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# Author: mozman
# Purpose: svg examples
# Copyright (C) 2010, Manfred Moitzi
# License: MIT License
import svgwrite
PROGNAME = 'defs_test'
STYLESHEET = PROGNAME + '.css'
STYLES = """.red { fill: red; stroke=none; }
.green { fill: green; stroke: none; }
.blue { fill: blue; stroke: yellow; stroke-width: 5; }
.yellow { fill: yellow; stroke: none; }
.text { font-family: serif; fill: white; }
"""
def create_svg(name):
svg_size_width = 900
svg_size_height = 900
font_size = 20
triangle_size = 50
title1 = name + ': Example of creating your own colors and defs/use.'
dwg = svgwrite.Drawing(name, (svg_size_width, svg_size_height), debug=True)
# To separate structure from visual presentation, better use stylesheets
# inline stylesheets requires svgwrite version >= 1.0.1
# available at http://bitbucket.org/mozman/svgwrite
if svgwrite.version >= (1, 0, 1):
dwg.defs.add(dwg.style(STYLES))
else: # or use an external stylesheet
with open(STYLESHEET, 'w') as f:
f.write(STYLES)
dwg.add_stylesheet(STYLESHEET, 'noname')
# Background will be dark but not black so the background does not overwhelm the colors.
dwg.add(dwg.rect(insert=(0, 0), size=('100%', '100%'), fill='grey'))
# http://www.w3.org/TR/SVG11/struct.html#Head
# "sometimes it is desired to define a graphical object and prevent it from being directly
# rendered. it is only there to be referenced elsewhere. To do this, and to allow convenient
# grouping defined content, SVG provides the 'defs' element."
# 1. create template polygons
half_size = triangle_size / 2
points = [
(-half_size, -half_size),
(half_size, -half_size),
(0, triangle_size * 0.433013)
]
# 2. create the symbol
symbol_without_fill = dwg.symbol(id='symbol_without_fill')
# 3. add symbols to the defs section
dwg.defs.add(symbol_without_fill)
# 4. important: define viewbox of the symbol!
symbol_without_fill.viewbox(-half_size, -half_size, triangle_size, triangle_size)
# and define how the symbol should behave on resizing by <use>
# default parameters for fit(horiz="center", vert="middle", scale="meet")
# seems not necessary
# symbol_without_fill.fit()
# 5. add triangles to the symbol containers
symbol_without_fill.add(dwg.polygon(points))
# 6. use symbols - param size is necessary - and only unset params can be overwritten
dwg.add(dwg.use(symbol_without_fill, insert=(200, 200), size=(triangle_size, triangle_size), class_='yellow'))
dwg.add(dwg.use(symbol_without_fill, insert=(300, 300), size=(triangle_size*1.2, triangle_size*1.2), class_ ='red'))
dwg.add(dwg.use(symbol_without_fill, insert=(400, 400), size=(triangle_size*0.5, triangle_size*0.5), class_ ='blue'))
# Give the name of the example and a title.
y = font_size + 5
dwg.add(dwg.text(title1, insert=(0, y), class_='text', font_size=font_size))
dwg.save()
if __name__ == '__main__':
create_svg(PROGNAME + '.svg')
# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 textwidth=99
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