160 lines
7.1 KiB
Python
160 lines
7.1 KiB
Python
#***************************************************************************
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#* *
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#* Copyright (c) 2021 Yorik van Havre <yorik@uncreated.net> *
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#* *
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#* This program is free software; you can redistribute it and/or modify *
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#* it under the terms of the GNU Lesser General Public License (LGPL) *
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#* as published by the Free Software Foundation; either version 2 of *
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#* the License, or (at your option) any later version. *
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#* for detail see the LICENCE text file. *
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#* *
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#* This program is distributed in the hope that it will be useful, *
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#* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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#* GNU Library General Public License for more details. *
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#* *
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#* You should have received a copy of the GNU Library General Public *
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#* License along with this program; if not, write to the Free Software *
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#* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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#* USA *
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#* *
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#***************************************************************************
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"""This module contains FreeCAD commands for the Draft workbench"""
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import os
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import FreeCAD as App
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from draftutils.translate import translate, QT_TRANSLATE_NOOP
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from draftgeoutils.general import geomType
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from draftobjects.base import DraftObject
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class Hatch(DraftObject):
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def __init__(self,obj):
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obj.Proxy = self
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self.setProperties(obj)
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def setProperties(self,obj):
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pl = obj.PropertiesList
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if not "Base" in pl:
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obj.addProperty("App::PropertyLink","Base","Hatch",
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QT_TRANSLATE_NOOP("App::Property","The base object used by this object"))
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if not "File" in pl:
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obj.addProperty("App::PropertyFile","File","Hatch",
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QT_TRANSLATE_NOOP("App::Property","The PAT file used by this object"))
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if not "Pattern" in pl:
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obj.addProperty("App::PropertyString","Pattern","Hatch",
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QT_TRANSLATE_NOOP("App::Property","The pattern name used by this object"))
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if not "Scale" in pl:
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obj.addProperty("App::PropertyFloat","Scale","Hatch",
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QT_TRANSLATE_NOOP("App::Property","The pattern scale used by this object"))
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if not "Rotation" in pl:
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obj.addProperty("App::PropertyAngle","Rotation","Hatch",
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QT_TRANSLATE_NOOP("App::Property","The pattern rotation used by this object"))
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if not "Translate" in pl:
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obj.addProperty("App::PropertyBool","Translate","Hatch",
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QT_TRANSLATE_NOOP("App::Property","If set to False, hatch is applied as is to the faces, without translation (this might give wrong results for non-XY faces)"))
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obj.Translate = True
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self.Type = "Hatch"
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def onDocumentRestored(self,obj):
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self.setProperties(obj)
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def dumps(self):
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return None
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def loads(self,state):
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return None
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def execute(self,obj):
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if self.props_changed_placement_only(obj) \
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or not obj.Base \
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or not obj.File \
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or not obj.Pattern \
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or not obj.Scale \
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or not obj.Pattern in self.getPatterns(obj.File) \
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or not obj.Base.isDerivedFrom("Part::Feature") \
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or not obj.Base.Shape.Faces:
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self.props_changed_clear()
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return
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import Part
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import TechDraw
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shapes = []
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for face in obj.Base.Shape.Faces:
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if face.findPlane(): # Only planar faces.
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face = face.copy()
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if obj.Translate:
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mtx = None
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w = face.normalAt(0, 0)
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# Try to base a matrix on the first straight edge with
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# a reasonable length (> 0.001):
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for e in face.Edges:
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if geomType(e) == "Line":
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sta = e.firstVertex().Point
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end = e.lastVertex().Point
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u = end.sub(sta)
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if u.Length > 0.001:
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u = u.normalize()
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v = w.cross(u)
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mtx = App.Matrix(u.x, v.x, w.x, sta.x,
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u.y, v.y, w.y, sta.y,
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u.z, v.z, w.z, sta.z,
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0.0, 0.0, 0.0, 1.0)
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break
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# If no suitable straight edge was found use a default matrix:
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if not mtx:
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cen = face.CenterOfMass
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rot = App.Rotation(App.Vector(0, 0, 1), w)
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mtx = App.Placement(cen, rot).Matrix
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face = face.transformShape(mtx.inverse()).Faces[0]
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# In TechDraw edges longer than 9999.9 (ca. 10m) are considered 'crazy'.
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# Lines in a hatch pattern are also checked. In the code below 9999 is
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# used. With extra scaling based on that value a 1000m x 1000m rectangle
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# can be hatched. Tested with pattern: Diagonal4, and pattern scale: 1000.
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# With a limit of 9999.9 the same test fails.
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if face.BoundBox.DiagonalLength > 9999:
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extra_scale = 9999 / face.BoundBox.DiagonalLength
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else:
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extra_scale = 1.0
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face.scale(extra_scale)
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if obj.Rotation.Value:
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face.rotate(App.Vector(), App.Vector(0, 0, 1), -obj.Rotation)
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shape = TechDraw.makeGeomHatch(face, obj.Scale * extra_scale, obj.Pattern, obj.File)
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shape.scale(1 / extra_scale)
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if obj.Rotation.Value:
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shape.rotate(App.Vector(), App.Vector(0, 0, 1), obj.Rotation)
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if obj.Translate:
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shape = shape.transformShape(mtx)
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shapes.append(shape)
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if shapes:
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obj.Shape = Part.makeCompound(shapes)
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self.props_changed_clear()
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def onChanged(self, obj, prop):
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self.props_changed_store(prop)
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def getPatterns(self,filename):
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"""returns a list of pattern names found in a PAT file"""
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patterns = []
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if os.path.exists(filename):
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with open(filename) as patfile:
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for line in patfile:
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if line.startswith("*"):
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patterns.append(line.split(",")[0][1:])
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return patterns
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