Heat Map Cell Labels

[JSP Version] jspdemo/heatmapcelllabels.jsp
<%@page import="ChartDirector.*, java.util.*" %>
<%
// The x-axis and y-axis labels
String[] xLabels = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J"};
String[] yLabels = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};

// Random data for the 10 x 10 cells
RanSeries rand = new RanSeries(2);
double[] zData = rand.get2DSeries(xLabels.length, yLabels.length, 0, 100);

// We set the middle 5 x 5 cells to NoValue to remove them from the chart
for(int x = 3; x < 7; ++x) {
    for(int y = 3; y < 7; ++y) {
        zData[y * xLabels.length + x] = Chart.NoValue;
    }
}

// Create an XYChart object of size 480 x 540 pixels.
XYChart c = new XYChart(480, 540);

// Set the plotarea at (50, 40) and of size 400 x 400 pixels. Set the background, border, and grid
// lines to transparent.
PlotArea p = c.setPlotArea(50, 40, 400, 400, -1, -1, Chart.Transparent, Chart.Transparent);

// Create a discrete heat map with 10 x 10 cells
DiscreteHeatMapLayer layer = c.addDiscreteHeatMapLayer(zData, xLabels.length);

// Set the x-axis labels. Use 8pt Arial Bold font. Set axis stem to transparent, so only the labels
// are visible. Set 0.5 offset to position the labels in between the grid lines. Position the x-axis
// at the top of the chart.
c.xAxis().setLabels(xLabels);
c.xAxis().setLabelStyle("Arial Bold", 8);
c.xAxis().setColors(Chart.Transparent, Chart.TextColor);
c.xAxis().setLabelOffset(0.5);
c.xAxis().setTitle("X axis title placeholder", "Arial Bold", 12);
c.setXAxisOnTop();

// Set the y-axis labels. Use 8pt Arial Bold font. Set axis stem to transparent, so only the labels
// are visible. Set 0.5 offset to position the labels in between the grid lines. Reverse the y-axis
// so that the labels are flowing top-down instead of bottom-up.
c.yAxis().setLabels(yLabels);
c.yAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setColors(Chart.Transparent, Chart.TextColor);
c.yAxis().setLabelOffset(0.5);
c.yAxis().setTitle("Y axis title placeholder", "Arial Bold", 12);
c.yAxis().setReverse();

// Set a 3-pixel gap between cells
layer.setCellGap(3);

// Use the z value as the cell label
layer.setDataLabelFormat("{z|0}");

// Position the color axis 20 pixels below the plot area and of the width as the plot area. Put the
// labels at the bottom side of the color axis. Use 8pt Arial Bold font for the labels.
ColorAxis cAxis = layer.setColorAxis(p.getLeftX(), p.getBottomY() + 20, Chart.TopLeft, p.getWidth(),
    Chart.Bottom);
cAxis.setLabelStyle("Arial Bold", 8);
cAxis.setTitle("Color legend title placeholder", "Arial Bold", 12);

// Set the color stops and scale of the color axis
double[] colorScale = {0, 0x00ff00, 50, 0xffff00, 80, 0xff6600, 100, 0xff0000};
cAxis.setColorScale(colorScale);
cAxis.setLinearScale(0, 100, 10);

// 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='<*cdml*>({xLabel}, {yLabel}) = {z|2}'"));
%>
<!DOCTYPE html>
<html>
<head>
    <title>Heat Map Cell Labels</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;">
        Heat Map Cell Labels
    </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>