Fix: keep line visible when zooming between data points #12176
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When zooming into a range with no visible data points, the line controller skipped rendering entirely. This change includes boundary points before and after the visible range so line segments crossing the viewport are still drawn. Fixes chartjs#12174
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Pull request overview
This pull request fixes a bug where line charts disappear when zooming into regions between widely spaced data points. The issue occurred because the line controller only rendered points strictly inside the visible range, causing line segments that cross the viewport to not be drawn.
Changes:
- Added
_includeBoundaryPointsmethod to find and include the nearest data points before and after the visible range - Modified the
updatemethod to call_includeBoundaryPointsbefore setting draw start and count - Moved the assignment of
_drawStartand_drawCountto after the boundary point inclusion
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Co-authored-by: Copilot <[email protected]>
Co-authored-by: Copilot <[email protected]>
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Fixes #12174
Problem
When zooming into a range that contains no data points
(between widely spaced points), the line chart disappears
even though the connecting line segment should be visible.
Cause
The line controller only rendered points strictly inside
the visible scale range. When zero points were visible,
no line segments were drawn.
Solution
Include the nearest boundary points (before and after the
visible range) when computing the draw window so line
segments crossing the viewport are rendered correctly.
Verification
sparse regions with zero visible points