private function drawPoiCircle($poi, $color, $borderSize, $pointSize)
{
$dot = new ImagickDraw();
$dot->setStrokeColor($color);
$dot->setFillColor('transparent');
$dot->setStrokeAntialias(true);
$dot->setStrokeWidth($borderSize);
$dot->circle($poi['cx'], $poi['cy'], $poi['cx'] + $pointSize, $poi['cy'] + $pointSize);
// Draw the border
$this->imagick->drawImage($dot);
}