Macro for FreeCAD to create boxes suitable for laser cutting

box.py

# Macro for FreeCAD to create boxes suitable for laser cutting

from FreeCAD import Base, Vector, Matrix
import Part

class BoxCfg:
	def __init__(self, thickness, notches):
		self.thickness = thickness
		self.notches = notches
		self.piece_size = 60

class VGen:
	def __init__(self, current, dir):
		if dir == 'right':
			self.x_x = 1
			self.x_y = 0
			self.y_x = 0
			self.y_y = 1
		elif dir == 'left':
			self.x_x = -1
			self.x_y = 0
			self.y_x = 0
			self.y_y = -1
		elif dir == 'down':
			self.x_x = 0
			self.x_y = -1
			self.y_x = 1
			self.y_y = 0
		elif dir == 'up':
			self.x_x = 0
			self.x_y = 1
			self.y_x = -1
			self.y_y = 0
		else:
			raise Exception('Bad dir: ' + dir)

		self.current = current
		self.list = []

	def move(self, x, y, z):
		self.current = self.current.add(Vector(x, y, z))
		self.list.append(self.current)

	def moveX(self, value):
		self.move(self.x_x * value, self.x_y * value, 0)

	def moveY(self, value):
		self.move(self.y_x * value, self.y_y * value, 0)

def line1(cfg, start, dir, inv, include_start):
	x = 10
	if inv:
		inv = -1
	else:
		inv = 1

	g = VGen(start, dir)

	if include_start:
		g.moveX(cfg.thickness)

	g.moveX(x)
	for i in range(0, cfg.notches):
		g.moveY(-cfg.thickness * inv)
		g.moveX(x)
		g.moveY(cfg.thickness * inv)
		g.moveX(x)

	if include_start:
		g.moveX(cfg.thickness)
	return g.list

def largePolygon(cfg):
	v = [Vector(0, 0, 0)]
	top = line1(cfg, v[-1], 'right', False, True); v.extend(top)
	left = line1(cfg, v[-1], 'down', False, True); v.extend(left)
	bottom = line1(cfg, v[-1], 'left', False, True); v.extend(bottom)
	right = line1(cfg, v[-1], 'up', False, True); v.extend(right)
  	return v

def mediumPolygon(cfg):
	v = [Vector(cfg.thickness, 0, 0)]
	top = line1(cfg, v[-1], 'right', False, False); v.extend(top)
	left = line1(cfg, v[-1], 'down', True, True); v.extend(left)
	bottom = line1(cfg, v[-1], 'left', False, False); v.extend(bottom)
	right = line1(cfg, v[-1], 'up', True, True); v.extend(right)
  	return v

def smallPolygon(cfg):
	v = [Vector(cfg.thickness, 0, 0)]
	top = line1(cfg, v[-1], 'right', True, False); v.extend(top)
	left = line1(cfg, v[-1], 'down', True, False); v.extend(left)
	bottom = line1(cfg, v[-1], 'left', True, False); v.extend(bottom)
	right = line1(cfg, v[-1], 'up', True, False); v.extend(right)
  	return v

print("------------------------------------")
doc = FreeCAD.newDocument()
doc.saveAs("/tmp/foo.fcstd")

# front back left
# right top bottom

cfg = BoxCfg(3, 2)

m = Matrix()
m.move(cfg.piece_size * -0.5, 0, 0)
s = Part.makePolygon(largePolygon(cfg))
s.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Front").Shape = s

m = Matrix()
m.move(cfg.piece_size * 0.5, 0, 0)
s = Part.makePolygon(largePolygon(cfg))
s.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Back").Shape = s

m = Matrix()
m.move(cfg.piece_size * 1.5, 0, 0)
l = Part.makePolygon(mediumPolygon(cfg))
l.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Left").Shape = l

m = Matrix()
m.move(cfg.piece_size * -0.5, cfg.piece_size * -1, 0)
l = Part.makePolygon(smallPolygon(cfg))
l.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Right").Shape = l

m = Matrix()
m.move(cfg.piece_size * 0.5, cfg.piece_size * -1, 0)
l = Part.makePolygon(smallPolygon(cfg))
l.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Top").Shape = l

m = Matrix()
m.move(cfg.piece_size * 1.5, cfg.piece_size * -1, 0)
l = Part.makePolygon(mediumPolygon(cfg))
l.transformShape(m)
FreeCAD.ActiveDocument.addObject("Part::Feature", "Bottom").Shape = l

Gui.ActiveDocument = doc
Gui.SendMsgToActiveView("ViewFit")