ChartDirector 7.0 (Java Edition)

Custom Symbols




This example demonstrates loading external image files as data symbols by using DataSet.setDataSymbol2.

Source Code Listing

[JSP Version] jspdemo/customsymbolline.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the chart double[] data0 = {600, 800, 1200, 1500, 1800, 1900, 2000, 1950}; double[] data1 = {300, 450, 500, 1000, 1500, 1600, 1650, 1600}; // The labels for the chart String[] labels = {"1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002"}; // Create a XYChart object of size 450 x 250 pixels, with a pale yellow (0xffffc0) background, a // black border, and 1 pixel 3D border effect. XYChart c = new XYChart(450, 250, 0xffffc0, 0, 1); // Set the plotarea at (60, 45) and of size 360 x 170 pixels, using white (0xffffff) as the plot // area background color. Turn on both horizontal and vertical grid lines with light grey color // (0xc0c0c0) c.setPlotArea(60, 45, 360, 170, 0xffffff, -1, -1, 0xc0c0c0, -1); // Add a legend box at (60, 20) (top of the chart) with horizontal layout. Use 8pt Arial Bold font. // Set the background and border color to Transparent. c.addLegend(60, 20, false, "Arial Bold", 8).setBackground(Chart.Transparent); // Add a title to the chart using 12pt Arial Bold/white font with a dark blue (000060) background. c.addTitle("Information Resource Usage", "Arial Bold", 12, 0xffffff).setBackground(0x000060); // Set the labels on the x axis c.xAxis().setLabels(labels); // Reserve 8 pixels margins at both side of the x axis to avoid the first and last symbols drawing // outside of the plot area c.xAxis().setMargin(8, 8); // Add a title to the y axis c.yAxis().setTitle("Population"); // Add a line layer to the chart LineLayer layer = c.addLineLayer2(); // Add the first line using small_user.png as the symbol. layer.addDataSet(data0, 0xcf4040, "Users").setDataSymbol2("small_user.png"); // Add the first line using small_computer.png as the symbol. layer.addDataSet(data1, 0x40cf40, "Computers").setDataSymbol2("small_computer.png"); // Set the line width to 3 pixels layer.setLineWidth(3); // 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='Number of {dataSetName} at {xLabel}: {value}'") ); %> <!DOCTYPE html> <html> <head> <title>Custom Symbols</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;"> Custom Symbols </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>