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[LON-CAPA] /
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homework /
imagechoice.pm
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1.9:
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Thu Aug 25 19:33:14 2005 UTC (18 years, 9 months ago) by
albertel
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MAIN
CVS tags:
version_2_1_X,
version_2_1_3,
version_2_1_2,
version_2_1_1,
version_2_1_0,
version_2_0_X,
version_2_0_99_1,
version_2_0_2,
version_2_0_1,
HEAD
- BUG#4277 work around bug in safari
1: # $Id: imagechoice.pm,v 1.9 2005/08/25 19:33:14 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: use Apache::lonnet;
29:
30: sub deletedata {
31: my ($id)=@_;
32: &Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
33: }
34:
35: sub closewindow {
36: my ($r,$output,$filename,$needimage,$display)=@_;
37: if ($needimage) {
38: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
39: }
40: $r->print(<<"ENDSUBM");
41: <html>
42: <script>
43: function submitthis() {
44: $output
45: self.close();
46: }
47: </script>
48: <body bgcolor="#FFFFFF" onLoad="submitthis()">
49: <h3>Position Selected</h3>
50: $display
51: $needimage
52: </body>
53: </html>
54: ENDSUBM
55: }
56:
57: sub storedata {
58: my ($r,$type,$filename,$id)=@_;
59:
60: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
61:
62: my ($output,$needimage);
63:
64: if ($env{"imagechoice.$id.formwidth"}) {
65: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
66: $needimage=1;
67: }
68: if ($env{"imagechoice.$id.formheight"}) {
69: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
70: $needimage=1;
71: }
72:
73: my $display;
74: if ($type eq 'point') {
75: my (undef,$x,$y)=split(':',$env{"imagechoice.$id.coords"});
76: if ($env{"imagechoice.$id.formx"}) {
77: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formx"}.'.value='.$x.';';
78: $display.="<p>The X coordinate is $x</p>\n";
79: }
80: if ($env{"imagechoice.$id.formy"}) {
81: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';';
82: $display.="<p>The Y coordinate is $y</p>\n";
83: }
84: } elsif ($type eq 'polygon' or $type eq 'box') {
85: my $coordstr;
86: while (@coords) {
87: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
88: }
89: chop($coordstr);
90: $display.="<p>The selected coordinates are <tt>$coordstr</tt></p>\n";
91: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
92: }
93: if ($display) {
94: $display.="<p>If this window fails to close you may need to manually replace the old coordinates with the above value.</p>\n";
95: }
96: &deletedata($id);
97: &closewindow($r,$output,$filename,$needimage,$display);
98: }
99:
100: sub getcoord {
101: my ($r,$type,$filename,$id)=@_;
102: my $heading='Select Position on Image';
103: my $nextstage='';
104: if ($type eq 'box') {
105: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
106: my $step=scalar(@coords)/2;
107: if ($step == 0) {
108: $heading='Select First Coordinate on Image';
109: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
110: } elsif ($step == 1) {
111: $heading='Select Second Coordinate on Image';
112: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
113: } else {
114: $heading='Select Finish to store selection.';
115: $nextstage='<input type="submit" name="finish" value="Finish" />';
116: }
117: } elsif ($type eq 'polygon') {
118: $heading='Enter Coordinate or click finish to close Polygon';
119: $nextstage='<input type="submit" name="finish" value="Finish" />';
120: } elsif ($type eq 'point') {
121: $heading='Click to select a Coordinate or click Finish to store current selection.';
122: $nextstage='<input type="submit" name="finish" value="Finish" />';
123: }
124: $r->print(<<"END");
125: <html>
126: <body bgcolor="#FFFFFF">
127: <h3>$heading</h3>
128: <form method="POST" action="/adm/imagechoice?token=$id">
129: $nextstage
