219 lines
11 KiB
Python
219 lines
11 KiB
Python
#!/usr/bin/env python3
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'''
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This extension changes the order of the nodes without changing the shape of the path. It's required to modify paths
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like this for example when projecting text to path or applying bezier envelope transformation.
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Author: Mario Voigt / FabLab Chemnitz
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Mail: mario.voigt@stadtfabrikanten.org
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Date: 19.05.2021
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Last patch: 28.05.2025
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License: GNU GPL v3
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'''
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import copy
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import inkex
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import sys
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from inkex import Circle, TextElement, PathElement
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from inkex.paths import CubicSuperPath, Path
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class MovePathNode(inkex.EffectExtension):
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def modify(self, element):
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if self.options.debug is True:
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inkex.utils.debug("raw root path:")
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inkex.utils.debug(element.path)
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inkex.utils.debug("-"*25)
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raw = element.path.to_arrays()
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subpaths, prev = [], 0
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for i in range(len(raw)): # Breaks compound paths into simple paths
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if raw[i][0] == 'M' and i != 0:
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subpaths.append(raw[prev:i])
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prev = i
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subpaths.append(raw[prev:])
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if self.options.debug is True:
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if len(subpaths) == 0:
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inkex.utils.debug("{} has no subpaths").format(element.get('id'))
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else:
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inkex.utils.debug("{} has {} subpath(s)".format(element.get('id'), len(subpaths)))
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subpathNr = 0
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for path in subpaths:
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subpathNr += 1
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newSubpaths = subpaths #we will overwrite them later
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pathIsClosed = False
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if path[-1][0] == 'Z' or \
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(path[-1][0] == 'L' and path[0][1] == path[-1][1]) or \
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(path[-1][0] == 'C' and path[0][1] == [path[-1][1][-2], path[-1][1][-1]]) \
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: #if first is last point the path is also kind of closed, but not cleanly. We assume that matching of start and end targets to be closed
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pathIsClosed = True
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if self.options.debug is True:
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nodeCountInitial = len(path)
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inkex.utils.debug("pathIsClosed = " + str(pathIsClosed))
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inkex.utils.debug("initial nodes = " + str(nodeCountInitial))
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if self.options.closed_only is True and pathIsClosed is False:
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if len(subpaths) == 0:
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inkex.utils.debug("{}/subpath {} is not closed! Skipping ...".format(element.get('id'), subpathNr))
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else:
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inkex.utils.debug("{} is not closed! Skipping ...".format(element.get('id')))
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continue #skip this open path
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if len(path) == 2:
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continue #skip this open path (special case of straight line segment)
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if path[-1][0] == 'Z': #replace Z with another L command (which moves to the coordinates of the first M command in path) to have better overview
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path[-1][0] = 'L'
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path[-1][1] = path[0][1]
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#adjust if entered move number is higher than actual node count. We handle as infinite looping
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moves = (self.options.movenode) % len(path)
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if pathIsClosed is True: #if closed start and end collapse and "duplicate"
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moves = (self.options.movenode) % (len(path) - 1)
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if self.options.movenode == 0: #special handling for 0 is required - means "do nothing"
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moves = 0
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if moves < 1:
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if self.options.debug is True: inkex.utils.debug("Nothing to do (0 moves) ...")
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else:
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if self.options.debug is True:
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inkex.utils.debug("moves to perform = " + str(moves))
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inkex.utils.debug("raw root path:")
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inkex.utils.debug(path)
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inkex.utils.debug("-"*25)
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for i in range(moves):
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if len(path) > 2: #the path needs at least more than two segments, else we might just get a "pointy path" on an open path
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#special case for rare paths: check if first node and last node match and if there is a Z between, which doubles up, while showing 1 node less than exspected
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doubleClosed = False
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if [path[0][1][-2], path[0][1][-1]] == [path[-2][1][-2], path[-2][1][-1]] and pathIsClosed is True:
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doubleClosed = True
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if self.options.debug is True: inkex.utils.debug("doubleClosed = " + str(doubleClosed))
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#we move the first segment to the end of the list
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move = path[0]
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del path[0]
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path.append(move)
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oldseg = copy.deepcopy(path[0]) #if we assign like "oldseg = path[0]", it will get overwritten. So we need copy
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if self.options.debug is True:
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inkex.utils.debug("moved path (move no. {}):".format(i+1))
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inkex.utils.debug(path)
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inkex.utils.debug("-"*25)
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#Now we messed the integrity of the path. It does not begin with 'M' now. But we need an 'M'.
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#It now either starts with L or C. H, V, Z cannot occure here.
