91 lines
4.2 KiB
Python
91 lines
4.2 KiB
Python
#***************************************************************************
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#* *
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#* Copyright (c) 2016 *
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#* Jose Luis Cercos Pita <jlcercos@gmail.com> *
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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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import FreeCAD as App
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import Units
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import WeightInstance as Instance
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import shipUtils.Units as USys
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def createWeight(shapes, ship, density):
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"""Create a new weight instance
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Position arguments:
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shapes -- List of shapes of the weight
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ship -- Ship owner
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density -- Density of the object. 4 possibilities are considered here:
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* Density as Mass/Volume: then the weight will be considered as a
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volumetric object. Used for blocks or similar.
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* Density as Mass/Area: then the weight will be considered as an area
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element. Used for structural shells.
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* Density as Mass/Length: then the weight will be cosidered as a linear
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element. Used for linear structural reinforcements.
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* Mass: Then a punctual mass will be considered. Used for complex
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weights, like engines or other machines.
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Returned value:
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The new weight object
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It is strongly recommended to pass just shapes matching with the provided
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density, e.g. don't use volumetric shapes with a linear density value (kg/m)
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The tool will claim the new weight as a child of the ship object. Please do
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not remove the partner ship object before removing this new weight before.
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"""
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# Create the object
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obj = App.ActiveDocument.addObject("Part::FeaturePython", "Weight")
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weight = Instance.Weight(obj, shapes, ship)
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Instance.ViewProviderWeight(obj.ViewObject)
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# Setup the mass/density value
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m_unit = "kg"
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l_unit = "m"
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m_qty = Units.Quantity(1, Units.Mass)
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l_qty = Units.Quantity(1, Units.Length)
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a_qty = Units.Quantity(1, Units.Area)
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v_qty = Units.Quantity(1, Units.Volume)
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if density.Unit == m_qty.Unit:
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w_unit = m_unit
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obj.Mass = density.getValueAs(w_unit).Value
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elif density.Unit == (m_qty / l_qty).Unit:
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w_unit = m_unit + '/' + l_unit
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obj.LineDens = density.getValueAs(w_unit).Value
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elif density.Unit == (m_qty / a_qty).Unit:
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w_unit = m_unit + '/' + l_unit + '^2'
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obj.AreaDens = density.getValueAs(w_unit).Value
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elif density.Unit == (m_qty / v_qty).Unit:
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w_unit = m_unit + '/' + l_unit + '^3'
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obj.Dens = density.getValueAs(w_unit).Value
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# Set it as a child of the ship
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weights = ship.Weights[:]
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weights.append(obj.Name)
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ship.Weights = weights
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ship.Proxy.cleanWeights(ship)
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ship.Proxy.cleanTanks(ship)
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ship.Proxy.cleanLoadConditions(ship)
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App.ActiveDocument.recompute()
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return obj |