ChartDirector 6.1 (Java Edition)

Contour Chart

This example demonstrates creating a contour chart.

• The contour chart is created by adding a ContourLayer to the chart using XYChart.addContourLayer.

• By default, grid lines are drawn at the background of the plot area and so are behind all chart layers. In this example, PlotArea.moveGridBefore is used to move the grid lines in front of the contour layer.

• The color axis (visually represented as the color legend) is positioned vertically to the right of the plot area using ContourLayer.setColorAxis.

Source Code Listing

[JSP Version] jspdemo/contour.jsp
 ```<%@page import="ChartDirector.*" %> <% // The x and y coordinates of the grid double[] dataX = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; double[] dataY = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; // The values at the grid points. In this example, we will compute the values using the formula z = // x * sin(y) + y * sin(x). double[] dataZ = new double[dataX.length * dataY.length]; for (int yIndex = 0; yIndex < dataY.length; ++yIndex) { double y = dataY[yIndex]; for (int xIndex = 0; xIndex < dataX.length; ++xIndex) { double x = dataX[xIndex]; dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x); } } // Create a XYChart object of size 600 x 500 pixels XYChart c = new XYChart(600, 500); // Add a title to the chart using 15 points Arial Bold Italic font c.addTitle("z = x * sin(y) + y * sin(x) ", "Arial Bold Italic", 15); // Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black (80000000) // dotted lines for both horizontal and vertical grid lines c.setPlotArea(75, 40, 400, 400, -1, -1, -1, c.dashLineColor(0x80000000, Chart.DotLine), -1); // Set x-axis and y-axis title using 12 points Arial Bold Italic font c.xAxis().setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 12); c.yAxis().setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 12); // Set x-axis and y-axis labels to use Arial Bold font c.xAxis().setLabelStyle("Arial Bold"); c.yAxis().setLabelStyle("Arial Bold"); // When auto-scaling, use tick spacing of 40 pixels as a guideline c.yAxis().setTickDensity(40); c.xAxis().setTickDensity(40); // Add a contour layer using the given data ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ); // Move the grid lines in front of the contour layer c.getPlotArea().moveGridBefore(layer); // Add a color axis (the legend) in which the top left corner is anchored at (505, 40). Set the // length to 400 pixels and the labels on the right side. ColorAxis cAxis = layer.setColorAxis(505, 40, Chart.TopLeft, 400, Chart.Right); // Add a title to the color axis using 12 points Arial Bold Italic font cAxis.setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 12); // Set color axis labels to use Arial Bold font cAxis.setLabelStyle("Arial Bold"); // Output the chart String chart1URL = c.makeSession(request, "chart1"); %>
Contour Chart

View Source Code
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 ```import java.awt.*; import java.awt.event.*; import javax.swing.*; import ChartDirector.*; public class contour implements DemoModule { //Name of demo program public String toString() { return "Contour 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 and y coordinates of the grid double[] dataX = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} ; double[] dataY = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} ; // The values at the grid points. In this example, we will compute the values using the // formula z = x * sin(y) + y * sin(x). double[] dataZ = new double[dataX.length * dataY.length]; for (int yIndex = 0; yIndex < dataY.length; ++yIndex) { double y = dataY[yIndex]; for (int xIndex = 0; xIndex < dataX.length; ++xIndex) { double x = dataX[xIndex]; dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x); } } // Create a XYChart object of size 600 x 500 pixels XYChart c = new XYChart(600, 500); // Add a title to the chart using 15 points Arial Bold Italic font c.addTitle("z = x * sin(y) + y * sin(x) ", "Arial Bold Italic", 15); // Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black // (80000000) dotted lines for both horizontal and vertical grid lines c.setPlotArea(75, 40, 400, 400, -1, -1, -1, c.dashLineColor(0x80000000, Chart.DotLine), -1); // Set x-axis and y-axis title using 12 points Arial Bold Italic font c.xAxis().setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 12); c.yAxis().setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 12); // Set x-axis and y-axis labels to use Arial Bold font c.xAxis().setLabelStyle("Arial Bold"); c.yAxis().setLabelStyle("Arial Bold"); // When auto-scaling, use tick spacing of 40 pixels as a guideline c.yAxis().setTickDensity(40); c.xAxis().setTickDensity(40); // Add a contour layer using the given data ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ); // Move the grid lines in front of the contour layer c.getPlotArea().moveGridBefore(layer); // Add a color axis (the legend) in which the top left corner is anchored at (505, 40). Set // the length to 400 pixels and the labels on the right side. ColorAxis cAxis = layer.setColorAxis(505, 40, Chart.TopLeft, 400, Chart.Right); // Add a title to the color axis using 12 points Arial Bold Italic font cAxis.setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 12); // Set color axis labels to use Arial Bold font cAxis.setLabelStyle("Arial Bold"); // Output the chart viewer.setChart(c); } //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 contour(); //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); } }```