mightyscape-1.1-deprecated/extensions/fablabchemnitz_vh_to_line.py

#!/usr/bin/env python3

#M 60.403,71.0937 V 89.268022 135.773

"""
Extension for InkScape 1.X

This extension converts an SVG path's d attribute the following way: find each V (vertical line) and each H (horizontal line) and replace it by a generic line (L type). 
A lot of extensions do not work with V and H, but with L commands. So this is just a helper extension for other extensions :-)

Example conversion:
from: M 60.403,71.0937 V 89.268022 135.773
to:   M 60.403 71.0937 L 60.403 89.268 L 60.403 135.773

Author: Mario Voigt / FabLab Chemnitz
Mail: mario.voigt@stadtfabrikanten.org
Date: 23.08.2020
Last patch: 23.08.2020
License: GNU GPL v3
"""

from math import *
import inkex
from inkex.paths import Path, CubicSuperPath

class VHToLine(inkex.Effect):
    def __init__(self):
        inkex.Effect.__init__(self)

    def effect(self):
        if len(self.svg.selected) == 0: exit("Please select at least one path.")
        for obj in self.svg.selected: # The objects are the paths, which may be compound
            curr = self.svg.selected[obj]
            raw = Path(curr.get("d")).to_arrays()
            subpaths, prev = [], 0
            for i in range(len(raw)): # Breaks compound paths into simple paths
                if raw[i][0] == 'M' and i != 0:
                    subpaths.append(raw[prev:i])
                    prev = i
            subpaths.append(raw[prev:])
			
            seg = []
            for simpath in subpaths:
                if simpath[-1][0] == 'Z':
                    simpath[-1][0] = 'L'
                    if simpath[-2][0] == 'L': simpath[-1][1] = simpath[0][1]
                    else: simpath.pop()
                for i in range(len(simpath)):
                    if simpath[i][0] == 'V': # vertical and horizontal lines only have one point in args, but 2 are required
                        #inkex.utils.debug(simpath[i][0])
                        simpath[i][0]='L' #overwrite V with regular L command
                        add=simpath[i-1][1][0] #read the X value from previous segment
                        simpath[i][1].append(simpath[i][1][0]) #add the second (missing) argument by taking argument from previous segment
                        simpath[i][1][0]=add #replace with recent X after Y was appended
                    if simpath[i][0] == 'H': # vertical and horizontal lines only have one point in args, but 2 are required
                       #inkex.utils.debug(simpath[i][0])
                        simpath[i][0]='L' #overwrite H with regular L command
                        simpath[i][1].append(simpath[i-1][1][1]) #add the second (missing) argument by taking argument from previous segment				
                    #inkex.utils.debug(simpath[i])
                    seg.append(simpath[i])
            curr.set("d", Path(seg))
			
VHToLine().run()