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<?php
/*!*******************************************************************************
*! FILE NAME : escher_pattern.php
*! DESCRIPTION: slanted curved checker board generator
*! requires php5-ps, ps2pdf
*! Copyright (C) 2010 Elphel, Inc
*! -----------------------------------------------------------------------------**
*!
*! This program is free software: you can redistribute it and/or modify
*! it under the terms of the GNU General Public License as published by
*! the Free Software Foundation, either version 3 of the License, or
*! (at your option) any later version.
*!
*! This program is distributed in the hope that it will be useful,
*! but WITHOUT ANY WARRANTY; without even the implied warranty of
*! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*! GNU General Public License for more details.
*!
*! You should have received a copy of the GNU General Public License
*! along with this program. If not, see <http://www.gnu.org/licenses/>.
*! -----------------------------------------------------------------------------**
*/
$orientation= 'P'; // P/L
$unit= 'mm' ; /// pt,mm,cm,in
//$format= array(40,20); /// width and height of current units
$unicode= true;
$encoding= "UTF-8";
$diskcache= false; /// use temporary files
$margin_top= 2;
$margin_bottom= 1;
$margin_left= 1;
$margin_right= 1;
$LPM=50;
$PAGE_WIDTH=270;
$PAGE_HEIGHT=210;
$ROTATE=5;
$ESCHER=2.0;
$tmpdir ='/tmp';
$filetype='PDF';
foreach ($_GET as $key=>$value) {
switch (strtoupper($key)) {
case 'PAGE_WIDTH': $PAGE_WIDTH=$value+0;break;
case 'PAGE_HEIGHT':$PAGE_HEIGHT=$value+0;break;
case 'LPM': $LPM=$value+0;break;
case 'ESCHER': $ESCHER=$value+0;break;
case 'ROTATE': $ROTATE=$value+0;break;
case 'MODE':
case 'TYPE': $filetype=$value;break;
}
}
$basename='escher-pattern-ESCHER'.$ESCHER.'-LPM'.$LPM.'-ROT'.$ROTATE.'-PAGE_WIDTH'.$PAGE_WIDTH.'-PAGE_HEIGHT'.$PAGE_HEIGHT;
$ps_name=$tmpdir.'/'.$basename.'.ps';
$pdf_name=$tmpdir.'/'.$basename.'.pdf';
$mm2points=72/25.4;
$PW_POINTS=$PAGE_WIDTH*$mm2points;
$PH_POINTS=$PAGE_HEIGHT*$mm2points;
$ps = ps_new();
if (!ps_open_file($ps, $ps_name)) {
print 'Cannot open PostScript file '.$ps_name."\n";
exit(1);
}
ps_set_parameter($ps, "warning", "true");
ps_set_info($ps, "Creator", " escher_pattern.php");
ps_set_info($ps, "Author", "Elphel");
ps_set_info($ps, "Title", "PSF measurement pattern");
$Size=1.0;
$qSize=$Size/4;
$hSize=$Size/2;
$a=$ESCHER*(sqrt(2)-1.0);
$angle=-$ROTATE; // PS starts from tyhe bottom left
if ($ESCHER>0) {
$r=($a*$a+1)/(2*$a)*$qSize;
$r2=$r*$r;
$h=sqrt($r2-$qSize*$qSize);
$dc=2*$qSize-$h;
$halfAangle=rad2deg(atan($qSize/$h));
//$center=1.5*$sideOfSquare;
$center=$dc+$r;
$pstemplate = ps_begin_template($ps, 2*$center, 2*$center);
ps_moveto($ps, $center-$hSize, $center-$hSize);
ps_arc ($ps , $center-$Size+$dc, $center-$qSize, $r, 0-$halfAangle , 0+$halfAangle );
ps_arcn ($ps , $center-$dc , $center+$qSize, $r, 180+$halfAangle , 180-$halfAangle );
ps_arc ($ps , $center-$qSize, $center+$Size-$dc, $r, 270-$halfAangle , 270+$halfAangle );
ps_arcn ($ps , $center+$qSize, $center+$dc, $r, 90+$halfAangle , 90-$halfAangle );
ps_arc ($ps , $center+$Size-$dc,$center+$qSize, $r, 180-$halfAangle , 180+$halfAangle );
ps_arcn ($ps , $center+$dc, $center-$qSize, $r, 0+$halfAangle , 0-$halfAangle );
ps_arc ($ps , $center+$qSize, $center-$Size+$dc, $r, 90-$halfAangle , 90+$halfAangle );
ps_arcn ($ps , $center-$qSize, $center-$dc, $r, 270+$halfAangle , 270-$halfAangle );
ps_fill($ps);
ps_end_template($ps);
} else {
$pstemplate = ps_begin_template($ps, $Size, $Size);
ps_moveto($ps, 0, 0);
ps_lineto($ps, 0, $Size);
ps_lineto($ps, $Size,$Size);
ps_lineto($ps, $Size,0);
ps_lineto($ps, 0,0);
ps_fill($ps);
ps_end_template($ps);
}
$s=$PW_POINTS+$PH_POINTS;
$sideOfSquare=500/$LPM*$mm2points;
$numberOfSquares=floor((4*$s-$sideOfSquare)/(2*$sideOfSquare));
$s=(2*$numberOfSquares+1)*$sideOfSquare;
ps_begin_page($ps, $PW_POINTS, $PH_POINTS);
ps_setcolor($ps, "fill", "cmyk", 0, 0, 0, 1);
ps_rotate($ps,$angle);
for ($y=-$s;$y<$s;$y+=2*$sideOfSquare) for ($x=-$s;$x<$s;$x+=2*$sideOfSquare) {
ps_place_image($ps, $pstemplate, $x, $y,$sideOfSquare);
ps_place_image($ps, $pstemplate, $x+$sideOfSquare, $y+$sideOfSquare,$sideOfSquare);
}
ps_end_page($ps);
ps_close($ps);
ps_delete($ps);
if ($filetype=='PDF') {
// echo 'ps2pdf -dDEVICEWIDTHPOINTS='.$PW_POINTS.' -dDEVICEHEIGHTPOINTS='.$PH_POINTS.' '.$ps_name.' '.$pdf_name;
exec('ps2pdf -dDEVICEWIDTHPOINTS='.$PW_POINTS.' -dDEVICEHEIGHTPOINTS='.$PH_POINTS.' '.$ps_name.' '.$pdf_name);
$outfile=$pdf_name;
header('Content-Type: application/pdf');
} else {
$outfile=$ps_name;
header('Content-Type: application/postscript');
}
if (headers_sent()) {
echo 'Some data has already been output to browser, can\'t send PDF file';
exit (1);
}
header('Cache-Control: public, must-revalidate, max-age=0'); // HTTP/1.1
header('Pragma: public');
header('Expires: Sat, 26 Jul 1997 05:00:00 GMT'); // Date in the past
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
$fp = fopen($outfile, 'rb');
fseek($fp, 0, SEEK_END); /// file pointer at the end of the file (to find the file size)
$fsize = ftell($fp); /// get file size
fseek($fp, 0, SEEK_SET); /// rewind to the start of the file
header('Content-Length: '.$fsize);
header('Content-Disposition: inline; filename="'.basename($outfile).'";');
fpassthru($fp); /// send the raw data itself
fclose($fp);
//echo 'Done - see '.$pdf_name;
?>