Steema Central

Any chance for the availability of a TextBox tool, "similar" to the DrawLine tool?

Hi Wiebe,

I don't understand what exactly do you mean. Could you please be more specific?

Thanks in advance.

A tool that enables you, after a click somewhere in a chart, to draw some text in a box. Text and box to be definable "on the fly".
We are aware, and we tried ourselves in the past but ran into problems while zooming, that such a thing could be developed on the basis of an Annotation. But your guys are much smarter on that anyhow.

Wiebe

Narcis,

Could you comment?

Thanks in advance
Wiebe

Hi.

I guess this can already be done (quite easily) with the annotation tool. But as you noticed, if you zoom in/out or stretch chart image, annotation position will not change. This is "normal" as all custom positioned chart objects are defined in screen pixel coordinates.
In your case the best solution is to derive new TAnnotationToolEnh from existing annotation tool and add couple of properties defining tool left-top position, but expressed in axis (real) values. These properties will be set when tool is created and will store (real) axis coordinates. Then you can use these coordinates to actually paint annotation tool at specific x-y coordinate. The big advantage of this approach is if you zoom or scroll, tool screen position will be recalculated from stored (real) axis values and tool screen position will also change if needed.

Thanks Marjan,

We'll have a look into it via that way.
OTOH consider to add a Textbox to your tools pallete in TChart V8.

Wiebe

Allright we succeeded.
We derived a TextBox from TAnnotation with addtional x, y properties, expressed in (real) axis coordinates, and a TChartSeries property enabling coordinate conversion to be performed internally.

Wiebe

Hi Wiebe,

could you please send me some information how you did this? I need something similar in our project.

Thx !!