Tooltips Showcase

Explore the power and versatility of the Velo Plot's new tooltip system. This demo showcases different themes, templates, and interaction modes.

📊 0 points 🚀 0 FPS

Hover to see tooltips • Scroll to zoom • Drag to pan

Interactive Features

1. Data Point Snap

Hover near any data point to see the "Snap" behavior. The tooltip automatically finds the nearest data point and anchors itself with a smooth arrow.

2. Multi-Series Crosshair

Toggle the Crosshair Mode in the demo to see how the engine can interpolate values across multiple series simultaneously at a single vertical position.

3. Glassmorphism & Themes

Built-in themes include:

• Dark/Light: Classic professional look.
• Glass: Translucent background with hardware-accelerated backdrop blur.
• Electrochemistry: Optimized for scientific workstations.
• Neon: Deep blacks and high-vibrancy glow.

4. Heatmap Integration

Move your cursor over the heatmap demo below to see cell-specific Z-values and automatic color-scale matching.

Customization Example

You can easily register custom templates to match your application's branding or data requirements.

chart.tooltip.registerTemplate('simple', {
  id: 'simple',
  supportedTypes: ['datapoint'],
  measure: (ctx, data, theme) => ({ width: 80, height: 25, padding: theme.padding }),
  render: (ctx, data, pos, theme) => {
    ctx.fillStyle = theme.backgroundColor;
    ctx.fillText(`${data.dataY.toFixed(2)}`, pos.x, pos.y);
  }
});

Performance

The tooltip system is optimized for high-performance charts:

• Canvas-based Rendering: Avoids DOM overhead when displaying frequent updates.
• Binary Search Hit-Testing: Even with millions of points, finding the nearest point takes logarithmic time.
• Measurement Caching: Computed layouts are cached to reduce expensive measureText calls.