ChartDirector 7.0 (PHP Edition)

Percentage Bar Chart




This example demonstrates creating a percentage bar chart with a legend box. It also demonstrates gradient background color, rounded frame, soft drop shadow, and using CDML to include custom icons in the legend box.

A percentage bar chart is like a stacked bar chart, except the bars are individually scaled so that they stacked up to 100.

The key features demonstrated in this example are:

Note that by default, the data label format is {percent}% (showing the percentage) for a percentage bar layer, as opposed to {value} (showing the data value) for other types of bar layer. The data label format can be modified using Layer.setDataLabelFormat.

Source Code Listing

[File: phpdemo/percentbar.php]
<?php require_once("../lib/phpchartdir.php"); # The data for the bar chart $data0 = array(100, 125, 245, 147, 67); $data1 = array(85, 156, 179, 211, 123); $data2 = array(97, 87, 56, 267, 157); # The labels for the bar chart $labels = array("Mon", "Tue", "Wed", "Thu", "Fri"); # Create a XYChart object of size 500 x 320 pixels. Use a vertical gradient color from pale blue # (e8f0f8) to sky blue (aaccff) spanning half the chart height as background. Set border to blue # (88aaee). Use rounded corners. Enable soft drop shadow. $c = new XYChart(500, 320); $c->setBackground($c->linearGradientColor(0, 0, 0, $c->getHeight() / 2, 0xe8f0f8, 0xaaccff), 0x88aaee); $c->setRoundedFrame(); $c->setDropShadow(); # Set directory for loading images to current script directory # Need when running under Microsoft IIS $c->setSearchPath(dirname(__FILE__)); # Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to 15 pixels. $title = $c->addTitle("Weekly Product Sales", "Arial Italic", 15); $title->setMargin2(0, 0, 15, 15); # Tentatively set the plotarea to 50 pixels from the left edge, and to just under the title. Set the # width to 60% of the chart width, and the height to 50 pixels from the bottom edge. Use pale blue # (e8f0f8) background, transparent border, and grey (aaaaaa) grid lines. $c->setPlotArea(50, $title->getHeight(), $c->getWidth() * 6 / 10, $c->getHeight() - $title->getHeight() - 50, 0xe8f0f8, -1, Transparent, 0xaaaaaa); # Add a legend box where the top-right corner is anchored at 10 pixels from the right edge, and just # under the title. Use vertical layout and 8 points Arial font. $legendBox = $c->addLegend($c->getWidth() - 10, $title->getHeight(), true, "Arial", 8); $legendBox->setAlignment(TopRight); # Set the legend box background and border to transparent $legendBox->setBackground(Transparent, Transparent); # Set the legend box icon size to 16 x 32 pixels to match with custom icon size $legendBox->setKeySize(16, 32); # Set axes to transparent $c->xAxis->setColors(Transparent); $c->yAxis->setColors(Transparent); # Set the labels on the x axis $c->xAxis->setLabels($labels); # Add a percentage bar layer $layer = $c->addBarLayer2(Percentage); # Add the three data sets to the bar layer, using icons images with labels as data set names $layer->addDataSet($data0, 0x66aaee, "<*block,valign=absmiddle*><*img=service.png*> Service<*/*>"); $layer->addDataSet($data1, 0xeebb22, "<*block,valign=absmiddle*><*img=software.png*> Software<*/*>") ; $layer->addDataSet($data2, 0xcc88ff, "<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>") ; # Use soft lighting effect with light direction from top $layer->setBorderColor(Transparent, softLighting(Top)); # Enable data label at the middle of the the bar $layer->setDataLabelStyle()->setAlignment(Center); # For a vertical stacked chart with positive data only, the last data set is always on top. However, # in a vertical legend box, the last data set is at the bottom. This can be reversed by using the # setLegend method. $layer->setLegend(ReverseLegend); # Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels from the # left edge, just below the title, 10 pixels to the right of the legend box, and 15 pixels from the # bottom edge. $c->packPlotArea(15, $title->getHeight(), $c->layoutLegend()->getLeftX() - 10, $c->getHeight() - 15) ; # Output the chart $viewer = new WebChartViewer("chart1"); $viewer->setChart($c, SVG); # Include tool tip for the chart $viewer->setImageMap($c->getHTMLImageMap("", "", "title='{dataSetName} revenue on {xLabel}: US\${value}K ({percent}%)'")); ?> <!DOCTYPE html> <html> <head> <title>Percentage 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;"> Percentage Bar Chart </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <?php echo $viewer->renderHTML(); ?> </body> </html>