

This example demonstrates using a log scale axis versus a linear scale axis.
In ChartDirector, log scale axis can be configured using Axis.setLogScale, Axis.setLogScale2 or Axis.setLogScale3.
ChartDirector 6.1 (Java Edition)
Log Scale Axis
Source Code Listing
<%@page import="ChartDirector.*" %> <%@page import="javax.servlet.http.*" %> <%! // A simple structure to represent a chart image with an image map private static class ImageWithHotSpot { String imageURL; String imageMap; } // Function to create the demo charts ImageWithHotSpot createChart(HttpServletRequest request, int chartIndex) { // The data for the chart double[] data = {100, 125, 260, 147, 67}; String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"}; // Create a XYChart object of size 200 x 180 pixels XYChart c = new XYChart(200, 180); // Set the plot area at (30, 10) and of size 140 x 130 pixels c.setPlotArea(30, 10, 140, 130); // Ise log scale axis if required if (chartIndex == 1) { c.yAxis().setLogScale3(); } // Set the labels on the x axis c.xAxis().setLabels(labels); // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars. c.addBarLayer3(data).setBorderColor(-1, 1); // Output the chart ImageWithHotSpot ret = new ImageWithHotSpot(); ret.imageURL = c.makeSession(request, "chart" + chartIndex); // Include tool tip for the chart ret.imageMap = c.getHTMLImageMap("", "", "title='Mileage on {xLabel}: {value} miles'"); return ret; } %> <% ImageWithHotSpot chart0 = createChart(request, 0); ImageWithHotSpot chart1 = createChart(request, 1); %> <html> <body style="margin:5px 0px 0px 5px"> <div style="font-size:18pt; font-family:verdana; font-weight:bold"> Log Scale Axis </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?"+chart0.imageURL)%>' usemap="#map0" border="0"> <map name="map0"><%=chart0.imageMap%></map> <img src='<%=response.encodeURL("getchart.jsp?"+chart1.imageURL)%>' usemap="#map1" border="0"> <map name="map1"><%=chart1.imageMap%></map> </body> </html> |
import java.awt.*; import java.awt.event.*; import javax.swing.*; import ChartDirector.*; public class logaxis implements DemoModule { //Name of demo program public String toString() { return "Log Scale Axis"; } //Number of charts produced in this demo public int getNoOfCharts() { return 2; } //Main code for creating charts public void createChart(ChartViewer viewer, int chartIndex) { // The data for the chart double[] data = {100, 125, 260, 147, 67}; String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"}; // Create a XYChart object of size 200 x 180 pixels XYChart c = new XYChart(200, 180); // Set the plot area at (30, 10) and of size 140 x 130 pixels c.setPlotArea(30, 10, 140, 130); // Ise log scale axis if required if (chartIndex == 1) { c.yAxis().setLogScale3(); } // Set the labels on the x axis c.xAxis().setLabels(labels); // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars. c.addBarLayer3(data).setBorderColor(-1, 1); // Output the chart viewer.setChart(c); //include tool tip for the chart viewer.setImageMap(c.getHTMLImageMap("clickable", "", "title='Mileage on {xLabel}: {value} miles'")); } //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 logaxis(); //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); frame.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT)); frame.setSize(800, 450); // Create the charts and put them in the content pane for (int i = 0; i < demo.getNoOfCharts(); ++i) { ChartViewer viewer = new ChartViewer(); demo.createChart(viewer, i); frame.getContentPane().add(viewer); } // Display the window frame.setVisible(true); } } |