使用圖表控件ChartDirecto創建數據點

這個例子主要是講解了在X維度裏展示不均勻的數據點。 ChartDirector不僅僅提供了Y軸的數據值繪製線，同樣可以在X軸上面繪製。如果沒有提供X座標,數據點,被認爲是在X維均勻分佈的，在這種情況下X軸可用於標記的數據點，使用Axis.setLabels或Axis.setLabels2配置標籤，標籤僅用於閱讀，並不會影響的數據點的定位。

另一方面，如果是不均勻間隔的數據點，或者如果在X維度有多個數據系列具有不同的間距，將要提供數據系列的X座標，可使用Layer.setXData或Layer.setXData2 進行設置。在這種情況下，X軸與所產生ChartDirector的標籤將可以自動縮放，Axis.setLinearScale ， Axis.setLogScale ， Axis.setDateScale等也將會被用於設置X軸的縮放設置。

在這個例子中，紅色的線在X軸中有着不均勻間隔的數據點，使用Layer.setXData進行設置。綠線和橙色線有着均勻分佈的X座標，但在X方向的間距線不同，他們的X座標使用Layer.setXData2設置。

代碼如下：

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='<%=response.encodeURL("getchart.jsp?"+chart1URL)%>'
    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);
    }
}

參考資料：圖表控件ChartDirector使用教程