Introduced custom spacing property in the Rebar object

src/Mod/Arch/ArchRebar.py

@@ -20,6 +20,7 @@
 #*   USA                                                                   *
 #*                                                                         *
 #***************************************************************************
+# Modified Amritpal Singh <amrit3701@gmail.com> on 07-07-2017
 
 import FreeCAD,Draft,ArchComponent,DraftVecUtils,ArchCommands
 from FreeCAD import Vector
@@ -162,6 +163,7 @@ class _Rebar(ArchComponent.Component):
         obj.addProperty("App::PropertyFloat","Rounding","Arch",QT_TRANSLATE_NOOP("App::Property","The fillet to apply to the angle of the base profile. This value is multiplied by the bar diameter."))
         obj.addProperty("App::PropertyPlacementList","PlacementList","Arch",QT_TRANSLATE_NOOP("App::Property","List of placement of all the bars"))
         obj.addProperty("App::PropertyLink","Host","Arch",QT_TRANSLATE_NOOP("App::Property","The structure object that hosts this rebar"))
+        obj.addProperty("App::PropertyString", "CustomSpacing", "Arch", QT_TRANSLATE_NOOP("App::Property","The custom spacing of rebar"))
         self.Type = "Rebar"
         obj.setEditorMode("Spacing",1)
 
@@ -236,7 +238,7 @@ class _Rebar(ArchComponent.Component):
                     wire.translate(vinterval)
                     wires.append(wire)
         return [wires,obj.Diameter.Value/2]
-        
+
     def onChanged(self,obj,prop):
         if prop == "Host":
             if hasattr(obj,"Host"):
@@ -298,9 +300,13 @@ class _Rebar(ArchComponent.Component):
                 size = obj.Distance.Value
         #print(axis)
         #print(size)
+        spacinglist = None
+        if hasattr(obj, "CustomSpacing"):
+            if obj.CustomSpacing:
+                spacinglist = strprocessOfCustomSpacing(obj.CustomSpacing)
+                influenceArea = sum(spacinglist) - spacinglist[0] / 2 - spacinglist[-1] / 2
         if (obj.OffsetStart.Value + obj.OffsetEnd.Value) > size:
             return
-
         # all tests ok!
         pl = obj.Placement
         import Part
@@ -335,6 +341,23 @@ class _Rebar(ArchComponent.Component):
                 placementlist.append(barplacement)
             if hasattr(obj,"Spacing"):
                 obj.Spacing = interval
+        # Calculate placement of bars from custom spacing.
+        if spacinglist:
+            placementlist[:] = []
+            reqInfluenceArea = size - (obj.OffsetStart.Value + obj.OffsetEnd.Value)
+            if influenceArea > reqInfluenceArea:
+                return FreeCAD.Console.PrintError("Influence area of rebars is greater than "+ str(reqInfluenceArea) + ".\n")
+            elif influenceArea < reqInfluenceArea:
+                FreeCAD.Console.PrintWarning("Last span is greater that end offset.\n")
+            for i in range(len(spacinglist)):
+                if i == 0:
+                    barplacement = CustomSpacingPlacement(spacinglist, 1, axis, father.Placement.Rotation, obj.OffsetStart.Value, obj.OffsetEnd.Value)
+                    placementlist.append(barplacement)
+                else:
+                    barplacement = CustomSpacingPlacement(spacinglist, i+1, axis, father.Placement.Rotation, obj.OffsetStart.Value, obj.OffsetEnd.Value)
+                    placementlist.append(barplacement)
+            obj.Amount = len(spacinglist)
+            obj.Spacing = 0
         obj.PlacementList = placementlist
         for i in range(len(obj.PlacementList)):
             if i == 0:
@@ -385,5 +408,43 @@ def CalculatePlacement(baramount, barnumber, size, axis, rotation, offsetstart,
     placement = FreeCAD.Placement(barplacement, rotation)
     return placement
 
+def CustomSpacingPlacement(spacinglist, barnumber, axis, rotation, offsetstart, offsetend):
+    """ CustomSpacingPlacement(spacinglist, barnumber, axis, rotation, offsetstart, offsetend):
+    Calculate placement of the bar from custom spacing list."""
+    if barnumber == 1:
+        bardistance = offsetstart
+    else:
+        bardistance = sum(spacinglist[0:barnumber])
+        bardistance = bardistance - spacinglist[0] / 2
+        bardistance = bardistance - spacinglist[barnumber - 1] / 2
+        bardistance = bardistance + offsetstart
+    barplacement = DraftVecUtils.scaleTo(axis, bardistance)
+    placement = FreeCAD.Placement(barplacement, rotation)
+    return placement
+
+def strprocessOfCustomSpacing(span_string):
+    """ strprocessOfCustomSpacing(span_string): This function take input
+    in specific syntax and return output in the form of list. For eg.
+    Input: "3@100+2@200+3@100"
+    Output: [100, 100, 100, 200, 200, 100, 100, 100]"""
+    import string
+    span_st = string.strip(span_string)
+    span_sp = string.split(span_st, '+')
+    index = 0
+    spacinglist = []
+    while index < len(span_sp):
+        # Find "@" recursively in span_sp array.
+        # If not found, append the index value to "spacinglist" array.
+        if string.find(span_sp[index],'@') == -1:
+            spacinglist.append(float(span_sp[index]))
+        else:
+            in_sp = string.split(span_sp[index], '@')
+            count = 0
+            while count < int(in_sp[0]):
+                spacinglist.append(float(in_sp[1]))
+                count += 1
+        index += 1
+    return spacinglist
+
 if FreeCAD.GuiUp:
     FreeCADGui.addCommand('Arch_Rebar',_CommandRebar())