Annotation of loncom/homework/randomlylabel.pm, revision 1.25

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network with CAPA
                      3: # randomlabel.png: composite together text and images into 1 image
                      4: #
1.25    ! www         5: # $Id: randomlylabel.pm,v 1.24 2005/02/23 16:11:42 albertel Exp $
1.1       albertel    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: #
1.22      albertel   29: 
                     30: =pod
                     31: 
                     32: =head1 Syntax of randomlylabel commands
                     33: 
1.25    ! www        34: Required items are: (one of BGIMG or SIZE) and OBJCOUNT
1.24      albertel   35: 
1.22      albertel   36: =over 4
                     37: 
                     38: =item BGIMG
                     39: 
1.25    ! www        40: /home/... file
        !            41: /res/ ... URL
        !            42: or href (href must contain http://...)
1.22      albertel   43: Expected to be HTTP escaped
                     44: 
1.24      albertel   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: 
1.22      albertel   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
1.1       albertel  198: 
                    199: package Apache::randomlylabel;
                    200: 
                    201: use strict;
                    202: use Image::Magick;
                    203: use Apache::Constants qw(:common);
                    204: use Apache::loncommon();
1.17      albertel  205: use GD;
1.13      albertel  206: use GD::Polyline();
1.15      albertel  207: use LWP::UserAgent();
1.3       albertel  208: 
                    209: sub get_image {
                    210:     my ($imgsrc,$set_trans)=@_;
                    211:     my $image;
1.15      albertel  212:     if ($imgsrc !~ m|^(/home/)|) {
                    213: 	if ($imgsrc !~ /^http:/) {
                    214: 	    $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
                    215: 	}
                    216: 	my $ua=new LWP::UserAgent;
                    217: 	my $request=new HTTP::Request('GET',"$imgsrc");
                    218: 	$request->header(Cookie => $ENV{'HTTP_COOKIE'});
                    219: 	my $file="/tmp/imagetmp".$$;
                    220: 	my $response=$ua->request($request,$file);
                    221: 	if ($response->is_success) {
                    222: 	    if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
                    223: 		my $conv_image = Image::Magick->new;
                    224: 		my $current_figure = $conv_image->Read('filename'=>$file);
1.20      albertel  225: 		$conv_image->Set('type'=>'TrueColor');
1.15      albertel  226: 		$conv_image->Set('magick'=>'png');
                    227: 		my @blobs=$conv_image->ImageToBlob();
                    228: 		undef $conv_image;
                    229: 		$image = GD::Image->new($blobs[0]);
                    230: 	    } else {
                    231: 		GD::Image->trueColor(1);
                    232: 		$image = GD::Image->new($file);
                    233: 	    }
                    234: 	}
                    235:     } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
1.3       albertel  236: 	my $conv_image = Image::Magick->new;
                    237: 	my $current_figure = $conv_image->Read('filename'=>$imgsrc);
1.20      albertel  238: 	$conv_image->Set('type'=>'TrueColor');
1.3       albertel  239: 	$conv_image->Set('magick'=>'png');
                    240: 	my @blobs=$conv_image->ImageToBlob();
                    241: 	undef $conv_image;
                    242: 	$image = GD::Image->new($blobs[0]);
                    243:     } else {
1.17      albertel  244: 	$image = GD::Image->trueColor(1);
1.3       albertel  245: 	$image = GD::Image->new($imgsrc);
                    246:     }
1.9       albertel  247:     if ($set_trans && defined($image)) {
1.3       albertel  248: 	my $white=$image->colorExact(255,255,255);
                    249: 	if ($white != -1) { $image->transparent($white); }
                    250:     }
                    251:     return $image;
                    252: }
1.1       albertel  253: 
1.16      albertel  254: sub get_color_from_hexstring {
                    255:     my ($image,$color)=@_;
                    256:     if (!$color) { $color='000000'; }
1.23      albertel  257:     $color=~s/^[x\#]//;
1.16      albertel  258:     my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
                    259:     $red=hex($red);$green=hex($green);$blue=hex($blue);
                    260:     my $imcolor;
                    261:     if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
                    262: 	$imcolor = $image->colorClosestHWB($red,$green,$blue);
                    263:     }
                    264:     return $imcolor;
                    265: }
                    266: 
1.1       albertel  267: sub handler {
                    268:     my $r = shift;
                    269:     $r->content_type('image/png');
1.15      albertel  270:     $r->send_http_header;
1.11      albertel  271:     my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.17      albertel  272:     my $image;
1.24      albertel  273:     my $prefix="cgi.$id.";
                    274:     if ($ENV{'QUERY_STRING'}=~/OBJCOUNT\=/) {
                    275: 	&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
                    276: 	$prefix='form.';
                    277:     }
                    278:     if (defined($ENV{$prefix."BGIMG"})) {
                    279: 	my $bgimg=&Apache::lonnet::unescape($ENV{$prefix."BGIMG"});
1.18      albertel  280: 	#&Apache::lonnet::logthis("BGIMG is ".$bgimg);
1.17      albertel  281: 	$image=&get_image($bgimg,0);
                    282: 	if (! defined($image)) {
                    283: 	    &Apache::lonnet::logthis('Unable to create image object for -'.
