ChartDirector 7.0 (ASP/COM/VB Edition)

Gradient Bar Shading




This example demonstrates using bar gradient shading for a horizontal bar chart. It also demonstrates using gradient color background, partially rounded frame, and automatic resizing of the plot area to fit the chart.

Source Code Listing

[Web Version (in ASP)] aspdemo\gradientbar.asp
<%@ language="vbscript" %> <% Set cd = CreateObject("ChartDirector.API") ' The data for the bar chart data = Array(1350, 1600, 1950, 2300, 2700) ' The labels for the bar chart labels = Array("2001", "2002", "2003", "2004", "2005") ' The colors for the bars colors = Array(&Hcc0000, &H66aaee, &Heebb22, &Hcccccc, &Hcc88ff) ' Create a PieChart object of size 600 x 380 pixels. Set c = cd.XYChart(600, 380) ' Use the white on black palette, which means the default text and line colors are white Call c.setColors(cd.whiteOnBlackPalette) ' Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use rounded ' corners of 30 pixels radius for the top-left and bottom-right corners. Call c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), &H0000cc, &H000044)) Call c.setRoundedFrame(&Hffffff, 30, 0, 30, 0) ' Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom margins to ' the title. Set title = c.addTitle("Annual Revenue for Star Tech", "Times New Roman Bold Italic", 18) Call title.setMargin2(0, 0, 6, 6) ' Add a separator line in white color just under the title Call c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), &Hffffff) ' Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent border ' and white grid lines Call c.setPlotArea(70, 80, 480, 240, -1, -1, cd.Transparent, &Hffffff) ' Swap the axis so that the bars are drawn horizontally Call c.swapXY() ' Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with the ' light intensity from 0.75 to 2.0 Call c.addBarLayer3(data, colors).setBorderColor(cd.Transparent, cd.barLighting(0.75, 2.0)) ' Set the labels on the x axis. Call c.xAxis().setLabels(labels) ' Show the same scale on the left and right y-axes Call c.syncYAxis() ' Set the bottom y-axis title using 10pt Arial Bold font Call c.yAxis().setTitle("USD (millions)", "Arial Bold", 10) ' Set y-axes to transparent Call c.yAxis().setColors(cd.Transparent) Call c.yAxis2().setColors(cd.Transparent) ' Disable ticks on the x-axis by setting the tick color to transparent Call c.xAxis().setTickColor(cd.Transparent) ' Set the label styles of all axes to 8pt Arial Bold font Call c.xAxis().setLabelStyle("Arial Bold", 8) Call c.yAxis().setLabelStyle("Arial Bold", 8) Call c.yAxis2().setLabelStyle("Arial Bold", 8) ' Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels from the ' left edge, 25 pixels below the title, 50 pixels from the right edge, and 25 pixels from the bottom ' edge. Call c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25) ' 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='Year {xLabel}: US$ {value}M'") %> <!DOCTYPE html> <html> <head> <title>Gradient Bar Shading</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;"> Gradient Bar Shading </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\gradientbar.cls
Public Sub createChart(viewer As Object, chartIndex As Integer) Dim cd As New ChartDirector.API ' The data for the bar chart Dim data() data = Array(1350, 1600, 1950, 2300, 2700) ' The labels for the bar chart Dim labels() labels = Array("2001", "2002", "2003", "2004", "2005") ' The colors for the bars Dim colors() colors = Array(&Hcc0000, &H66aaee, &Heebb22, &Hcccccc, &Hcc88ff) ' Create a PieChart object of size 600 x 380 pixels. Dim c As XYChart Set c = cd.XYChart(600, 380) ' Use the white on black palette, which means the default text and line colors are white Call c.setColors(cd.whiteOnBlackPalette) ' Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use ' rounded corners of 30 pixels radius for the top-left and bottom-right corners. Call c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), &H0000cc, &H000044)) Call c.setRoundedFrame(&Hffffff, 30, 0, 30, 0) ' Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom margins ' to the title. Dim title As ChartDirector.TextBox Set title = c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18) Call title.setMargin2(0, 0, 6, 6) ' Add a separator line in white color just under the title Call c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), &Hffffff) ' Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent ' border and white grid lines Call c.setPlotArea(70, 80, 480, 240, -1, -1, cd.Transparent, &Hffffff) ' Swap the axis so that the bars are drawn horizontally Call c.swapXY() ' Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with the ' light intensity from 0.75 to 2.0 Call c.addBarLayer3(data, colors).setBorderColor(cd.Transparent, cd.barLighting(0.75, 2.0)) ' Set the labels on the x axis. Call c.xAxis().setLabels(labels) ' Show the same scale on the left and right y-axes Call c.syncYAxis() ' Set the bottom y-axis title using 10pt Arial Bold font Call c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10) ' Set y-axes to transparent Call c.yAxis().setColors(cd.Transparent) Call c.yAxis2().setColors(cd.Transparent) ' Disable ticks on the x-axis by setting the tick color to transparent Call c.xAxis().setTickColor(cd.Transparent) ' Set the label styles of all axes to 8pt Arial Bold font Call c.xAxis().setLabelStyle("arialbd.ttf", 8) Call c.yAxis().setLabelStyle("arialbd.ttf", 8) Call c.yAxis2().setLabelStyle("arialbd.ttf", 8) ' Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels from ' the left edge, 25 pixels below the title, 50 pixels from the right edge, and 25 pixels from ' the bottom edge. Call c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25) ' Output the chart Set viewer.Picture = c.makePicture() 'include tool tip for the chart viewer.ImageMap = c.getHTMLImageMap("clickable", "", "title='Year {xLabel}: US$ {value}M'") End Sub