31      * @param int $value The length value string, e.g. '1cm'.
34     static public function stripDigits ($value) {  argument
35         return ltrim ($value, '-.0123456789');
41      * @param string|int $value The length value string, e.g. '1cm'.
44     static public function getDigits ($value) {  argument
46         $length = strlen ((string)$value);
48             if ( is_numeric ($value [$index]) === false &&
49                  $value [$index] != '.' && 
50                  $value [$index] != '-' ) {
53             $digits .= $value [$index];
71      * @param string|int $value The length value string, e.g. '1cm'.
74     static public function hasValidXSLUnit($value) {  argument
75         return in_array(self::stripDigits((string)$value), self::$xsl_units);
81      * @param int $value The value to be set.
83     public function setPixelPerEm ($value) {  argument
84         $this->px_per_em = $value;
99      * @param int $value The value to be set.
101     public function setTwipsPerPixelX ($value) {  argument
102         $this->twips_per_pixel_x = $value;
108      * @param int $value The value to be set.
110     public function setTwipsPerPixelY ($value) {  argument
111         $this->twips_per_pixel_y = $value;
140         $value = $pixel * $this->twips_per_pixel_x / self::$twips_per_point; 
141         return round ($value, 2).'pt';
152         $value = $pixel * $this->twips_per_pixel_y / self::$twips_per_point;
153         return round ($value, 2).'pt';
159      * @param string $value  String with length value, e.g. '20px', '20cm'...
164     public function toPoints ($value, $axis = 'y') {  argument
165         $unit = self::stripDigits ($value);
167             return $value;
172             return $value;
175         $value = self::getDigits ($value);
178                 $value = round (($value/self::$point_in_cm), 2).'pt';
181                 $value = round (($value/(10 * self::$point_in_cm)), 2).'pt';
184                 $value = round (($value * self::$inch_in_pt), 2).'pt';
187                 $value = round (($value * self::$pc_in_pt), 2).'pt';
191                     $value = $this->pixelToPointsX ($value);
193                     $value = $this->pixelToPointsY ($value);
197                 $value = $this->pixelToPointsY ($value * $this->getPixelPerEm());
200         return $value;
206      * @param string $value  String with length value, e.g. '20px', '20pt'...
211     public function toCentimeters ($value, $axis = 'y') {  argument
212         $unit = self::stripDigits ($value);
214             return $value;
219             return $value;
222         $value = self::toPoints ($value, $axis);
223         $value = substr($value, 0, -2);
224         $value = round (($value * self::$point_in_cm), 2).'cm';
225         return $value;
231      * @param string $value  String with length value, e.g. '20pt'...
236     public function toPixel ($value, $axis = 'y') {  argument
237         $unit = self::stripDigits ($value);
239             return $value;
244             return $value;
247         $value = self::toPoints ($value, $axis);
248         $value = substr($value, 0, -2);
250             $value = round ((($value*self::$twips_per_point)/$this->twips_per_pixel_x), 2).'px';
252             $value = round ((($value*self::$twips_per_point)/$this->twips_per_pixel_y), 2).'px';
254         return $value;
257     public function getAbsoluteValue ($value, $base) {  argument
258         $unit = self::stripDigits ($value);
260         $value = self::getDigits ($value);
263                 $value = ($value * $base)/100;
266                 $value = $value * $base;
272         return $value;