130: <input type="submit" name="cancel" value="Cancel" />
131: <br />
132: <input name="image" type="image" src="$filename" />
133: </form>
134: </body>
135: </html>
136: END
137: }
138:
139: sub savecoord {
140: my ($id,$type)=@_;
141: if (defined($env{"form.image.x"}) && defined($env{"form.image.y"})) {
142: my $data;
143: if ($type eq 'point') {
144: $data=join(':',(undef,$env{"form.image.x"},$env{"form.image.y"}));
145: } else {
146: $data=join(':',($env{"imagechoice.$id.coords"},
147: $env{"form.image.x"},$env{"form.image.y"}));
148: }
149: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
150: }
151: return int(scalar(split(':',$env{"imagechoice.$id.coords"}))/2);
152: }
153:
154: sub add_obj {
155: my ($x,$id,$type,$args,$extra)=@_;
156:
157: $$x{"cgi.$id.OBJTYPE"}.=$type.':';
158: my $i=$$x{"cgi.$id.OBJCOUNT"}++;
159: $$x{"cgi.$id.OBJ$i"}=$args;
160: if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; }
161: }
162:
163: sub drawX {
164: my ($data,$imid,$x,$y)=@_;
165: my $length = 6;
166: my $width = 1;
167: my $extrawidth = 2;
168: &add_obj($data,$imid,'LINE',
169: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
170: "FFFFFF",($width+$extrawidth))));
171: &add_obj($data,$imid,'LINE',
172: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
173: "FFFFFF",($width+$extrawidth))));
174: &add_obj($data,$imid,'LINE',
175: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
176: "FF0000",($width))));
177: &add_obj($data,$imid,'LINE',
178: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
179: "FF0000",($width))));
180: }
181:
182: sub drawPolygon {
183: my ($data,$id,$imid)=@_;
184: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
185: my $coordstr;
186: while (@coords) {
187: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
188: }
189: chop($coordstr);
190: my $width = 1;
191: my $extrawidth = 2;
192: &add_obj($data,$imid,'POLYGON',
193: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
194: &add_obj($data,$imid,'POLYGON',
195: join(':',("00FF00",($width)),'1'),$coordstr);
196: }
197:
198: sub drawBox {
199: my ($data,$id,$imid)=@_;
200: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
201: if (scalar(@coords) < 4) { return ''; }
202: my $width = 1;
203: my $extrawidth = 2;
204: &add_obj($data,$imid,'RECTANGLE',
205: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
206: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
207: }
208:
209: sub drawimage {
210: my ($r,$type,$filename,$id)=@_;
211: my $imid=&Apache::loncommon::get_cgi_id();
212: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
213: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
214: my %data;
215: $data{"cgi.$imid.BGIMG"}=$filename;
216: my $x=$coords[-2];
217: my $y=$coords[-1];
218: &drawX(\%data,$imid,$x,$y);
219: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
220: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
221: &Apache::lonnet::appenv(%data);
222: return "/adm/randomlabel.png?token=$imid"
223: }
224:
225: sub handler {
226: my ($r)=@_;
227: &Apache::loncommon::content_type($r,'text/html');
228: $r->send_http_header;
229: my %data;
230: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
231: my $filename = &Apache::lonnet::unescape($env{"imagechoice.$id.file"});
232: my $formname = $env{"imagechoice.$id.formname"};
233: if ($env{'form.cancel'} eq 'Cancel') {
234: &deletedata($id);
235: &closewindow($r,'',$filename);
236: return OK;
237: }
238: my $type=$env{"imagechoice.$id.type"};
239: if (defined($env{'form.type'})) { $type=$env{'form.type'}; }
240: my $numcoords=&savecoord($id,$type);
241: my $imurl=&drawimage($r,$type,$filename,$id);
242: if (($env{'form.finish'} eq 'Finish')) {
243: &storedata($r,$type,$imurl,$id);
244: } else {
245: &getcoord($r,$type,$imurl,$id);
246: }
247: return OK;
248: }
249:
250: 1;
251:
252: __END__
253:
254:
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