ChartDirector 7.0 (Java 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

[JSP Version] jspdemo/gradientbar.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the bar chart double[] data = {1350, 1600, 1950, 2300, 2700}; // The labels for the bar chart String[] labels = {"2001", "2002", "2003", "2004", "2005"}; // The colors for the bars int[] colors = {0xcc0000, 0x66aaee, 0xeebb22, 0xcccccc, 0xcc88ff}; // Create a PieChart object of size 600 x 380 pixels. XYChart c = new XYChart(600, 380); // Use the white on black palette, which means the default text and line colors are white c.setColors(Chart.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. c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044)); c.setRoundedFrame(0xffffff, 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. TextBox title = c.addTitle("Annual Revenue for Star Tech", "Times New Roman Bold Italic", 18); title.setMargin2(0, 0, 6, 6); // Add a separator line in white color just under the title c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), 0xffffff); // Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent border // and white grid lines c.setPlotArea(70, 80, 480, 240, -1, -1, Chart.Transparent, 0xffffff); // Swap the axis so that the bars are drawn horizontally 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 c.addBarLayer3(data, colors).setBorderColor(Chart.Transparent, Chart.barLighting(0.75, 2.0)); // Set the labels on the x axis. c.xAxis().setLabels(labels); // Show the same scale on the left and right y-axes c.syncYAxis(); // Set the bottom y-axis title using 10pt Arial Bold font c.yAxis().setTitle("USD (millions)", "Arial Bold", 10); // Set y-axes to transparent c.yAxis().setColors(Chart.Transparent); c.yAxis2().setColors(Chart.Transparent); // Disable ticks on the x-axis by setting the tick color to transparent c.xAxis().setTickColor(Chart.Transparent); // Set the label styles of all axes to 8pt Arial Bold font c.xAxis().setLabelStyle("Arial Bold", 8); c.yAxis().setLabelStyle("Arial Bold", 8); 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. c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25); // Output the chart WebChartViewer viewer = new WebChartViewer(request, "chart1"); viewer.setChart(c, Chart.SVG); // Include tool tip for the chart viewer.setImageMap(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.jsp?file=<%=request.getServletPath()%>">View Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <%= viewer.renderHTML(response) %> </body> </html>