使用图表控件ChartDirecto创建数据点

这个例子主要是讲解了在X维度里展示不均匀的数据点。 ChartDirector不仅仅提供了Y轴的数据值绘制线，同样可以在X轴上面绘制。如果没有提供X坐标,数据点,被认为是在X维均匀分布的，在这种情况下X轴可用于标记的数据点，使用Axis.setLabels或Axis.setLabels2配置标签，标签仅用于阅读，并不会影响的数据点的定位。

另一方面，如果是不均匀间隔的数据点，或者如果在X维度有多个数据系列具有不同的间距，将要提供数据系列的X坐标，可使用Layer.setXData或Layer.setXData2 进行设置。在这种情况下，X轴与所产生ChartDirector的标签将可以自动缩放，Axis.setLinearScale ， Axis.setLogScale ， Axis.setDateScale等也将会被用于设置X轴的缩放设置。

在这个例子中，红色的线在X轴中有着不均匀间隔的数据点，使用Layer.setXData进行设置。绿线和橙色线有着均匀分布的X坐标，但在X方向的间距线不同，他们的X坐标使用Layer.setXData2设置。

代码如下：

JSP

<%@page import="ChartDirector.*" %>
<%@page import="java.util.*" %>
<%
// Data points which more unevenly spaced in time
double[] data0Y = {62, 69, 53, 58, 84, 76, 49, 61, 64, 77, 79};
Date[] data0X = {new GregorianCalendar(2007, 0, 1).getTime(), new GregorianCalendar(
    2007, 0, 2).getTime(), new GregorianCalendar(2007, 0, 5).getTime(),
    new GregorianCalendar(2007, 0, 7).getTime(), new GregorianCalendar(2007, 0, 10
    ).getTime(), new GregorianCalendar(2007, 0, 14).getTime(), new GregorianCalendar(
    2007, 0, 17).getTime(), new GregorianCalendar(2007, 0, 18).getTime(),
    new GregorianCalendar(2007, 0, 19).getTime(), new GregorianCalendar(2007, 0, 20
    ).getTime(), new GregorianCalendar(2007, 0, 21).getTime()};
                                
// Data points which are evenly spaced in a certain time range
double[] data1Y = {36, 25, 28, 38, 20, 30, 27, 35, 65, 60, 40, 73, 62, 90, 75, 72};
Date data1Start = new GregorianCalendar(2007, 0, 1).getTime();
Date data1End = new GregorianCalendar(2007, 0, 16).getTime();
                                
// Data points which are evenly spaced in another time range, in which the spacing is
// different from the above series
double[] data2Y = {25, 15, 30, 23, 32, 55, 45};
Date data2Start = new GregorianCalendar(2007, 0, 9).getTime();
Date data2End = new GregorianCalendar(2007, 0, 21).getTime();
                                
// Create a XYChart object of size 600 x 400 pixels. Use a vertical gradient color
// from light blue (99ccff) to white (ffffff) spanning the top 100 pixels as
// background. Set border to grey (888888). Use rounded corners. Enable soft drop
// shadow.
XYChart c = new XYChart(600, 400);
c.setc.linearGradientColor(0,  0, 0, 100, 0x99ccff, 0xffffff), 0x888888);
c.setRoundedFrame();
c.setDropShadow();
                                
// Add a title using 18 pts Times New Roman Bold Italic font. Set top margin to 16
// pixels.
c.addTitle("Product Line Order Backlog", "Times New Roman Bold Italic", 18
    ).setMargin2(0, 0, 16, 0);
                                
// Set the plotarea at (60, 80) and of 510 x 275 pixels in size. Use transparent
// border and dark grey (444444) dotted grid lines
PlotArea plotArea = c.setPlotArea(60, 80, 510, 275, -1, -1, Chart.Transparent,
    c.dashLineColor(0x444444, 0x0101), -1);
                                
// Add a legend box where the top-center is anchored to the horizontal center of the
// plot area at y = 45. Use horizontal layout and 10 points Arial Bold font, and
// transparent background and border.
LegendBox legendBox = c.addLegend(plotArea.getLeftX() + plotArea.getWidth() / 2, 45,
    false, "Arial Bold", 10);
legendBox.setAlignment(Chart.TopCenter);
legendBox.setChart.Transparent,  Chart.Transparent);
                                
