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    1: #!/usr/bin/perl
    2: # The LearningOnline Network with CAPA
    3: # randomlabel.png: composite together text and images into 1 image
    4: #
    5: # $Id: randomlylabel.pm,v 1.26 2005/04/07 06:56:22 albertel Exp $
    6: #
    7: # Copyright Michigan State University Board of Trustees
    8: #
    9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   10: #
   11: # LON-CAPA is free software; you can redistribute it and/or modify
   12: # it under the terms of the GNU General Public License as published by
   13: # the Free Software Foundation; either version 2 of the License, or
   14: # (at your option) any later version.
   15: #
   16: # LON-CAPA is distributed in the hope that it will be useful,
   17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   19: # GNU General Public License for more details.
   20: #
   21: # You should have received a copy of the GNU General Public License
   22: # along with LON-CAPA; if not, write to the Free Software
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: 
   30: =pod
   31: 
   32: =head1 Syntax of randomlylabel commands
   33: 
   34: Required items are: (one of BGIMG or SIZE) and OBJCOUNT
   35: 
   36: =over 4
   37: 
   38: =item BGIMG
   39: 
   40: /home/... file
   41: /res/ ... URL
   42: or href (href must contain http://...)
   43: Expected to be HTTP escaped
   44: 
   45: =item SIZE
   46: 
   47: width:height
   48: 
   49: Creates a blank canvas of size width,height.
   50: 
   51: =item BGCOLOR
   52: 
   53: either I<transparent> or a color hexstring
   54: 
   55: Sets the background color, if SIZE is used to create a new canvas,
   56: I<trasparent> makes the background transparent.
   57: 
   58: =item OBJCOUNT
   59: 
   60: a number
   61: 
   62: =item OBJTYPE
   63: 
   64: a colon seperated list of types, supported types are
   65: 
   66:          B<LINE> B<RECTANGLE> B<POLYGON> B<ARC> B<FILL> B<IMAGE> B<LABEL>
   67: 
   68: =item OBJI<num>
   69: 
   70: arguments for this OBJ
   71: 
   72: some common arguments are
   73: 
   74: =over 4
   75: 
   76: =item x y thickness
   77: 
   78: are pixel values
   79: 
   80: =item color
   81: 
   82: a hexstring, without with out a leading # or x)
   83: 
   84: =item filled
   85: 
   86: boolean, (1 or 0)
   87: 
   88: =back
   89: 
   90: The argumants for the possible object types are
   91: 
   92: =over 4
   93: 
   94: =item LINE
   95: 
   96: x1:y1:x2:y2:color:thickness
   97: 
   98: =item RECTANGLE 
   99: 
  100: x1:y1:x2:y2:color:thickness:filled
  101: 
  102: =item ARC
  103: 
  104: x:y:width:height:start:end:color:thickness:filled
  105: 
  106: =over 4
  107: 
  108: =item start, end
  109: 
  110: start and ends of the arc (in degrees)
  111: 
  112: =back
  113: 
  114: =item FILL
  115: 
  116: x:y:color
  117: 
  118: =item IMAGE
  119: 
  120: x:y:file:transparent:srcX:srcY:destW:destH:srcW:srcH
  121: 
  122: =over 4
  123: 
  124: =item srcX,srcY,srcW,srcH 
  125: 
  126: the start and extant of the region in file to copy to x,y with width/height
  127:            destW destH
  128: 
  129: =back
  130: 
  131: =item LABEL
  132: 
  133: x:y:text:font:color:direction
  134: 
  135: =over 4
  136: 
  137: =item text
  138: 
  139: HTTP escaped string of the text to place on the image
  140: 
  141: =item font
  142: 
  143: one of B<tiny>, B<small>, B<medium>, B<large>, B<giant>, or an
  144: installed TTF font and point size
  145: 
  146: =item direction
  147: 
  148: either B<horizontal> or B<vertical>
  149: 
  150: =back
  151: 
  152: =item  POLYGON
  153: 
  154: color:width:open:filled
  155: 
  156: =over 4 
  157: 
  158: =item open
  159: 
  160: boolean, (1 or 0)
  161: 
  162: =back
  163: 
  164: =back
  165: 
  166: 
  167: =item OBJEXTRAI<num>
  168: 
