Set stroke width for parent groups

[spirtskhalava]

Hello,
How is it possible to change stroke width for every groups?

[Kcnarf]

The d3-voronoi-treemap uses a d3-hierarchy as the main structure to handle parent/child relationships of your data. Thus, when drawing a cell, you can make the 'stroke-width' depending on the 'depth' or the 'height' of your node within the d3-hierarchy. Take a look d3-hierarchy to know what kind of property will fit your needs, and the last 3 loc of the below code:

var rootNode = d3.hierarchy(nestedData); // a d3-hierarchy of your nested data
rootNode.sum(weightAccessor); // assigns the adequate weight to each node of the d3-hierarchy

var voronoiTreemap = d3.voronoiTreemap().clip([[0, 0], [0, height], [width, height], [width, 0]]); // sets the clipping polygon
voronoiTreemap(rootNode); // computes the weighted Voronoi tessellation of the d3-hierarchy; assigns a 'polygon' property to each node of the hierarchy
var allNodes = rootNode.descendants();
d3.selectAll('path')
  .data(allNodes)
  .enter()
  .append('path')
  .attr('d', function(d) {
    // d is a node
    return d3.line()(d.polygon) + 'z'; // d.polygon is the computed Voronoï cell encoding the relative weight of your underlying original data
  })
  .style('stroke-width', function(d) {
    return 5*d.data.depth; // d.data is a node of the d3-hierarchy, with 'height', 'depth', and many more attributes
  });

[Kcnarf]

Closing because it's not an issue with d3-voronoi-treemap, but more on its usage.