ChartDirector 6.0 (ASP/COM/VB Edition)

Surface Chart (2)




This example extends the Surface Chart (1) example by adding surface grid and contour lines, and using alternative view angles and continuous coloring.

Source Code Listing

[Web Version (in ASP)] aspdemo\surface2.asp
<%@ language="vbscript" %>
<%
Set cd = CreateObject("ChartDirector.API")

' The x and y coordinates of the grid
dataX = Array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0)
dataY = Array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0)

' The values at the grid points. In this example, we will compute the values using the formula z =
' sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi)
ReDim dataZ((UBound(dataX) + 1) * (UBound(dataY) + 1) - 1)
For yIndex = 0 To UBound(dataY)
    y = (dataY(yIndex) - 0.5) * 2 * 3.1416
    For xIndex = 0 To UBound(dataX)
        x = (dataX(xIndex) - 0.5) * 2 * 3.1416
        dataZ(yIndex * (UBound(dataX) + 1) + xIndex) = Sin(x) * Sin(y)
    Next
Next

' Create a SurfaceChart object of size 720 x 540 pixels
Set c = cd.SurfaceChart(720, 540)

' Add a title to the chart using 20 points Times New Roman Italic font
Call c.addTitle("Quantum Wave Function", "timesi.ttf", 20)

' Set the center of the plot region at (360, 245), and set width x depth x height to 360 x 360 x 270
' pixels
Call c.setPlotRegion(360, 245, 360, 360, 270)

' Set the elevation and rotation angles to 20 and 30 degrees
Call c.setViewAngle(20, 30)

' Set the data to use to plot the chart
Call c.setData(dataX, dataY, dataZ)

' Spline interpolate data to a 80 x 80 grid for a smooth surface
Call c.setInterpolation(80, 80)

' Set surface grid lines to semi-transparent black (dd000000)
Call c.setSurfaceAxisGrid(&Hdd000000)

' Set contour lines to semi-transparent white (80ffffff)
Call c.setContourColor(&H80ffffff)

' Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the length
' to 200 pixels and the labels on the right side. Use smooth gradient coloring.
Call c.setColorAxis(645, 270, cd.Left, 200, cd.Right).setColorGradient()

' Set the x, y and z axis titles using 10 points Arial Bold font
Call c.xAxis().setTitle("x/L(x)", "arialbd.ttf", 10)
Call c.yAxis().setTitle("y/L(y)", "arialbd.ttf", 10)
Call c.zAxis().setTitle("Wave Function Amplitude", "arialbd.ttf", 10)

' Output the chart
Response.ContentType = "image/jpeg"
Response.BinaryWrite c.makeChart2(cd.JPG)
Response.End
%>

[Windows Version (in Visual Basic)] vbdemo\surface2.cls
Public Sub createChart(viewer As Object, chartIndex As Integer)

    Dim cd As New ChartDirector.API

    ' The x and y coordinates of the grid
    Dim dataX()
    dataX = Array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0)
    Dim dataY()
    dataY = Array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0)

    ' The values at the grid points. In this example, we will compute the values using the formula z
    ' = sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi)
    ReDim dataZ((UBound(dataX) + 1) * (UBound(dataY) + 1) - 1)
    Dim yIndex As Long
    For yIndex = 0 To UBound(dataY)
        Dim y As Double
        y = (dataY(yIndex) - 0.5) * 2 * 3.1416
        Dim xIndex As Long
        For xIndex = 0 To UBound(dataX)
            Dim x As Double
            x = (dataX(xIndex) - 0.5) * 2 * 3.1416
            dataZ(yIndex * (UBound(dataX) + 1) + xIndex) = Sin(x) * Sin(y)
        Next
    Next

    ' Create a SurfaceChart object of size 720 x 540 pixels
    Dim c As SurfaceChart
    Set c = cd.SurfaceChart(720, 540)

    ' Add a title to the chart using 20 points Times New Roman Italic font
    Call c.addTitle("Quantum Wave Function", "timesi.ttf", 20)

    ' Set the center of the plot region at (360, 245), and set width x depth x height to 360 x 360 x
    ' 270 pixels
    Call c.setPlotRegion(360, 245, 360, 360, 270)

    ' Set the elevation and rotation angles to 20 and 30 degrees
    Call c.setViewAngle(20, 30)

    ' Set the data to use to plot the chart
    Call c.setData(dataX, dataY, dataZ)

    ' Spline interpolate data to a 80 x 80 grid for a smooth surface
    Call c.setInterpolation(80, 80)

    ' Set surface grid lines to semi-transparent black (dd000000)
    Call c.setSurfaceAxisGrid(&Hdd000000)

    ' Set contour lines to semi-transparent white (80ffffff)
    Call c.setContourColor(&H80ffffff)

    ' Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the
    ' length to 200 pixels and the labels on the right side. Use smooth gradient coloring.
    Call c.setColorAxis(645, 270, cd.Left, 200, cd.Right).setColorGradient()

    ' Set the x, y and z axis titles using 10 points Arial Bold font
    Call c.xAxis().setTitle("x/L(x)", "arialbd.ttf", 10)
    Call c.yAxis().setTitle("y/L(y)", "arialbd.ttf", 10)
    Call c.zAxis().setTitle("Wave Function Amplitude", "arialbd.ttf", 10)

    ' Output the chart
    Set viewer.Picture = c.makePicture()

End Sub