ChartDirector 6.1 (Java Edition)

Vector Chart




This example demonstrates a vector chart.

A vector chart is like a scatter chart, but the symbols are arrows which can be of arbitrary lengths pointing to arbitrary directions. Thus each symbol in a vector chart is specified by 4 values - the x and y coordinates, the length and the direction.

In ChartDirector, an XY vector layer is created using XYChart.addVectorLayer.

Source Code Listing

[JSP Version] jspdemo/vector.jsp
<%@page import="ChartDirector.*" %>
<%
// The (x, y) coordinates of the starting point of the vectors
double[] dataX = {20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, 80,
    100, 20, 40, 60, 80, 100};
double[] dataY = {20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80,
    80, 100, 100, 100, 100, 100};

// The lengths (radii) and directions (angles) of the vectors
double[] dataR = {6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6, 6
    };
double[] dataA = {-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135,
    180, 135, 120, -135, -150, 180, 150, 135};

// Create a XYChart object of size 450 x 390 pixels
XYChart c = new XYChart(450, 390);

// Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
// Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

// Add a title to the chart using 18pt Times Bold Itatic font.
c.addTitle("Vector Chart Demonstration", "Times New Roman Bold Italic", 18);

// Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Y Axis Title", "Arial Bold Italic", 12);

// Add a title to the x axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("X Axis Title", "Arial Bold Italic", 12);

// Set the axes line width to 3 pixels
c.xAxis().setWidth(3);
c.yAxis().setWidth(3);

// Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to 11
// pixels
c.addVectorLayer(dataX, dataY, dataR, dataA, Chart.YAxisScale, 0x0000cc).setArrowHead(11);

// Output the chart
String chart1URL = c.makeSession(request, "chart1");

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "",
    "title='Vector at ({x}, {value}): Length = {len}, Angle = {dir} deg'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Vector Chart
</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 Version] javademo/vector.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class vector implements DemoModule
{
    //Name of demo program
    public String toString() { return "Vector Chart"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // The (x, y) coordinates of the starting point of the vectors
        double[] dataX = {20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40,
            60, 80, 100, 20, 40, 60, 80, 100};
        double[] dataY = {20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80,
            80, 80, 80, 100, 100, 100, 100, 100};

        // The lengths (radii) and directions (angles) of the vectors
        double[] dataR = {6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6,
            9, 6, 6};
        double[] dataA = {-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120,
            -135, 180, 135, 120, -135, -150, 180, 150, 135};

        // Create a XYChart object of size 450 x 390 pixels
        XYChart c = new XYChart(450, 390);

        // Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
        // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
        // (0xc0c0c0)
        c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

        // Add a title to the chart using 18pt Times Bold Itatic font.
        c.addTitle("Vector Chart Demonstration", "Times New Roman Bold Italic", 18);

        // Add a title to the y axis using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Y Axis Title", "Arial Bold Italic", 12);

        // Add a title to the x axis using 12pt Arial Bold Italic font
        c.xAxis().setTitle("X Axis Title", "Arial Bold Italic", 12);

        // Set the axes line width to 3 pixels
        c.xAxis().setWidth(3);
        c.yAxis().setWidth(3);

        // Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to
        // 11 pixels
        c.addVectorLayer(dataX, dataY, dataR, dataA, Chart.YAxisScale, 0x0000cc).setArrowHead(11);

        // Output the chart
        viewer.setChart(c);

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='Vector at ({x}, {value}): Length = {len}, Angle = {dir} deg'"));
    }

    //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 vector();

        //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().setBackground(Color.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);
    }
}