A polar scatter chart can be created as a polar line chart with data symbols enabled. The line width is set to 0, so only the symbols can be seen. This will create the effects of a scatter chart.
The detail steps are:
[File: phpdemo/polarscatter.php".]
addTitle2(TopLeft, "<*underline=2*>Plants in Wonderland", "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
$c->setGridStyle(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 8 spokes
$angularAxisObj = $c->angularAxis();
$angularAxisObj->setLinearScale2(0, 360, $labels);
#Set the radial axis label format
$radialAxisObj = $c->radialAxis();
$radialAxisObj->setLabelFormat("{value} km");
#Add a blue (0xff) polar line layer to the chart using (data0, angle0)
$layer0 = $c->addLineLayer($data0, 0xff, "Immortal Weed");
$layer0->setAngles($angles0);
$layer0->setLineWidth(0);
$layer0->setDataSymbol(TriangleSymbol, 11);
#Add a red (0xff0000) polar line layer to the chart using (data1, angles1)
$layer1 = $c->addLineLayer($data1, 0xff0000, "Precious Flower");
$layer1->setAngles($angles1);
#Disable the line by setting its width to 0, so only the symbols are visible
$layer1->setLineWidth(0);
#Use a 11 pixel diamond data point symbol
$layer1->setDataSymbol(DiamondSymbol, 11);
#Add a green (0x00ff00) polar line layer to the chart using (data2, angles2)
$layer2 = $c->addLineLayer($data2, 0xff00, "Magical Tree");
$layer2->setAngles($angles2);
#Disable the line by setting its width to 0, so only the symbols are visible
$layer2->setLineWidth(0);
#Use a 9 pixel square data point symbol
$layer2->setDataSymbol(SquareSymbol, 9);
#output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?> |
© 2004 Advanced Software Engineering Limited. All rights reserved.