Draft Bezier Curve: implemented Continuity Property

Draft: allow continuity on closed Bezier curves

Draft: BezCurve bugfixes
    - smoothBezCurve
    - edit mode
    - avoid splitting points into segments as long as degree is zero
    - increase the continuity when closing curve
    - closed berzier curves
    - Catch modifications of continuity of first and last knot on open curves

src/Mod/Draft/Draft.py

@@ -853,6 +853,7 @@ def makeBezCurve(pointslist,closed=False,placement=None,support=None,Degree=None
             Part.BezierCurve().MaxDegree)
     obj.Closed = closed
     obj.Support = support
+    obj.Proxy.resetcontinuity(obj)
     if placement: obj.Placement = placement
     if gui:
         _ViewProviderWire(obj.ViewObject)
@@ -3971,30 +3972,60 @@ class _BezCurve(_DraftObject):
                         "The points of the Bezier curve")
         obj.addProperty("App::PropertyInteger","Degree","Draft",
                         "The degree of the Bezier function")
+        obj.addProperty("App::PropertyIntegerList","Continuity","Draft",
+                        "Continuity")
         obj.addProperty("App::PropertyBool","Closed","Draft",
                         "If the Bezier curve should be closed or not")
         obj.Closed = False
         obj.Degree = 3
+        obj.Continuity = []
+        #obj.setEditorMode("Degree",2)#hide
+        obj.setEditorMode("Continuity",1)#ro
 
     def execute(self, fp):
         self.createGeometry(fp)
-        
+
+    def _segpoleslst(self,fp):
+        """split the points into segments"""
+        if not fp.Closed and len(fp.Points) >= 2: #allow lower degree segement
+            poles=fp.Points[1:]
+        elif fp.Closed and len(fp.Points) >= fp.Degree: #drawable
+            #poles=fp.Points[1:(fp.Degree*(len(fp.Points)//fp.Degree))]+fp.Points[0:1]
+            poles=fp.Points[1:]+fp.Points[0:1]
+        else:
+            poles=[]
+        return [poles[x:x+fp.Degree] for x in \
+            xrange(0, len(poles), (fp.Degree or 1))]
+
+    def resetcontinuity(self,fp):
+        fp.Continuity = [0]*(len(self._segpoleslst(fp))-1+1*fp.Closed)
+        #nump= len(fp.Points)-1+fp.Closed*1
+        #numsegments = (nump // fp.Degree) + 1 * (nump % fp.Degree > 0) -1
+        #fp.Continuity = [0]*numsegments
+
     def onChanged(self, fp, prop):
-        if prop in ["Points","Degree", "Closed"]:
+        if prop == 'Closed': # if remove the last entry when curve gets opened
+            oldlen = len(fp.Continuity)
+            newlen = (len(self._segpoleslst(fp))-1+1*fp.Closed)
+            if oldlen > newlen:
+                fp.Continuity = fp.Continuity[:newlen]
+            if oldlen < newlen:
+                fp.Continuity = fp.Continuity + [0]*(newlen-oldlen)
+        if hasattr(fp,'Closed') and fp.Closed and prop in  ['Points','Degree','Closed'] and\
+                len(fp.Points) % fp.Degree: # the curve editing tools can't handle extra points
+            fp.Points=fp.Points[:(fp.Degree*(len(fp.Points)//fp.Degree))] #for closed curves
+        if prop in ["Degree"] and fp.Degree >= 1: #reset Continuity
+            self.resetcontinuity(fp)
+        if prop in ["Points","Degree","Continuity","Closed"]:
             self.createGeometry(fp)
-                        
+
     def createGeometry(self,fp):
         import Part
         plm = fp.Placement
         if fp.Points:
             startpoint=fp.Points[0]
-            poles=fp.Points[1:]
-            if fp.Closed and (len(fp.Points) > 2):
-                 poles.append(fp.Points[0])
-            segpoleslst=[poles[x:x+fp.Degree] for x in \
-                xrange(0, len(poles), fp.Degree)]
             edges = []
-            for segpoles in segpoleslst:
+            for segpoles in self._segpoleslst(fp):
 #                if len(segpoles) == fp.Degree # would skip additional poles
                  c = Part.BezierCurve() #last segment may have lower degree
                  c.increase(len(segpoles))