  169: extra arguments for object I<num>
  170: 
  171: The possible values for this for the different object types are
  172: 
  173: =over 4
  174: 
  175: =item POLYGON 
  176: 
  177: a list of coords in the form
  178: 
  179:      (x,y)-(x,y)-(x,y)
  180: 
  181: (there can be arbitrarily many of these)
  182: 
  183: =back
  184: 
  185: =back
  186: 
  187: =head1 Example
  188: 
  189:  BGIMG=file
  190:  OBJTYPE=LINE:LINE:LINE:LINE
  191:  OBJCOUNT=4
  192:  OBJ0=xmin:ymin:xmax:ymax:FFFFFF:3
  193:  OBJ1=xmin:ymax:xmax:ymin:FFFFFF:3
  194:  OBJ2=xmin:ymin:xmax:ymax:FF0000:1
  195:  OBJ3=xmin:ymax:xmax:ymin:FF0000:1
  196: 
  197: =cut
  198: 
  199: package Apache::randomlylabel;
  200: 
  201: use strict;
  202: use Image::Magick;
  203: use Apache::Constants qw(:common);
  204: use Apache::loncommon();
  205: use GD;
  206: use GD::Polyline();
  207: use LWP::UserAgent();
  208: use Apache::lonnet;
  209: 
  210: sub get_image {
  211:     my ($imgsrc,$set_trans)=@_;
  212:     my $image;
  213:     if ($imgsrc !~ m|^(/home/)|) {
  214: 	if ($imgsrc !~ /^http:/) {
  215: 	    $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
  216: 	}
  217: 	my $ua=new LWP::UserAgent;
  218: 	my $request=new HTTP::Request('GET',"$imgsrc");
  219: 	$request->header(Cookie => $ENV{'HTTP_COOKIE'});
  220: 	my $file="/tmp/imagetmp".$$;
  221: 	my $response=$ua->request($request,$file);
  222: 	if ($response->is_success) {
  223: 	    if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
  224: 		my $conv_image = Image::Magick->new;
  225: 		my $current_figure = $conv_image->Read('filename'=>$file);
  226: 		$conv_image->Set('type'=>'TrueColor');
  227: 		$conv_image->Set('magick'=>'png');
  228: 		my @blobs=$conv_image->ImageToBlob();
  229: 		undef $conv_image;
  230: 		$image = GD::Image->new($blobs[0]);
  231: 	    } else {
  232: 		GD::Image->trueColor(1);
  233: 		$image = GD::Image->new($file);
  234: 	    }
  235: 	}
  236:     } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
  237: 	my $conv_image = Image::Magick->new;
  238: 	my $current_figure = $conv_image->Read('filename'=>$imgsrc);
  239: 	$conv_image->Set('type'=>'TrueColor');
  240: 	$conv_image->Set('magick'=>'png');
  241: 	my @blobs=$conv_image->ImageToBlob();
  242: 	undef $conv_image;
  243: 	$image = GD::Image->new($blobs[0]);
  244:     } else {
  245: 	$image = GD::Image->trueColor(1);
  246: 	$image = GD::Image->new($imgsrc);
  247:     }
  248:     if ($set_trans && defined($image)) {
  249: 	my $white=$image->colorExact(255,255,255);
  250: 	if ($white != -1) { $image->transparent($white); }
  251:     }
  252:     return $image;
  253: }
  254: 
  255: sub get_color_from_hexstring {
  256:     my ($image,$color)=@_;
  257:     if (!$color) { $color='000000'; }
  258:     $color=~s/^[x\#]//;
  259:     my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
  260:     $red=hex($red);$green=hex($green);$blue=hex($blue);
  261:     my $imcolor;
  262:     if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
  263: 	$imcolor = $image->colorClosestHWB($red,$green,$blue);
  264:     }
  265:     return $imcolor;
  266: }
  267: 
  268: sub handler {
  269:     my $r = shift;
  270:     $r->content_type('image/png');
  271:     $r->send_http_header;
  272:     my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
  273:     my $image;
  274:     my $prefix="cgi.$id.";
  275:     if ($ENV{'QUERY_STRING'}=~/OBJCOUNT\=/) {
  276: 	&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
  277: 	$prefix='form.';
  278:     }
  279:     if (defined($env{$prefix."BGIMG"})) {
  280: 	my $bgimg=&Apache::lonnet::unescape($env{$prefix."BGIMG"});
  281: 	#&Apache::lonnet::logthis("BGIMG is ".$bgimg);
  282: 	$image=&get_image($bgimg,0);
  283: 	if (! defined($image)) {
  284: 	    &Apache::lonnet::logthis('Unable to create image object for -'.
