^{ITChart.OnZoom
ITChart}

<sup>property OnZoom: TNotifyEvent;

Type Library
TeeChartx

Description
An OnZoom event occurs whenever Chart contents is being zoomed.</sup>

^{Zoom can be performed by dragging the mouse at run-time or by calling the TChart.ZoomRect or TChart.ZoomPercent methods.}

^{This event gets called BEFORE the Chart class is repainted to show the new Axis scales.}

^{You can use this event together with TChart.OnUndoZoom and TChart.OnScroll events to know of changes on Axis scales.}