Zoom on Selected Chart Area

VCL TMS VCL Chart
1

I am currently using Delphi XE7 Update 1 with an updated version of TMS components.

I am wondering whether there is a way to zoom in on a chart area that is selected by the mouse?  I have currently only found the zoom feature using the built-in navigation bar.

Ideally, I would like the user to be able to click and select an area of the chart and then zoom in on that area.

2

Hi, 


Yes this is possible. You should be able
to use this feature by holding CTRL key on the keyboard, <o:p></o:p>

clicking with the left mouse button and dragging the area you want to zoom. The zooming occurs when releasing the left mouse button.


Kind Regards, 

Pieter

3

This is good to know, I was just in the process of writing such a function.

However, with your implementation, it only seems to zoom in the x direction. If I draw the box around somewhere in the upper part of the trace, the x directions zooms to my selection, but the y always includes the fully normalized range of the data. Is this as designed, or am I missing a setting somewhere?

4

Hi, 


if you specified to use arDisabled then the zooming will not work in y direction.
You need to specify another range type to support this as well.

Kind Regards, 
Pieter
5

I just found the CtrlZooming property - setting this to czBoth fixes the issue.

This is going to save me a lot of headaches. Thanks.

6

mmm - where did you find the CtrlZooming property, certainly not in the manual? I can't find it

7

The CTRLZooming property is available on panes level:


AdvChartView1.Panes[0].CtrlZooming

Kind Regards, 
Pieter