Fix issue #136

extensions/fablabchemnitz/chain_paths/chain_paths.inx

@@ -12,6 +12,7 @@
     </param>
     <param name="snap_ends" type="bool" gui-text="Snap connecting ends together" gui-description="This will deduplicate (merge) two nodes to one node">false</param>
     <param name="close_loops" type="bool" gui-text="Close loops (start/end of the same path)">true</param>
+    <param name="limit" type="int" min="0" max="99999" gui-text="Maximum items to process" gui-description="The more items at once are selected, the slower the process gets. Repeating in smaller steps is better. Set 0 for umlimited selection, else the selection gets cut off.">2000</param>
     <param name="debug" type="bool" gui-text="Debug output">false</param>
     <!-- Keep in sync with chain_paths.py line 19 __version__ = ... -->
     <label appearance="url">https://github.com/fablabnbg/inkscape-chain-paths</label>

extensions/fablabchemnitz/chain_paths/chain_paths.py

@@ -53,6 +53,7 @@ class ChainPaths(inkex.EffectExtension):
 		self.arg_parser.add_argument('-V', '--version', type=inkex.Boolean, default=False, help = 'Just print version number ("' + __version__ + '") and exit.')
 		self.arg_parser.add_argument('-s', '--snap_ends', type=inkex.Boolean, default=True, help='snap end-points together when connecting')
 		self.arg_parser.add_argument('-c', '--close_loops', type=inkex.Boolean, default=True, help='close loops (start/end of the same path)')
+		self.arg_parser.add_argument('-l', '--limit', type=int, default=2000, help='Maximum items to process')
 		self.arg_parser.add_argument('-u', '--units', default="mm", help="measurement unit for epsilon")
 		self.arg_parser.add_argument('-e', '--chain_epsilon', type=float, default=0.01, help="Max. distance to connect [mm]")
 		self.arg_parser.add_argument('-d', '--debug', type=inkex.Boolean, default=False, help='Debug')
@@ -84,7 +85,7 @@ class ChainPaths(inkex.EffectExtension):
 		if not id in self.segments_done:
 			self.segments_done[id] = {}
 		self.segments_done[id][n] = True
-    if so.debug: inkex.utils.debug("done {} {} {}".format(id), n, msg)
+		if so.debug: inkex.utils.debug("done {} {} {}".format(id, n, msg))
 
 	def is_segment_done(self, id, n):
 		if not id in self.segments_done:
@@ -139,12 +140,20 @@ class ChainPaths(inkex.EffectExtension):
 		if self.chain_epsilon < 0.001: self.chain_epsilon = 0.001        # keep a minimum.
 		self.eps_sq = self.chain_epsilon * self.unit_factor * self.chain_epsilon * self.unit_factor
 
-    if not len(self.svg.selected.items()):
+		selected = self.svg.selected.items()
+
+		itemsCount = len(selected)
+		if not itemsCount:
 			inkex.errormsg("Please select one or more objects.")
 			return
 
+		#selected = dict(reversed(list(selected))) #reverse
+		if so.limit > 0 and itemsCount > so.limit:
+			inkex.utils.debug("Maximum items to process is set to {}. You selected {} items. We continue with processing until limit is reached.".format(so.limit, itemsCount))
+
 		segments = []
-    for id, node in self.svg.selected.items():
+		workedon = 0
+		for id, node in selected:
 			if node.tag != inkex.addNS('path', 'svg'):
 				inkex.errormsg("Object id {} is not a path. Try\n  - Path->Object to Path\n  - Object->Ungroup".format(node.get('id')))
 				return
@@ -171,6 +180,10 @@ class ChainPaths(inkex.EffectExtension):
 				segments.append({'id': id, 'n': sub_idx, 'end1': end1, 'end2':end2, 'seg': sub})
 			if node.get(inkex.addNS('type', 'sodipodi')):
 				del node.attrib[inkex.addNS('type', 'sodipodi')]
+			workedon += 1
+			if workedon >= so.limit and so.limit > 0:
+					break
+
 		if so.debug: inkex.utils.debug("-------- seen: ")
 		for s in segments:
 			if so.debug: inkex.utils.debug("{}, {}, {}, {}".format(s['id'], s['n'], s['end1'], s['end2']))
@@ -178,7 +191,9 @@ class ChainPaths(inkex.EffectExtension):
 		# chain the segments
 		obsoleted = 0
 		remaining = 0
-    for id, node in self.svg.selected.items():
+
+		workedon = 0
+		for id, node in selected:
 			path_d = CubicSuperPath(Path(node.get('d')))
 			# ATTENTION: for parsePath() it is the same, if first and last point coincide, or if the path is really closed.
 			path_closed = True if re.search(r'z\s*$', node.get('d')) else False
@@ -272,6 +287,9 @@ class ChainPaths(inkex.EffectExtension):
 				if path_closed: p_fmt += " z"
 				if so.debug: inkex.utils.debug("new path: {}".format(p_fmt))
 				node.set('d', p_fmt)
+			workedon += 1
+			if workedon >= so.limit and so.limit > 0:
+					 break
 
 		# statistics:
 		if so.debug: inkex.utils.debug("Path nodes obsoleted: {}\nPath nodes remaining: {}".format(obsoleted, remaining))