Select Points in teeChart?

leaf · Post by **leaf** » Tue Feb 22, 2005 7:45 pm

Hi,

I have several series in teeChart. I'd like the user to draw a rect bound to select all the points fall into that bound. Is there any easy way I can do that?

Thanks.

Stanley

Marjan · Post by **Marjan** » Wed Feb 23, 2005 6:56 am

Hi, Stanley.

Let's say you already defined the bounding rectangle: either by using chart OnMouseDown, onMouseMove and OnMouseUp events or by other methods. Now you have to cycle through all series points and if specific point is in defined bounding rectangle (you can use PtInRect method to test this), add series index and point index to the list of highligted points. Finally, you can use this information to change the color of selected points or alternatively, use series OnGetPointerStyle event to change the style of specific series points.

leaf · Post by **leaf** » Wed Feb 23, 2005 9:27 pm

Thanks for the tips. It works.

leaf · Post by **leaf** » Thu Feb 24, 2005 7:29 pm

It's almost working.

I have the rect from moue down/up. I have the points in series. But I cann't convert the x, y to screen coordiates.

Please advise.

Thanks.

beetle · Post by **beetle** » Thu Feb 24, 2005 7:36 pm

Hi, try using 'CalcXPosValue' and 'CalcYPosValue' methods of TChartSeries

leaf · Post by **leaf** » Thu Feb 24, 2005 7:57 pm

Yes, I found the same function. Life is good again.

Select Points in teeChart?

Select Points in teeChart?

It works

Coordiates Conversion

Yes, got it