ChartDirector 6.1 (Java Edition)

Polar Vector Chart

This example demonstrates a polar 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 radial and angular coordinates, and the length and the direction.

In ChartDirector, a polar vector layer is created using PolarChart.addVectorLayer.

Source Code Listing

[JSP Version] jspdemo/polarvector.jsp
 ```<%@page import="ChartDirector.*" %> <% // Coordinates of the starting points of the vectors double[] radius = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25}; double[] angle = {0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330}; // Magnitude and direction of the vectors double[] magnitude = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}; double[] direction = {60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30}; // Create a PolarChart object of size 460 x 460 pixels PolarChart c = new PolarChart(460, 460); // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font c.addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15); // Set center of plot area at (230, 240) with radius 180 pixels c.setPlotArea(230, 240, 180); // Set the grid style to circular grid c.setGridStyle(false); // Set angular axis as 0 - 360, with a spoke every 30 units c.angularAxis().setLinearScale(0, 360, 30); // Add a polar vector layer to the chart with blue (0000ff) vectors c.addVectorLayer(radius, angle, magnitude, direction, Chart.RadialAxisScale, 0x0000ff); // Output the chart String chart1URL = c.makeSession(request, "chart1"); // Include tool tip for the chart String imageMap1 = c.getHTMLImageMap("", "", "title='Vector at ({value}, {angle} deg): Length = {len}, Angle = {dir} deg'"); %>
Polar Vector Chart

View Source Code
<%=imageMap1%> ```

 ```import java.awt.*; import java.awt.event.*; import javax.swing.*; import ChartDirector.*; public class polarvector implements DemoModule { //Name of demo program public String toString() { return "Polar 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) { // Coordinates of the starting points of the vectors double[] radius = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25}; double[] angle = {0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330}; // Magnitude and direction of the vectors double[] magnitude = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}; double[] direction = {60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30}; // Create a PolarChart object of size 460 x 460 pixels PolarChart c = new PolarChart(460, 460); // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font c.addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15); // Set center of plot area at (230, 240) with radius 180 pixels c.setPlotArea(230, 240, 180); // Set the grid style to circular grid c.setGridStyle(false); // Set angular axis as 0 - 360, with a spoke every 30 units c.angularAxis().setLinearScale(0, 360, 30); // Add a polar vector layer to the chart with blue (0000ff) vectors c.addVectorLayer(radius, angle, magnitude, direction, Chart.RadialAxisScale, 0x0000ff); // Output the chart viewer.setChart(c); //include tool tip for the chart viewer.setImageMap(c.getHTMLImageMap("clickable", "", "title='Vector at ({value}, {angle} deg): 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 polarvector(); //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); } }```