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====== Tutorial FreeCAD Playground ======

[[http://www.bolts-library.org/en/index.html]]
===== Macro freecad =====

  * [[http://www.freecadweb.org/wiki/index.php?title=Macros]]

===== Stampa funzioni =====

  # F = variable used in the function,
  # X = initial value of x,
  # Nb = Number of step,
  # Z = function express with x
  # ZZ = function express with xx
   
  import FreeCAD, FreeCADGui, Part
  import math
  
  F=800
  X=-500
  Nb=10
  Step=1000/Nb
  Y=0
  for I in range(Nb):
      XX=X+Step 
      Z=X*X/(4*F)
      ZZ=XX*XX/(4*F)
      if I==0:
          print "Le test est vrai !"
          nomme=Part.makeLine((X,Y,Z),(XX,Y,ZZ))
          WWire=Part.Wire([nomme])
      else:
          print "Le test est 2 !"
          nomme=Part.makeLine((X,Y,Z),(XX,Y,ZZ))		
          WWire=Part.Wire([WWire,nomme])
      X=XX 
  
  Part.show(WWire)

===== FreeCAD and pyQt =====

  import FreeCAD, FreeCADGui, Part
  from PyQt4 import QtGui,QtCore
   
  def proceed():
      try:
          u = (int(l1.text()),float(l2.text()))   
          v = (int(l3.text()),float(l4.text()))
      except:
          FreeCAD.Console.PrintError("Wrong input! Only numbers allowed...\n")
      sel = FreeCADGui.Selection.getSelection()
      if sel:
          sel = sel[0]
          name = sel.Name   
          shape = sel.Shape
          for column in range(u[0]):
              for row in range(v[0]):
                  if (column != 0) or (row != 0):
                      delta = FreeCAD.Vector(column*u[1],row*v[1],0)
                      newshape = sel.Shape.copy()
                      newshape.translate(delta)
                      newobject = FreeCAD.ActiveDocument.addObject("Part::Feature",name)
                      newobject.Shape = newshape
      else:
          FreeCAD.Console.PrintError("Error: One object must be selected")
      hide()
  
  def hide():
      dialog.hide()
  
  dialog = QtGui.QDialog()
  dialog.resize(200,300)
  dialog.setWindowTitle("Array")
  la = QtGui.QVBoxLayout(dialog)
  t1 = QtGui.QLabel("number of columns")
  la.addWidget(t1)
  l1 = QtGui.QLineEdit()
  la.addWidget(l1)
  t2 = QtGui.QLabel("distance between columns")
  la.addWidget(t2)
  l2 = QtGui.QLineEdit()
  la.addWidget(l2)
  t3 = QtGui.QLabel("number of rows")
  la.addWidget(t3)
  l3 = QtGui.QLineEdit()
  la.addWidget(l3)
  t4 = QtGui.QLabel("distance between rows")   
  la.addWidget(t4)
  l4 = QtGui.QLineEdit()
  la.addWidget(l4)
  okbox = QtGui.QDialogButtonBox(dialog)
  okbox.setOrientation(QtCore.Qt.Horizontal)
  okbox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
  la.addWidget(okbox)
  QtCore.QObject.connect(okbox, QtCore.SIGNAL("accepted()"), proceed)
  QtCore.QObject.connect(okbox, QtCore.SIGNAL("rejected()"), hide)
  QtCore.QMetaObject.connectSlotsByName(dialog)
  dialog.show()

===== Barra filettata =====

Codice per creare una barra filettata (tratto da http://forum.freecadweb.org/viewtopic.php?f=3&t=1461)

  import Part, FreeCAD, math
  from FreeCAD import Base
  
  d = 20.0
  p = 2.5
  h = p/2
  
  r = d / 2.0
  hp = p * math.tan(math.pi/3.0)
  dmin = d - 5.0 * hp /8.0
  rmin = dmin / 2.0
  
  edges = []
  z1 = p/8.0
  z2 = 7.0*p/16.0
  rmax = r*1.05
  edges.append( Part.makeLine((rmin,0,z1), (rmin,0,-z1)) )
  edges.append( Part.makeLine((rmin,0,-z1), (r,0,-z2)) )
  edges.append( Part.makeLine((r,0,-z2), (rmax,0,-z2)) )
  edges.append( Part.makeLine((rmax,0,-z2), (rmax,0,z2)) )
  edges.append( Part.makeLine((rmax,0,z2), (r,0,z2), ) )
  edges.append( Part.makeLine((r,0,z2), (rmin,0,z1)) )
  extSection = Part.Wire( edges )
  helix = Part.makeHelix(p,h,r)
  makeSolid = True
  isFrenet = True
  extSolid = helix.makePipeShell([extSection],makeSolid,isFrenet)
  
  intSolid = Part.makeCylinder(r,h,Base.Vector(0,0,0),Base.Vector(0,0,1))
  
  screw = intSolid.cut(extSolid)
  