// Set x-axis tick density to 75 pixels and y-axis tick density to 30 pixels.
// ChartDirector auto-scaling will use this as the guidelines when putting ticks on
// the x-axis and y-axis.
c.yAxis().setTickDensity(30);
c.xAxis().setTickDensity(75);
                                
// Set all axes to transparent
c.xAxis().setColors(Chart.Transparent);
c.yAxis().setColors(Chart.Transparent);
                                
// Set the x-axis margins to 15 pixels, so that the horizontal grid lines can extend
// beyond the leftmost and rightmost vertical grid lines
c.xAxis().setMargin(15, 15);
                                
// Set axis label style to 8pts Arial Bold
c.xAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setLabelStyle("Arial Bold", 8);
c.yAxis2().setLabelStyle("Arial Bold", 8);
                                
// Add axis title using 10pts Arial Bold Italic font
c.yAxis().setTitle("Backlog in USD millions", "Arial Bold Italic", 10);
                                
// Add the first data series
LineLayer layer0 = c.addLineLayer2();
layer0.addDataSet(data0Y, 0xff0000, "Quantum Computer").setDataSymbol(
    Chart.GlassSphere2Shape, 11);
layer0.setXData(data0X);
layer0.setLineWidth(3);
                                
// Add the second data series
LineLayer layer1 = c.addLineLayer2();
layer1.addDataSet(data1Y, 0x00ff00, "Atom Synthesizer").setDataSymbol(
    Chart.GlassSphere2Shape, 11);
layer1.setXData2(data1Start, data1End);
layer1.setLineWidth(3);
                                
// Add the third data series
LineLayer layer2 = c.addLineLayer2();
layer2.addDataSet(data2Y, 0xff6600, "Proton Cannon").setDataSymbol(
    Chart.GlassSphere2Shape, 11);
layer2.setXData2(data2Start, data2End);
layer2.setLineWidth(3);
                                
// Output the chart
String chart1URL = c.makeSession(request, "chart1");
                                
// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "",
    "title='Backlog of {dataSetName} at {x|mm/dd/yyyy}: US$ {value}M'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Uneven Data Points
</div>
<hr color="#000080">
<div style="font-size:10pt; font-family:verdana; margin-bottom:1.5em">
    <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a>
</div>
<img src=\'#\'"     usemap="#map1" border="0">
<map name="map1"><%=imageMap1%></map>
</body>
</html>

Java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import ChartDirector.*;
                           
public class unevenpoints implements DemoModule
{
    //Name of demo program
    public String toString() { return "Uneven Data Points "; }
                           
    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }
                           
    //Main code for creating charts
    public void createChart(ChartViewer viewer, int index)
    {
        // Data points which more unevenly spaced in time
        double[] data0Y = {62, 69, 53, 58, 84, 76, 49, 61, 64, 77, 79};
        Date[] data0X = {new GregorianCalendar(2007, 0, 1).getTime(),
            new GregorianCalendar(2007, 0, 2).getTime(), new GregorianCalendar(2007,
            0, 5).getTime(), new GregorianCalendar(2007, 0, 7).getTime(),
            new GregorianCalendar(2007, 0, 10).getTime(), new GregorianCalendar(2007,
            0, 14).getTime(), new GregorianCalendar(2007, 0, 17).getTime(),
            new GregorianCalendar(2007, 0, 18).getTime(), new GregorianCalendar(2007,
            0, 19).getTime(), new GregorianCalendar(2007, 0, 20).getTime(),
            new GregorianCalendar(2007, 0, 21).getTime()};
                           
        // Data points which are evenly spaced in a certain time range
        double[] data1Y = {36, 25, 28, 38, 20, 30, 27, 35, 65, 60, 40, 73, 62, 90,
            75, 72};
        Date data1Start = new GregorianCalendar(2007, 0, 1).getTime();
        Date data1End = new GregorianCalendar(2007, 0, 16).getTime();
                           
        // Data points which are evenly spaced in another time range, in which the
        // spacing is different from the above series
        double[] data2Y = {25, 15, 30, 23, 32, 55, 45};
        Date data2Start = new GregorianCalendar(2007, 0, 9).getTime();
        Date data2End = new GregorianCalendar(2007, 0, 21).getTime();
                           
