out.svg

<?xml version="1.0" encoding="utf-8" ?>
<svg baseProfile="tiny" height="10cm" version="1.2" viewBox="0,0,10,10" width="10cm" xmlns="http://www.w3.org/2000/svg" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <linearGradient id="color_dark">
      <stop stop-color="black"/>
    </linearGradient>
    <linearGradient id="color_light">
      <stop stop-color="rgb(255,240,190)"/>
    </linearGradient>
  </defs>
  <rect fill="url(#color_light)" height="10cm" width="10cm" x="0" y="0"/>
  <g id="dark_area">
    <circle cx="50%" cy="50%" fill="url(#color_dark)" r="1.5"/>
  </g>
  <g id="circles" stroke-width="0.0125">
    <g id="circles_light">
      <circle cx="50%" cy="50%" fill="url(#color_light)" r="0.0225"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="0.25" stroke="url(#color_light)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="0.5" stroke="url(#color_light)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="0.75" stroke="url(#color_light)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="1.0" stroke="url(#color_light)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="1.25" stroke="url(#color_light)"/>
    </g>
    <g id="circles_dark">
      <circle cx="50%" cy="50%" fill-opacity="0" r="1.5" stroke="url(#color_dark)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="1.75" stroke="url(#color_dark)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="2.0" stroke="url(#color_dark)"/>
      <circle cx="50%" cy="50%" fill-opacity="0" r="2.25" stroke="url(#color_dark)"/>
    </g>
  </g>
</svg>

vectar.py

#!/usr/bin/env python3
'''TODO: Analyze a shooting range target and export a vector (SVG) image out of it.'''
import svgwrite
from svgwrite import cm


def create_target(filename, size):
    '''Generate a SVG target and saves it to a file.'''

    # Constants
    color_dark = 'black'
    mid = ('50%', '50%')
    #radius_list = [0.25, 0.50, 0.75, 1.00, 1.25, 1.75, 2.00, 2.25]

    # Setup `svgwrite`
    tgt = svgwrite.Drawing(filename=filename, size=size, profile='tiny')
    tgt.viewbox(width=10, height=10)

    # Defs
    color_dark = tgt.linearGradient(id='color_dark')
    color_light = tgt.linearGradient(id='color_light')

    color_dark.add_stop_color(color='black')
    color_light.add_stop_color(color='rgb(255,240,190)')

    tgt.defs.add(color_dark)
    tgt.defs.add(color_light)

    # Groups
    background = tgt.rect(size=size, fill='url(#color_light)')
    circles = tgt.g(id='circles', stroke_width='0.0125')
    circles_dark = tgt.g(id='circles_dark')
    circles_light = tgt.g(id='circles_light')
    dark_area = tgt.g(id='dark_area')

    # Output elements
    tgt.add(background)
    tgt.add(dark_area)
    tgt.add(circles)
    circles.add(circles_light)
    circles.add(circles_dark)

    # Dark area
    dark_area.add(tgt.circle(center=mid, r=1.5, fill='url(#color_dark)'))

    # Inside dark area: innermost light circle
    circles_light.add(tgt.circle(
        center=mid, r=0.0225, fill='url(#color_light)'))

    # Inside dark area: all light circles
    for cm_increments in enumerate([0.25, 0.50, 0.75, 1.00, 1.25]):
        circles_light.add(tgt.circle(center=mid,
                                     r=cm_increments[1],
                                     fill_opacity=0,
                                     stroke='url(#color_light)'))

    # Outside dark area: innermost dark circle
    circles_dark.add(tgt.circle(center=mid,
                                r=1.50,
                                fill_opacity=0,
                                stroke='url(#color_dark)'))

    # Outside dark area: all dark circles
    for cm_increments in enumerate([1.75, 2.00, 2.25]):
        circles_dark.add(tgt.circle(center=mid,
                                    r=cm_increments[1],
                                    fill_opacity=0,
                                    stroke='url(#color_dark)'))

    tgt.save(pretty=True)

if __name__ == '__main__':
    create_target('out.svg', (10 * cm, 10 * cm))