ecGraph Demos

 

 


ecGraph Demo16.   Area Plot


  • Area Plot
  • Showing three data series of random points

 

 

The VB code used to generate the above graph... 

Public Sub Demo16(ecGraph1 As ecGraph)
  'Area Plot 
  Dim i As Integer, X1(10) As Double, Y1(10) As Double, Y2(10) As Double, Y3(10) As Double
  
  'Prepare 3 data sets. Y3=top, Y2=middle, Y1=lower
  For i = 0 To 10
    X1(i) = i
    Y1(i) = 1 + i - (i * i) / 10 - 2 * Rnd
    Y2(i) = Y1(i) + 0.5 + 2 * Rnd
    Y3(i) = Y2(i) + 0.5 + 2 * Rnd
  Next i
    
  With ecGraph1
    Call .Reset 'Always call "Reset" first to clear the page
    
    'Start a new graph on the page..
    Call .NewGraph("Area Plot")

    'Start a new data set on the graph, plot Top set first..
    Call .NewDataSet("Area Plot 1")
    Call .SymbolStyle(0, 2, vbCyan, ecGray) 'no symbol, fill color is used to fill the area plot
    Call .DataLine(ecGray, 1, 4) 'Style: 4=area plot, gray border
    For i = 0 To 10
      Call .AddDataPoint(X1(i), Y3(i))
    Next i
    
    'Second data set for this graph, plot Middle set..
    Call .NewDataSet("Area Plot 2")
    Call .SymbolStyle(0, 2, vbYellow, ecGray) 'no symbol
    Call .DataLine(ecGray, 1, 4) 'Style: 4=area plot, gray border 
    For i = 0 To 10
      Call .AddDataPoint(X1(i), Y2(i))
    Next i
    
    'Third data set for this graph, plot Lower set last..
    Call .NewDataSet("Area 3 (vert lines)")
    Call .SymbolStyle(0, 2, vbGreen, ecGray) 'no symbol
    Call .DataLine(ecGray, 1, 5) 'Style: 5=area plot with vertical lines, gray border 
    For i = 0 To 10
      Call .AddDataPoint(X1(i), Y1(i))
    Next i
    
    Call .Refresh 'Always end with "Refresh"
  End With
End Sub 


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