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Environment: VC6 SP3, NT4 SP3
This ActiveX control is intended to display a distribution graph of numerical datas.
The datas are split among a set of constant intervals. The horizontal axis displays the
interval values. The vertical axis shows the number of occurences (percentage) of
numerical datas in each interval.
Each data is combined with a date. When the user clicks on one of the vertical bars, a
small windows displays all the couples (value,date) bounded be the interval.
The user of the control is allowed to specify :
- either the interval value either the number of intervals (these two values are related),
- a display unit (unity, thousand or million),
- the background color,
- the vertical bars color
There is little chance this control meets your need. But it can help you if you have
something similar to do.
The source project contains two ATL objects :
- the control itself (CDistributionGraph)
- a simple ATL object used to store historical datas (CHistoricalDatas)
HistoricalDatas contains the following methods and properties :
| AddEntry( DATE date, double value) | Add a couple (date,value) in the historic |
| long Length | Return number of datas |
| double Value(long index ) | Get value at specified index |
| DATE Date(long index ) | Get date at specified index |
DistributionGraph contains the following methods and properties :
| HistoricalDatas | Set/Get the historical datas |
| double Interval | Set/Get the interval value |
| long IntervalCount | Set/Get the number of intervals |
| Units DisplayUnits | Set/Get the display unit (One,Thousand or Million) |
The two demo project (VB and VC++) show how to populate the control. The VC++ project
contains two wrapper classes (CHistoricalDatas and CDistributionGraph) which have been
generated by ClassWizard using Project|Add to Project|Components and control
Sample Visual Basic code
Dim hDatas As New HistoricalDatas
Dim d As Date
Dim v As Double
d = Date
For i = 0 To 200
v = Rnd(1) * 10000
hDatas.AddEntry DateAdd("d", i, d), v
Next i
DistributionGraph.HistoricalDatas = hDatas
Sample VC++ code
fHistoricalDatas.CreateDispatch("DGraph.HistoricalDatas.1") ;
COleDateTime date = COleDateTime::GetCurrentTime(); ;
const COleDateTimeSpan oneDay( 1, 0, 0, 0 ) ;
for ( int i = 0 ; i < 200 ; i++ )
{
fHistoricalDatas.AddEntry( date, (10000*::rand())/RAND_MAX ) ;
date += oneDay ;
}
fGraph.SetFillColor( RGB( 255, 0, 0 ) ) ;
fGraph.SetBackColor( ::GetSysColor( COLOR_WINDOW ) ) ;
fGraph.SetHistoricalDatas( fHistoricalDatas ) ;
fGraph.SetDisplayUnits( 0 ) ;
Downloads
Download Visual Basic demo project - 7 Kb
Download Visual C++ demo project - 17 Kb
Download source - 59 Kb
Note : Before executing demo projects, the ActiveX control
must first be registered (compile it or use regsvr32).
