svgwrite_inkscape_drawing.py

   1 #!/usr/bin/env python
   2 #coding:utf-8
   3 # Author:  ao2
   4 # Purpose: create Inkscape layers with svgwrite
   5 # Created: 26.01.2018
   6 # License: MIT License
   7 # Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
   8
   9 import svgwrite
  10 from svgwrite.data.types import SVGAttribute
  11
  12
  13 class InkscapeDrawing(svgwrite.Drawing):
  14     """An svgwrite.Drawing subclass which supports Inkscape layers"""
  15     def __init__(self, *args, **kwargs):
  16         super(InkscapeDrawing, self).__init__(*args, **kwargs)
  17
  18         inkscape_attributes = {
  19             'xmlns:inkscape': SVGAttribute('xmlns:inkscape',
  20                                            anim=False,
  21                                            types=[],
  22                                            const=frozenset(['http://www.inkscape.org/namespaces/inkscape'])),
  23             'inkscape:groupmode': SVGAttribute('inkscape:groupmode',
  24                                                anim=False,
  25                                                types=[],
  26                                                const=frozenset(['layer'])),
  27             'inkscape:label': SVGAttribute('inkscape:label',
  28                                            anim=False,
  29                                            types=frozenset(['string']),
  30                                            const=[])
  31         }
  32
  33         self.validator.attributes.update(inkscape_attributes)
  34
  35         elements = self.validator.elements
  36
  37         svg_attributes = set(elements['svg'].valid_attributes)
  38         svg_attributes.add('xmlns:inkscape')
  39         elements['svg'].valid_attributes = frozenset(svg_attributes)
  40
  41         g_attributes = set(elements['g'].valid_attributes)
  42         g_attributes.add('inkscape:groupmode')
  43         g_attributes.add('inkscape:label')
  44         elements['g'].valid_attributes = frozenset(g_attributes)
  45
  46         self['xmlns:inkscape'] = 'http://www.inkscape.org/namespaces/inkscape'
  47
  48     def layer(self, **kwargs):
  49         """Create an inkscape layer.
  50
  51         An optional 'label' keyword argument can be passed to set a user
  52         friendly name for the layer."""
  53         label = kwargs.pop('label', None)
  54
  55         new_layer = self.g(**kwargs)
  56         new_layer['inkscape:groupmode'] = 'layer'
  57
  58         if label:
  59             new_layer['inkscape:label'] = label
  60
  61         return new_layer
  62
  63
  64 def main():
  65     svg = InkscapeDrawing('inkscape-test.svg', profile='full', size=(640, 480))
  66
  67     layer = svg.layer(label="Layer one")
  68     svg.add(layer)
  69
  70     line = svg.line((100, 100), (300, 100),
  71                     stroke=svgwrite.rgb(10, 10, 16, '%'),
  72                     stroke_width='10')
  73     layer.add(line)
  74
  75     text = svg.text('Test', insert=(100, 100), font_size='100', fill='red')
  76     layer.add(text)
  77
  78     svg.save()
  79
  80
  81 if __name__ == "__main__":
  82     main()