                    284: 				     $id.'-'.$bgimg);
                    285: 	    return OK;
                    286: 	}
1.24      albertel  287:     } elsif (defined($ENV{$prefix."SIZE"})) {
                    288: 	my ($width,$height)=split(':',$ENV{$prefix."SIZE"});
1.16      albertel  289: 	$image = new GD::Image($width,$height,1);
1.24      albertel  290: 	my ($bgcolor)=split(':',$ENV{$prefix."BGCOLOR"});
1.16      albertel  291: 	if ($bgcolor ne 'transparent') {
                    292: 	    $bgcolor=&get_color_from_hexstring($image,$bgcolor);
                    293: #	$image->rectangle(0,0,$width,$height,$bgcolor);
                    294: 	    $image->fill(0,0,$bgcolor);
                    295: 	} else {
                    296: 	    $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
                    297: 	    $image->fill(0,0,$bgcolor);
                    298: 	    $image->transparent($bgcolor);
                    299: 	}
                    300:     } else {
                    301: 	&Apache::lonnet::logthis('Unable to create image object, no info');
                    302: 	return OK;
1.4       matthew   303:     }
1.1       albertel  304:     #binmode(STDOUT);
1.24      albertel  305:     my @objtypes=split(':',$ENV{$prefix."OBJTYPE"});
                    306:     foreach(my $i=0;$i<$ENV{$prefix."OBJCOUNT"};$i++) {
1.16      albertel  307: 	my $type=shift(@objtypes);
                    308: 	if ($type eq 'LINE') {
                    309: 	    my ($x1,$y1,$x2,$y2,$color,$thickness)=
1.24      albertel  310: 		split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  311: 	    my $imcolor=&get_color_from_hexstring($image,$color);
                    312: 	    if (!defined($thickness)) { $thickness=1; }
                    313: 	    $image->setThickness($thickness);
1.21      albertel  314: #	    $image->setAntiAliased($imcolor);
                    315: 	    $image->line($x1,$y1,$x2,$y2,$imcolor);
1.16      albertel  316: 	} elsif ($type eq 'RECTANGLE') {
                    317: 	    my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
1.24      albertel  318: 		split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  319: 	    if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
                    320: 	    if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
                    321: 	    my $imcolor=&get_color_from_hexstring($image,$color);
                    322: 	    if (!defined($thickness)) { $thickness=1; }
                    323: 	    $image->setThickness($thickness);
                    324: #	    $image->setAntiAliased($imcolor);
                    325: 	    if ($filled) {
                    326: 		$image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
                    327: 	    } else {
                    328: 		$image->rectangle($x1,$y1,$x2,$y2,$imcolor);
                    329: 	    }
                    330: 	} elsif ($type eq 'POLYGON') {
1.24      albertel  331: 	    my ($color,$width,$open,$filled)=split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  332: 	    my $imcolor=&get_color_from_hexstring($image,$color);
1.21      albertel  333: 	    my $polygon = (($open && lc ($open ne 'no')) ?
