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  Add tooltip to zones
Posted by Florian Seywert on Apr-24-2014 20:39
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Hi,

I would like to add toolTips to "zone" included in my graph. How can I do that?
If the solution is to add manually a line in the HTMLImageMap for each zone, can I have an example because I already try this solution without success ?

Thank you in advance,
Best regards,

  Re: Add tooltip to zones
Posted by Florian Seywert on Apr-24-2014 20:41
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I forgot to specify that I use XYChart in C++ MFC.

  Re: Add tooltip to zones
Posted by Peter Kwan on Apr-25-2014 03:03
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Hi Florian,

By "zones", I assume you are referring to a rectangular region in the chart. In this case,
the image map is like:

const char *imageMap = "<area shape='rect' coords='80,100,400,300' title='my tooltip'>";

In the above, (80,100) and (400,300) are the (x, y) pixel coordinates of the opposite
corners of the rectangular region.

Suppose your "zone" is a y-axis zone from y=40 to y=80. The code is like:

//First, create and display the chart (pass the chart to the CChartViewer). After
displaying the chart:

int leftXCoor = c->getPlotArea()->getLeftX();
int topYCoor = c->getYCoor(80);
int rightXCoor = c->getPlotArea()->getRightX();
int bottomYCoor = c->getYCoor(40);

char imageMap[1024];
sprintf(imageMap, "<area shape='rect' coords='%d,%d,%d,%d' title='my tooltip'>",
leftXCoor, topYCoor, rightXCoor, bottomYCoor);

If you have multiple image map regions, you may append the <area> tags together into a
long string.

After creating the complete image map (by appending all the regions together), you may
pass it to the CChartViewer using CChartViewer::setImageMap.

Hope this can help.

Regards
Peter Kwan

  Re: Add tooltip to zones
Posted by Florian Seywert on Apr-25-2014 21:22
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Hi,
Thanks for your answer. I already tried this solution without success but I just see that I forgot to close the line I added with ">". Now it works as expected.
But I wondered if an ImageMap could be generated with "getHTMLImageMap" for the struct Zone (as it is defined for "c->xAxis()->addZone") ?

Thank you in advance,

  Re: Add tooltip to zones
Posted by Peter Kwan on Apr-26-2014 00:26
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Hi Florian,

Unluckily, the addZone method does not return anything (the return type is declared as
"void" in C++), so there is no "struct Zone" or object that you can call getHTMLImageMap
on.

Regards
Peter Kwan