src/Mod/Draft/DraftGui.py

@@ -283,6 +283,7 @@ class DraftToolBar:
 
         self.addButton = self._pushbutton("addButton", self.layout, icon="Draft_AddPoint", width=22, checkable=True)
         self.delButton = self._pushbutton("delButton", self.layout, icon="Draft_DelPoint", width=22, checkable=True)
+        self.sharpButton = self._pushbutton("sharpButton", self.layout, icon="Draft_BezSharpNode", width=22, checkable=True)
         self.tangentButton = self._pushbutton("tangentButton", self.layout, icon="Draft_BezTanNode", width=22, checkable=True)
         self.symmetricButton = self._pushbutton("symmetricButton", self.layout, icon="Draft_BezSymNode", width=22, checkable=True)
 
@@ -373,6 +374,7 @@ class DraftToolBar:
         QtCore.QObject.connect(self.offsetValue,QtCore.SIGNAL("returnPressed()"),self.validatePoint)
         QtCore.QObject.connect(self.addButton,QtCore.SIGNAL("toggled(bool)"),self.setAddMode)
         QtCore.QObject.connect(self.delButton,QtCore.SIGNAL("toggled(bool)"),self.setDelMode)
+        QtCore.QObject.connect(self.sharpButton,QtCore.SIGNAL("toggled(bool)"),self.setSharpMode)
         QtCore.QObject.connect(self.tangentButton,QtCore.SIGNAL("toggled(bool)"),self.setTangentMode)
         QtCore.QObject.connect(self.symmetricButton,QtCore.SIGNAL("toggled(bool)"),self.setSymmetricMode)
         QtCore.QObject.connect(self.finishButton,QtCore.SIGNAL("pressed()"),self.finish)
@@ -450,6 +452,7 @@ class DraftToolBar:
         style = "#constrButton:Checked {background-color: "
         style += self.getDefaultColor("constr",rgb=True)+" } "
         style += "#addButton:Checked, #delButton:checked, "
+        style += "#sharpButton:Checked, "
         style += "#tangentButton:Checked, #symmetricButton:checked {"
         style += "background-color: rgb(20,100,250) }"
         self.baseWidget.setStyleSheet(style)
@@ -482,6 +485,7 @@ class DraftToolBar:
         self.occOffset.setText(translate("draft", "&OCC-style offset"))
         self.addButton.setToolTip(translate("draft", "Add points to the current object"))
         self.delButton.setToolTip(translate("draft", "Remove points from the current object"))
+        self.sharpButton.setToolTip(translate("draft", "Make Bezier node sharp"))
         self.tangentButton.setToolTip(translate("draft", "Make Bezier node tangent"))
         self.symmetricButton.setToolTip(translate("draft", "Make Bezier node symmetric"))
         self.undoButton.setText(translate("draft", "&Undo"))
@@ -679,6 +683,7 @@ class DraftToolBar:
             self.finishButton.hide()
             self.addButton.hide()
             self.delButton.hide()
+            self.sharpButton.hide()
             self.tangentButton.hide()
             self.symmetricButton.hide()
             self.undoButton.hide()
@@ -810,6 +815,7 @@ class DraftToolBar:
         self.addButton.show()
         self.delButton.show()
         if mode == 'BezCurve':
+            self.sharpButton.show()
             self.tangentButton.show()
             self.symmetricButton.show()
         self.finishButton.show()
@@ -817,6 +823,7 @@ class DraftToolBar:
         # always start Edit with buttons unchecked
         self.addButton.setChecked(False)
         self.delButton.setChecked(False)
+        self.sharpButton.setChecked(False)
         self.tangentButton.setChecked(False)
         self.symmetricButton.setChecked(False)
 
