This example demonstrates a multi-bar chart with glass shading effect for bars and gradient color for plot area background.
Glass lighting is a complex shading effect that gives a look and feel of tinted glass or semi-transparent plastic material. This effect involves glare and variation of lighting caused by reflection and refraction inside the material.
[JSP Version] jspdemo/glassmultibar.jsp
<%@page import="ChartDirector.*, java.util.*" %>
<%
// The data for the bar chart
double[] data0 = {100, 125, 245, 147, 67};
double[] data1 = {85, 156, 179, 211, 123};
double[] data2 = {97, 87, 56, 267, 157};
String[] labels = {"Mon", "Tue", "Wed", "Thur", "Fri"};
// Create a XYChart object of size 540 x 375 pixels
XYChart c = new XYChart(540, 375);
// Add a title to the chart using 18pt Times Bold Italic font
c.addTitle("Average Weekly Network Load", "Times New Roman Bold Italic", 18);
// Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color from
// light blue (f9f9ff) to blue (6666ff) as background. Set border and grid lines to white (ffffff).
c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0xf9f9ff, 0x6666ff), -1,
0xffffff, 0xffffff);
// Add a legend box at (50, 28) using horizontal layout. Use 10pt Arial Bold as font, with
// transparent background.
c.addLegend(50, 28, false, "Arial Bold", 10).setBackground(Chart.Transparent);
// Set the x axis labels
c.xAxis().setLabels(labels);
// Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5);
// Set axis label style to 8pt Arial Bold
c.xAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setLabelStyle("Arial Bold", 8);
// Set axis line width to 2 pixels
c.xAxis().setWidth(2);
c.yAxis().setWidth(2);
// Add axis title
c.yAxis().setTitle("Throughput (MBytes Per Hour)");
// Add a multi-bar layer with 3 data sets
BarLayer layer = c.addBarLayer2(Chart.Side);
layer.addDataSet(data0, 0xff0000, "Server #1");
layer.addDataSet(data1, 0x00ff00, "Server #2");
layer.addDataSet(data2, 0xff8800, "Server #3");
// Set bar border to transparent. Use glass lighting effect with light direction from left.
layer.setBorderColor(Chart.Transparent, Chart.glassEffect(Chart.NormalGlare, Chart.Left));
// Configure the bars within a group to touch each others (no gap)
layer.setBarGap(0.2, Chart.TouchBar);
// 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} on {xLabel}: {value} MBytes/hour'"));
%>
<!DOCTYPE html>
<html>
<head>
<title>Glass Multi-Bar 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;">
Glass Multi-Bar 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>
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