Rotated Line Chart

This example demonstrates swapping the x and y axes to produce a rotated line chart in which the line goes from top to bottom (instead of left to right).

The x and y axes in the example are configured as follows:

Initially, the x-axis is horizontal from left to right at the bottom of the plot area, while the y-axis is vertical from bottom to top at the left side of the plot area.
Swap the x and y axes using XYChart.swapXY. Now the x-axis is vertical from bottom to top at the left side of the chart, while the y-axis is horizontal from left to right at the bottom of the chart.
Use XYChart.setYAxisOnRight to move the y-axis to the opposite side of the plot area, so that the y-axis is at the top of the plot area. (Note: the "right" word on setYAxisOnRight means the "right" side before "swapXY" rotation. After rotation, the right side will become to top side.)
Use Axis.setReverse to reverse the direction of the x-axis, so that the x-axis is vertical from top to bottom (instead of from bottom to top).

For demo purposes, this example uses RanTable to simulate a database table with 4 columns, in which one is a date/time column and the remaining three are data columns. The date/time column is passed to ChartDirector as the x values using Layer.setXData, while the data columns are passed to ChartDirector as y values using Layer.addDataSet.

[JSP Version] jspdemo/rotatedline.jsp

<%@page import="ChartDirector.*, java.util.*" %>
<%
//
//    We use a random table to simulate generating 12 months of data
//

// Create the random table object with 4 cols * 12 rows, using 3 as seed
RanTable rantable = new RanTable(3, 4, 12);

// Set the 1st column to be the 12 months of year 2002
rantable.setDateCol(0, new GregorianCalendar(2002, 0, 1).getTime(), 86400 * 30);

// Set the 2nd, 3rd and 4th columns to be random numbers starting from 125, 75, and 100
// respectively. The change between rows is set to -35 to + 35. The minimum value of any cell is 0.
rantable.setCol(1, 125, -35, 35, 0);
rantable.setCol(2, 75, -35, 35, 0);
rantable.setCol(3, 100, -35, 35, 0);

// Get the 1st column (time) as the x data
double[] dataX = rantable.getCol(0);

// Get the 2nd, 3rd and 4th columns as 3 data sets
double[] dataY0 = rantable.getCol(1);
double[] dataY1 = rantable.getCol(2);
double[] dataY2 = rantable.getCol(3);

// Create a XYChart object of size 360 x 400 pixels
XYChart c = new XYChart(360, 400);

// Add a title to the chart
c.addTitle("<*underline=2*>Rotated Line Chart Demo", "Times New Roman Bold Italic", 14);

// Set the plotarea at (60, 75) and of size 190 x 320 pixels. Turn on both horizontal and vertical
// grid lines with light grey color (0xc0c0c0)
c.setPlotArea(60, 75, 190, 320).setGridColor(0xc0c0c0, 0xc0c0c0);

// Add a legend box at (270, 75)
c.addLegend(270, 75);

// Swap the x and y axis to become a rotated chart
c.swapXY();

// Set the y axis on the top side (right + rotated = top)
c.setYAxisOnRight();

// Add a title to the y axis
c.yAxis().setTitle("Throughput (MBytes)");

// Reverse the x axis so it is pointing downwards
c.xAxis().setReverse();

// Add a line chart layer using the given data
LineLayer layer = c.addLineLayer2();
layer.setXData(dataX);
layer.addDataSet(dataY0, 0xff0000, "Server A");
layer.addDataSet(dataY1, 0x338033, "Server B");
layer.addDataSet(dataY2, 0x0000ff, "Server C");

// Set the line width to 2 pixels
layer.setLineWidth(2);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "", "title='[{dataSetName}] {x|mm/yyyy}: {value|0} MByte'")
    );
%>
<!DOCTYPE html>
<html>
<head>
    <title>Rotated Line Chart</title>
    <!-- Include ChartDirector Javascript Library to support chart interactions -->
    <script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        Rotated Line Chart
    </div>
    <hr style="border:solid 1px #000080; background:#000080" />
    <div style="font:10pt verdana; margin-bottom:1.5em">
        <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a>
    </div>
    <!-- ****** Here is the chart image ****** -->
    <%= viewer.renderHTML(response) %>
</body>
</html>