jointfinder 1.1.6

Find edge-to-edge and edge-to-surface joints of planar polygons

jointfinder

This package finds edge-to-edge and edge-to-surface joints of planar polygons.

Quickstart

This package accepts list of dictionaries as input. Each dictionary should have these elements:

• name part name
• points sequential points that make up a polygon in 3D cartesian coordinates, all points must be on a same plane (minimum 3 unique points per polygon)
• plane (optional) plane unit vector (left hand thumb direction, sequential points being the fingers)
• depth (optional, default: 0) polygon's thickness All scalars must be integer or float

polygons = []

# polygon name is #42
polygons += [{'name': 42, 
              'points': [[0, 0, 0], [0, 20, 0], [20, 20, 0], [20, 0, 0]]}]

# polygon name is #43
polygons += [{'name': 43, 
              'points': [[20, 0, 0], [20, 20, 0], [40, 20, 0], [40, 0, 0]]}]

polygons

Create JointFinder object. polygons input is tabulated as pandas dataframe. Accessible as object property df. Refer to pandas for more information on pandas.

from jointfinder import jf

JF = jf.JointFinder(polygons)
JF.df

Use plotting tool from util to view input polygons.

from jointfinder import util

util.plot(JF.df)

Use find_joint() object function to run for solution.

joints = JF.find_joint()
joints

Output is pandas dataframe. Suffices A and B in columns indicate indices, which polygon makes joint with which other polygon. Polygon A's edge makes a joint with polygon B's edge or surface. Each dataframe row indicates where a joint exists (x0, y0, z0 to x1, y1, z1). Column type indicates if it is a butt joint (1: edge to edge) or t-joint (0: edge to surface).

Dataframe as Input

Alternatively, users can create their dataframe themselves (or parse to from other sources) to input directly to JointFinder as it also accepts pandas dataframe as input (in addition to list of dictionaries). Do take note that the format must follow convention of object property df.

To simulate, use util.create_dummy_block() for test dataframe.

df = util.create_dummy_parts()
util.plot(df)

Similarly, create JointFinder object with test dataframe then run find_joint() object function.

JF = jf.JointFinder(df)
joints = JF.find_joint()
joints

Default test dataframe has three squares that make up a block with t-joints. To create more, pass number of rows and columns as x and y arguments to tile them.

E.g. util.create_dummy_block(x=2, y=1) creates blocks tiled in 2 x 1.

from jointfinder import jf, util

df = util.create_dummy_block(x=50, y=50)
JF = jf.JointFinder(df)
joints = JF.find_joint()
joints

Handling Large Dataframe

It is advised to run the module's jf directly from shell or console to better benefit from computing concurrency. Prior to running, the dataframe location must be first pickled (made persistent). Alternatively, it may also be accessed from memory location which user must find out manually. Input system argument dpath to indicate where the pickled dataframe is or from memory. Output will be saved in path stated in tpath.

util.save_df(df, 'test.pkl')
!python -m jointfinder.jf dpath=test.pkl tpath=test_result.pkl

As output is also pickled, use util.load_df() to load dataframe back to a variable. User may also export the result to other formats such as csv.

result = util.load_df('test_result.pkl')
result.to_csv('test_result.csv')

About

Beta version, v1.x.x, has limited features. Full release is from v1.2.0 onwards. Please visit https://github.com/SiDODOL/jointfinder after full release.

Singapore Institute of Technology. Email: [e-mail]; [e-mail]