bargraph

Simple horizontal tree diagram using v4

A horizontal tree diagram shows hierarchical data with a top-level node branching into child nodes, with internal nodes labeled on the left and leaf nodes on the right. Built with d3.js v4, it uses the `d3.tree` layout and `d3.hierarchy` to compute node positions from a hard-coded JavaScript object. The SVG output renders circles for nodes, Bézier curve paths for links, and text labels styled via CSS. The code demonstrates standard d3 v4 tree-diagram APIs including `nodes.descendants()` and `node.append()`.

Simple vertical tree diagram using v4

A simple vertical tree diagram visualizes a small hierarchical dataset with three levels, showing parent-child relationships through curved links and labeled circular nodes. It uses d3.v4’s `d3.hierarchy` and `d3.tree` APIs to compute the layout from an inline JavaScript object. The SVG rendering is styled with CSS, with internal nodes distinguished by text shadows, and the code is intended as a starting point for upgrading examples in the book *D3 Tips and Tricks* to version 4.

Tree diagram using flat data with v4

This tree diagram visualizes hierarchical relationships from flat, parent-child data, rendering nodes and curved links in an SVG. It uses d3.stratify() to convert the flat data into a hierarchy, then applies the d3.tree() layout to position nodes. The code assigns node names via treeData.each(), draws paths for links with cubic Bézier curves, and styles circles and text for internal and leaf nodes. The example demonstrates d3 v4’s approach to handling non-nested data, with margins and dimensions set explicitly for the SVG output.

Simple horizontal tree diagram using v5

A simple horizontal tree diagram visualizes hierarchical data with three levels: a top-level root node, two second-level branches, and two leaf nodes. The code uses D3.js v5’s `d3.tree()`, `d3.hierarchy()`, and `d3.select()` APIs to compute the layout and render SVG paths for curved links and circles for nodes, with text labels positioned left or right based on whether a node has children. The diagram is defined by a static JavaScript object `treeData` and styled via CSS classes.

Simple horizontal tree diagram using v6

A simple horizontal tree diagram displays a small hierarchy of named nodes connected by curved links, with internal and leaf nodes distinguished by text alignment. Built with d3.js v6, it uses the `d3.tree()` layout and `d3.hierarchy()` to compute node positions from static, inline JSON data. SVG rendering places each node as a group containing a circle and label, while the links are drawn as cubic Bézier paths via the `d` attribute. The styling includes white node circles with steelblue strokes and gray links.

Hierarchy examples: Tree

This example demonstrates a node-link diagram for a small hierarchical dataset, showing both the original parent-child relationships and two manually added cross-links between a mid-level node and its grandchildren. The tree layout is computed using `d3.tree()` in D3 v6, and the visualization is rendered as an SVG with separate groups for nodes and links. Nodes appear as circles with text labels, while links are drawn as curved Bézier paths using a custom `crossDiagonal` function, which computes control points to create gentle arcs between connected nodes. The data is sourced from a static JavaScript object.

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d3.tree - A Family Tree

This example visualizes a family tree as a static hierarchical diagram, showing genealogical relationships with names, birth and death years, and locations. The graph uses the d3.tree layout to position nodes, while d3.hierarchy structures the JSON data and provides descendant and link methods. Links are drawn as elbow paths with a custom function, and each node displays three text elements for the relative information. The visualization is rendered in SVG with a clean, readable design, demonstrating how d3.v4 handles tree layouts and nested data.

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Tree diagram with styling in v4

This example shows a hierarchical tree diagram with styled nodes and links, where circles represent data objects using radius, stroke, and fill colors mapped from the source data. The layout is generated with d3.tree, while d3.hierarchy assigns the parent-child relationships from the inline JSON tree structure. The SVG rendering includes curved link paths between nodes, and node circles use values for radius plus type and level fields for stroke and fill styling. Text labels are positioned by horizontal anchor direction, which changes for internal versus leaf nodes.