Draw Control Handles

Draws a separate path which follows the control handles of the selected path. This would probably be more useful with markers if it drew a separate path for each handle.

#!/usr/bin/env python 
import inkex

class Handles(inkex.Effect):
	def effect(self):
		for id, node in self.selected.iteritems():
			if node.tagName == 'path':
				p = inkex.parsePath(node.attributes.getNamedItem('d').value)
				a =[]
				pen = None
				subPathStart = None
				for cmd,params in p:
					if cmd == 'C':
						a.extend([['M', params[:2]], ['L', pen],
							['M', params[2:4]], ['L', params[-2:]]])
					if cmd == 'Q':
						a.extend([['M', params[:2]], ['L', pen],
							['M', params[:2]], ['L', params[-2:]]])
					
					if cmd == 'M':
						subPathStart = params

					if cmd == 'Z':
						pen = subPathStart
					else:
						pen = params[-2:]
					
				if len(a) > 0:
					new = self.document.createElement('svg:path')
					s = {'stroke-linejoin': 'miter', 'stroke-width': '1.0px', 
						'stroke-opacity': '1.0', 'fill-opacity': '1.0', 
						'stroke': '#000000', 'stroke-linecap': 'butt', 
						'fill': 'none'}
					new.setAttribute('style', inkex.formatStyle(s))
					new.setAttribute('d', inkex.formatPath(a))
					node.parentNode.appendChild(new)

e = Handles()
e.affect()

Files:

• handles.py
• handles.inx
• inkex.py