ChartDirector 7.0 (ASP/COM/VB Edition)

X Zone Coloring




This example demonstrates using x zone colors - colors that change at certain x value thresholds.

In this example, a x zone colors are used as the color of the line, and as the fill color of the band surrounding the line.

The x zone color for the line is configured to change from solid blue color to a red dash line color upon reaching a certain x value threshold. The x zone color for the band is configured to change from semi-transparent blue to semi-transparent red upon reaching the same threshold.

X zone colors are created using Layer.xZoneColor. You can use a x zone color in any ChartDirector API that expects a color. For instance, you can use a x zone color as background color, fill color of data sets, line color, etc.

A single x zone color can support one threshold value and change between two colors. The two colors can be any colors, including another x zone color. You may create x zone colors with multiple thresholds by cascading multiple x zone colors this way.

Source Code Listing

[Web Version (in ASP)] aspdemo\xzonecolor.asp
<%@ language="vbscript" %> <% Set cd = CreateObject("ChartDirector.API") ' The data for the chart data = Array(50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84, _ 82, 80, 84, 89) ' The error data representing the error band around the data points errData = Array(5, 6, 5.1, 6.5, 6.6, 8, 5.4, 5.1, 4.6, 5.0, 5.2, 6.0, 4.9, 5.6, 4.8, 6.2, 7.4, _ 7.1, 6.5, 9.6, 12.1, 15.3, 18.5, 20.9, 24.1) ' The timestamps for the data labels = Array(DateSerial(2001, 1, 1), DateSerial(2001, 2, 1), DateSerial(2001, 3, 1), DateSerial( _ 2001, 4, 1), DateSerial(2001, 5, 1), DateSerial(2001, 6, 1), DateSerial(2001, 7, 1), _ DateSerial(2001, 8, 1), DateSerial(2001, 9, 1), DateSerial(2001, 10, 1), DateSerial(2001, 11, _ 1), DateSerial(2001, 12, 1), DateSerial(2002, 1, 1), DateSerial(2002, 2, 1), DateSerial(2002, _ 3, 1), DateSerial(2002, 4, 1), DateSerial(2002, 5, 1), DateSerial(2002, 6, 1), DateSerial( _ 2002, 7, 1), DateSerial(2002, 8, 1), DateSerial(2002, 9, 1), DateSerial(2002, 10, 1), _ DateSerial(2002, 11, 1), DateSerial(2002, 12, 1), DateSerial(2003, 1, 1)) ' Create a XYChart object of size 550 x 220 pixels Set c = cd.XYChart(550, 220) ' Set the plot area at (50, 10) and of size 480 x 180 pixels. Enabled both vertical and horizontal ' grids by setting their colors to light grey (cccccc) Call c.setPlotArea(50, 10, 480, 180).setGridColor(&Hcccccc, &Hcccccc) ' Add a legend box (50, 10) (top of plot area) using horizontal layout. Use 8pt Arial font. Disable ' bounding box (set border to transparent). Set legendBox = c.addLegend(50, 10, False, "", 8) Call legendBox.setBackground(cd.Transparent) ' Add keys to the legend box to explain the color zones Call legendBox.addKey("Historical", &H9999ff) Call legendBox.addKey("Forecast", &Hff9966) ' Add a title to the y axis. Call c.yAxis().setTitle("Energy Consumption") ' Set the labels on the x axis Call c.xAxis().setLabels2(labels) ' Set multi-style axis label formatting. Use Arial Bold font for yearly labels and display them as ' "yyyy". Use default font for monthly labels and display them as "mmm". Replace some labels with ' minor ticks to ensure the labels are at least 3 units apart. Call c.xAxis().setMultiFormat(cd.StartOfYearFilter(), "<*font=Arial Bold*>{value|yyyy}", _ cd.StartOfMonthFilter(), "{value|mmm}", 3) ' Add a line layer to the chart Set layer = c.addLineLayer2() ' Create the color to draw the data line. The line is blue (0x333399) to the left of x = 18, and ' become a red (0xd04040) dash line to the right of x = 18. lineColor = layer.xZoneColor(18, &H333399, c.dashLineColor(&Hd04040, cd.DashLine)) ' Add the data line Call layer.addDataSet(data, lineColor, "Average") ' We are not showing the data set name in the legend box. The name is for showing in tool tips only. Call layer.setLegend(cd.NoLegend) ' Create the color to draw the err zone. The color is semi-transparent blue (0x809999ff) to the left ' of x = 18, and become semi-transparent red (0x80ff9966) to the right of x = 18. errColor = layer.xZoneColor(18, &H809999ff, &H80ff9966) ' Add the upper border of the err zone Call layer.addDataSet(cd.ArrayMath(data).add(errData).result(), errColor, "Upper bound") ' Add the lower border of the err zone Call layer.addDataSet(cd.ArrayMath(data).subtract(errData).result(), errColor, "Lower bound") ' Set the default line width to 2 pixels Call layer.setLineWidth(2) ' In this example, we are not showing the data set name in the legend box Call layer.setLegend(cd.NoLegend) ' Color the region between the err zone lines Call c.addInterLineLayer(layer.getLine(1), layer.getLine(2), errColor) ' Output the chart Set viewer = cd.WebChartViewer(Request, "chart1") Call viewer.setChart(c, cd.SVG) ' Include tool tip for the chart. viewer.ImageMap = c.getHTMLImageMap("", "", _ "title='{dataSetName} on {xLabel|mmm yyyy}: {value} MJoule'") %> <!DOCTYPE html> <html> <head> <title>X Zone Coloring</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;"> X Zone Coloring </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\xzonecolor.cls
