Pos/Neg Waterfall Chart

[JSP Version] jspdemo/posnegwaterfall.jsp
<%@page import="ChartDirector.*, java.util.*" %>
<%
// 4 data points to represent the cash flow for the Q1 - Q4
double[] data = {230, -140, 220, 330};

// We want to plot a waterfall chart showing the 4 quarters as well as the total
String[] labels = {"1st Quarter", "2nd Quarter", "3rd Quarter", "4th Quarter", "Total"};

// The top side of the bars in a waterfall chart is the accumulated data. We use the ChartDirector
// ArrayMath utility to accumulate the data. The "total" is handled by inserting a zero point at the
// end before accumulation (after accumulation it will become the total).
double[] boxTop = new ArrayMath(data).insert2(0, 1, data.length).acc().result();

// The botom side of the bars is just the top side of the previous bar. So we shifted the top side
// data to obtain the bottom side data.
double[] boxBottom = new ArrayMath(boxTop).shift(1, 0).result();

// The last point (total) is different. Its bottom side is always 0.
boxBottom[boxBottom.length - 1] = 0;

// In this example, we want to use different colors depending on the data is positive or negative.
int posColor = 0x00ff00;
int negColor = 0xff0000;

// Create a XYChart object of size 500 x 280 pixels. Set background color to light blue (ccccff),
// with 1 pixel 3D border effect.
XYChart c = new XYChart(500, 300, 0xccccff, 0x000000, 1);

// Add a title to the chart using 13 points Arial Bold Itatic font, with white (ffffff) text on a
// deep blue (0x80) background
c.addTitle("Corporate Cash Flow - Year 2004", "Arial Bold Italic", 13, 0xffffff).setBackground(
    0x000080);

// Set the plotarea at (55, 50) and of size 430 x 215 pixels. Use alternative white/grey background.
c.setPlotArea(55, 50, 430, 215, 0xffffff, 0xeeeeee);

// Add a legend box at (55, 25) using 8pt Arial Bold font with horizontal layout, with transparent
// background and border color.
LegendBox b = c.addLegend(55, 25, false, "Arial Bold", 8);
b.setBackground(Chart.Transparent, Chart.Transparent);

// Add keys to show the colors for positive and negative cash flows
b.addKey("Positive Cash Flow", posColor);
b.addKey("Negative Cash Flow", negColor);

// Set the labels on the x axis using Arial Bold font
c.xAxis().setLabels(labels).setFontStyle("Arial Bold");

// Set the x-axis ticks and grid lines to be between the bars
c.xAxis().setTickOffset(0.5);

// Use Arial Bold as the y axis label font
c.yAxis().setLabelStyle("Arial Bold");

// Add a title to the y axis
c.yAxis().setTitle("USD (in millions)");

// Add a box-whisker layer to represent the waterfall bars
BoxWhiskerLayer layer = c.addBoxWhiskerLayer(boxTop, boxBottom);

// Color the bars depending on whether it is positive or negative
for(int i = 0; i < boxTop.length; ++i) {
    if (boxTop[i] >= boxBottom[i]) {
        layer.setBoxColor(i, posColor);
    } else {
        layer.setBoxColor(i, negColor);
    }
}

// Put data labels on the bars to show the cash flow using Arial Bold font
layer.setDataLabelFormat("{={top}-{bottom}}M");
layer.setDataLabelStyle("Arial Bold").setAlignment(Chart.Center);

// 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='{xLabel}: {={top}-{bottom}} millions'"));
%>
<!DOCTYPE html>
<html>
<head>
    <title>Pos/Neg Waterfall 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;">
        Pos/Neg Waterfall 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>