@@ -848,6 +855,7 @@ class DraftToolBar:
         self.delButton.setEnabled(mode)
 
     def setBezEditButtons(self,mode):
+        self.sharpButton.setEnabled(mode)
         self.tangentButton.setEnabled(mode)
         self.symmetricButton.setEnabled(mode)
 
@@ -1378,22 +1386,33 @@ class DraftToolBar:
         if self.addButton.isChecked():
             self.delButton.setChecked(False)
             self.symmetricButton.setChecked(False)
+            self.sharpButton.setChecked(False)
             self.tangentButton.setChecked(False)
 
     def setDelMode(self,bool):
         if self.delButton.isChecked():
             self.addButton.setChecked(False)
             self.symmetricButton.setChecked(False)
+            self.sharpButton.setChecked(False)
             self.tangentButton.setChecked(False)
 
+    def setSharpMode(self,bool):
+        if self.sharpButton.isChecked():
+            self.tangentButton.setChecked(False)
+            self.symmetricButton.setChecked(False)
+            self.addButton.setChecked(False)
+            self.delButton.setChecked(False)
+
     def setTangentMode(self,bool):
         if self.tangentButton.isChecked():
+            self.sharpButton.setChecked(False)
             self.symmetricButton.setChecked(False)
             self.addButton.setChecked(False)
             self.delButton.setChecked(False)
 
     def setSymmetricMode(self,bool):
         if self.symmetricButton.isChecked():
+            self.sharpButton.setChecked(False)
             self.tangentButton.setChecked(False)
             self.addButton.setChecked(False)
             self.delButton.setChecked(False)