  285: 				     $id.'-'.$bgimg);
  286: 	    return OK;
  287: 	}
  288:     } elsif (defined($env{$prefix."SIZE"})) {
  289: 	my ($width,$height)=split(':',$env{$prefix."SIZE"});
  290: 	$image = new GD::Image($width,$height,1);
  291: 	my ($bgcolor)=split(':',$env{$prefix."BGCOLOR"});
  292: 	if ($bgcolor ne 'transparent') {
  293: 	    $bgcolor=&get_color_from_hexstring($image,$bgcolor);
  294: #	$image->rectangle(0,0,$width,$height,$bgcolor);
  295: 	    $image->fill(0,0,$bgcolor);
  296: 	} else {
  297: 	    $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
  298: 	    $image->fill(0,0,$bgcolor);
  299: 	    $image->transparent($bgcolor);
  300: 	}
  301:     } else {
  302: 	&Apache::lonnet::logthis('Unable to create image object, no info');
  303: 	return OK;
  304:     }
  305:     #binmode(STDOUT);
  306:     my @objtypes=split(':',$env{$prefix."OBJTYPE"});
  307:     foreach(my $i=0;$i<$env{$prefix."OBJCOUNT"};$i++) {
  308: 	my $type=shift(@objtypes);
  309: 	if ($type eq 'LINE') {
  310: 	    my ($x1,$y1,$x2,$y2,$color,$thickness)=
  311: 		split(':',$env{$prefix."OBJ$i"});
  312: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  313: 	    if (!defined($thickness)) { $thickness=1; }
  314: 	    $image->setThickness($thickness);
  315: #	    $image->setAntiAliased($imcolor);
  316: 	    $image->line($x1,$y1,$x2,$y2,$imcolor);
  317: 	} elsif ($type eq 'RECTANGLE') {
  318: 	    my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
  319: 		split(':',$env{$prefix."OBJ$i"});
  320: 	    if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
  321: 	    if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
  322: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  323: 	    if (!defined($thickness)) { $thickness=1; }
  324: 	    $image->setThickness($thickness);
  325: #	    $image->setAntiAliased($imcolor);
  326: 	    if ($filled) {
  327: 		$image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
  328: 	    } else {
  329: 		$image->rectangle($x1,$y1,$x2,$y2,$imcolor);
  330: 	    }
  331: 	} elsif ($type eq 'POLYGON') {
  332: 	    my ($color,$width,$open,$filled)=split(':',$env{$prefix."OBJ$i"});
  333: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  334: 	    my $polygon = (($open && lc ($open ne 'no')) ?