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if path[0][0] == 'C': #and path[-1][0] == 'M':
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#inkex.utils.debug("C to M")
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path[0][1] = [path[0][1][-2], path[0][1][-1]]
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elif path[0][0] == 'L': #and path[-1][0] == 'M':
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#inkex.utils.debug("L to M")
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path[0][1] = [path[0][1][0], path[0][1][1]]
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#else:
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# inkex.utils.debug("no idea")
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path[0][0] = 'M' #we really need M. Does not matter if 'L' or 'C'.
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if doubleClosed is True:
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del path[-2]
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if pathIsClosed is True:
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if path[-1][0] == 'M' and len(oldseg[1]) == 2: #data of an 'L' command
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path[-1][0] = 'L'
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path[-1][1] = path[0][1]
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if self.options.debug is True: inkex.utils.debug("modified M command to L command")
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elif path[-1][0] == 'M' and len(oldseg[1]) > 2: #data of an 'C' command
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path[-1][0] = 'C'
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path[-1][1] = oldseg[1]
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if self.options.debug is True: inkex.utils.debug("modified M command to C command")
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else:
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if path[-1][0] == 'M': #if open path we just drop the dangling 'M' command completely
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del path[-1]
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if self.options.debug is True: inkex.utils.debug("delete dangling M command")
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if pathIsClosed is True and path[-1] != (['Z', []]):
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path.append(['Z', []])
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if self.options.debug is True:
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nodeCountFinal = len(path)
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inkex.utils.debug("final nodes = " + str(nodeCountFinal)) #that count must match the inital count!
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inkex.utils.debug("final path:")
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inkex.utils.debug(path)
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inkex.utils.debug("-"*25)
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if nodeCountInitial != nodeCountFinal:
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inkex.utils.debug("Warning! Node count changed from {} to {}".format(nodeCountInitial, nodeCountFinal))
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newSubpaths[subpathNr - 1] = path
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else:
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if self.options.debug is True:
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inkex.utils.debug("More moves entered than possible to apply. Path result would be a point, not a line")
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#return
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composedPath = inkex.Path()
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for newSubpath in newSubpaths:
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composedPath.extend(newSubpath)
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if self.options.debug is True:
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inkex.utils.debug("Composed path = " + str(composedPath))
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element.path = composedPath
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def visualizeFirstTwo(self, element):
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"""Add a dot label for this path element"""
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group = element.getparent().add(inkex.Group(id="visualize-group-" + element.get('id')))
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dot_group = group.add(inkex.Group(id="dot-group-" + element.get('id')))
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num_group = group.add(inkex.Group(id="num-group-" + element.get('id')))
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group.transform = element.transform
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radius = self.svg.unittouu(self.options.dotsize) / 2
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count = 0
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for step, (x, y) in enumerate(element.path.end_points):
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count += 1
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circle = Circle(cx=str(x), cy=str(y), r=str(radius), id="circle-" + element.get('id') + "-" + str(count))
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circle.style = inkex.Style({'stroke': 'none', 'fill': '#000'})
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text = TextElement(x=str(x + radius), y=str(y - radius), id="text-" + element.get('id') + "-" + str(count))
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text.text = str(count) #we start with #1
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text.style = inkex.Style({'font-size': self.svg.unittouu(self.options.fontsize), 'fill-opacity': '1.0', 'stroke': 'none',
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'font-weight': 'normal', 'font-style': 'normal', 'fill': '#999'})
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dot_group.append(circle)
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num_group.append(text)
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if count > 1: #we only display first two points to see the position of the first node and the path direction
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break
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def add_arguments(self, pars):
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pars.add_argument("--tab")
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pars.add_argument("--closed_only", type=inkex.Boolean, default=False, help="If disabled we also apply on open (sub)path. Warning: This REMOVES segments!")
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pars.add_argument("--movenode", type=int, default=0, help="Move starting node n nodes further")
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pars.add_argument('--visualize_result', type=inkex.Boolean, default=False, help="If enabled each node gets a number and a dot")
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pars.add_argument("--dotsize", default="10px", help="Size of the dots on the path nodes")
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pars.add_argument("--fontsize", default="20px", help="Size of node labels")
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pars.add_argument("--debug", type=inkex.Boolean, default=False, help="Debug Output")
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def effect(self):
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if len(self.svg.selected) > 0:
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elements = self.svg.selection.filter(PathElement).values()
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if len(elements) > 0:
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for element in elements:
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#move starting element / change direction
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self.modify(element)
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#finally apply dots to visualize the result
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if self.options.visualize_result is True:
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self.visualizeFirstTwo(element)
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else:
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inkex.errormsg('Selection seems not to contain path elements. Maybe you have selected a group instead?')
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return
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else:
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inkex.errormsg('Please select some objects first.')
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return
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if __name__ == '__main__':
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MovePathNode().run() |