ZoomDragTool question regarding AdjustSelection
lazarus / 55-TAChart

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Muso · 2021-08-02 00:26

The ZoomDragTool has the property "AdjustSelection" which is by
default on. What does this do, meaning what would be the effect when
it is turned off?

I googled around and cannot find any info about this. There is also no
XML info in the IDE.

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wp · 2021-08-02 15:24

In some special cases users want to zoom only into y or x directions,
i.e. want to keep x or y fixed, as shown in the chart. This is
achieved by the RatioLimit property (zrlFixedX, zrlFixedY).
AdjustSelection=true gives a visual feedback by drawing the zoom
rectangle across the entire chart for the restricted coordinate.

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Muso · 2021-08-02 17:59

Quote from: wp on August 02, 2021, 05:24:57 pmIn some special cases
users want to zoom only into y or x directions, i.e. want to keep x or
y fixed, as shown in the chart. This is achieved by the RatioLimit
property (zrlFixedX, zrlFixedY). AdjustSelection=true gives a visual
feedback by drawing the zoom rectangle across the entire chart for the
restricted coordinate.

Cool feature!

TAChart has so many cool features one is not aware of as new Lazarus
user and the XML info is at least for me a good starting point where
to look in the docs. E.g. if there is already a tutorial in which the
feature is used.
I know your spare time is limited, but when you could put it onto your
ToDo list to add some XML info for AdjustSelection and also RatioLimit
would be nice.