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 how can i get already set chart from chartviewer? |
| Posted by jay on Jul-21-2017 09:25 |
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this question is related to my previous question below.
(http://www.chartdir.com/forum/download_thread.php?site=chartdir&bn=chartdir_support&thread=1500506530)
i made a Simple XYChart then set title, add layer and data.
after ChartViewer.setChart(), my XYChart displayed well and I released my XYChart (delete XYChart)
my problem starts here.
if i want to chage the title of chart or add a line data in current chart, how can i do that?
after ChartViewer.setChart(), i tried to not delete my XYChart.
I changed title, and added linedata to my XYChart.
then I ChartViewer.setChart() again, but chart viewer changes nothing.
this makes me crazy. please help me.
how can i solve my problem? |
| Re: how can i get already set chart from chartviewer? |
| Posted by Peter Kwan on Jul-22-2017 00:05 |
|
Hi Jay,
You can change anything you like in the chart by just drawing another chart.
For example, if you want to change the chart title, the code is like:
std::string myChartTitle = "ABC";
void drawChart()
{
XYChart *c = new XYChart(....);
c->addTitle(myChartTitle.c_str());
......
m_ChartViewer.setChart(c);
delete c;
}
When the user changes the chart title, you can use:
myChartTitle = "... new title...";
drawChart();
The above method is simple and easy to implement. Basically, you just need to use variables for anything thing you want to change.
For your reference, there is a sample code "Interactive Financial Chart" in which a lot of things can be modified by the user. It is implemented using the above method. You can try it to see how smooth it works.
http://www.advsofteng.com/doc/cdcpp.htm#financedemo.htm
Hope this can help.
Regards
Peter Kwan |
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