Symbol Line Chart

This example demonstrates using symbols to represent data points, and putting data labels on top of the symbols.

Note that in this example, the chart title background is not a solid color but a 1 x 2 pixels pattern.

Set background color and 3D border for the chart using XYChart.XYChart.
Enable both vertical and horizontal grid lines using XYChart.setPlotArea.
Create a pattern color with a 1 x 2 pixel in-memory pattern using BaseChart.patternColor. Set it as the background color of the title box using Box.setBackground.
Enable symbols for the data points using DataSet.setDataSymbol.
Add labels on top of the symbols using Layer.setDataLabelFormat.

[JSP Version] jspdemo/symbolline.jsp

<%@page import="ChartDirector.*, java.util.*" %>
<%
// The data for the line chart
double[] data0 = {60.2, 51.7, 81.3, 48.6, 56.2, 68.9, 52.8};
double[] data1 = {30.0, 32.7, 33.9, 29.5, 32.2, 28.4, 29.8};
String[] labels = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

// Create a XYChart object of size 300 x 180 pixels, with a pale yellow (0xffffc0) background, a
// black border, and 1 pixel 3D border effect.
XYChart c = new XYChart(300, 180, 0xffffc0, 0x000000, 1);

// Set the plotarea at (45, 35) and of size 240 x 120 pixels, with white background. Turn on both
// horizontal and vertical grid lines with light grey color (0xc0c0c0)
c.setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, 0xc0c0c0, -1);

// Add a legend box at (45, 12) (top of the chart) using horizontal layout and 8pt Arial font Set
// the background and border color to Transparent.
c.addLegend(45, 12, false, "", 8).setBackground(Chart.Transparent);

// Add a title to the chart using 9pt Arial Bold/white font. Use a 1 x 2 bitmap pattern as the
// background.
c.addTitle("Server Load (Jun 01 - Jun 07)", "Arial Bold", 9, 0xffffff).setBackground(c.patternColor(
    new int[]{0x004000, 0x008000}, 2));

// Set the y axis label format to nn%
c.yAxis().setLabelFormat("{value}%");

// Set the labels on the x axis
c.xAxis().setLabels(labels);

// Add a line layer to the chart
LineLayer layer = c.addLineLayer();

// Add the first line. Plot the points with a 7 pixel square symbol
layer.addDataSet(data0, 0xcf4040, "Peak").setDataSymbol(Chart.SquareSymbol, 7);

// Add the second line. Plot the points with a 9 pixel dismond symbol
layer.addDataSet(data1, 0x40cf40, "Average").setDataSymbol(Chart.DiamondSymbol, 9);

// Enable data label on the data points. Set the label format to nn%.
layer.setDataLabelFormat("{value|0}%");

// 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='{xLabel}: {dataSetName} {value}%'"));
%>
<!DOCTYPE html>
<html>
<head>
    <title>Symbol Line 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;">
        Symbol Line Chart
    </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>