Public Sub createChart(viewer As Object, chartIndex As Integer) Dim cd As New ChartDirector.API ' The data for the chart Dim data() data = Array(50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, _ 84, 82, 80, 84, 89) ' The error data representing the error band around the data points Dim errData() errData = Array(5, 6, 5.1, 6.5, 6.6, 8, 5.4, 5.1, 4.6, 5.0, 5.2, 6.0, 4.9, 5.6, 4.8, 6.2, 7.4, _ 7.1, 6.5, 9.6, 12.1, 15.3, 18.5, 20.9, 24.1) ' The timestamps for the data Dim labels() labels = Array(DateSerial(2001, 1, 1), DateSerial(2001, 2, 1), DateSerial(2001, 3, 1), _ DateSerial(2001, 4, 1), DateSerial(2001, 5, 1), DateSerial(2001, 6, 1), DateSerial(2001, _ 7, 1), DateSerial(2001, 8, 1), DateSerial(2001, 9, 1), DateSerial(2001, 10, 1), _ DateSerial(2001, 11, 1), DateSerial(2001, 12, 1), DateSerial(2002, 1, 1), DateSerial(2002, _ 2, 1), DateSerial(2002, 3, 1), DateSerial(2002, 4, 1), DateSerial(2002, 5, 1), DateSerial( _ 2002, 6, 1), DateSerial(2002, 7, 1), DateSerial(2002, 8, 1), DateSerial(2002, 9, 1), _ DateSerial(2002, 10, 1), DateSerial(2002, 11, 1), DateSerial(2002, 12, 1), DateSerial( _ 2003, 1, 1)) ' Create a XYChart object of size 550 x 220 pixels Dim c As XYChart Set c = cd.XYChart(550, 220) ' Set the plot area at (50, 10) and of size 480 x 180 pixels. Enabled both vertical and ' horizontal grids by setting their colors to light grey (cccccc) Call c.setPlotArea(50, 10, 480, 180).setGridColor(&Hcccccc, &Hcccccc) ' Add a legend box (50, 10) (top of plot area) using horizontal layout. Use 8pt Arial font. ' Disable bounding box (set border to transparent). Dim legendBox As LegendBox Set legendBox = c.addLegend(50, 10, False, "", 8) Call legendBox.setBackground(cd.Transparent) ' Add keys to the legend box to explain the color zones Call legendBox.addKey("Historical", &H9999ff) Call legendBox.addKey("Forecast", &Hff9966) ' Add a title to the y axis. Call c.yAxis().setTitle("Energy Consumption") ' Set the labels on the x axis Call c.xAxis().setLabels2(labels) ' Set multi-style axis label formatting. Use Arial Bold font for yearly labels and display them ' as "yyyy". Use default font for monthly labels and display them as "mmm". Replace some labels ' with minor ticks to ensure the labels are at least 3 units apart. Call c.xAxis().setMultiFormat(cd.StartOfYearFilter(), "<*font=arialbd.ttf*>{value|yyyy}", _ cd.StartOfMonthFilter(), "{value|mmm}", 3) ' Add a line layer to the chart Dim layer As LineLayer Set layer = c.addLineLayer2() ' Create the color to draw the data line. The line is blue (0x333399) to the left of x = 18, and ' become a red (0xd04040) dash line to the right of x = 18. Dim lineColor As Long lineColor = layer.xZoneColor(18, &H333399, c.dashLineColor(&Hd04040, cd.DashLine)) ' Add the data line Call layer.addDataSet(data, lineColor, "Average") ' We are not showing the data set name in the legend box. The name is for showing in tool tips ' only. Call layer.setLegend(cd.NoLegend) ' Create the color to draw the err zone. The color is semi-transparent blue (0x809999ff) to the ' left of x = 18, and become semi-transparent red (0x80ff9966) to the right of x = 18. Dim errColor As Long errColor = layer.xZoneColor(18, &H809999ff, &H80ff9966) ' Add the upper border of the err zone Call layer.addDataSet(cd.ArrayMath(data).add(errData).result(), errColor, "Upper bound") ' Add the lower border of the err zone Call layer.addDataSet(cd.ArrayMath(data).subtract(errData).result(), errColor, "Lower bound") ' Set the default line width to 2 pixels Call layer.setLineWidth(2) ' In this example, we are not showing the data set name in the legend box Call layer.setLegend(cd.NoLegend) ' Color the region between the err zone lines Call c.addInterLineLayer(layer.getLine(1), layer.getLine(2), errColor) ' Output the chart Set viewer.Picture = c.makePicture() ' Include tool tip for the chart. viewer.ImageMap = c.getHTMLImageMap("clickable", "", _ "title='{dataSetName} on {xLabel|mmm yyyy}: {value} MJoule'") End Sub