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Posted 14 Jun 2003

Using the MS Chart control in VC++

, 14 Jun 2003
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Setting data and labels on the MS Chart control using VC++
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The following is the description for using the MS Chart control in VC++. The diagram below will give you an idea of the chart we are going to make.

First insert the chart control in your project using Project->Add Reference->Microsoft Chart Control. Next is populating the chart control. When I was working with Visual Basic I had used a data source to pass data to the chart. But in VC++ ,I did not get the datasource method in the initial tries. So I passed the chart data through a COleSafeArray. Thanks to J L Colson for illuminating the details in his article on code project.

Here is the code snippet for that. <PRE lang=c++>//First create a safe array COleSafeArray saRet; SAFEARRAYBOUND sab[2]; sab[0].cElements =noOfRows; // give this exactly the number of rows you display in your chart sab[1].cElements = 5; // number of columns + 1 (because the first // column is where we put the row labels, // ie in 1.1, 2.1, 3.1, 4,1 etc sab[0].lLbound = sab[1].lLbound = 1; // Use the chart as the backdrop of the legend. m_ChartControl.SetShowLegend(TRUE); // Create the safe-array... saRet.Create(VT_BSTR, 2, sab); long index[2] = { 0, 0 }; //a 2D graph needs a 2D array as index array BSTR bstr; index[0] = 1; FILEDETAILS filedetailsstruct; // this is just a datastructure I used, // pls see attached code CString cstemp; // m_filedetails is an STL list of filedetailsstruct // in this loop we populate the safe array for (i = m_filedetails.begin(); i != m_filedetails.end(); i++) { filedetailsstruct = (FILEDETAILS *) i; index[1] = 1; // make sure this cannot be converted to a valid number like "54" and // is a valid string like "John" bstr = filedetailsstruct.login.AllocSysString(); // Row label saRet.PutElement(index, bstr); index[1] = 2; bstr = filedetailsstruct.n9000.AllocSysString(); // Data for column 1 ::SysFreeString(bstr); saRet.PutElement(index, bstr); index[1] = 3; bstr = filedetailsstruct.n9002.AllocSysString(); // Data for column 2 ::SysFreeString(bstr); saRet.PutElement(index, bstr); index[1] = 4; bstr = filedetailsstruct.n9004.AllocSysString(); // Data for column 3 ::SysFreeString(bstr); saRet.PutElement(index, bstr); index[1] = 5; bstr = filedetailsstruct.nCancel.AllocSysString();// Data for column 4 ::SysFreeString(bstr); saRet.PutElement(index, bstr); index[0]++; } //now hand over the safe array to the chart control m_ChartControl.SetChartData(saRet.Detach());

Our chart data will look like this:

2,1  2,2  2,3  2,4  2,5
1,1  1,2  1,3  1,4  1,5

where 1,1 - Row label 1 2,1 - Row Label 2

Okay now to label the columns: <PRE lang=c++>m_ChartControl.SetColumnLabelCount(4); m_ChartControl.SetColumn(1); m_ChartControl.SetColumnLabel("Monday"); m_ChartControl.SetColumn(2); m_ChartControl.SetColumnLabel("Wednesday"); m_ChartControl.SetColumn(3); m_ChartControl.SetColumnLabel("Friday"); m_ChartControl.SetColumn(4); m_ChartControl.SetColumnLabel("Saturday");

Thats it folks.



Developed On Windows 2000 Server using VC++ ver 6


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About the Author

Alex C. Punnen
India India
Hi everyone!! Sometimes I get real stumped with some concepts and that gets me excited.So I say - hey let me explore - and there I go!! .Currently I am working as software engineer for Nokia Siemens Networks, Bangalore -India.My dream subject - Physics!!

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GeneralMore sample Pin
Ankata10-Jun-09 14:04
memberAnkata10-Jun-09 14:04 

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