src/Mod/Draft/DraftTools.py

@@ -3319,6 +3319,10 @@ class Edit(Modifier):
                                 if 'EditNode' in info["Component"]:
                                     self.delPoint(int(info["Component"][8:]))
                              # don't do tan/sym on DWire/BSpline!
+                            elif ((Draft.getType(self.obj) == "BezCurve") and 
+                                  (self.ui.sharpButton.isChecked())):
+                                if 'EditNode' in info["Component"]:
+                                    self.smoothBezPoint(int(info["Component"][8:]), info, 'Sharp')
                             elif ((Draft.getType(self.obj) == "BezCurve") and 
                                   (self.ui.tangentButton.isChecked())):
                                 if 'EditNode' in info["Component"]:
@@ -3354,14 +3358,48 @@ class Edit(Modifier):
                 self.obj.Closed = True
             # DNC: fix error message if edited point coinsides with one of the existing points
             if ( editPnt in pts ) == False:
-                if Draft.getType(self.obj) in ["BezCurve"] and self.obj.Degree >=3 and \
+                if Draft.getType(self.obj) in ["BezCurve"]:
-                    (self.editing % self.obj.Degree) == 0: #it's a knot
+                    knot = None
-                    if self.editing >= 1: #move left pole
+                    ispole = self.editing % self.obj.Degree #
-                        pts[self.editing-1] = pts[self.editing-1] + editPnt - pts[self.editing] 
+                    if ispole == 0: #knot
-                        self.trackers[self.editing-1].set(pts[self.editing-1])
+                        if self.obj.Degree >=3:
-                    if self.editing < len(pts)-1: #move right pole
+                            if self.editing >= 1: #move left pole
-                        pts[self.editing+1] = pts[self.editing+1] + editPnt - pts[self.editing] 
+                                knotidx = self.editing if self.editing < len(pts) else 0
-                        self.trackers[self.editing+1].set(pts[self.editing+1])
+                                pts[self.editing-1] = pts[self.editing-1] + \
+                                    editPnt - pts[knotidx]
+                                self.trackers[self.editing-1].set(\
+                                    pts[self.editing-1])
+                            if self.editing < len(pts)-1: #move right pole
+                                pts[self.editing+1] = pts[self.editing+1] + \
+                                    editPnt - pts[self.editing]
+                                self.trackers[self.editing+1].set(\
+                                    pts[self.editing+1])
+                            if self.editing == 0 and self.obj.Closed: # move last pole
+                                pts[-1] = pts [-1] + editPnt -pts[self.editing]
+                                self.trackers[-1].set(pts[-1])
+                    elif ispole == 1 and (self.editing >=2 or self.obj.Closed): #right pole
+                        knot = self.editing -1
+                        changep = self.editing -2 # -1 in case of closed curve
+                    elif ispole == self.obj.Degree-1 and \
+                            self.editing <= len(pts)-3: #left pole
+                        knot = self.editing +1
+                        changep = self.editing +2
+                    elif ispole == self.obj.Degree-1 and self.obj.Closed and \
+                            self.editing == len(pts)-1: #last pole
+                        knot = 0
+                        changep = 1
+                    if knot is not None: # we need to modify the oposite pole
+                        segment = knot / self.obj.Degree -1
+                        cont=self.obj.Continuity[segment] if \
+                            len(self.obj.Continuity) > segment else 0
+                        if cont == 1: #tangent
+                            pts[changep] = self.obj.Proxy.modifytangentpole(\
+                                    pts[knot],editPnt,pts[changep])
+                            self.trackers[changep].set(pts[changep])
+                        elif cont ==2: #symmetric
+                            pts[changep] = self.obj.Proxy.modifysymmetricpole(\
+                                    pts[knot],editPnt)
+                            self.trackers[changep].set(pts[changep])
                 pts[self.editing] = editPnt
                 self.obj.Points = pts
                 self.trackers[self.editing].set(v)
@@ -3463,6 +3501,11 @@ class Edit(Modifier):
                 pts.extend(edge.Curve.getPoles()[1:])
             if self.obj.Closed:
                 pts.pop()
+            c=self.obj.Continuity
+            # assume we have a tangent continuity for an arbitrarily split
+            # segment, unless it's linear
+            cont = 1 if (self.obj.Degree >= 2) else 0
+            self.obj.Continuity = c[0:edgeindex]+[cont]+c[edgeindex:]
         else:
             if ( Draft.getType(self.obj) == "Wire" ):
                 if (self.obj.Closed == True):
@@ -3510,64 +3553,111 @@ class Edit(Modifier):
             pts.pop(point)
             self.doc.openTransaction("Edit "+self.obj.Name)
             self.obj.Points = pts
+            if Draft.getType(self.obj) =="BezCurve":
+                self.obj.Proxy.resetcontinuity(self.obj)
             self.doc.commitTransaction()
             self.resetTrackers()
 
