ChartDirector 7.0 (ASP/COM/VB Edition)

Scattered Data Contour Chart




This example demonstrates using scattered data to create a ContourLayer.

In the previous Contour Chart example, the data points lie on a grid. ChartDirector also supports using scattered data points, which means the data points can be at irregular positions. To distinguish between the two case, if the number of z coordinates is equal to the product of the number of x and y coordinates, ChartDirector will assume the x and y coordinates define the grid and the z coordinates are values of the points on the grid. If the number of x, y and z coordinates are equal, ChartDirector will assume they represent scatter points.

In this example, in additional to a ContourLayer added using XYChart.addContourLayer, there is also a ScatterLayer added using XYChart.addScatterLayer to show the positions of the data points.

Source Code Listing

[Web Version (in ASP)] aspdemo\scattercontour.asp
<%@ language="vbscript" %> <% Set cd = CreateObject("ChartDirector.API") ' The (x, y, z) coordinates of the scattered data dataX = Array(0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9, 1.9, 4.8, 2.4, 3.4, 7.9, _ 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4, 2.9, 8.9, 0.9, 8.9, 10.0, 1.0, 6.8, 3.8, 9.0, _ 5.3, 6.4, 4.9, 4.5, 2.0, 5.4, 0.0, 10.0, 3.9, 5.4, 5.9, 5.8, 0.3, 4.4, 8.3) dataY = Array(3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8, 4.3, 1.3, 2.3, 5.4, 6.9, _ 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0, 2.9, 2.4, 3.9, 2.9, 2.3, 9.3, 2.0, 3.4, 4.8, 2.3, _ 3.4, 2.3, 1.5, 7.8, 4.5, 0.9, 6.3, 2.4, 6.9, 2.8, 1.3, 2.9, 6.4, 6.3) dataZ = Array(6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7, 8.4, 7.8, 8.0, 9.4, 11.9, _ 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6, 9.7, 10.6, 9.2, 7.0, 6.9, 9.7, 8.6, 8.0, 13.6, _ 13.2, 5.9, 9.0, 3.2, 8.3, 9.7, 8.2, 6.1, 8.7, 5.6, 14.9, 9.8, 9.3, 5.1, 10.8, 9.8) ' Create a XYChart object of size 450 x 540 pixels Set c = cd.XYChart(450, 540) ' Add a title to the chart using 15 points Arial Italic font Call c.addTitle(" Contour Chart with Scattered Data", "Arial Italic", 15) ' Set the plotarea at (65, 40) and of size 360 x 360 pixels. Use semi-transparent black (c0000000) ' for both horizontal and vertical grid lines Call c.setPlotArea(65, 40, 360, 360, -1, -1, -1, &Hc0000000, -1) ' Set x-axis and y-axis title using 12 points Arial Bold Italic font Call c.xAxis().setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 10) Call c.yAxis().setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 10) ' Set x-axis and y-axis labels to use Arial Bold font Call c.xAxis().setLabelStyle("Arial Bold") Call c.yAxis().setLabelStyle("Arial Bold") ' When x-axis and y-axis color to transparent Call c.xAxis().setColors(cd.Transparent) Call c.yAxis().setColors(cd.Transparent) ' Add a scatter layer to the chart to show the position of the data points. Disable the image map ' for the scatter layer. We will use the contour layer to provide the tooltip. Call c.addScatterLayer(dataX, dataY, "", cd.Cross2Shape(0.2), 7, &H000000).setHTMLImageMap( _ "{disable}") ' Add a contour layer using the given data Set layer = c.addContourLayer(dataX, dataY, dataZ) ' Move the grid lines in front of the contour layer Call c.getPlotArea().moveGridBefore(layer) ' Add a color axis (the legend) in which the top center is anchored at (245, 455). Set the length to ' 330 pixels and the labels on the top side. Set cAxis = layer.setColorAxis(245, 455, cd.TopCenter, 330, cd.Top) ' Add a bounding box to the color axis using the default line color as border. Call cAxis.setBoundingBox(cd.Transparent, cd.LineColor) ' Add a title to the color axis using 12 points Arial Bold Italic font Call cAxis.setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 10) ' Set color axis labels to use Arial Bold font Call cAxis.setLabelStyle("Arial Bold") ' Set the color axis range as 0 to 20, with a step every 2 units Call cAxis.setLinearScale(0, 20, 2) ' Output the chart Set viewer = cd.WebChartViewer(Request, "chart1") Call viewer.setChart(c, cd.SVG) ' Include CDML tool tip for the chart. viewer.ImageMap = c.getHTMLImageMap("", "", _ "title='<*cdml*><*b*>X: {x|2}<*br*>Y: {y|2}<*br*>Z: {z|2}'") ' Output Javascript chart model to support contour chart tooltips viewer.ChartModel = c.getJsChartModel() %> <!DOCTYPE html> <html> <head> <title>Scattered Data Contour Chart</title> <!-- Include ChartDirector Javascript Library to support chart interactions --> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <div style="font:bold 18pt verdana;"> Scattered Data Contour Chart </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.asp?file=<%= Request("SCRIPT_NAME") %>">View Chart Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <%= viewer.renderHTML() %> </body> </html>

