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[LON-CAPA] /
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imagechoice.pm
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Mon Jan 12 19:53:54 2004 UTC (20 years, 3 months ago) by
albertel
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- polygons set the request width now
- imagechoice stores its data where it won't be thrown away before we are ready
- imageresponse tries to cleanup after itself
- lonnet::hreflocation() understands what to do with /home references
- relative image URLs work now
1: # $Id: imagechoice.pm,v 1.2 2004/01/12 19:53:54 albertel Exp $
2: #
3: # Copyright Michigan State University Board of Trustees
4: #
5: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
6: #
7: # LON-CAPA is free software; you can redistribute it and/or modify
8: # it under the terms of the GNU General Public License as published by
9: # the Free Software Foundation; either version 2 of the License, or
10: # (at your option) any later version.
11: #
12: # LON-CAPA is distributed in the hope that it will be useful,
13: # but WITHOUT ANY WARRANTY; without even the implied warranty of
14: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: # GNU General Public License for more details.
16: #
17: # You should have received a copy of the GNU General Public License
18: # along with LON-CAPA; if not, write to the Free Software
19: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: #
21: # /home/httpd/cgi-bin/plot.gif
22: #
23: # http://www.lon-capa.org/
24: #
25: package Apache::imagechoice;
26: use strict;
27: use Apache::Constants qw(:common :http);
28:
29:
30: sub deletedata {
31: my ($id)=@_;
32: &Apache::lonnet::delenv("imagechoice\\.$id");
33: }
34:
35: sub closewindow {
36: my ($r,$output,$filename)=@_;
37: $r->print(<<"ENDSUBM");
38: <html>
39: <script>
40: function submitthis() {
41: $output
42: self.close();
43: }
44: </script>
45: <body bgcolor="#FFFFFF" onLoad="submitthis()">
46: <h3>Position Selected</h3>
47: <!--<img name="pickimg" src="$filename" />-->
48: </body>
49: </html>
50: ENDSUBM
51: }
52:
53: sub storedata {
54: my ($r,$mode,$filename,$id)=@_;
55:
56: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
57:
58: my $output;
59:
60: if ($ENV{"imagechoice.$id.formwidth"}) {
61: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
62: }
63: if ($ENV{"imagechoice.$id.formheight"}) {
64: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
65: }
66:
67: if ((defined($ENV{"imagechoice.$id.x"})) && (defined($ENV{"imagechoice.$id.y"})) &&
68: ($mode ne 'pairtwo') && ($mode ne 'pairthree')) {
69: my $output='';
70: if ($ENV{"imagechoice.$id.formx"}) {
71: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formx"}.
72: '.value='.$ENV{"imagechoice.$id.x"}.';';
73: }
74: if ($ENV{"imagechoice.$id.formy"}) {
75: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formy"}.
76: '.value='.$ENV{"imagechoice.$id.y"}.';';
77: }
78: } elsif ($mode eq 'pairthree') {
79: my $output='';
80: my $outputpair='('.$ENV{"imagechoice.$id.selx"}.','.$ENV{"imagechoice.$id.sely"}.')-('.$ENV{"imagechoice.$id.x"}.','.$ENV{"imagechoice.$id.y"}.')';
81:
82: if ($ENV{"imagechoice.$id.formcoord"}) {
83: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formcoord"}.
