(PECL imagick 2.0.0)
ImagickDraw::setTextAlignment — Specifies a text alignment
$alignment
   )This function is currently not documented; only its argument list is available.
Specifies a text alignment to be applied when annotating with text.
alignmentALIGN_ constant
No value is returned.
Example #1 ImagickDraw::setTextAlignment()
<?php
function setTextAlignment($strokeColor, $fillColor, $backgroundColor) {
    $draw = new \ImagickDraw();
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(1);
    $draw->setFontSize(36);
    $draw->setTextAlignment(\Imagick::ALIGN_LEFT);
    $draw->annotation(250, 75, "Lorem Ipsum!");
    $draw->setTextAlignment(\Imagick::ALIGN_CENTER);
    $draw->annotation(250, 150, "Lorem Ipsum!");
    $draw->setTextAlignment(\Imagick::ALIGN_RIGHT);
    $draw->annotation(250, 225, "Lorem Ipsum!");
    $draw->line(250, 0, 250, 500);
    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}
?>