This example demonstrates adding custom labels to data points.
- The red circles in this example comes from a scatter layer created using XYChart.addScatterLayer.
- The custom labels in this example is contained in an array variable, and is added as an extra field to the chart using Layer.addExtraField.
- Enable data labels for the data points using Layer.setDataLabelFormat. The data label format is set to showing the extra field.
- Set the font for the data labels to 8 points Arial Bold using Layer.setDataLabelStyle.
- The Layer.setDataLabelStyle method returns a TextBox object representing the prototype of the data labels. In this example, the TextBox object is used to customize the background color, 3D border, position and alignment of the data labels.
[File: phpdemo/scatterlabels.php".]
setPlotArea(55, 40, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);
#Add a title to the chart using 18 pts Times Bold Itatic font.
$c->addTitle("Product Comparison Chart", "timesbi.ttf", 18);
#Add a title to the y axis using 12 pts Arial Bold Italic font
$c->yAxis->setTitle("Capacity (tons)", "arialbi.ttf", 12);
#Add a title to the x axis using 12 pts Arial Bold Italic font
$c->xAxis->setTitle("Range (miles)", "arialbi.ttf", 12);
#Set the axes line width to 3 pixels
$c->xAxis->setWidth(3);
$c->yAxis->setWidth(3);
#Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
$layer = $c->addScatterLayer($dataX, $dataY, "Server BBB", CircleSymbol, 15,
0xff3333, 0xff3333);
#Add labels to the chart as an extra field
$layer->addExtraField($labels);
#Set the data label format to display the extra field
$layer->setDataLabelFormat("{field0}");
#Use 8pts Arial Bold to display the labels
$textbox = $layer->setDataLabelStyle("arialbd.ttf", 8);
#Set the background to purple with a 1 pixel 3D border
$textbox->setBackground(0xcc99ff, Transparent, 1);
#Put the text box 4 pixels to the right of the data point
$textbox->setAlignment(Left);
$textbox->setPos(4, 0);
#output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?> |
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