Treemap layout for hierarchical data as nested rectangles.

Treemaps display hierarchical data as a set of nested rectangles, where the area of each rectangle is proportional to its value.

Examples

data = %{
  name: "root",
  children: [
    %{name: "A", value: 100},
    %{name: "B", value: 200},
    %{name: "C", children: [
      %{name: "C1", value: 50},
      %{name: "C2", value: 75}
    ]}
  ]
}

# Build hierarchy and compute values
root = Visualize.Layout.Hierarchy.new(data)
  |> Visualize.Layout.Hierarchy.sum(fn d -> d[:value] || 0 end)

# Apply treemap layout
treemap = Visualize.Layout.Treemap.new()
  |> Visualize.Layout.Treemap.size([400, 300])
  |> Visualize.Layout.Treemap.padding(2)

positioned = Visualize.Layout.Treemap.generate(treemap, root)

# Each node now has x0, y0, x1, y1 coordinates

Tiling Algorithms

• :squarify - Squarified treemap (default, good aspect ratios)
• :binary - Binary split (recursive halving)
• :slice - Horizontal slices
• :dice - Vertical slices
• :slice_dice - Alternating slice/dice by depth