如何使用ChartDirector 畫線狀圖？在下文中將以實例進行說明。
<%@ page language="java" import="java.util.*,com.chinaba.*" pageEncoding="UTF-8"%>
<%@page import="ChartDirector.*" %>
<% List list =(List) request.getAttribute("results");
int s =list.size();
double[] data=new double[s];
String[] labels=new String[s];
for (int i=0;i<list.size();i++){
infobean info = (infobean)list.get(i);
data[i]=info.getC();
labels[i]=info.getA();
out.println(data[i]);
out.println(labels[i]);
}
request.setCharacterEncoding("utf-8");
//支持中文
// Create a XYChart object of size 600 x 300 pixels, with a pale red (ffdddd)
// background, black border, 1 pixel 3D border effect and rounded corners.
XYChart c = new XYChart(600, 300, 0xffdddd, 0x000000, 1);
c.setDefaultFonts("SIMSUN.TTC","simhei.ttf");
c.setRoundedFrame();
//Set search path to current JSP directory for loading icon images
c.setSearchPath(getServletConfig().getServletContext(), request);
// Set the plotarea at (55, 58) and of size 520 x 195 pixels, with white (ffffff)
// background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 58, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);
// Add a legend box at (55, 32) (top of the chart) with horizontal layout. Use 9 pts
// Arial Bold font. Set the background and border color to Transparent.
c.addLegend(55, 32, false, "Arial Bold", 9).setBackground(Chart.Transparent);
// Add a title box to the chart using 15 pts Times Bold Italic font. The title is in
// CDML and includes embedded images for highlight. The text is white (ffffff) on a
// dark red (880000) background, with soft lighting effect from the right side.
c.addTitle(
"<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> 每日任務單統計 " +
"<*img=star.png*><*img=star.png*><*/*>", "",
15, 0xffffff).setBackground(0x880000, -1, Chart.softLighting(Chart.Right));
// Add a title to the y axis
c.yAxis().setTitle("Energy Concentration (KJ per liter)");
// Set the labels on the x axis
c.xAxis().setLabels(labels);
// Add a title to the x axis using CMDL
c.xAxis().setTitle(
"<*block,valign=absmiddle*><*img=clock.png*> Elapsed Time (hour)<*/*>");
// Set the axes width to 2 pixels
c.xAxis().setWidth(2);
c.yAxis().setWidth(2);
// Add a spline layer to the chart
SplineLayer layer = c.addSplineLayer();
// Set the default line width to 2 pixels
layer.setLineWidth(2);
// Add a data set to the spline layer, using blue (0000c0) as the line color, with
// yellow (ffff00) circle symbols.
//layer.addDataSet(data1, 0x0000c0, "Target Group").setDataSymbol(Chart.CircleSymbol,
// 9, 0xffff00);
// Add a data set to the spline layer, using brown (982810) as the line color, with
// pink (f040f0) diamond symbols.
layer.addDataSet(data, 0x982810, "day").setDataSymbol(Chart.DiamondSymbol,
11, 0xf040f0);
layer.setDataLabelFormat("{value}");
// Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 250,
"<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*><*font=Times " +
"New Roman Bold Italic,size=10,color=804040*>Molecular\nEngineering<*/*>"
).setAlignment(Chart.BottomRight);
// Output the chart
String chart1URL = c.makeSession(request, "chart1");
// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "",
"title='{dataSetName} at t = {xLabel} hour: {value} KJ/liter'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
Spline Line Chart
</div>
<hr color="#000080">
<div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em">
<a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a>
</div>
<img src='<%=response.encodeURL("/shenlei/getchart.jsp?"+chart1URL)%>'
usemap="#map1" border="0">
<map name="map1"><%=imageMap1%></map>
</body>
</html>
如果要在線的頂部顯示數值，可以調用Layer的setDataLabelFormat方法設置，
范例：layer.setDataLabelFormat("{value}");
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文章轉載自：網易博客
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