Question 1

How to make a zoomable map with Spam?

Accepted Answer

Use the zoomable map example from the documentation, which involves setting up dynamic painting phases for interactive zoom. It requires defining callbacks for static and dynamic layers to handle repaints efficiently.

Question 2

Spam vs Leaflet for interactive maps?

Accepted Answer

Spam is better for custom, performance-focused Canvas rendering with D3 integration, while Leaflet offers more out-of-the-box features like tile layers and UI controls but can be heavier and less flexible for bespoke visualizations.

Question 3

Can Spam handle real-time data updates?

Accepted Answer

Yes, by leveraging the dynamic painting phase to redraw elements based on updated data. However, performance depends on optimizing static content to minimize repaint overhead, as advised in the README.

Question 4

How to add click events to map features?

Accepted Answer

Define interactive event callbacks in the dynamic painting phase, as shown in the examples. The API supports click and hover events by mapping canvas coordinates to geographic features using D3's projection system.

Question 5

Does Spam support custom map projections?

Accepted Answer

Yes, it integrates with D3's projection system, allowing custom projections like azimuthal or conic. The custom projection example demonstrates how to override the default projection settings.

Question 6

What are the browser compatibility requirements?

Accepted Answer

Spam relies on HTML5 Canvas and D3, so it supports modern browsers with Canvas API. Older browsers may need polyfills, and performance can vary on devices with limited GPU acceleration.

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