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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * @package phpMyAdmin
 */

/**
 * 
 */
require_once 'pma_pchart_single.php';

/**
 * implements single radar chart
 * @package phpMyAdmin
 */
class PMA_pChart_single_radar extends PMA_pChart_single
{
    public function __construct($data, $options = null)
    {
        parent::__construct($data, $options);

        $this->normalizeValues();
    }

    /**
     * Get the largest value from the data and normalize all the other values.
     */
    private function normalizeValues()
    {
        $maxValue = 0;
        $keys = array_keys($this->data);
        $valueKey = $keys[0];
        $maxValue = max($this->data[$valueKey]);

        foreach ($this->data[$valueKey] as &$value) {
            $value = $value / $maxValue * 10;
        }
    }

    /**
     * graph area for the radar chart does not include grid lines
     */
    protected function drawGraphArea()
    {
        $this->chart->drawGraphArea(
                $this->getGraphAreaColor(RED),
                $this->getGraphAreaColor(GREEN),
                $this->getGraphAreaColor(BLUE),
                FALSE
        );
        
        if($this->settings['gradientIntensity']>0)
            $this->chart->drawGraphAreaGradient(
                    $this->getGraphAreaGradientColor(RED),
                    $this->getGraphAreaGradientColor(GREEN),
                    $this->getGraphAreaGradientColor(BLUE),
                    $this->settings['gradientIntensity']
            );
        else
            $this->chart->drawGraphArea(
                    $this->getGraphAreaGradientColor(RED),
                    $this->getGraphAreaGradientColor(GREEN),
                    $this->getGraphAreaGradientColor(BLUE)
            );
        
    }

    /**
     * draws the radar chart
     */
    protected function drawChart()
    {
        // when drawing radar graph we can specify the border from the top of
        // graph area. We want border to be dynamic, so that either the top
        // or the side of the radar is some distance away from the top or the
        // side of the graph area.
        $areaWidth = $this->chart->GArea_X2 - $this->chart->GArea_X1;
        $areaHeight = $this->chart->GArea_Y2 - $this->chart->GArea_Y1;

        if ($areaHeight > $areaWidth) {
            $borderOffset = ($areaHeight - $areaWidth) / 2;
        }
        else {
            $borderOffset = 0;
        }

        // the least ammount that radar is away from the graph area side.
        $borderOffset += 40;

        $this->chart->drawRadarAxis($this->dataSet->GetData(), $this->dataSet->GetDataDescription(), 
            TRUE, $borderOffset, 120, 120, 120, 230, 230, 230, -1, 2);
        $this->chart->drawFilledRadar($this->dataSet->GetData(), $this->dataSet->GetDataDescription(), 50, $borderOffset);
    }
}

?>
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