SVG vs Canvas for Interactive Maps
When SVG's DOM-based interactivity beats Canvas for map rendering, and when it doesn't.
Interactivity vs Raw Performance
SVG renders each map region as a DOM element, making individual regions easy to style, hover, and click. Canvas draws to a bitmap with no per-shape DOM nodes, scaling better for very large datasets but requiring manual hit-testing for interactivity.
- SVG: easy per-region styling and click handlers
- Canvas: better raw performance at huge scale
- SVG suits choropleths; Canvas suits dense point data
Choosing for Your Map
Use SVG for region-based maps (countries, states) with moderate region counts needing rich interactivity. Use Canvas when rendering thousands of individual points or highly dynamic, frequently redrawn map layers.
- Region/choropleth maps → SVG
- Thousands of points, heavy redraws → Canvas
- Hybrid approaches combine both where needed
Frequently Asked Questions
Why do SVG maps slow down with thousands of regions?
Each SVG region is a DOM node, and the browser must manage style and event handling for every one, which becomes costly at very high element counts.
Can Canvas maps support hover tooltips like SVG?
Yes, but you must manually calculate which shape the cursor is over since Canvas has no built-in per-shape hit-testing like SVG's DOM elements.
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