     def smoothBezPoint(self,point, info=None, style='Symmetric'):
-        if not (Draft.getType(self.obj) == "BezCurve"): return
+        style2cont = {'Sharp':0,'Tangent':1,'Symmetric':2}
+        if not (Draft.getType(self.obj) == "BezCurve"):return
         if  info['Component'].startswith('Edge'):
             return # didn't click control point
         pts = self.obj.Points
         deg = self.obj.Degree
-        if point % deg != 0:
+        if deg < 2: return
+        if point % deg != 0: #point is a pole
             if deg >=3: #allow to select poles
-                if point > 2 and point % deg == 1: #right pole
+                if (point % deg == 1) and (point > 2 or self.obj.Closed): #right pole
                     knot = point -1
                     keepp = point
                     changep = point -2
-                elif point -3 < len(pts): #left pole
+                elif point < len(pts) -3 and point % deg == deg -1: #left pole
                     knot = point +1
                     keepp = point
                     changep = point +2
+                elif point == len(pts)-1 and self.obj.Closed: #last pole
+                    # if the curve is closed the last pole has the last
+                    # index in the poits lists
+                    knot = 0
+                    keepp = point
+                    changep = 1
                 else:
-                    msg(translate("draft", "Can't change Knot belonging to that pole\n"),'warning')
+                    msg(translate("draft", "Can't change Knot belonging to pole %d\n"%point)\
+                        ,'warning')
                     return
                 if knot:
                     if style == 'Tangent':
-                        pts[changep] = self.obj.Proxy.modifytangentpole(pts[knot],pts[keepp],\
+                        pts[changep] = self.obj.Proxy.modifytangentpole(\
-                            pts[changep])
+                                pts[knot],pts[keepp],pts[changep])
-                    else:
+                    elif style == 'Symmetric':
-                        pts[changep] = self.obj.Proxy.modifysymmetricpole(pts[knot],pts[keepp])
+                        pts[changep] = self.obj.Proxy.modifysymmetricpole(\
+                                pts[knot],pts[keepp])
+                    else: #sharp
+                        pass #
             else:
-                msg(translate("draft", "Selection is not a Pole\n"),'warning')
+                msg(translate("draft", "Selection is not a Knot\n"),'warning')
                 return
-        elif (point == 0) or (point == (len(pts)-1)):
+        else: #point is a knot
-            msg(translate("draft", "Endpoint of BezCurve can't be smoothed\n"),'warning')
+            if style == 'Sharp':
-            return
+                if self.obj.Closed and point == len(pts)-1:
-        else:
+                    knot = 0
-            if style == 'Tangent':
+                else:
+                    knot = point
+            elif style == 'Tangent' and point > 0 and point < len(pts)-1:
                 prev, next = self.obj.Proxy.tangentpoles(pts[point],pts[point-1],pts[point+1])
-            else:
+                pts[point-1] = prev
+                pts[point+1] = next
+                knot = point #index for continuity
+            elif style == 'Symmetric' and point > 0 and point < len(pts)-1:
                 prev, next = self.obj.Proxy.symmetricpoles(pts[point],pts[point-1],pts[point+1])
-            pts[point-1] = prev
+                pts[point-1] = prev
-            pts[point+1] = next
+                pts[point+1] = next
-        self.obj.Points = pts
+                knot = point #index for continuity
+            elif self.obj.Closed and (style == 'Symmetric' or style == 'Tangent'):
+                if style == 'Tangent':
+                    pts[1],pts[-1] = self.obj.Proxy.tangentpoles(pts[0],pts[1],pts[-1])
+                elif style == 'Symmetric':
+                    pts[1],pts[-1] = self.obj.Proxy.symmetricpoles(pts[0],pts[1],pts[-1])
+                knot = 0
+            else:
+                msg(translate("draft", "Endpoint of BezCurve can't be smoothed\n"),'warning')
+                return
+        segment = knot // deg #segment index
+        newcont=self.obj.Continuity[:] #dont edit a property inplace !!!
+        if not self.obj.Closed and (len(self.obj.Continuity) == segment -1 or \
+                segment == 0) : pass # open curve
+        elif len(self.obj.Continuity) >= segment or \
+                self.obj.Closed and segment == 0 and \
+                len(self.obj.Continuity) >1:
+            newcont[segment-1] = style2cont.get(style)
+        else: #should not happen
+            FreeCAD.Console.PrintWarning('Continuity indexing error:'+\
+                'point:%d deg:%d len(cont):%d' % (knot,deg,\
+                len(self.obj.Continuity)))
         self.doc.openTransaction("Edit "+self.obj.Name)
+        self.obj.Points = pts
+        self.obj.Continuity=newcont
         self.doc.commitTransaction()
         self.resetTrackers()
  
