Charts Zoom Pan

Zoom and pan let users focus on part of a dense chart — scroll to zoom, drag to pan, pinch on touch devices.

Turn it on per axis with ZoomConfig, constrain span with min_span, and optionally sync companion axes with filter_mode when the vertical axis should follow the visible horizontal range.

• Long time series where the default view is too dense to read.
• Exploration dashboards where users drill into a date range before taking action.
• Line and bar charts with ChartFeatures::ZOOM_PAN enabled on the chart root.

• Set zoom config on the axis definition (enabled: true, optional min_span).
• Enable features=ChartFeatures::ZOOM_PAN on the chart component.
• Hold zoom state in an RwSignal<Vec<ZoomWindow>> for controlled mode and reset buttons.
• Wire on_zoom_change when parent state must persist across re-renders.