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#!/usr/bin/env python3
#coding:utf-8
# Author: mozman
# Purpose: svg examples
# Created: 08.09.2010
# Copyright (C) 2010, Manfred Moitzi
# License: MIT License
try:
import svgwrite
except ImportError:
# if svgwrite is not 'installed' append parent dir of __file__ to sys.path
import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
import svgwrite
def marker(name):
# Shows how to use the <marker> element.
# W3C reference: http://www.w3.org/TR/SVG11/painting.html#MarkerElement
#
dwg = svgwrite.Drawing(name, size=('20cm', '15cm'), profile='full', debug=True)
# set user coordinate space
dwg.viewbox(width=200, height=150)
#--start-- A red point as marker-start element
# 'insert' represents the insertation point in user coordinate space
# in this example its the midpoint of the circle, see below
marker_start = dwg.marker(insert=(0, 0), size=(5, 5)) # target size of the marker
# setting a user coordinate space for the appanded graphic elements
# bounding coordinates for this example:
# minx = -5, maxx = +5, miny = -5, maxy = +5
marker_start.viewbox(minx=-5, miny=-5, width=10, height=10) # the marker user coordinate space
marker_start.add(dwg.circle((0, 0), r=5)).fill('red', opacity=0.5)
#--end-- A blue point as marker-end element
# a shorter form of the code above:
marker_end = dwg.marker(size=(5, 5)) # marker defaults: insert=(0,0)
# set viewbox to the bounding coordinates of the circle
marker_end.viewbox(-1, -1, 2, 2)
marker_end.add(dwg.circle(fill='blue', fill_opacity=0.5)) # circle defaults: insert=(0,0), r=1
#--mid-- A green point as marker-mid element
# if you don't setup a user coordinate space, the default ucs is
# minx = 0, miny = 0, maxx=size[0], maxy=size[1]
# default size = (3, 3) defined by the SVG standard
# bounding coordinates for this example:
# minx = 0, maxx = 6, miny = 0, maxy = 6
# => center of the viewbox = (3, 3)!
marker_mid = dwg.marker(insert=(3, 3), size=(6, 6))
marker_mid.add(dwg.circle((3, 3), r=3)).fill('green', opacity=0.7)
# The drawing size of the 'start-marker' is greater than the drawing size of
# the 'marker-mid' (r=5 > r=3), but the resulting size is defined by the
# 'size' parameter of the marker object (size=(6,6) > size=(5,5)), so the
# 'marker-start' is smaller than the 'marker-mid'.
# add marker to defs section of the drawing
dwg.defs.add(marker_start)
dwg.defs.add(marker_mid)
dwg.defs.add(marker_end)
# create a new line object, fill='none' is important, because by default
# the polyline and the polygon object is filled (tested with FF, Chrome).
# I am not sure, if this is concurring to the SVG Standard.
line = dwg.add(dwg.polyline(
[(10, 10), (50, 20), (70, 50), (100, 30), (120, 140), (170, 100)],
stroke='black', fill='none'))
# set markers 3-tuple = ('marker-start', 'marker-mid', 'marker-end')
line.set_markers( (marker_start, marker_mid, marker_end) )
# or set markers direct as SVG Attributes 'marker-start', 'marker-mid',
# 'marker-end' or 'marker' if all markers are the same.
# line['marker'] = marker.get_funciri() # but 'marker' works only with Firefox (26.10.2010)
dwg.save()
if __name__ == '__main__':
marker("marker.svg")
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