  335: 			   (new GD::Polyline) : (new GD::Polygon));
  336: 	    my $added=0;
  337: 	    foreach my $coord (split('-',$env{$prefix."OBJEXTRA$i"})) {
  338: 		my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
  339: 		$polygon->addPt($x,$y);
  340: 		$added++;
  341: 	    }
  342: 	    
  343: 	    $image->setThickness($width);
  344: 	    if ($added) {
  345: 		if ($open && lc($open) ne 'no') {
  346: 		    $image->polydraw($polygon,$imcolor);
  347: 		} elsif ($filled && lc($filled) ne 'no') {
  348: 		    $image->filledPolygon($polygon,$imcolor);
  349: 		} else {
  350: 		    $image->polygon($polygon,$imcolor);
  351: 		}
  352: 	    }
  353: 	} elsif ($type eq 'ARC') {
  354: 	    my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
  355: 		split(':',$env{$prefix."OBJ$i"});
  356: 	    if (!$color) { $color='000000'; }
  357: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  358: 	    if (!defined($thickness)) { $thickness=1; }
  359: 	    $image->setThickness($thickness);
  360: #	    $image->setAntiAliased($imcolor);
  361: 	    if ($filled) {
  362: 		$image->filledArc($x,$y,$width,$height,$start,$end,
  363: 				  $imcolor);
  364: 	    } else {
  365: 		$image->arc($x,$y,$width,$height,$start,$end,$imcolor);
  366: 	    }
  367: 	} elsif ($type eq 'FILL') {
  368: 	    my ($x,$y,$color)=split(':',$env{$prefix."OBJ$i"});
  369: 	    if (!$color) { $color='000000'; }
  370: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  371: 	    $image->fill($x,$y,$imcolor);
  372: 	} elsif ($type eq 'IMAGE') {
  373: 	    my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
  374: 		$srcH)=split(':',$env{$prefix."OBJ$i"});
  375: 	    $file=&Apache::lonnet::unescape($file);
  376: 	    if (!defined($transparent)) { $transparent=1; }
  377: 	    my $subimage=&get_image($file,$transparent);
  378: 	    if (!defined($subimage)) {
  379: 		&Apache::lonnet::logthis('Unable to create image object for '.
  380: 					 $file);
  381: 		next;
  382: 	    }
  383: 	    if (!defined($srcW) or !$srcW) {$srcW=($subimage->getBounds())[0];}
  384: 	    if (!defined($srcH) or !$srcH) {$srcH=($subimage->getBounds())[1];}
  385: 	    if (!defined($destW) or !$destW) { $destW=$srcW; }
  386: 	    if (!defined($destH) or !$destH) { $destH=$srcH; }
  387: 	    $image->copyResized($subimage,$x,$y,$srcX,$srcY,$destW,$destH,
  388: 				$srcW,$srcH);
  389: 	} elsif ($type eq 'LABEL') {
  390: 	    my ($x,$y,$text,$font,$color,$direction)=
  391: 		split(':',$env{$prefix."OBJ$i"});
  392: 	    $text=&Apache::lonnet::unescape($text);
  393: 	    my $imcolor=&get_color_from_hexstring($image,$color);
  394: 	    my $type='normal';
  395: 	    my ($height,$fontref);
  396: 	    if ($font eq 'tiny') {
  397: 		$height=GD::Font->Tiny->height;
  398: 		$fontref=GD::gdTinyFont;
  399: 	    } elsif ($font eq 'small') {
  400: 		$height=GD::Font->Small->height;
  401: 		$fontref=GD::gdSmallFont;
  402: 	    } elsif ($font eq 'medium') {
  403: 		$height=GD::Font->MediumBold->height;
  404: 		$fontref=GD::gdMediumBoldFont;
  405: 	    } elsif ($font eq 'large') {
  406: 		$height=GD::Font->Large->height;
  407: 		$fontref=GD::gdLargeFont;
  408: 	    } elsif ($font eq 'giant' || !$font) {
  409: 		$height=GD::Font->Giant->height;
  410: 		$fontref=GD::gdGiantFont;
  411: 	    } else {
  412: 		$type='ttf';
  413: 	    }
  414: 	    if ($type eq 'normal' && $direction eq 'vertical') {
  415: 		$image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
  416: 	    } elsif ($type eq 'normal') {
  417: 		$image->string($fontref,$x,$y-$height,$text,$imcolor);
  418: 	    } elsif ($type eq 'ttf') {
  419: 		my ($fontname,$ptsize)=split(/\s+/,$font);
  420: 		$image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
  421: 	    }
  422: 	} else {
  423: 	    &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
  424: 	}
  425:     }
  426:     $image->setThickness(1);
  427:     $r->print($image->png);
  428:     return OK;
  429: }
  430: 
  431: 1;