ChartDirector 6.1 (Java Edition)

Inter-Line Coloring




This example demonstrates filling the area between two lines or curves.

In ChartDirector, an InterLineLayer can be used to fill the region between any two lines. The lines can be from a LineLayer, StepLineLayer, SplineLayer, TrendLayer, or from an axis Mark. Two colors can be used for filling, depending on which line is on top.

In this example, an InterLineLayer is used to fill the region between a normal line and a spline curve. Another InterLineLayer is used to fill the region between a normal line and a mark line. The fill color differs depending on which line is on top.

Source Code Listing

[JSP Version] jspdemo/linefill.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the line chart
double[] data0 = {70, 73, 80, 90, 95, 93, 82, 77, 82, 101, 111, 115};
double[] data1 = {90, 96, 89, 77, 82, 96, 109, 109, 99, 108, 96, 91};
double[] data2 = {58, 34, 25, 49, 64, 10, 16, 40, 25, 49, 40, 22};

// The labels for the line chart
String[] labels = {"2008-01", "2008-02", "2008-03", "2008-04", "2008-05", "2008-06", "2008-07",
    "2008-08", "2008-09", "2008-10", "2008-11", "2008-12"};

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

// Add a title to the chart using 15pt Arial Italic font.
TextBox title = c.addTitle("Inter-line Coloring", "Arial Italic", 15);

// Add a legend box where the top-center is anchored to the horizontal center of the chart, just
// under the title. Use horizontal layout and 10 points Arial Bold font, and transparent background
// and border. Use line style legend key.
LegendBox legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), false, "Arial Bold Italic",
    10);
legendBox.setBackground(Chart.Transparent, Chart.Transparent);
legendBox.setAlignment(Chart.TopCenter);
legendBox.setLineStyleKey();

// Tentatively set the plotarea at (70, 65) and of (chart_width - 100) x (chart_height - 110) in
// size. Use light grey (c0c0c0) border and horizontal and vertical grid lines.
PlotArea plotArea = c.setPlotArea(70, 65, c.getWidth() - 100, c.getHeight() - 110, -1, -1, 0xc0c0c0,
    0xc0c0c0, -1);

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

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

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

// Set the labels on the x axis.
c.xAxis().setLabels(labels);

// Use 8 points Arial rotated by 90 degrees as the x-axis label font
c.xAxis().setLabelStyle("Arial", 8, Chart.TextColor, 90);

// Add a spline curve to the chart
SplineLayer layer0 = c.addSplineLayer(data0, 0xff0000, "Data Set 0");
layer0.setLineWidth(2);

// Add a normal line to the chart
LineLayer layer1 = c.addLineLayer(data1, 0x008800, "Data Set 1");
layer1.setLineWidth(2);

// Color the region between the above spline curve and normal line. Use the semi-transparent red
// (80ff000000) if the spline curve is higher than the normal line, otherwise use semi-transparent
// green (80008800)
c.addInterLineLayer(layer0.getLine(), layer1.getLine(), 0x80ff0000, 0x80008800);

// Add another normal line to the chart
LineLayer layer2 = c.addLineLayer(data2, 0x0000ff, "Data Set 2");
layer2.setLineWidth(2);

// Add a horizontal mark line to the chart at y = 40
Mark mark = c.yAxis().addMark(40, -1, "Threshold");
mark.setLineWidth(2);

// Set the mark line to purple (880088) dash line. Use white (ffffff) for the mark label.
mark.setMarkColor(c.dashLineColor(0x880088), 0xffffff);

// Put the mark label at the left side of the mark, with a purple (880088) background.
mark.setAlignment(Chart.Left);
mark.setBackground(0x880088);

// Color the region between the above normal line and mark line. Use the semi-transparent blue
// (800000ff) if the normal line is higher than the mark line, otherwise use semi-transparent purple
// (80880088)
c.addInterLineLayer(layer2.getLine(), mark.getLine(), 0x800000ff, 0x80880088);

// Layout the legend box, so we can get its height
c.layoutLegend();

// Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels from the
// left edge, just under the legend box, 25 pixels from the right edge, and 10 pixels from the
// bottom edge.
c.packPlotArea(10, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() - 25, c.getHeight() -
    10);

// After determining the exact plot area position, we may adjust the legend box and the title
// positions so that they are centered relative to the plot area (instead of the chart)
legendBox.setPos(plotArea.getLeftX() + (plotArea.getWidth() - legendBox.getWidth()) / 2,
    legendBox.getTopY());
title.setPos(plotArea.getLeftX() + (plotArea.getWidth() - title.getWidth()) / 2, title.getTopY());

