Annotation of loncom/homework/imagechoice.pm, revision 1.9
1.9 ! albertel 1: # $Id: imagechoice.pm,v 1.8 2005/04/07 06:56:21 albertel Exp $
1.1 albertel 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);
1.8 albertel 28: use Apache::lonnet;
1.1 albertel 29:
1.2 albertel 30: sub deletedata {
31: my ($id)=@_;
1.3 albertel 32: &Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
1.2 albertel 33: }
1.1 albertel 34:
35: sub closewindow {
1.9 ! albertel 36: my ($r,$output,$filename,$needimage,$display)=@_;
1.4 albertel 37: if ($needimage) {
38: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
39: }
1.1 albertel 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>
1.9 ! albertel 50: $display
1.4 albertel 51: $needimage
1.1 albertel 52: </body>
53: </html>
54: ENDSUBM
55: }
56:
57: sub storedata {
1.3 albertel 58: my ($r,$type,$filename,$id)=@_;
1.1 albertel 59:
1.8 albertel 60: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.1 albertel 61:
1.4 albertel 62: my ($output,$needimage);
1.1 albertel 63:
1.8 albertel 64: if ($env{"imagechoice.$id.formwidth"}) {
65: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
1.4 albertel 66: $needimage=1;
1.1 albertel 67: }
1.8 albertel 68: if ($env{"imagechoice.$id.formheight"}) {
69: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
1.4 albertel 70: $needimage=1;
1.1 albertel 71: }
72:
1.9 ! albertel 73: my $display;
1.4 albertel 74: if ($type eq 'point') {
1.8 albertel 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.';';
1.9 ! albertel 78: $display.="<p>The X coordinate is $x</p>\n";
1.1 albertel 79: }
1.8 albertel 80: if ($env{"imagechoice.$id.formy"}) {
81: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';';
1.9 ! albertel 82: $display.="<p>The Y coordinate is $y</p>\n";
1.1 albertel 83: }
1.3 albertel 84: } elsif ($type eq 'polygon' or $type eq 'box') {
1.1 albertel 85: my $coordstr;
86: while (@coords) {
87: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
88: }
89: chop($coordstr);
1.9 ! albertel 90: $display.="<p>The selected coordinates are <tt>$coordstr</tt></p>\n";
1.8 albertel 91: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
1.1 albertel 92: }
1.9 ! albertel 93: if ($display) {
! 94: $display.="<p>If this window fails to close you may need to manually replace the old coordinates with the above value.</p>\n";
! 95: }
1.2 albertel 96: &deletedata($id);
1.9 ! albertel 97: &closewindow($r,$output,$filename,$needimage,$display);
1.1 albertel 98: }
99:
100: sub getcoord {
1.3 albertel 101: my ($r,$type,$filename,$id)=@_;
1.4 albertel 102: my $heading='Select Position on Image';
1.1 albertel 103: my $nextstage='';
1.3 albertel 104: if ($type eq 'box') {
1.8 albertel 105: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.3 albertel 106: my $step=scalar(@coords)/2;
107: if ($step == 0) {
1.4 albertel 108: $heading='Select First Coordinate on Image';
1.3 albertel 109: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
110: } elsif ($step == 1) {
1.4 albertel 111: $heading='Select Second Coordinate on Image';
1.3 albertel 112: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
113: } else {
1.4 albertel 114: $heading='Select Finish to store selection.';
1.3 albertel 115: $nextstage='<input type="submit" name="finish" value="Finish" />';
116: }
117: } elsif ($type eq 'polygon') {
1.1 albertel 118: $heading='Enter Coordinate or click finish to close Polygon';
119: $nextstage='<input type="submit" name="finish" value="Finish" />';
1.4 albertel 120: } elsif ($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" />';
1.1 albertel 123: }
124: $r->print(<<"END");
125: <html>
126: <body bgcolor="#FFFFFF">
1.4 albertel 127: <h3>$heading</h3>
1.1 albertel 128: <form method="POST" action="/adm/imagechoice?token=$id">
129: $nextstage
1.2 albertel 130: <input type="submit" name="cancel" value="Cancel" />
131: <br />
1.1 albertel 132: <input name="image" type="image" src="$filename" />
133: </form>
134: </body>
135: </html>
136: END
137: }
138:
139: sub savecoord {
1.4 albertel 140: my ($id,$type)=@_;
1.8 albertel 141: if (defined($env{"form.image.x"}) && defined($env{"form.image.y"})) {
