hologridgen 1.0.2

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# hologridgen

Interactive tool for the generation of orthonormal grids using [pygridgen](https://github.com/pygridgen/pygridgen) and the [HoloViz](holoviz.org) tool suite for use within [Jupyter notebooks](https://jupyter.org/) or deployable with [Panel](panel.pyviz.org).

## Installation

Until hologridgen is made available on conda-forge you can install it as follows in a Python 3.7 conda environment:

` conda install -c jlstevens -c conda-forge hologridgen `

If you need a new, blank Python 3.7 conda environment, you can create it and activate it using:

` conda create -n hologridgen python=3.7 conda activate hologridgen `

## Core features

• Add, move and delete nodes. First node indicated with a special marker (triangle by default)

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/add-mode-delete.gif”></img>

• Toggle node polarity (beta) with the Tap Tool. Generate Mesh button indicates when mesh generation is possible. Hide button to hide current grid/mesh.

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/polarity-toggle.gif”></img>

• Easy insertion of new nodes into edges selected with the Tap Tool (which can then be easily moved):

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/edge_insertion.gif”></img>

• Pythonic access of boundary as it is drawn and the grid once it is generated:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/pythonic-access.gif”></img>

• Easy adjustment of node size and edge width via the GUI. Easy regeneration with different x- and y-resolutions:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/node-edge-size.gif”></img>

• Easy selection between a predefined set of tile sources in the background:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/tilesources.gif”></img>

• Easy use of a custom element (e.g a different tile source) as the background:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/custom_background.gif”></img>

• Download boundary as GeoJSON:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/geojson_download.gif”></img>

• Capture serializable editor state and restore from it (can also be restored from a geopandas boundary DataFrame):

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/save_restore_state.gif”></img>

• Set a focus function and update mesh accordingly:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/focus_edit.gif”></img>

• Highly customizable styling of boundary, nodes and start marker:

<img width=400 src=”https://github.com/pygridgen/hologridgen/blob/master/images/customizable_style.gif”></img>

• Can be served as a Panel dashboard using the serveable() method.