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

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "", "title='{dataSetName} in {xLabel}: {value}'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Inter-Line Coloring
</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/linefill.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class linefill implements DemoModule
{
    //Name of demo program
    public String toString() { return "Inter-Line 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 data for the line chart
        double[] data0 = {70, 73, 80, 90, 95, 93, 82, 77, 82, 101, 111, 115};
        double[] data1 = {90, 96, 89, 77, 82, 96, 109, 109, 99, 108, 96, 91};
        double[] data2 = {58, 34, 25, 49, 64, 10, 16, 40, 25, 49, 40, 22};

        // The labels for the line chart
        String[] labels = {"2008-01", "2008-02", "2008-03", "2008-04", "2008-05", "2008-06",
            "2008-07", "2008-08", "2008-09", "2008-10", "2008-11", "2008-12"};

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

        // Add a title to the chart using 15pt Arial Italic font.
        TextBox title = c.addTitle("Inter-line Coloring", "Arial Italic", 15);

        // Add a legend box where the top-center is anchored to the horizontal center of the chart,
        // just under the title. Use horizontal layout and 10 points Arial Bold font, and
        // transparent background and border. Use line style legend key.
        LegendBox legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), false,
            "Arial Bold Italic", 10);
        legendBox.setBackground(Chart.Transparent, Chart.Transparent);
        legendBox.setAlignment(Chart.TopCenter);
        legendBox.setLineStyleKey();

        // Tentatively set the plotarea at (70, 65) and of (chart_width - 100) x (chart_height -
        // 110) in size. Use light grey (c0c0c0) border and horizontal and vertical grid lines.
        PlotArea plotArea = c.setPlotArea(70, 65, c.getWidth() - 100, c.getHeight() - 110, -1, -1,
            0xc0c0c0, 0xc0c0c0, -1);

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

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

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

        // Set the labels on the x axis.
        c.xAxis().setLabels(labels);

        // Use 8 points Arial rotated by 90 degrees as the x-axis label font
        c.xAxis().setLabelStyle("Arial", 8, Chart.TextColor, 90);

        // Add a spline curve to the chart
        SplineLayer layer0 = c.addSplineLayer(data0, 0xff0000, "Data Set 0");
        layer0.setLineWidth(2);

        // Add a normal line to the chart
        LineLayer layer1 = c.addLineLayer(data1, 0x008800, "Data Set 1");
        layer1.setLineWidth(2);

        // Color the region between the above spline curve and normal line. Use the semi-transparent
        // red (80ff000000) if the spline curve is higher than the normal line, otherwise use
        // semi-transparent green (80008800)
        c.addInterLineLayer(layer0.getLine(), layer1.getLine(), 0x80ff0000, 0x80008800);

        // Add another normal line to the chart
        LineLayer layer2 = c.addLineLayer(data2, 0x0000ff, "Data Set 2");
        layer2.setLineWidth(2);

        // Add a horizontal mark line to the chart at y = 40
        Mark mark = c.yAxis().addMark(40, -1, "Threshold");
        mark.setLineWidth(2);

        // Set the mark line to purple (880088) dash line. Use white (ffffff) for the mark label.
        mark.setMarkColor(c.dashLineColor(0x880088), 0xffffff);

        // Put the mark label at the left side of the mark, with a purple (880088) background.
        mark.setAlignment(Chart.Left);
        mark.setBackground(0x880088);

        // Color the region between the above normal line and mark line. Use the semi-transparent
        // blue (800000ff) if the normal line is higher than the mark line, otherwise use
        // semi-transparent purple (80880088)
        c.addInterLineLayer(layer2.getLine(), mark.getLine(), 0x800000ff, 0x80880088);

        // Layout the legend box, so we can get its height
        c.layoutLegend();

        // Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels
        // from the left edge, just under the legend box, 25 pixels from the right edge, and 10
        // pixels from the bottom edge.
        c.packPlotArea(10, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() - 25,
            c.getHeight() - 10);

        // After determining the exact plot area position, we may adjust the legend box and the
        // title positions so that they are centered relative to the plot area (instead of the
        // chart)
        legendBox.setPos(plotArea.getLeftX() + (plotArea.getWidth() - legendBox.getWidth()) / 2,
            legendBox.getTopY());
        title.setPos(plotArea.getLeftX() + (plotArea.getWidth() - title.getWidth()) / 2,
            title.getTopY());

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='{dataSetName} in {xLabel}: {value}'"));
    }

    //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 linefill();

        //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);
    }
}