/**
* Calculate text width
*
* @param string $text
* @param Zend_Pdf_Page|Zend_Pdf_Resource_Font $resource
* @param int $fontSize
* @param string $encoding
* @return double
*/
public function getTextWidth($text, $resource, $fontSize = null, $encoding = 'UTF-8')
{
if ($resource instanceof Zend_Pdf_Page) {
$font = $resource->getFont();
$fontSize = $resource->getFontSize();
} elseif ($resource instanceof Zend_Pdf_Resource_Font) {
$font = $resource;
if ($fontSize === null) {
throw new Exception('The fontsize is unknown');
}
}
if (!$font instanceof Zend_Pdf_Resource_Font) {
throw new Exception('Invalid resource passed');
}
//$drawingText = iconv ( '', $encoding, $text );
$drawingText = $text;
$characters = array();
for ($i = 0; $i < strlen($drawingText); $i++) {
$characters[] = ord($drawingText[$i]);
}
$glyphs = $font->glyphNumbersForCharacters($characters);
$widths = $font->widthsForGlyphs($glyphs);
$textWidth = array_sum($widths) / $font->getUnitsPerEm() * $fontSize;
return $textWidth;
}
