# Drawing a polar chart

[Reference](http://wiki.pchart.net/doc.draw.polar.html)

```php
require '/path/to/your/vendor/autoload.php';

use CpChart\Chart\Data;
use CpChart\Chart\Image;
use CpChart\Chart\Radar;

/* Create and populate the Data object */
$data = new Data();
$data->addPoints([10, 20, 30, 40, 50, 60, 70, 80, 90], "ScoreA");
$data->addPoints([20, 40, 50, 12, 10, 30, 40, 50, 60], "ScoreB");
$data->setSerieDescription("ScoreA", "Coverage A");
$data->setSerieDescription("ScoreB", "Coverage B");

/* Define the absissa serie */
$data->addPoints([40, 80, 120, 160, 200, 240, 280, 320, 360], "Coord");
$data->setAbscissa("Coord");

/* Create the Image object */
$image = new Image(700, 230, $data);

/* Draw a solid background */
$settings = ["R" => 179, "G" => 217, "B" => 91, "Dash" => 1, "DashR" => 199, "DashG" => 237, "DashB" => 111];
$image->drawFilledRectangle(0, 0, 700, 230, $settings);

/* Overlay some gradient areas */
$settings = ["StartR" => 194, "StartG" => 231, "StartB" => 44, "EndR" => 43, "EndG" => 107, "EndB" => 58, "Alpha" => 50];
$image->drawGradientArea(0, 0, 700, 230, DIRECTION_VERTICAL, $settings);
$image->drawGradientArea(0, 0, 700, 20, DIRECTION_VERTICAL, [
    "StartR" => 0,
    "StartG" => 0,
    "StartB" => 0,
    "EndR" => 50,
    "EndG" => 50,
    "EndB" => 50,
    "Alpha" => 100
]);

/* Add a border to the picture */
$image->drawRectangle(0, 0, 699, 229, ["R" => 0, "G" => 0, "B" => 0]);

/* Write the picture title */
$image->setFontProperties(["FontName" => "Silkscreen.ttf", "FontSize" => 6]);
$image->drawText(10, 13, "pRadar - Draw polar charts", ["R" => 255, "G" => 255,
    "B" => 255]);

/* Set the default font properties */
$image->setFontProperties(["FontName" => "Forgotte.ttf", "FontSize" => 10,
    "R" => 80, "G" => 80, "B" => 80]);

/* Enable shadow computing */
$image->setShadow(true, ["X" => 2, "Y" => 2, "R" => 0, "G" => 0, "B" => 0,
    "Alpha" => 10]);

/* Create the pRadar object */
$radarChart = new Radar();

/* Draw a polar chart */
$image->setGraphArea(10, 25, 340, 225);
$options = ["BackgroundGradient" => [
    "StartR" => 255,
    "StartG" => 255,
    "StartB" => 255,
    "StartAlpha" => 100,
    "EndR" => 207,
    "EndG" => 227,
    "EndB" => 125,
    "EndAlpha" => 50
]];
$radarChart->drawPolar($image, $data, $options);

/* Draw a polar chart */
$image->setGraphArea(350, 25, 690, 225);
$options = [
    "LabelPos" => RADAR_LABELS_HORIZONTAL,
    "BackgroundGradient" => [
        "StartR" => 255, "StartG" => 255, "StartB" => 255, "StartAlpha" => 50, "EndR" => 32,
        "EndG" => 109, "EndB" => 174, "EndAlpha" => 30
    ],
    "AxisRotation" => 0,
    "DrawPoly" => true,
    "PolyAlpha" => 50
];
$radarChart->drawPolar($image, $data, $options);

/* Write the chart legend */
$image->setFontProperties(["FontName" => "pf_arma_five.ttf", "FontSize" => 6]);
$image->drawLegend(270, 205, ["Style" => LEGEND_BOX, "Mode" => LEGEND_HORIZONTAL]);

/* Render the picture (choose the best way) */
$image->autoOutput("example.polar.png");
```