1.4 albertel 142: my $data;
143: if ($type eq 'point') {
1.8 albertel 144: $data=join(':',(undef,$env{"form.image.x"},$env{"form.image.y"}));
1.4 albertel 145: } else {
1.8 albertel 146: $data=join(':',($env{"imagechoice.$id.coords"},
147: $env{"form.image.x"},$env{"form.image.y"}));
1.4 albertel 148: }
1.2 albertel 149: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
1.1 albertel 150: }
1.8 albertel 151: return int(scalar(split(':',$env{"imagechoice.$id.coords"}))/2);
1.1 albertel 152: }
153:
1.5 albertel 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"}=$extra; }
161: }
162:
1.1 albertel 163: sub drawX {
1.5 albertel 164: my ($data,$imid,$x,$y)=@_;
1.1 albertel 165: my $length = 6;
166: my $width = 1;
167: my $extrawidth = 2;
1.5 albertel 168: &add_obj($data,$imid,'LINE',
169: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
170: "FFFFFF",($width+$extrawidth))));
171: &add_obj($data,$imid,'LINE',
1.1 albertel 172: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
1.5 albertel 173: "FFFFFF",($width+$extrawidth))));
174: &add_obj($data,$imid,'LINE',
1.1 albertel 175: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
1.5 albertel 176: "FF0000",($width))));
177: &add_obj($data,$imid,'LINE',
1.1 albertel 178: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
1.5 albertel 179: "FF0000",($width))));
1.1 albertel 180: }
181:
182: sub drawPolygon {
1.5 albertel 183: my ($data,$id,$imid)=@_;
1.8 albertel 184: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.1 albertel 185: my $coordstr;
186: while (@coords) {
187: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
188: }
189: chop($coordstr);
190: my $width = 1;
191: my $extrawidth = 2;
1.5 albertel 192: &add_obj($data,$imid,'POLYGON',
193: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
194: &add_obj($data,$imid,'POLYGON',
195: join(':',("00FF00",($width)),'1'),$coordstr);
1.1 albertel 196: }
197:
1.3 albertel 198: sub drawBox {
1.5 albertel 199: my ($data,$id,$imid)=@_;
1.8 albertel 200: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.5 albertel 201: if (scalar(@coords) < 4) { return ''; }
1.3 albertel 202: my $width = 1;
203: my $extrawidth = 2;
1.5 albertel 204: &add_obj($data,$imid,'RECTANGLE',
205: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
206: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
1.3 albertel 207: }
208:
1.1 albertel 209: sub drawimage {
1.3 albertel 210: my ($r,$type,$filename,$id)=@_;
1.1 albertel 211: my $imid=&Apache::loncommon::get_cgi_id();
1.8 albertel 212: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.2 albertel 213: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
1.1 albertel 214: my %data;
215: $data{"cgi.$imid.BGIMG"}=$filename;
1.3 albertel 216: my $x=$coords[-2];
217: my $y=$coords[-1];
1.5 albertel 218: &drawX(\%data,$imid,$x,$y);
219: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
220: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
1.1 albertel 221: &Apache::lonnet::appenv(%data);
222: return "/adm/randomlabel.png?token=$imid"
223: }
224:
225: sub handler {
226: my ($r)=@_;
1.7 albertel 227: &Apache::loncommon::content_type($r,'text/html');
228: $r->send_http_header;
1.1 albertel 229: my %data;
230: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.8 albertel 231: my $filename = &Apache::lonnet::unescape($env{"imagechoice.$id.file"});
232: my $formname = $env{"imagechoice.$id.formname"};
233: if ($env{'form.cancel'} eq 'Cancel') {
1.2 albertel 234: &deletedata($id);
235: &closewindow($r,'',$filename);
1.3 albertel 236: return OK;
1.2 albertel 237: }
1.8 albertel 238: my $type=$env{"imagechoice.$id.type"};
239: if (defined($env{'form.type'})) { $type=$env{'form.type'}; }
1.4 albertel 240: my $numcoords=&savecoord($id,$type);
1.3 albertel 241: my $imurl=&drawimage($r,$type,$filename,$id);
1.8 albertel 242: if (($env{'form.finish'} eq 'Finish')) {
1.3 albertel 243: &storedata($r,$type,$imurl,$id);
244: } else {
245: &getcoord($r,$type,$imurl,$id);
1.1 albertel 246: }
247: return OK;
248: }
249:
250: 1;
251:
252: __END__
253:
254:
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