This [block](https://bl.ocks.org/Kcnarf/81f4ce6a76abe132427a29b1519caee8) (a continuation of a [previous one](https://bl.ocks.org/Kcnarf/95fbcdb4e58a4e048867667c23071a28)) shows how to update an existing Voronoï map from an old set of weights to a set of new ones (in this demo, each weight is slightly updated). This is done thanks to the use of the [initialPosition()](https://github.com/Kcnarf/d3-voronoi-map#simulation_initialPosition) API in combination with the [initialWeight()](https://github.com/Kcnarf/d3-voronoi-map#voronoiMap_initialWeight) API, that allows to reuse previously computed coordinates and weights (cf. the _updateData_ function, and the first part of the _loop_ function).

This technique offers several advantages:

- it allows to maintain each cell in the same region from one Voronoï map to another, leading to a smooth and human friendly transitioning
- it comes with performance enhancement, as the final layout is no longer computed from scratch and profits from the former computation

Also, it is compatible with both the _live_ and _static_ arrangement introduced in the v2 major release of the [d3-voronoi-map](https://github.com/Kcnarf/d3-voronoi-map) plugin:

- live Voronoï map: displays the evolution of the self-organizing Voronoï map; each iteration is displayed, with some delay between iterations so that the animation is appealing to human eyes;
- static Voronoï map: displays only the final most representative Voronoï map, which is faster than the _live_ use case; intermediate iterations are silently computed, one after each other, without any delay.

Take a look at the code of the 'loop' function to understand how to obtain the _live_ and _satic_ arrangement.

#### User interactions :
* you can choose to use visualize the live arrangement (default), or simply the static final arrangement.
* you can choose to draw the Weighted Voronoï Diagram (default), the weights (visualized as circles), or both.
* you can hide/show sites (hide by default)
* you can choose among different rendering (greyscale, radial rainbow, or conical rainbow (default, having hard-&-fun time to implement it because canvas don't provides conical gradient)).

#### Acknowledgments to :
* [D3.js](https://d3js.org/) (v.6)
* [d3-voronoi-map](https://github.com/Kcnarf/d3-voronoi-map) plugin (v.2)
* [blockbuilder.org](http://blockbuilder.org)