  Part.show(screw)



  import Part, FreeCAD, math
  from FreeCAD import Base
  
  def drawHelix(p, h, r):
        edges = []
        nSpire = int(h / p)
        nStep = 16
        t = 0.0
        Dt = 2 * math.pi / nStep
        p1 = (r*math.cos(t), r*math.sin(t), p*t/(2.0*math.pi) )
        p2 = (r*math.cos(t+Dt), r*math.sin(t+Dt), p*(t+Dt)/(2.0*math.pi) )
        for i in range(nSpire*nStep):
            edges.append( Part.makeLine(p1, p2) )
            t += Dt
            p1 = (r*math.cos(t), r*math.sin(t), p*t/(2.0*math.pi) )
            p2 = (r*math.cos(t+Dt), r*math.sin(t+Dt), p*(t+Dt)/(2.0*math.pi) )
        return Part.Wire( edges )
  
  d = 18.0
  p = 2.5
  h = 10.0
  
  r = d / 2.0
  hp = p * math.tan(math.pi/3.0)
  dmin = d - 5.0 * hp /8.0
  rmin = dmin / 2.0
  
  edges = []
  z1 = p/8.0
  z2 = 7.0*p/16.0
  rmax = r*1.05
  edges.append( Part.makeLine((rmin,0,z1), (r,0,z2)) )
  # edges.append( Part.makeLine((r,0,z2), (rmax,0,z2)) )
  # edges.append( Part.makeLine((rmax,0,z2), (rmax,0,-z2)) )
  # edges.append( Part.makeLine((rmax,0,-z2), (r,0,-z2)) )
  edges.append( Part.makeLine((r,0,z2), (r,0,-z2)) )
  edges.append( Part.makeLine((r,0,-z2), (rmin,0,-z1)) )
  edges.append( Part.makeLine((rmin,0,-z1), (rmin,0,z1)) )
  extSection = Part.Wire( edges )
  // helix = Part.makeHelix(p,h,r)
  helix = drawHelix(p,h,r)
  makeSolid = True
  isFrenet = True
  extSolid = helix.makePipeShell([extSection],makeSolid,isFrenet)
  
  intSolid = Part.makeCylinder(r,h,Base.Vector(0,0,0),Base.Vector(0,0,1))
  
  screw = intSolid.cut(extSolid)
  
  Part.show(screw)



  import Part, FreeCAD, math
  from FreeCAD import Base
  
  d = 5.0
  h = 10.0
  p = 2.5
  r = d/2.0
  helix = Part.makeHelix(1,h,r)
  edges = []
  edges.append( Part.makeLine((2.5,0,-0.125), (2.5,0,0.125)) )
  edges.append( Part.makeLine((2.5,0,0.125), (3.1,0,0.419)) )
  edges.append( Part.makeLine((3.1,0,0.419), (3.1,0,-0.419)) )
  edges.append( Part.makeLine((3.1,0,-0.419), (2.5,0,-0.125)) )
  section = Part.Wire(edges)
  makeSolid=True
  isFrenet=True
  pipe = Part.Wire(helix).makePipeShell([section],makeSolid,isFrenet)
  
  cylinder = Part.makeCylinder(r,h,Base.Vector(0,0,0),Base.Vector(0,0,1))
  
  diff = cylinder.cut(pipe)
  
  Part.show(diff)


longHelix bug: 
  * [[http://forum.freecadweb.org/viewtopic.php?f=10&t=6355&start=10]]
  * [[http://freecadweb.org/tracker/view.php?id=0954]]


  import Part, FreeCAD, math
  from FreeCAD import Base
  
  d = 20.0
  r1 = d/2
  r2 = r1 - 2.0
  p = 10.0
  h = 5*p
  h1 = 5.0
  helixExtBot = Part.makeHelix(p,h,r1)
  helixExtUp = Part.makeHelix(p,h,r1)
  helixExtUp.translate((0,0,h1))
  helixIntBot = Part.makeHelix(p,h,r2)
  helixIntUp = Part.makeHelix(p,h,r2)
  helixIntUp.translate((0,0,h1))
  lBotBot = Part.makeLine((r1, 0, 0),(r2, 0, 0))
  lBotUp = Part.makeLine((r1, 0, h1),(r2, 0, h1))
  lUpBot = Part.makeLine((r1, 0, h),(r2, 0, h))
  lUpUp = Part.makeLine((r1, 0, h+h1),(r2, 0, h+h1))
  
  vertExt = Part.makeRuledSurface(helixExtBot, helixExtUp)
  vertInt = Part.makeRuledSurface(helixIntBot, helixIntUp)
  horBot = Part.makeRuledSurface(helixExtBot, helixIntBot)
  horUp = Part.makeRuledSurface(helixExtUp, helixIntUp)
  retBot = Part.makeRuledSurface(lBotBot, lBotUp)
  retUp = Part.makeRuledSurface(lUpBot, lUpUp)
  
  shell = Part.makeShell( [vertExt.Faces[0], vertInt.Faces[0], horBot.Faces[0], horUp.Faces[0], retBot.Faces[0], retUp.Faces[0]] )
  solid = Part.makeSolid(shell)
  Part.show(solid)

===== Compilare FreeCAD su Windows =====


  * [[https://docs.google.com/document/d/12PrAuPD7TQN1dqhqTmncqbwsX9nZ1dEHmSWHZ_FvIOs/edit?pli=1]]
  * [[http://www.freecadweb.org/wiki/index.php?title=CompileOnWindows]]
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