extensions. function plotter. patch by ~suv for clip rectangle (Bug 492103)

Fixed bugs:
  - https://launchpad.net/bugs/492103

(bzr r11977)

2 files changed, 16 insertions, 0 deletions

diff --git a/share/extensions/funcplot.inx b/share/extensions/funcplot.inx
index 8eaf33f01..58cf158ca 100644
--- a/share/extensions/funcplot.inx
+++ b/share/extensions/funcplot.inx
@@ -41,6 +41,7 @@ The constants pi and e are also available.</_param>
 	<param name="fofx" type="string" _gui-text="Function:">exp(-x*x)</param>
 	<param name="fponum" type="boolean" _gui-text="Calculate first derivative numerically">true</param>
 	<param name="fpofx" type="string" _gui-text="First derivative:">x</param>
+	<param name="clip" type="boolean" _gui-text="Clip with rectangle">false</param>
 	<param name="remove" type="boolean" _gui-text="Remove rectangle">true</param>
 	<param name="drawaxis" type="boolean" _gui-text="Draw Axes">false</param>
 	<param name="endpts" type="boolean" _gui-text="Add x-axis endpoints">false</param>
diff --git a/share/extensions/funcplot.py b/share/extensions/funcplot.py
index 08ac15dbb..7f8fdafe1 100755
--- a/share/extensions/funcplot.py
+++ b/share/extensions/funcplot.py
@@ -28,6 +28,7 @@ Changes:
 # standard library
 from math import *
 from random import *
+from copy import deepcopy
 # local library
 import inkex
 import simplepath
@@ -217,6 +218,10 @@ class FuncPlot(inkex.Effect):
                         action="store", type="string", 
                         dest="fpofx", default="cos(x)",
                         help="f'(x) for plotting") 
+        self.OptionParser.add_option("--clip",
+                        action="store", type="inkbool",
+                        dest="clip", default=False,
+                        help="If True, clip with copy of source rectangle")
         self.OptionParser.add_option("--remove",
                         action="store", type="inkbool", 
                         dest="remove", default=True,
@@ -293,6 +298,16 @@ class FuncPlot(inkex.Effect):
                                 
                 # add path into SVG structure
                 node.getparent().append(newpath)
+                # option whether to clip the path with rect or not.
+                if self.options.clip:
+                    defs = self.xpathSingle('/svg:svg//svg:defs')
+                    if defs == None:
+                        defs = inkex.etree.SubElement(self.document.getroot(),inkex.addNS('defs','svg'))
+                    clip = inkex.etree.SubElement(defs,inkex.addNS('clipPath','svg'))
+                    clip.append(deepcopy(node))
+                    clipId = self.uniqueId('clipPath')
+                    clip.set('id', clipId)
+                    newpath.set('clip-path', 'url(#'+clipId+')')
                 # option wether to remove the rectangle or not.
                 if self.options.remove:
                     node.getparent().remove(node)