Responsive SVG Charts
SVG charts can scale via viewBox or re-render with recalculated scales, and the right choice depends on text legibility.
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viewBox Scaling vs Re-Rendering
Setting a viewBox and letting the SVG scale to its container is the simplest approach, but it scales text and stroke widths proportionally too, which can make labels illegibly small on narrow screens, whereas re-rendering with recalculated scales keeps text at a fixed readable size.
- viewBox scaling is simplest but shrinks text and strokes proportionally
- Proportionally shrunk labels become illegible on narrow screens
- Re-rendering with new scales keeps text at a fixed readable size
Adapting Chart Density to Available Width
Beyond geometry, a genuinely responsive chart often needs to reduce tick count, shorten or rotate axis labels, and sometimes simplify the chart entirely at narrow widths, since a layout that works at desktop width rarely remains readable when compressed to a phone screen.
- Reducing tick count prevents axis labels from colliding at narrow widths
- Shortening or rotating labels recovers horizontal space
- Some charts need genuine simplification rather than just rescaling
Frequently Asked Questions
Why do my chart labels become unreadable when the SVG scales down?
viewBox scaling shrinks text proportionally along with everything else, so on narrow screens labels can drop below a legible size — re-rendering with fixed text size avoids this.
What else besides size should change on a narrow screen?
Tick count usually needs reducing to prevent label collisions, and axis labels often need shortening or rotating to fit the reduced horizontal space.
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