84: '.value="'.$outputpair.'";';
85: }
86: } elsif ($mode eq 'polygon') {
87: my $coordstr;
88: while (@coords) {
89: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
90: }
91: chop($coordstr);
92: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
93: }
94: &deletedata($id);
95: &closewindow($r,$output,$filename);
96: }
97:
98: sub getcoord {
99: my ($r,$mode,$filename,$id)=@_;
100: my $heading='Position';
101: my $nextstage='';
102: if ($mode eq 'pair') {
103: $heading='First Coordinate';
104: $nextstage='<input type="hidden" name="mode" value="pairtwo" />';
105: } elsif ($mode eq 'pairtwo') {
106: $heading='Second Coordinate';
107: $nextstage='<input type="hidden" name="mode" value="pairthree" />';
108: } elsif ($mode eq 'polygon') {
109: $heading='Enter Coordinate or click finish to close Polygon';
110: $nextstage='<input type="submit" name="finish" value="Finish" />';
111: }
112: $r->print(<<"END");
113: <html>
114: <body bgcolor="#FFFFFF">
115: <h3>Select $heading on Image</h3>
116: <form method="POST" action="/adm/imagechoice?token=$id">
117: $nextstage
118: <input type="submit" name="cancel" value="Cancel" />
119: <br />
120: <input name="image" type="image" src="$filename" />
121: </form>
122: </body>
123: </html>
124: END
125: }
126:
127: sub savecoord {
128: my ($id)=@_;
129: if (defined($ENV{"form.image.x"}) && defined($ENV{"form.image.y"})) {
130: my $data=join(':',($ENV{"imagechoice.$id.coords"},$ENV{"form.image.x"},
131: $ENV{"form.image.y"}));
132: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
133: }
134: }
135:
136: sub drawX {
137: my ($imid,$x,$y)=@_;
138: my %x;
139: $x{"cgi.$imid.LINECOUNT"}=4;
140: my $length = 6;
141: my $width = 1;
142: my $extrawidth = 2;
143: $x{"cgi.$imid.LINE0"}=
144: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
145: "FFFFFF",($width+$extrawidth)));
146: $x{"cgi.$imid.LINE1"}=
147: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
148: "FFFFFF",($width+$extrawidth)));
149: $x{"cgi.$imid.LINE2"}=
150: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
151: "FF0000",($width)));
152: $x{"cgi.$imid.LINE3"}=
153: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
154: "FF0000",($width)));
155: return %x;
156: }
157:
158: sub drawPolygon {
159: my ($id,$imid)=@_;
160: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
161: my $coordstr;
162: while (@coords) {
163: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
164: }
165: chop($coordstr);
166: my %x;
167: my $width = 1;
168: my $extrawidth = 2;
169: my $i=$x{"cgi.$imid.POLYCOUNT"}++;
170: $x{"cgi.$imid.POLYOPT$i"}=join(':',("FFFFFF",($width+$extrawidth)),'1');
171: $x{"cgi.$imid.POLY$i"}=$coordstr;
172: $i=$x{"cgi.$imid.POLYCOUNT"}++;
173: $x{"cgi.$imid.POLYOPT$i"}=join(':',("00FF00",$width),'1');
174: $x{"cgi.$imid.POLY$i"}=$coordstr;
175: return %x;
176: }
177:
178: sub drawimage {
179: my ($r,$mode,$filename,$id)=@_;
180: my $imid=&Apache::loncommon::get_cgi_id();
181: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
182: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
183: my %data;
184: $data{"cgi.$imid.BGIMG"}=$filename;
185: my $x=@coords[-2];
186: my $y=@coords[-1];
187: %data=(%data,&drawX($imid,$x,$y));
188: if ($mode eq "polygon") { %data=(%data,&drawPolygon($id,$imid)); }
189: &Apache::lonnet::appenv(%data);
190: return "/adm/randomlabel.png?token=$imid"
191: }
192:
193: sub handler {
194: my ($r)=@_;
195: $r->content_type('text/html');
196: my %data;
197: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
198: my $filename = &Apache::lonnet::unescape($ENV{"imagechoice.$id.file"});
199: my $formname = $ENV{"imagechoice.$id.formname"};
200: my $mode=$ENV{"imagechoice.$id.mode"};
201: if ($ENV{'form.cancel'} eq 'Cancel') {
202: &deletedata($id);
203: &closewindow($r,'',$filename);
204: }
205: &savecoord($id);
206: my $imurl=&drawimage($r,$mode,$filename,$id);
207: if ($ENV{'form.finish'} eq 'Finish') {
208: &storedata($r,$mode,$imurl,$id);
209: }
210: &getcoord($r,$mode,$imurl,$id);
211: return OK;
212: }
213:
214: 1;
215:
216: __END__
217:
218:
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