.update({'id': id_})
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obj = etree.SubElement(parent, inkex.addNS('rect', 'svg'), attribs)
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def draw_grid(x, y, rows, cols, size, color1, color2, parent):
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"""Draw a rows*cols checkboard grid at (x, y) with square size of size*size,
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with squares having alternating colors color1 and color2
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"""
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# Group like-colors
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group1 = etree.SubElement(parent, 'g', {'id': 'diagonal1'})
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group2 = etree.SubElement(parent, 'g', {'id': 'diagonal2'})
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for row in range(int(rows)):
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for col in range(int(cols)):
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alternate = (col + row) % 2 == 0
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color = color1 if alternate else color2
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group = group1 if alternate else group2
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id_ = 'cell{0}x{1}'.format(col, row)
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draw_square(x + col * size, y + row * size, size, size, color, group, id_)
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class Checkerboard(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument("--tab")
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pars.add_argument("--color1", type=Color, default=4286282751)
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pars.add_argument("--color2", type=Color, default=8092671)
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pars.add_argument("--size")
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pars.add_argument("--rows", type=int)
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pars.add_argument("--cols", type=int)
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pars.add_argument("--layer", type=inkex.Boolean)
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def effect(self):
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if self.svg.get_current_layer() is not None:
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group = etree.SubElement(self.svg.get_current_layer(), 'g', {'id': 'checkerboard'})
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else:
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parent = self.document.getroot()
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group = etree.SubElement(parent, 'g', {'id': 'checkerboard'})
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rows = self.options.rows
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cols = self.options.cols
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# Convert to pixels
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size = self.svg.unittouu(self.options.size)
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color1 = self.options.color1
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color2 = self.options.color2
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# Center checkerboard within visible viewport
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x, y = self.svg.namedview.center[0] - cols * size / 2, self.svg.namedview.center[1] - rows * size / 2
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draw_grid(x, y, rows, cols, size, color1, color2, group)
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if __name__ == '__main__':
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Checkerboard().run()
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