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 How to Add a Track Point to the Last Point of a Real-Time Chart? |
| Posted by Fabio on Dec-31-2015 01:57 |
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Hello,
I need to add a track point (highlight) to the last point of a real-time XY scatter chart. About every second a new point is added to the chart, and I want to highlight each time just that last point with a bigger (more pixels) circle symbol, for example. How can I do that, if possible?
I adapted the Qt example xyzoomscroll, and made it real-time with one line layer. I am using ChartDirector 6.0 with Qt C++ 5.5 on both Windows 7 and desktop Linux (K)Ubuntu 15.
Thanks in advance,
Fabio |
| Re: How to Add a Track Point to the Last Point of a Real-Time Chart? |
| Posted by Peter Kwan on Jan-01-2016 01:20 |
|
Hi Fabio,
Just add another scatter layer with just one point, which is the point you want to highlight.
The point can be using a special color, shape, or use a big hollow circle to enclose the
existing point. A hollow circle symbol can be achieved by using the circle symbol with a
transparent fill color and non-transparent border color, and the border can be set to a
thicker line width. For example:
ScatterLayer *specialLayer = c->addScatterLayer(DoubleArray(&lastXCoor, 1),
DoubleArray(&lastYCoor, 1));
specialLayer->getDataSet(0)->setDataSymbol(Chart::CircleSymbol, 19, Chart::Transparent,
0xff0000, 4);
Hope this can help.
Regards
Peter Kwan |
| Re: How to Add a Track Point to the Last Point of a Real-Time Chart? |
| Posted by Fabio on Jan-05-2016 01:12 |
|
Hi Peter,
I just copied the sample code to my application, and it worked as expected highlighting the last point of the series.
You may consider this question/issue as answered/resolved.
Again, many thanks,
Fabio |
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