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```