Geometry editing for E+ idf files

Project description

GeomEppy
========

|Build Status| for Python 2.7, 3.5, 3.6 via Travis

|CodeCov| via CodeCov

|Docs Status| on Read the Docs

GeomEppy is a scripting language for use with Eppy, which in turn is a
scripting language for EnergyPlus IDF files and output files.

It primarily adds functions to do with IDF geometry, including zones,
surfaces, constructions, etc.

Installation
------------

GeomEppy requires Numpy, Shapely, and optionally Matplotlib.

`pip install geomeppy`

Full docs
---------

Complete documentation is hosted at `Read the Docs <http://geomeppy.readthedocs.io/en/latest/?>`_. This covers the internals of geomeppy,
and may be subject to change. Features documented in the API section below can be relied upon to remain stable.

API
---

The API for GeomEppy depends on replacing an Eppy IDF object with a
GeomEppy IDF object. To use this, you will need to import IDF from
GeomEppy rather than directly from Eppy.

``from eppy.modeleditor import IDF``. All other features of the current
release version of Eppy will still be available.

GeomEppy then provides a simple Python API for actions on the IDF
object:

- Intersecting and matching surfaces

``IDF.intersect() # intersects all surfaces``

``IDF.match() # sets boundary conditions of surfaces``

``IDF.intersect_match() # intersect surfaces then set/update boundary conditions``

- Moving an IDF

``IDF.translate_to_origin() # move the whole IDF close to 0,0 on the x, y axes``

``IDF.translate([50, 20]) # move the whole IDF to x + 50, y + 20``

``IDF.translate([0, 0, 10]) # move the whole IDF to z + 10``

- Rotating an IDF

``IDF.rotate(90) # rotate the IDF 90 degrees counterclockwise around the centre of its bounding box``

``IDF.scale(2) # scale the IDF to double its size (default is on the xy axes)``

``IDF.scale(2, axes='xy') # scale the IDF to double its size (in the xy axes)``

``IDF.scale(2, axes='z') # scale the IDF to double its size (in the z axis)``

- Adding windows to external walls

``IDF.set_wwr() # set a WWR of 20% (the default) for all external walls``

``IDF.set_wwr(wwr=0.25) # set a WWR of 25% for all external walls``

``IDF.set_wwr(wwr_map={90: 0}) # set no windows on all external walls with azimuth of 90, and WWR of 20% on other walls``

``IDF.set_wwr(wwr=0, wwr_map={90: 0.3}) # set a WWR of 30% for all external walls with azimuth of 90, and no windows on other walls``

If ``wwr_map`` is passed, it overrides any value passed to ``wwr``, including
the default of 0.2. However it only overrides it on walls which have an
azimuth in the ``wwr_map``. Any omitted walls' WWR will be set to the value in
``wwr``. If you want to specify no windows for walls which are not specified in
``wwr_map``, you must also set ``wwr=None``.

- Setting constructions

``IDF.set_default_constructions() # set a name for each construction in the model``

- Viewing a simple 3D representation of an IDF

``IDF.view_model() # shows a zoomable, rotatable transparent model``

- Exporting a 3D OBJ file model

``IDF.to_obj('mymodel.obj')``

You can view the exported model `here <https://3dviewer.net/>`_. Just drag the .obj file
and .mtl file into the browser window.

|OBJ viewer|

- Get all surfaces in a model

``IDF.getsurfaces()``

- Get all surfaces in a model of a given type

``IDF.getsurfaces('wall') # only works if the surface type has been set in the IDF``

- Get all subsurfaces in a model

``IDF.getsubsurfaces()``

- Get all subsurfaces in a model of a given type

``IDF.getsubsurfaces('window') # only works if the surface type has been set in the IDF``

- Automatic geometry building

This method requires some explanation. The parameters required are:

::

name : str
A name for the block.
coordinates : list
A list of (x, y) tuples representing the building outline.
height : float
The height of the block roof above ground level.
num_stories : int, optional
The total number of stories including basement stories. Default : 1.
below_ground_stories : int, optional
The number of stories below ground. Default : 0.
below_ground_storey_height : float, optional
The height of each basement storey. Default : 2.5.
zoning : str, optional
The rules to use in creating zones. Currently the only option is `by_storey` which sets each storey in the block as a Zone.

The block generated will have boundary conditions set correctly and any
intersections with adjacent blocks will be handled automatically. The
surface type will be set to ``wall``, ``floor``, ``ceiling`` or ``roof``
for each surface. Constructions are not set automatically so these will
need to be added afterwards in the normal way for Eppy.

Other functions
---------------

GeomEppy also provides some additional functions such as
``surface.setcoords(...)``

::

wall = idf.newidfobject(
'BUILDINGSURFACE:DETAILED',
Name='awall',
Surface_Type = 'wall',
)
wall.setcoords([(0,0,1),(0,0,0),(1,0,0),(1,0,1)])

Forthcoming
-----------

- Geometry validation and correction
- Geometry simplification

.. |Build Status| image:: https://travis-ci.org/jamiebull1/geomeppy.svg?branch=master
:target: https://travis-ci.org/jamiebull1/geomeppy
.. |CodeCov| image:: https://img.shields.io/codecov/c/github/jamiebull1/geomeppy/master.svg
:target: https://codecov.io/github/jamiebull1/geomeppy
.. |OBJ viewer| image:: https://github.com/jamiebull1/geomeppy/tree/master/img/obj_viewer.png