        // Create a XYChart object of size 600 x 400 pixels. Use a vertical gradient
        // color from light blue (99ccff) to white (ffffff) spanning the top 100
        // pixels as background. Set border to grey (888888). Use rounded corners.
        // Enable soft drop shadow.
        XYChart c = new XYChart(600, 400);
        c.setc.linearGradientColor(0,  0, 0, 100, 0x99ccff, 0xffffff),
            0x888888);
        c.setRoundedFrame();
        c.setDropShadow();
                           
        // Add a title using 18 pts Times New Roman Bold Italic font. Set top margin
        // to 16 pixels.
        c.addTitle("Product Line Order Backlog", "Times New Roman Bold Italic", 18
            ).setMargin2(0, 0, 16, 0);
                           
        // Set the plotarea at (60, 80) and of 510 x 275 pixels in size. Use
        // transparent border and dark grey (444444) dotted grid lines
        PlotArea plotArea = c.setPlotArea(60, 80, 510, 275, -1, -1,
            Chart.Transparent, c.dashLineColor(0x444444, 0x0101), -1);
                           
        // Add a legend box where the top-center is anchored to the horizontal center
        // of the plot area at y = 45. Use horizontal layout and 10 points Arial Bold
        // font, and transparent background and border.
        LegendBox legendBox = c.addLegend(plotArea.getLeftX() + plotArea.getWidth() /
            2, 45, false, "Arial Bold", 10);
        legendBox.setAlignment(Chart.TopCenter);
        legendBox.setChart.Transparent,  Chart.Transparent);
                           
        // Set x-axis tick density to 75 pixels and y-axis tick density to 30 pixels.
        // ChartDirector auto-scaling will use this as the guidelines when putting
        // ticks on the x-axis and y-axis.
        c.yAxis().setTickDensity(30);
        c.xAxis().setTickDensity(75);
                           
        // Set all axes to transparent
        c.xAxis().setColors(Chart.Transparent);
        c.yAxis().setColors(Chart.Transparent);
                           
        // Set the x-axis margins to 15 pixels, so that the horizontal grid lines can
        // extend beyond the leftmost and rightmost vertical grid lines
        c.xAxis().setMargin(15, 15);
                           
        // Set axis label style to 8pts Arial Bold
        c.xAxis().setLabelStyle("Arial Bold", 8);
        c.yAxis().setLabelStyle("Arial Bold", 8);
        c.yAxis2().setLabelStyle("Arial Bold", 8);
                           
        // Add axis title using 10pts Arial Bold Italic font
        c.yAxis().setTitle("Backlog in USD millions", "Arial Bold Italic", 10);
                           
        // Add the first data series
        LineLayer layer0 = c.addLineLayer2();
        layer0.addDataSet(data0Y, 0xff0000, "Quantum Computer").setDataSymbol(
            Chart.GlassSphere2Shape, 11);
        layer0.setXData(data0X);
        layer0.setLineWidth(3);
                           
        // Add the second data series
        LineLayer layer1 = c.addLineLayer2();
        layer1.addDataSet(data1Y, 0x00ff00, "Atom Synthesizer").setDataSymbol(
            Chart.GlassSphere2Shape, 11);
        layer1.setXData2(data1Start, data1End);
        layer1.setLineWidth(3);
                           
        // Add the third data series
        LineLayer layer2 = c.addLineLayer2();
        layer2.addDataSet(data2Y, 0xff6600, "Proton Cannon").setDataSymbol(
            Chart.GlassSphere2Shape, 11);
        layer2.setXData2(data2Start, data2End);
        layer2.setLineWidth(3);
                           
        // Output the chart
        viewer.setChart(c);
                           
        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='Backlog of {dataSetName} at {x|mm/dd/yyyy}: US$ {value}M'"));
    }
                           
    //Allow this module to run as standalone program for easy testing
    public static void main(String[] args)
    {
        //Instantiate an instance of this demo module
        DemoModule demo = new unevenpoints();
                           
        //Create and set up the main window
        JFrame frame = new JFrame(demo.toString());
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);} });
        frame.getContentPane().setColor.white);
                            
        // Create the chart and put them in the content pane
        ChartViewer viewer = new ChartViewer();
        demo.createChart(viewer, 0);
        frame.getContentPane().add(viewer);
                           
        // Display the window
        frame.pack();
        frame.setVisible(true);
    }
}

参考资料：图表控件ChartDirector使用教程