103 lines
2.9 KiB
PHP
103 lines
2.9 KiB
PHP
<?php
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// $Header: /cvsroot/html2ps/box.utils.text-align.inc.php,v 1.13 2007/01/09 20:13:48 Konstantin Exp $
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function ta_left(&$box, &$context, $lastline) {
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// Do nothing; text is left-aligned by default
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}
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function ta_center(&$box, &$context, $lastline) {
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$delta = $box->_line_length_delta($context) / 2;
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$size = count($box->_line);
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for ($i=0; $i< $size; $i++) {
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$box->_line[$i]->offset($delta, 0);
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};
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$first_box =& $box->_line[0];
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if (isset($first_box->wrapped) && !is_null($first_box->wrapped)) {
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$first_box->offset_wrapped(-$delta, 0);
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};
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}
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function ta_right(&$box, &$context, $lastline) {
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$delta = $box->_line_length_delta($context);
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$size = count($box->_line);
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for ($i=0; $i<$size; $i++) {
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$box->_line[$i]->offset($delta, 0);
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};
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$first_box =& $box->_line[0];
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if (isset($first_box->wrapped) && !is_null($first_box->wrapped)) {
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$first_box->offset_wrapped(-$delta, 0);
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};
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}
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function ta_justify(&$box, &$context, $lastline) {
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// last line is never justified
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if ($lastline) {
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return;
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}
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// If line box contains less that two items, no justification can be done, just return
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if (count($box->_line) < 2) {
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return;
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}
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// Calculate extra space to be filled by this line
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$delta = $box->_line_length_delta($context);
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// note that if it is the very first line inside the container, 'text-indent' value
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// should not be taken into account while calculating delta value
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if (count($box->content) > 0) {
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if ($box->content[0]->uid === $box->_line[0]->uid) {
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$delta -= $box->text_indent->calculate($box);
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};
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};
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// if line takes less that MAX_JUSTIFY_FRACTION of available space, no justtification should be done
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if ($delta > $box->_line_length() * MAX_JUSTIFY_FRACTION) {
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return;
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};
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// Calculate offset for each whitespace box
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$whitespace_count = 0;
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$size = count($box->_line);
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// Why $size-1? Ignore whitespace box, if it is located at the very end of
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// line box
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// Also, ignore whitespace box at the very beginning of the line
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for ($i=1; $i<$size-1; $i++) {
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if (is_a($box->_line[$i],"WhitespaceBox")) {
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$whitespace_count++;
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};
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};
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if ($whitespace_count > 0) {
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$offset = $delta / $whitespace_count;
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} else {
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$offset = 0;
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};
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// Offset all boxes in current line box
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$num_whitespaces = 0;
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$size = count($box->_line);
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for ($i=1; $i < $size; $i++) {
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/*
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* Note that order is important: additional horizontal space
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* is added after the whitespace box; it is important, as
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* whitespace box (if it is the last box in the line) should not
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* run off the right edge of the container box
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*/
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$box->_line[$i]->offset($offset * $num_whitespaces, 0);
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if (is_a($box->_line[$i],"WhitespaceBox")) {
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$num_whitespaces++;
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};
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};
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// The very first box is not offset in this case, so we don't need to
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// call offset_wrapped to compensate this.
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}
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?>
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