                    334: 			   (new GD::Polyline) : (new GD::Polygon));
1.18      albertel  335: 	    my $added=0;
1.24      albertel  336: 	    foreach my $coord (split('-',$ENV{$prefix."OBJEXTRA$i"})) {
1.16      albertel  337: 		my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
                    338: 		$polygon->addPt($x,$y);
1.18      albertel  339: 		$added++;
1.16      albertel  340: 	    }
1.18      albertel  341: 	    
1.16      albertel  342: 	    $image->setThickness($width);
1.18      albertel  343: 	    if ($added) {
1.21      albertel  344: 		if ($open && lc($open) ne 'no') {
1.18      albertel  345: 		    $image->polydraw($polygon,$imcolor);
1.21      albertel  346: 		} elsif ($filled && lc($filled) ne 'no') {
                    347: 		    $image->filledPolygon($polygon,$imcolor);
1.18      albertel  348: 		} else {
                    349: 		    $image->polygon($polygon,$imcolor);
                    350: 		}
1.16      albertel  351: 	    }
                    352: 	} elsif ($type eq 'ARC') {
                    353: 	    my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
1.24      albertel  354: 		split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  355: 	    if (!$color) { $color='000000'; }
                    356: 	    my $imcolor=&get_color_from_hexstring($image,$color);
                    357: 	    if (!defined($thickness)) { $thickness=1; }
                    358: 	    $image->setThickness($thickness);
                    359: #	    $image->setAntiAliased($imcolor);
                    360: 	    if ($filled) {
                    361: 		$image->filledArc($x,$y,$width,$height,$start,$end,
                    362: 				  $imcolor);
                    363: 	    } else {
                    364: 		$image->arc($x,$y,$width,$height,$start,$end,$imcolor);
                    365: 	    }
                    366: 	} elsif ($type eq 'FILL') {
1.24      albertel  367: 	    my ($x,$y,$color)=split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  368: 	    if (!$color) { $color='000000'; }
                    369: 	    my $imcolor=&get_color_from_hexstring($image,$color);
                    370: 	    $image->fill($x,$y,$imcolor);
                    371: 	} elsif ($type eq 'IMAGE') {
1.21      albertel  372: 	    my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
1.24      albertel  373: 		$srcH)=split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  374: 	    $file=&Apache::lonnet::unescape($file);
                    375: 	    if (!defined($transparent)) { $transparent=1; }
                    376: 	    my $subimage=&get_image($file,$transparent);
                    377: 	    if (!defined($subimage)) {
                    378: 		&Apache::lonnet::logthis('Unable to create image object for '.
                    379: 					 $file);
                    380: 		next;
                    381: 	    }
1.21      albertel  382: 	    if (!defined($srcW) or !$srcW) {$srcW=($subimage->getBounds())[0];}
                    383: 	    if (!defined($srcH) or !$srcH) {$srcH=($subimage->getBounds())[1];}
                    384: 	    if (!defined($destW) or !$destW) { $destW=$srcW; }
                    385: 	    if (!defined($destH) or !$destH) { $destH=$srcH; }
                    386: 	    $image->copyResized($subimage,$x,$y,$srcX,$srcY,$destW,$destH,
                    387: 				$srcW,$srcH);
1.16      albertel  388: 	} elsif ($type eq 'LABEL') {
1.19      albertel  389: 	    my ($x,$y,$text,$font,$color,$direction)=
1.24      albertel  390: 		split(':',$ENV{$prefix."OBJ$i"});
1.16      albertel  391: 	    $text=&Apache::lonnet::unescape($text);
                    392: 	    my $imcolor=&get_color_from_hexstring($image,$color);
1.19      albertel  393: 	    my $type='normal';
                    394: 	    my ($height,$fontref);
                    395: 	    if ($font eq 'tiny') {
                    396: 		$height=GD::Font->Tiny->height;
                    397: 		$fontref=GD::gdTinyFont;
                    398: 	    } elsif ($font eq 'small') {
                    399: 		$height=GD::Font->Small->height;
                    400: 		$fontref=GD::gdSmallFont;
                    401: 	    } elsif ($font eq 'medium') {
                    402: 		$height=GD::Font->MediumBold->height;
                    403: 		$fontref=GD::gdMediumBoldFont;
                    404: 	    } elsif ($font eq 'large') {
                    405: 		$height=GD::Font->Large->height;
                    406: 		$fontref=GD::gdLargeFont;
1.21      albertel  407: 	    } elsif ($font eq 'giant' || !$font) {
1.19      albertel  408: 		$height=GD::Font->Giant->height;
                    409: 		$fontref=GD::gdGiantFont;
                    410: 	    } else {
                    411: 		$type='ttf';
                    412: 	    }
                    413: 	    if ($type eq 'normal' && $direction eq 'vertical') {
                    414: 		$image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
                    415: 	    } elsif ($type eq 'normal') {
                    416: 		$image->string($fontref,$x,$y-$height,$text,$imcolor);
                    417: 	    } elsif ($type eq 'ttf') {
                    418: 		my ($fontname,$ptsize)=split(/\s+/,$font);
                    419: 		$image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
                    420: 	    }
1.18      albertel  421: 	} else {
                    422: 	    &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
1.13      albertel  423: 	}
1.10      albertel  424:     }
                    425:     $image->setThickness(1);
1.3       albertel  426:     $r->print($image->png);
1.1       albertel  427:     return OK;
                    428: }
                    429: 
                    430: 1;

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