ChartDirector 6.1 (Java Edition)

Continuous Contour Coloring

This example demonstrates continuous coloring of the ContourLayer.

By default, a contour layer will be discretely colored, which means the color will change in discrete steps according to the z level. In continuous coloring, the color will change continuously according to the z level. Continuous coloring can be enabled using ColorAxis.setColorGradient or ColorAxis.setColorScale.

Source Code Listing

[JSP Version] jspdemo/smoothcontour.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 = // Sin(x / 2) * Sin(y / 2). 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] = Math.sin(x / 2.0) * Math.sin(y / 2.0); } } // Create a XYChart object of size 600 x 500 pixels XYChart c = new XYChart(600, 500); // Add a title to the chart using 18 points Times New Roman Bold Italic font c.addTitle("Nano Lattice Twister Field Intensity ", "Times New Roman Bold Italic", 18); // 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("Lattice X Direction (nm)", "Arial Bold Italic", 12); c.yAxis().setTitle("Lattice Y Direction (nm)", "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); // Set the contour color to transparent layer.setContourColor(Chart.Transparent); // Move the grid lines in front of the contour layer c.getPlotArea().moveGridBefore(layer); // Add a color axis (the legend) in which the left center point is anchored at (495, 240). Set the // length to 370 pixels and the labels on the right side. ColorAxis cAxis = layer.setColorAxis(495, 240, Chart.Left, 370, Chart.Right); // Add a bounding box to the color axis using light grey (eeeeee) as the background and dark grey // (444444) as the border. cAxis.setBoundingBox(0xeeeeee, 0x444444); // Add a title to the color axis using 12 points Arial Bold Italic font cAxis.setTitle("Twist Pressure (Twist-Volt)", "Arial Bold Italic", 12); // Set color axis labels to use Arial Bold font cAxis.setLabelStyle("Arial Bold"); // Use smooth gradient coloring cAxis.setColorGradient(true); // Output the chart String chart1URL = c.makeSession(request, "chart1", Chart.JPG); %>
Continuous Contour Coloring

View Source Code
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 ```import java.awt.*; import java.awt.event.*; import javax.swing.*; import ChartDirector.*; public class smoothcontour implements DemoModule { //Name of demo program public String toString() { return "Continuous Contour Coloring"; } //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 = Sin(x / 2) * Sin(y / 2). 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] = Math.sin(x / 2.0) * Math.sin(y / 2.0); } } // Create a XYChart object of size 600 x 500 pixels XYChart c = new XYChart(600, 500); // Add a title to the chart using 18 points Times New Roman Bold Italic font c.addTitle("Nano Lattice Twister Field Intensity ", "Times New Roman Bold Italic", 18 ); // 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("Lattice X Direction (nm)", "Arial Bold Italic", 12); c.yAxis().setTitle("Lattice Y Direction (nm)", "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); // Set the contour color to transparent layer.setContourColor(Chart.Transparent); // Move the grid lines in front of the contour layer c.getPlotArea().moveGridBefore(layer); // Add a color axis (the legend) in which the left center point is anchored at (495, 240). // Set the length to 370 pixels and the labels on the right side. ColorAxis cAxis = layer.setColorAxis(495, 240, Chart.Left, 370, Chart.Right); // Add a bounding box to the color axis using light grey (eeeeee) as the background and dark // grey (444444) as the border. cAxis.setBoundingBox(0xeeeeee, 0x444444); // Add a title to the color axis using 12 points Arial Bold Italic font cAxis.setTitle("Twist Pressure (Twist-Volt)", "Arial Bold Italic", 12); // Set color axis labels to use Arial Bold font cAxis.setLabelStyle("Arial Bold"); // Use smooth gradient coloring cAxis.setColorGradient(true); // 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 smoothcontour(); //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); } }```