/**
* Composites a watermark (the date strings of the image) onto the lower
* left corner and the HV logo in the lower right corner.
*
* Layer names are added together as one string, and date strings are
* added as a separate string, to line them up nicely. An example string
* would be:
*
* -annotate +20+0 'EIT 304\nLASCO C2\n'
* and:
* -annotate +100+0 '2003-01-01 12:00\n2003-01-01 11:30\n'
*
* These two strings are then layered on top of each other and put in the
* southwest corner of the image.
*
* @param object $imagickImage An Imagick object
*
* @return void
*/
private function _addWatermark($imagickImage)
{
if ($this->width < 200 || $this->height < 200) {
return;
}
$watermark = new IMagick(HV_ROOT_DIR . '/resources/images/' . 'watermark_small_black_border.png');
// If the image is too small, use only the circle, not the url, and
// scale it so it fits the image.
if ($this->width / 300 < 2) {
$watermark->readImage(HV_ROOT_DIR . '/resources/images/' . 'watermark_circle_small_black_border.png');
$scale = $this->width / 2 / 300;
$width = $watermark->getImageWidth();
$watermark->scaleImage($width * $scale, $width * $scale);
}
// For whatever reason, compositeImage() doesn't carry over gravity
// settings so the offsets must be relative to the top left corner of
// the image rather than the desired gravity.
$x = $this->width - $watermark->getImageWidth() - 10;
$y = $this->height - $watermark->getImageHeight() - 10;
$imagickImage->compositeImage($watermark, IMagick::COMPOSITE_DISSOLVE, $x, $y);
// If the image is too small, text won't fit. Don't put a date string
// on it.
if ($this->width > 285) {
$this->_addTimestampWatermark($imagickImage);
}
// Cleanup
$watermark->destroy();
}