     def resetTrackersBezier(self):
-        knotmarker = coin.SoMarkerSet.SQUARE_FILLED_9_9
+        knotmarkers = (coin.SoMarkerSet.DIAMOND_FILLED_9_9,#sharp
-        polemarker = coin.SoMarkerSet.CIRCLE_FILLED_9_9
+                coin.SoMarkerSet.SQUARE_FILLED_9_9,        #tangent
+                coin.SoMarkerSet.HOURGLASS_FILLED_9_9)     #symmetric
+        polemarker = coin.SoMarkerSet.CIRCLE_FILLED_9_9    #pole
         self.trackers=[]
+        cont=self.obj.Continuity
+        firstknotcont = cont[-1] if (self.obj.Closed and cont) else 0
         pointswithmarkers=[(self.obj.Shape.Edges[0].Curve.\
-                getPole(1),knotmarker)]
+                getPole(1),knotmarkers[firstknotcont])]
         for edgeindex, edge in enumerate(self.obj.Shape.Edges):
             poles=edge.Curve.getPoles()
             pointswithmarkers.extend([(point,polemarker) for \
                     point in poles[1:-1]])
             if not self.obj.Closed or len(self.obj.Shape.Edges) > edgeindex +1:
-                pointswithmarkers.append((poles[-1],knotmarker))
+                knotmarkeri=cont[edgeindex] if len(cont) > edgeindex else 0
+                pointswithmarkers.append((poles[-1],knotmarkers[knotmarkeri]))
         for index,pwm in enumerate(pointswithmarkers):
             p,marker=pwm
             if self.pl: p = self.pl.multVec(p)

src/Mod/Draft/Resources/Draft.qrc

@@ -6,6 +6,7 @@
         <file>icons/Draft_Arc.svg</file>
         <file>icons/Draft_BSpline.svg</file>
         <file>icons/Draft_BezCurve.svg</file>
+        <file>icons/Draft_BezSharpNode.svg</file>
         <file>icons/Draft_BezTanNode.svg</file>
         <file>icons/Draft_BezSymNode.svg</file>
         <file>icons/Draft_Circle.svg</file>

src/Mod/Draft/Resources/icons/Draft_BezSharpNode.svg

@@ -0,0 +1,304 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   version="1.1"
+   width="64"
+   height="64"
+   id="svg3612">
+  <defs
+     id="defs3614">
+    <linearGradient
+       id="linearGradient3144-6">
+      <stop
+         id="stop3146-9"
+         style="stop-color:#ffffff;stop-opacity:1"
+         offset="0" />
+      <stop
+         id="stop3148-2"
+         style="stop-color:#ffffff;stop-opacity:0"
+         offset="1" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient3701">
+      <stop
+         id="stop3703"
+         style="stop-color:#ffffff;stop-opacity:1"
+         offset="0" />
+      <stop
+         id="stop3705"
+         style="stop-color:#ffffff;stop-opacity:0"
+         offset="1" />
+    </linearGradient>
+    <radialGradient
+       cx="225.26402"
+       cy="672.79736"
+       r="34.345188"
+       fx="225.26402"
+       fy="672.79736"
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+       gradientUnits="userSpaceOnUse"
+       gradientTransform="matrix(1,0,0,0.6985294,0,202.82863)" />
+    <linearGradient
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+      <stop
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+         style="stop-color:#ffffff;stop-opacity:0"
+         offset="1" />
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+    <linearGradient
+       id="linearGradient3864-0-0">
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+      <stop
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+    <linearGradient
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+         style="stop-color:#faff2b;stop-opacity:1"
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+    <linearGradient
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+         id="stop3866-5"
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+    <linearGradient
+       id="linearGradient5048">
+      <stop
+         id="stop5050"
+         style="stop-color:#000000;stop-opacity:0"
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+      <stop
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+         style="stop-color:#000000;stop-opacity:1"
+         offset="0.5" />
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+         style="stop-color:#000000;stop-opacity:0"
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+    <linearGradient
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+      <stop
+         id="stop3843-1-3"
+         style="stop-color:#0619c0;stop-opacity:1"
+         offset="0" />
+      <stop
+         id="stop3845-0-8"
+         style="stop-color:#379cfb;stop-opacity:1"
+         offset="1" />
+    </linearGradient>
+    <radialGradient
+       cx="20.892099"
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