+ add Epitrochoid example

git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5154 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d

src/Mod/PartDesign/App/CMakeLists.txt

@@ -82,6 +82,7 @@ SET(PartDesign_Scripts
     Scripts/__init__.py
     Scripts/Gear.py
     Scripts/DistanceBolt.py
+    Scripts/Epitrochoid.py
     Scripts/RadialCopy.py
     Scripts/Parallelepiped.py
     Scripts/Spring.py

src/Mod/PartDesign/Scripts/Epitrochoid.py

@@ -0,0 +1,65 @@
+
+from __future__ import division # allows floating point division from integers
+import FreeCAD, Part, math
+from FreeCAD import Base
+
+class Epitrochoid:
+    def __init__(self, obj):
+        ''' Add the properties: Radius1, Radius2, Distance, Segments '''
+        obj.addProperty("App::PropertyLength","Radius1","Epitrochoid","Interior radius").Radius1=60.0
+        obj.addProperty("App::PropertyLength","Radius2","Epitrochoid","Exterior radius").Radius2=20.0
+        obj.addProperty("App::PropertyLength","Distance","Epitrochoid","Distance").Distance=10.0
+        obj.addProperty("App::PropertyInteger","Segments","Epitrochoid","Number of the line segments").Segments=72
+        obj.Proxy = self
+
+    def onChanged(self, fp, prop):
+        if prop == "Radius1" or prop == "Radius2" or prop == "Distance" or prop == "Segments": #if one of these is changed
+            self.execute(fp)
+
+    def execute(self, fp): #main part of script
+        steps=fp.Segments  #get value from property
+        dang=math.radians(360/steps)
+        r2=fp.Radius2
+        r1=fp.Radius1
+        f1 = r1 + r2
+        f2 = f1 / r2
+        d=fp.Distance
+        ang=0
+        z=0
+        
+        if r2 == 0:
+            raise Exception("Exterior radius must not be zero")
+
+        for i in range(steps):
+            if i==0:
+                x1=f1*math.cos(ang)-d*math.cos(f2*ang) #coords for line startpoint
+                y1=f1*math.sin(ang)-d*math.sin(f2*ang)
+                ang=dang
+                x2=f1*math.cos(ang)-d*math.cos(f2*ang) #coords for line endpoint
+                y2=f1*math.sin(ang)-d*math.sin(f2*ang)
+                seg=Part.makeLine((x1,y1,z),(x2,y2,z))
+                wire=Part.Wire([seg])
+                x1=x2
+                y1=y2
+            else:
+                x2=f1*math.cos(ang)-d*math.cos(f2*ang)
+                y2=f1*math.sin(ang)-d*math.sin(f2*ang)
+                seg=Part.makeLine((x1,y1,z),(x2,y2,z))
+                wire=Part.Wire([wire,seg])
+                x1=x2
+                y1=y2
+            ang=ang+dang #increment angle
+        fp.Shape = wire  #result shape
+
+def makeEpitrochoid():
+    doc = FreeCAD.activeDocument()
+    if doc == None:
+        doc = FreeCAD.newDocument()
+    epitrochoid=doc.addObject("Part::FeaturePython","Epitrochoid") #add object to document
+    epitrochoid.Label = "Epitrochoid"
+    Epitrochoid(epitrochoid)
+    epitrochoid.ViewObject.Proxy=0
+    doc.recompute()
+
+if __name__ == "__main__": #feature will be generated after macro execution
+    makeEpitrochoid()

src/Mod/PartDesign/Scripts/Makefile.am

@@ -4,6 +4,7 @@ data_DATA = \
 		__init__.py \
 		Gear.py \
 		DistanceBolt.py \
+		Epitrochoid.py \
 		RadialCopy.py \
 		Parallelepiped.py \
 		Spring.py