The rectangle enclosing the shown data range is called the LogicalExtent
of the Chart. Therefore, store the LogicalExtent before performing a
zoom in a TDoubleRect (savedExtent := Chart.LogicalExtent), and to go
back you just assign it the other way: Chart.LogicalExtent := savedExtent.
(The unzoomed extent already is available as "Chart.GetFullExtent").
All this is managed by the TChartExtentHistory. Details are explained in
the Mandelbrot-Tutorial
(http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming#Zoom_history).
Am 04.06.2015 um 21:35 schrieb Richard Mace:
Hi,
Another quick question. How can you, via code, zoom out of a chart,
effectively back to what it was by default? If that makes sense?
Thanks
Richard
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