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<?php
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// $Header: /cvsroot/html2ps/utils_units.php,v 1.22 2007/01/24 18:56:10 Konstantin Exp $
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function round_units($value) {
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  return round($value,2);
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}
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function pt2pt($pt) {
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  return $pt * $GLOBALS['g_pt_scale'];
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}
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function px2pt($px) {
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  global $g_px_scale;
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  return $px * $g_px_scale;
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}
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function mm2pt($mm) {
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  return $mm * 2.834645669;
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}
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function units_mul($value, $koeff) {
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  if (preg_match("/(pt|pc|px|mm|cm|em|ex)$/",$value)) {
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    $units = substr($value, strlen($value)-2,2);
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  } else {
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    $units = "";
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  };
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  return sprintf("%.2f%s",
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                 round((double)$value * $koeff,2),
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                 $units);
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}
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function punits2pt($value, $font_size) {
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  $value = trim($value);
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  // Check if current value is percentage
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  if (substr($value, strlen($value)-1, 1) === "%") {
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    return array((float)$value, true);
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  } else {
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    return array(units2pt($value, $font_size), false);
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  }
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}
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function em2pt($value, $font_size) {
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  return $font_size * (double)$value * EM_KOEFF;
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}
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function ex2pt($value, $font_size) {
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  return $font_size * (double)$value * EX_KOEFF;
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}
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function units2pt($value, $font_size = null) {
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  $unit = Value::unit_from_string($value);
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  switch ($unit) {
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  case UNIT_PT:
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    return pt2pt((double)$value);
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  case UNIT_PX:
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    return px2pt((double)$value);
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  case UNIT_MM:
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    return pt2pt(mm2pt((double)$value));
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  case UNIT_CM:
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    return pt2pt(mm2pt((double)$value*10));
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  case UNIT_EM:
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    return em2pt((double)$value, $font_size);
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  case UNIT_EX:
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    return ex2pt((double)$value, $font_size);
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  case UNIT_IN:
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    return pt2pt((double)$value*72); // points used by CSS 2.1 are equal to 1/72nd of an inch.
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  case UNIT_PC:
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    return pt2pt((double)$value*12); // 1 pica equals to 12 points.
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  default:
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    global $g_config;
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    if ($g_config['mode'] === 'quirks') {
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      return px2pt((double)$value);
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    } else {
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      return 0;
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    };
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  };
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}
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?>