[Windows Version (in Visual Basic)] vbdemo\scattercontour.cls
Public Sub createChart(viewer As Object, chartIndex As Integer) Dim cd As New ChartDirector.API ' The (x, y, z) coordinates of the scattered data Dim dataX() dataX = Array(0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9, 1.9, 4.8, 2.4, 3.4, _ 7.9, 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4, 2.9, 8.9, 0.9, 8.9, 10.0, 1.0, 6.8, 3.8, _ 9.0, 5.3, 6.4, 4.9, 4.5, 2.0, 5.4, 0.0, 10.0, 3.9, 5.4, 5.9, 5.8, 0.3, 4.4, 8.3) Dim dataY() dataY = Array(3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8, 4.3, 1.3, 2.3, 5.4, _ 6.9, 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0, 2.9, 2.4, 3.9, 2.9, 2.3, 9.3, 2.0, 3.4, _ 4.8, 2.3, 3.4, 2.3, 1.5, 7.8, 4.5, 0.9, 6.3, 2.4, 6.9, 2.8, 1.3, 2.9, 6.4, 6.3) Dim dataZ() dataZ = Array(6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7, 8.4, 7.8, 8.0, 9.4, _ 11.9, 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6, 9.7, 10.6, 9.2, 7.0, 6.9, 9.7, 8.6, _ 8.0, 13.6, 13.2, 5.9, 9.0, 3.2, 8.3, 9.7, 8.2, 6.1, 8.7, 5.6, 14.9, 9.8, 9.3, 5.1, 10.8, _ 9.8) ' Create a XYChart object of size 450 x 540 pixels Dim c As XYChart Set c = cd.XYChart(450, 540) ' Add a title to the chart using 15 points Arial Italic font Call c.addTitle(" Contour Chart with Scattered Data", "ariali.ttf", 15) ' Set the plotarea at (65, 40) and of size 360 x 360 pixels. Use semi-transparent black ' (c0000000) for both horizontal and vertical grid lines Call c.setPlotArea(65, 40, 360, 360, -1, -1, -1, &Hc0000000, -1) ' Set x-axis and y-axis title using 12 points Arial Bold Italic font Call c.xAxis().setTitle("X-Axis Title Place Holder", "arialbi.ttf", 10) Call c.yAxis().setTitle("Y-Axis Title Place Holder", "arialbi.ttf", 10) ' Set x-axis and y-axis labels to use Arial Bold font Call c.xAxis().setLabelStyle("arialbd.ttf") Call c.yAxis().setLabelStyle("arialbd.ttf") ' When x-axis and y-axis color to transparent Call c.xAxis().setColors(cd.Transparent) Call c.yAxis().setColors(cd.Transparent) ' Add a scatter layer to the chart to show the position of the data points Call c.addScatterLayer(dataX, dataY, "", cd.Cross2Shape(0.2), 7, &H000000) ' Add a contour layer using the given data Dim layer As ContourLayer Set layer = c.addContourLayer(dataX, dataY, dataZ) ' Move the grid lines in front of the contour layer Call c.getPlotArea().moveGridBefore(layer) ' Add a color axis (the legend) in which the top center is anchored at (245, 455). Set the ' length to 330 pixels and the labels on the top side. Dim cAxis As ColorAxis Set cAxis = layer.setColorAxis(245, 455, cd.TopCenter, 330, cd.Top) ' Add a bounding box to the color axis using the default line color as border. Call cAxis.setBoundingBox(cd.Transparent, cd.LineColor) ' Add a title to the color axis using 12 points Arial Bold Italic font Call cAxis.setTitle("Color Legend Title Place Holder", "arialbi.ttf", 10) ' Set color axis labels to use Arial Bold font Call cAxis.setLabelStyle("arialbd.ttf") ' Set the color axis range as 0 to 20, with a step every 2 units Call cAxis.setLinearScale(0, 20, 2) ' Output the chart Set viewer.Picture = c.makePicture() End Sub