A multi-bar chart is a bar chart in which multiple data sets are represented by drawing the bars side by side in a cluster. The multi-bar layer is created by using
XYChart.addBarLayer2 with the
Side pre-defined constant.
This example employs two alternative colors as the plot area background. This is achieved by using
PlotArea.setBackground.
In this example, a margin is configured at the top of the plot area for the legend keys. This is achieved by using
Axis.setMargin.
[File: phpdemo/multibar.php".]
addTitle(" Average Weekday Network Load", "", 10);
#Set the plot area at (45, 25) and of size 239 x 180. Use two alternative
#background colors (0xffffc0 and 0xffffe0)
$plotAreaObj = $c->setPlotArea(45, 25, 239, 180);
$plotAreaObj->setBackground(0xffffc0, 0xffffe0);
#Add a legend box at (45, 20) using horizontal layout. Use 8 pt Arial font, with
#transparent background
$legendObj = $c->addLegend(45, 20, false, "", 8);
$legendObj->setBackground(Transparent);
#Add a title to the y-axis
$c->yAxis->setTitle("Throughput (MBytes Per Hour)");
#Reserve 20 pixels at the top of the y-axis for the legend box
$c->yAxis->setTopMargin(20);
#Set the x axis labels
$c->xAxis->setLabels($labels);
#Add a multi-bar layer with 3 data sets
$layer = $c->addBarLayer2(Side, 3);
$layer->addDataSet($data0, 0xff8080, "Server #1");
$layer->addDataSet($data1, 0x80ff80, "Server #2");
$layer->addDataSet($data2, 0x8080ff, "Server #3");
#output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?> |
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