spirograph

(bzr r2641)

3 files changed, 141 insertions, 0 deletions

diff --git a/share/extensions/Makefile.am b/share/extensions/Makefile.am
index f50465570..256133d03 100644
--- a/share/extensions/Makefile.am
+++ b/share/extensions/Makefile.am
@@ -72,6 +72,8 @@ extensions = \
 	simplestyle.py \
 	sk2svg.sh \
 	SpSVG.pm \
+	spirograph.py\
+	spirograph.inx\
 	straightseg.py \
 	summersnight.py \
 	svg_and_media_zip_output.py \
diff --git a/share/extensions/spirograph.inx b/share/extensions/spirograph.inx
new file mode 100644
index 000000000..63ffa7c12
--- /dev/null
+++ b/share/extensions/spirograph.inx
@@ -0,0 +1,24 @@
+<inkscape-extension>
+    <_name>Spirograph</_name>
+    <id>org.ekips.filter.spirograph</id>
+	<dependency type="executable" location="extensions">spirograph.py</dependency>
+	<dependency type="executable" location="extensions">inkex.py</dependency>
+	<param name="primaryr" type="float" min="0.0" max="1000.0" _gui-text="R - Ring Radius (px)">100.0</param>
+	<param name="secondaryr" type="float" min="0.0" max="1000.0" _gui-text="r - Gear Radius (px)">60.0</param>
+	<param name="penr" type="float" min="0.0" max="1000.0" _gui-text="d - Pen Radius (px)">50.0</param>
+    <param name="gearplacement" type="optiongroup" _gui-text="Gear Placement">
+        <option>Inside (Hypotrochoid)</option>
+        <option>Outside (Epitrochoid)</option>
+    </param>
+    <param name="rotation" type="float" min="-360.0" max="360.0" _gui-text="Rotation (deg)">0.0</param>
+    <param name="quality" type="int" min="1" max="100" _gui-text="Quality (Default = 16)">16</param>
+	<effect>
+		<object-type>all</object-type>
+                <effects-menu>
+                    <submenu _name="Render"/>
+                </effects-menu>						    		
+    </effect>
+    <script>
+        <command reldir="extensions" interpreter="python">spirograph.py</command>
+    </script>
+</inkscape-extension>
diff --git a/share/extensions/spirograph.py b/share/extensions/spirograph.py
new file mode 100644
index 000000000..19b7ab870
--- /dev/null
+++ b/share/extensions/spirograph.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python 
+'''
+Copyright (C) 2007 Joel Holdsworth joel@airwebreathe.org.uk
+
+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, math
+
+class Spirograph(inkex.Effect):
+    def __init__(self):
+        inkex.Effect.__init__(self)
+        self.OptionParser.add_option("-R", "--primaryr",
+                        action="store", type="float", 
+                        dest="primaryr", default=60.0,
+                        help="The radius of the outer gear")
+        self.OptionParser.add_option("-r", "--secondaryr",
+                        action="store", type="float", 
+                        dest="secondaryr", default=100.0,
+                        help="The radius of the inner gear")
+        self.OptionParser.add_option("-d", "--penr",
+                        action="store", type="float", 
+                        dest="penr", default=50.0,
+                        help="The distance of the pen from the inner gear")
+        self.OptionParser.add_option("-p", "--gearplacement",
+                        action="store", type="string", 
+                        dest="gearplacement", default=50.0,
+                        help="Selects whether the gear is inside or outside the ring")
+        self.OptionParser.add_option("-a", "--rotation",
+                        action="store", type="float", 
+                        dest="rotation", default=100.0,
+                        help="The number of degrees to rotate the image by")                        
+        self.OptionParser.add_option("-q", "--quality",
+                        action="store", type="int", 
+                        dest="quality", default=16,
+                        help="The quality of the calculated output")                       
+    def effect(self):
+    
+        if self.options.secondaryr == 0:
+            return
+        if self.options.quality == 0:
+            return
+
+        if(self.options.gearplacement.strip(' ').lower().startswith('outside')):
+            a = self.options.primaryr + self.options.secondaryr
+            flip = -1
+        else:
+            a = self.options.primaryr - self.options.secondaryr
+            flip = 1
+        
+        ratio = a / self.options.secondaryr
+        if ratio == 0:
+            return
+        scale = 2 * math.pi / (ratio * self.options.quality)
+        
+        rotation = 2 * math.pi * self.options.rotation / 180;
+        
+        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', simplestyle.formatStyle(s))
+        
+        pathString = ''
+        maxPointCount = 1000
+        
+        for i in range(maxPointCount):
+
+            theta = i * scale
+           
+            x = a * math.cos(theta + rotation) + \
+                self.options.penr * math.cos(ratio * theta + rotation) * flip + \
+                self.view_center[0]
+            y = a * math.sin(theta + rotation) - \
+                self.options.penr * math.sin(ratio * theta + rotation) + \
+                self.view_center[1]
+                
+            dx = (-a * math.sin(theta + rotation) - \
+                ratio * self.options.penr * math.sin(ratio * theta + rotation) * flip) * scale / 3
+            dy = (a * math.cos(theta + rotation) - \
+                ratio * self.options.penr * math.cos(ratio * theta + rotation)) * scale / 3
+            
+            if i <= 0:
+                pathString += 'M ' + str(x) + ',' + str(y) + ' C ' + str(x + dx) + ',' + str(y + dy) + ' '
+            else:
+                pathString += str(x - dx) + ',' + str(y - dy) + ' ' + str(x) + ',' + str(y)
+                    
+                if math.fmod(i / ratio, self.options.quality) == 0 and i % self.options.quality == 0:
+                    pathString += 'Z'
+                    break
+                else:
+                    if i == maxPointCount - 1:
+                        pass # we reached the allowed maximum of points, stop here
+                    else:
+                        pathString += ' C ' + str(x + dx) + ',' + str(y + dy) + ' '
+                    
+        
+        new.setAttribute('d', pathString)
+        self.current_layer.appendChild(new)
+
+e = Spirograph()
+e.affect()
+