Thomas Roche thoroc

For each hexagon in the tiling, draw its rectangular coordinates. The Y coordinate identifies the row, while the X identifies a sort of zig-zag column.

This type of coordinate system is widely used to address hexagons in a tiling, but has a drawback: It is not possible to interpret the coordinates of the hexes around the origin as unit vectors, therefore it is not possible in general to sum them to an hex position vector to obtain another one.

Compare with another take on hexagonal coordinates, which solves the problem.

Two example hexagons are also highlighted, to show the possibility of addressing an hexagon by using its coordinates.

d3.legend

d3.legend is a quick hack to add a legend to a d3 chart. Simply add a g and .call(d3.legend). Any elements that have a title set in the "data-legend" attribute will be included when d3.legend is called. Each title will appear only once (even when multiple items define the same data-legend) as the process uses a set based on a existing names, not an array of all items.

Color

By default the color in the legend will try to match the fill attribute or the stroke attribute of the relevant items. Color can be explicitly defined by attribute "data-legend-color"

Order

The order of items in the legend will be sorted using the top of the bounding box for each included item. The order can be explicitly defined by attribute "data-legend-pos"

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