This example demonstratea a polar line chart, completed with data symbols and data labels.

• The grid lines in this example is circular (instead of polygonal as is in Simple Radar Chart). This is configured using PolarChart.setGridStyle.
  
  
• The angular scale in this example is set to 0 - 360, with spokes every 30 units. This is by using AngularAxis.setLinearScale.
  
  
• The two lines in this example is added using PolarChart.addLineLayer with angular coordinates of the points provided by PolarLayer.setAngles.
  
  
• The data symbols are enabled using PolarLayer.setDataSymbol.
  
  
• The data labels are configured using PolarLayer.setDataLabelFormat to consist of the radial and angular coordinates.
  
  
• The data label background colors and 3D borders are configured using PolarLayer.setDataLabelStyle and Box.setBackground.
  
  
• Note that the blue line in this example is a closed loop (the default), while the red is not a loop. This is configured by using PolarLineLayer.setCloseLoop.

[File: phpdemo/polarline.php".]

<?php require_once("../lib/phpchartdir.php"); #The data for the chart $data0 = array(90, 25, 40, 55, 68, 44, 79, 85, 50); $angles0 = array(15, 60, 110, 180, 230, 260, 260, 310, 340); $data1 = array(80, 91, 66, 80, 92, 87); $angles1 = array(40, 65, 88, 110, 150, 200); #Create a PolarChart object of size 460 x 460 pixels $c = new PolarChart(460, 460); #Add a title to the chart at the top left corner using 15pts Arial Bold Italic #font $c->addTitle2(TopLeft, "<*underline=2*>Polar Line Chart Demo", "arialbi.ttf", 15 ); #Set center of plot area at (230, 240) with radius 180 pixels $c->setPlotArea(230, 240, 180); #Set the grid style to circular grid, with grids below the chart layers $c->setGridStyle(false, false); #Add a legend box at the top right corner of the chart using 9 pts Arial Bold #font $legendObj = $c->addLegend(459, 0, true, "arialbd.ttf", 9); $legendObj->setAlignment(TopRight); #Set angular axis as 0 - 360, either spoke every 30 units $angularAxisObj = $c->angularAxis(); $angularAxisObj->setLinearScale(0, 360, 30); #Add a blue (0xff) line layer to the chart using (data0, angle0) $layer0 = $c->addLineLayer($data0, 0xff, "Close Loop Line"); $layer0->setAngles($angles0); #Set the line width to 2 pixels $layer0->setLineWidth(2); #Use 11 pixel triangle symbols for the data points $layer0->setDataSymbol(TriangleSymbol, 11); #Enable data label and set its format $layer0->setDataLabelFormat("({value},{angle})"); #Set the data label text box with light blue (0x9999ff) backgruond color and 1 #pixel 3D border effect $dataLabelStyleObj = $layer0->setDataLabelStyle(); $dataLabelStyleObj->setBackground(0x9999ff, Transparent, 1); #Add a red (0xff0000) line layer to the chart using (data1, angle1) $layer1 = $c->addLineLayer($data1, 0xff0000, "Open Loop Line"); $layer1->setAngles($angles1); #Set the line width to 2 pixels $layer1->setLineWidth(2); #Use 11 pixel diamond symbols for the data points $layer1->setDataSymbol(DiamondSymbol, 11); #Set the line to open loop $layer1->setCloseLoop(false); #Enable data label and set its format $layer1->setDataLabelFormat("({value},{angle})"); #Set the data label text box with light red (0xff9999) backgruond color and 1 #pixel 3D border effect $dataLabelStyleObj = $layer1->setDataLabelStyle(); $dataLabelStyleObj->setBackground(0xff9999, Transparent, 1); #output the chart header("Content-type: image/png"); print($c->makeChart2(PNG)); ?>