Windows Forms TreeMap Overview

8 Jul 20261 minute to read

Introduction

Tree maps are ideal for visualizing large amounts of data. The space in the visualization is split up into rectangles that are sized and colored based on the quantitative variables. The levels in the hierarchy of the TreeMap are visualized as rectangles containing other rectangles.

Key Features

  • Layouts — Supports different layout types such as squarified and slice-and-dice for arranging leaf nodes.
  • Data Binding — Binds to collections of business objects with support for hierarchical data.
  • Weight Value Path — Binds the size of each rectangle to a specified property.
  • Color Mapping — Applies colors to nodes based on underlying values.
  • Headers and Labels — Customizes header text and node labels.
  • Levels — Displays hierarchical data through multiple levels of nested rectangles.
  • Leaf Item Settings — Controls the appearance of leaf nodes.
  • Legend — Displays a legend describing the color palette used in the TreeMap.
  • ToolTip Support — Shows tooltips on hover for additional node information.

Use Cases

Tree maps are used to represent large or complex data sets in various applications, such as:

  1. Stock market analysis, where the weight of each stock in the index is represented by the size of the rectangle, and its range of loss or gain is represented by the color of the rectangle.
  2. Visualizing Internet usage across various categories, where the size of each rectangle represents the number of active users in segments such as retail, social networks, and search engines.
  3. Categorizing news aggregated by Google News, where the colors represent different sections (such as business or politics), and the size of the boxes represents how many similar stories appear.
  4. Indicating weather report analysis around the world, where the opacity of each rectangle can differ based on its humidity.