Added measure extension.

(bzr r537)

3 files changed, 124 insertions, 0 deletions

diff --git a/share/extensions/Makefile.am b/share/extensions/Makefile.am
index a75af5583..0fe2b6cd1 100644
--- a/share/extensions/Makefile.am
+++ b/share/extensions/Makefile.am
@@ -49,6 +49,7 @@ extensions = \
 	fig2svg.sh \
     cspsubdiv.py \
     flatten.py \
+    measure.py \
     gimp_xcf.py
 
 otherstuff =
@@ -93,6 +94,7 @@ modules = \
 	dxf_outlines.inx \
     fig_input.inx \
     flatten.inx \
+    measure.inx \
     gimp_xcf.inx
 
 extension_SCRIPTS = \
diff --git a/share/extensions/measure.inx b/share/extensions/measure.inx
new file mode 100644
index 000000000..820ba8fa7
--- /dev/null
+++ b/share/extensions/measure.inx
@@ -0,0 +1,16 @@
+<inkscape-extension>
+    <_name>Measure paths</_name>
+    <id>com.njhurst.filter.measure_length</id>
+	<dependency type="executable" location="extensions">measure.py</dependency>
+	<dependency type="executable" location="extensions">inkex.py</dependency>
+	<param name="fontsize" type="string" _gui-text="Font size">20</param>
+    <effect>
+		<object-type>path</object-type>
+                <effects-menu>
+                    <submenu _name="Visualize Path"/>
+                </effects-menu>
+    </effect>
+    <script>
+        <command reldir="extensions" interpreter="python">measure.py</command>
+    </script>
+</inkscape-extension>
diff --git a/share/extensions/measure.py b/share/extensions/measure.py
new file mode 100644
index 000000000..e8089ca05
--- /dev/null
+++ b/share/extensions/measure.py
@@ -0,0 +1,106 @@
+#!/usr/bin/env python 
+'''
+Copyright (C) 2006 Nathan Hurst
+Copyright (C) 2005 Aaron Spike, aaron@ekips.org
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+'''
+import inkex, simplestyle, simplepath,sys,cubicsuperpath, bezmisc
+
+def numsegs(csp):
+	return sum([len(p)-1 for p in csp])
+def interpcoord(v1,v2,p):
+	return v1+((v2-v1)*p)
+def interppoints(p1,p2,p):
+	return [interpcoord(p1[0],p2[0],p),interpcoord(p1[1],p2[1],p)]
+def pointdistance((x1,y1),(x2,y2)):
+	return math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2))
+def bezlenapprx(sp1, sp2):
+	return pointdistance(sp1[1], sp1[2]) + pointdistance(sp1[2], sp2[0]) + pointdistance(sp2[0], sp2[1])
+def tpoint((x1,y1), (x2,y2), t = 0.5):
+	return [x1+t*(x2-x1),y1+t*(y2-y1)]
+def cspbezsplit(sp1, sp2, t = 0.5):
+	m1=tpoint(sp1[1],sp1[2],t)
+	m2=tpoint(sp1[2],sp2[0],t)
+	m3=tpoint(sp2[0],sp2[1],t)
+	m4=tpoint(m1,m2,t)
+	m5=tpoint(m2,m3,t)
+	m=tpoint(m4,m5,t)
+	return [[sp1[0][:],sp1[1][:],m1], [m4,m,m5], [m3,sp2[1][:],sp2[2][:]]]
+def cspbezsplitatlength(sp1, sp2, l = 0.5, tolerance = 0.001):
+	bez = (sp1[1][:],sp1[2][:],sp2[0][:],sp2[1][:])
+	t = bezmisc.beziertatlength(bez, l, tolerance)
+	return cspbezsplit(sp1, sp2, t)
+def cspseglength(sp1,sp2, tolerance = 0.001):
+	bez = (sp1[1][:],sp1[2][:],sp2[0][:],sp2[1][:])
+	return bezmisc.bezierlength(bez, tolerance)	
+def csplength(csp):
+	total = 0
+	lengths = []
+	for sp in csp:
+		lengths.append([])
+		for i in xrange(1,len(sp)):
+			l = cspseglength(sp[i-1],sp[i])
+			lengths[-1].append(l)
+			total += l			
+	return lengths, total
+
+class Length(inkex.Effect):
+	def __init__(self):
+		inkex.Effect.__init__(self)
+		self.OptionParser.add_option("-f", "--fontsize",
+						action="store", type="string", 
+						dest="fontsize", default="20",
+						help="Size of node label numbers")	
+		self.OptionParser.add_option("-o", "--offset",
+						action="store", type="string", 
+						dest="offset", default="-4",
+						help="The distance above the curve")	
+	def effect(self):
+		for id, node in self.selected.iteritems():
+			if node.tagName == 'path':
+				self.group = self.document.createElement('svg:g')
+				node.parentNode.appendChild(self.group)
+				
+				try:
+					t = node.attributes.getNamedItem('transform').value
+					self.group.setAttribute('transform', t)
+				except AttributeError:
+					pass
+
+				a =[]
+				p = cubicsuperpath.parsePath(node.attributes.getNamedItem('d').value)
+				num = 1
+				slengths, stotal = csplength(p)
+                                self.addTextOnPath(self.group,0, 0,str(stotal), id, self.options.offset)
+
+				
+	def addTextOnPath(self,node,x,y,text, id,dy=0):
+				new = self.document.createElement('svg:text')
+				tp = self.document.createElement('svg:textPath')
+				s = {'font-size': self.options.fontsize, 'fill-opacity': '1.0', 'stroke': 'none',
+					'font-weight': 'normal', 'font-style': 'normal', 'fill': '#000000'}
+				new.setAttribute('style', simplestyle.formatStyle(s))
+				new.setAttribute('x', str(x))
+				new.setAttribute('y', str(y))
+				tp.setAttributeNS('http://www.w3.org/1999/xlink','xlink:href', '#'+id)
+				tp.setAttribute('startOffset', "50%")
+				#tp.setAttribute('dy', dy) # dubious merit
+				new.appendChild(tp)
+                                tp.appendChild(self.document.createTextNode(str(text)))
+				node.appendChild(new)
+
+e = Length()
+e.affect()