ChartDirector 6.0 (ASP/COM/VB Edition)

Surface Perspective


          

This example demonstrates the effects of various perspective depth, configured using ThreeDChart.setPerspective.

Source Code Listing

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

' This script can draw different charts depending on the chartIndex
chartIndex = CInt(Request("img"))

' 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

' the perspective level
perspective = chartIndex * 12

' Create a SurfaceChart object of size 360 x 360 pixels, with white (ffffff) background and grey
' (888888) border.
Set c = cd.SurfaceChart(360, 360, &Hffffff, &H888888)

' Set the perspective level
Call c.setPerspective(perspective)
Call c.addTitle("Perspective = " & perspective)

' Set the center of the plot region at (195, 165), and set width x depth x height to 200 x 200 x 150
' pixels
Call c.setPlotRegion(195, 165, 200, 200, 150)

' Set the plot region wall thichness to 5 pixels
Call c.setWallThickness(5)

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

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

' Spline interpolate data to a 40 x 40 grid for a smooth surface
Call c.setInterpolation(40, 40)

' Use smooth gradient coloring.
Call c.colorAxis().setColorGradient()

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

[Windows Version (in Visual Basic)] vbdemo\surfaceperspective.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

    ' the perspective level
    Dim perspective As Long
    perspective = chartIndex * 12

    ' Create a SurfaceChart object of size 360 x 360 pixels, with white (ffffff) background and grey
    ' (888888) border.
    Dim c As SurfaceChart
    Set c = cd.SurfaceChart(360, 360, &Hffffff, &H888888)

    ' Set the perspective level
    Call c.setPerspective(perspective)
    Call c.addTitle("Perspective = " & perspective)

    ' Set the center of the plot region at (195, 165), and set width x depth x height to 200 x 200 x
    ' 150 pixels
    Call c.setPlotRegion(195, 165, 200, 200, 150)

    ' Set the plot region wall thichness to 5 pixels
    Call c.setWallThickness(5)

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

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

    ' Spline interpolate data to a 40 x 40 grid for a smooth surface
    Call c.setInterpolation(40, 40)

    ' Use smooth gradient coloring.
    Call c.colorAxis().setColorGradient()

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

End Sub