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Windows Task Manager Style History Plot

, 24 Nov 2007 CPOL 21.9K 804 35
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Realtime plotting using Windows Task Manager style.

Screenshot - WinTaskManagerHistoryPlotLike.png


While working with a Process Control System, I needed to plot various output variables in real time. As Windows Task Manager History is very elegant to me, it has been my inspiration, and I added zooming capability and tooltips message to make it fancier.


I want to give credits to article authors for their articles I used to accomplish this work.

Using the Code

The main class GraphWnd is derived from CWnd so that it can have a standard MFC control signature.

class GraphWnd : public CWnd

You have to plan ahead how many parameters you want to plot and choose their colors on the plots by adding different colors from a predefined enum into a vector while being passed to a GraphWnd class construction.

enum eColor     {


GraphWnd(CRect rect,          //Plotting Control location

         CWnd* parent,        //parent control

         vector<ecolor> color)//color and number of parameters to be plotted

The parameters plotting is done through the UpdateGraphe method.

void UpdateGraphe(GraphData<double> data,
        double timeUnit, //the grid width in pixel on X axis

        double valueUnit,//the grid height in pixel on Y axis

        double minValue, //the minimum value expected on Y axis

        double maxValue, //the maximum value expected on Y axis

        string message)  //the tooltip message
  • The structure GraphData<t> data is used to handle the display of as many as parameters you wish.
  • template<T> struct GraphData
        std::vector<T> d;

    The plot axis are time axes as X axis and values axis as Y axis.

  • double timeUnit is the grid width in pixel on the X axis.
  • double valueUnit is the grid height in pixel on the Y axis.
  • double minValue is the minimum value expected on the Y axis.
  • double maxValue is the maximum value expected on the Y axis.
  • string message is a tooltip message.

That's all, folks. Please vote after using my article.


  • 25-11-2007
    • Original article.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Frederic Ntawiniga
Canada Canada
Just programming

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Comments and Discussions

GeneralMy vote of 1 Pin
jackbowman18-May-09 15:19
memberjackbowman18-May-09 15:19 
GeneralRight Margin Runoff Pin
Jeffrey Walton24-Nov-07 23:27
memberJeffrey Walton24-Nov-07 23:27 
GeneralRe: Right Margin Runoff Pin
Frederic Ntawiniga25-Nov-07 5:32
memberFrederic Ntawiniga25-Nov-07 5:32 

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