mightyscape-1.1-deprecated/extensions/fablabchemnitz/drawdirections.py

#!/usr/bin/env python3

import inkex
from inkex.paths import Path
from inkex import Circle

class StartEndPoints(inkex.EffectExtension):

    def drawCircle(self, group, color, point):
        style = inkex.Style({'stroke': 'none', 'fill': color})
        startCircle = group.add(Circle(cx=str(point[0]), cy=str(point[1]), r=str(self.svg.unittouu(str(self.options.dotsize/2) + "px"))))
        startCircle.style = style

    def __init__(self):
        inkex.Effect.__init__(self)
        self.arg_parser.add_argument("--dotsize", type=int, default=10, help="Dot size (px) for self-intersecting points")
   
    def effect(self):
        dot_group = self.svg.add(inkex.Group())
    
        for node in self.svg.get_selected(inkex.PathElement): #works for InkScape (1:1.0+devel+202008292235+eff2292935) @ Linux and for Windows (but with deprecation)
        #for node in self.svg.selection.filter(inkex.PathElement).values(): #works for InkScape 1.1dev (9b1fc87, 2020-08-27)) @ Windows
            points = list(node.path.end_points)
            start = points[0]
            end = points[len(points) - 1]
                    
            if start[0] == end[0] and start[1] == end[1]:
                self.drawCircle(dot_group, '#00FF00', start) 
                self.drawCircle(dot_group, '#FFFF00', points[1]) #draw one point which gives direction of the path
            else: #open contour with start and end point
                self.drawCircle(dot_group, '#FF0000', start)
                self.drawCircle(dot_group, '#0000FF', end)
                  
if __name__ == '__main__':
    StartEndPoints().run()