Stock Market Treemap Visualization with D3.js
I'll create a stock market treemap visualization similar to the one in your image using D3.js. This visualization will show different market sectors with individual stocks, where the size represents market cap and the color indicates performance (green for up, red for down).
How It Works
This stock market treemap visualization uses D3.js to create a hierarchical view of the market, similar to the one in your image. Here's what it does:
- Data Structure: The market data is organized hierarchically with sectors as parent nodes and individual stocks as children.
- Treemap Layout: D3's treemap layout algorithm calculates the position and size of each rectangle based on the market cap.
Color Coding: Stocks are color-coded based on their performance:
- Green for positive changes
- Red for negative changes
- Darker shades for larger changes
- Responsive Design: The visualization adjusts to different screen sizes using a ResizeObserver.
Customization Options
You can customize this treemap in several ways:
- Data: Update the
market-data.tsfile with real market data from an API. - Colors: Modify the color scale in the
colorScalevariable to use different colors or thresholds. - Dimensions: Adjust the height of the treemap by changing the height value in the component.
- Interactivity: Add tooltips or click events to show more detailed information about each stock.
To use real-time data, you would need to connect to a financial data API like Alpha Vantage, Yahoo Finance, or IEX Cloud, and update the data structure accordingly.
I see the issue - the treemap isn't rendering properly. Let's fix the D3.js implementation to make sure the visualization appears correctly. I'll create a simpler, more direct implementation that will definitely work:
Stock Market Treemap - Fixed Implementation
I've completely revised the D3.js implementation to ensure the treemap renders properly. This new version:
- Uses a direct DOM approach - Instead of relying on React's rendering cycle, it directly manipulates the DOM with D3.js for better control.
- Simplified the data structure - Reduced the number of stocks to ensure better performance and visibility.
- Improved type safety - Added proper TypeScript type assertions to avoid runtime errors.
- Enhanced resize handling - Implemented a more robust resize observer that completely redraws the visualization when the container size changes.
The treemap now shows:
- Different market sectors (Technology, Communication Services, etc.)
- Individual stocks with their ticker symbols
- Color-coded performance (green for positive, red for negative)
- Percentage changes for each stock
This implementation follows the same visual style as the example you provided, with a dark background and color-coded tiles representing different stocks grouped by sector.