Annotation of loncom/homework/imagechoice.pm, revision 1.12
1.12 ! albertel 1: # $Id: imagechoice.pm,v 1.11 2006/05/30 12:45:37 www 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;
1.11 www 29: use LONCAPA;
30:
1.1 albertel 31:
1.2 albertel 32: sub deletedata {
33: my ($id)=@_;
1.3 albertel 34: &Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
1.2 albertel 35: }
1.1 albertel 36:
37: sub closewindow {
1.9 albertel 38: my ($r,$output,$filename,$needimage,$display)=@_;
1.4 albertel 39: if ($needimage) {
40: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
41: }
1.10 albertel 42: my $js=<<"ENDSUBM";
43: <script type="text/javascript">
1.1 albertel 44: function submitthis() {
45: $output
46: self.close();
47: }
48: </script>
1.10 albertel 49: ENDSUBM
50:
51: my $start_page =
52: &Apache::loncommon::start_page('Close Window',$js,
53: {'bgcolor' => '#FFFFFF',
54: 'only_body' => 1,
55: 'add_entries' => {
56: onload => 'submitthis();'},});
57:
58: my $end_page =
59: &Apache::loncommon::end_page();
60:
1.12 ! albertel 61: $r->print(<<"ENDSUBM");
1.10 albertel 62: $start_page
1.1 albertel 63: <h3>Position Selected</h3>
1.9 albertel 64: $display
1.4 albertel 65: $needimage
1.10 albertel 66: $end_page
1.1 albertel 67: ENDSUBM
68: }
69:
70: sub storedata {
1.3 albertel 71: my ($r,$type,$filename,$id)=@_;
1.1 albertel 72:
1.8 albertel 73: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.1 albertel 74:
1.4 albertel 75: my ($output,$needimage);
1.1 albertel 76:
1.8 albertel 77: if ($env{"imagechoice.$id.formwidth"}) {
78: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
1.4 albertel 79: $needimage=1;
1.1 albertel 80: }
1.8 albertel 81: if ($env{"imagechoice.$id.formheight"}) {
82: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
1.4 albertel 83: $needimage=1;
1.1 albertel 84: }
85:
1.9 albertel 86: my $display;
1.4 albertel 87: if ($type eq 'point') {
1.8 albertel 88: my (undef,$x,$y)=split(':',$env{"imagechoice.$id.coords"});
89: if ($env{"imagechoice.$id.formx"}) {
90: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formx"}.'.value='.$x.';';
1.9 albertel 91: $display.="<p>The X coordinate is $x</p>\n";
1.1 albertel 92: }
1.8 albertel 93: if ($env{"imagechoice.$id.formy"}) {
94: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';';
1.9 albertel 95: $display.="<p>The Y coordinate is $y</p>\n";
1.1 albertel 96: }
1.3 albertel 97: } elsif ($type eq 'polygon' or $type eq 'box') {
1.1 albertel 98: my $coordstr;
99: while (@coords) {
100: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
101: }
102: chop($coordstr);
1.9 albertel 103: $display.="<p>The selected coordinates are <tt>$coordstr</tt></p>\n";
1.8 albertel 104: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
1.1 albertel 105: }
1.9 albertel 106: if ($display) {
107: $display.="<p>If this window fails to close you may need to manually replace the old coordinates with the above value.</p>\n";
108: }
1.2 albertel 109: &deletedata($id);
1.9 albertel 110: &closewindow($r,$output,$filename,$needimage,$display);
1.1 albertel 111: }
112:
113: sub getcoord {
1.3 albertel 114: my ($r,$type,$filename,$id)=@_;
1.4 albertel 115: my $heading='Select Position on Image';
1.1 albertel 116: my $nextstage='';
1.3 albertel 117: if ($type eq 'box') {
1.8 albertel 118: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.3 albertel 119: my $step=scalar(@coords)/2;
120: if ($step == 0) {
1.4 albertel 121: $heading='Select First Coordinate on Image';
1.3 albertel 122: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
123: } elsif ($step == 1) {
1.4 albertel 124: $heading='Select Second Coordinate on Image';
1.3 albertel 125: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
126: } else {
1.4 albertel 127: $heading='Select Finish to store selection.';
1.3 albertel 128: $nextstage='<input type="submit" name="finish" value="Finish" />';
129: }
130: } elsif ($type eq 'polygon') {
1.1 albertel 131: $heading='Enter Coordinate or click finish to close Polygon';
132: $nextstage='<input type="submit" name="finish" value="Finish" />';
1.4 albertel 133: } elsif ($type eq 'point') {
134: $heading='Click to select a Coordinate or click Finish to store current selection.';
135: $nextstage='<input type="submit" name="finish" value="Finish" />';
1.1 albertel 136: }
1.10 albertel 137:
138: my $start_page =
139: &Apache::loncommon::start_page('Get Coordinates',undef,
140: {'bgcolor' => '#FFFFFF',
141: 'only_body' => 1,});
142:
143: my $end_page =
144: &Apache::loncommon::end_page();
1.1 albertel 145: $r->print(<<"END");
1.10 albertel 146: $start_page
1.4 albertel 147: <h3>$heading</h3>
1.1 albertel 148: <form method="POST" action="/adm/imagechoice?token=$id">
149: $nextstage
1.2 albertel 150: <input type="submit" name="cancel" value="Cancel" />
151: <br />
1.1 albertel 152: <input name="image" type="image" src="$filename" />
153: </form>
1.10 albertel 154: $end_page
1.1 albertel 155: END
156: }
157:
158: sub savecoord {
1.4 albertel 159: my ($id,$type)=@_;
1.8 albertel 160: if (defined($env{"form.image.x"}) && defined($env{"form.image.y"})) {
1.4 albertel 161: my $data;
162: if ($type eq 'point') {
1.8 albertel 163: $data=join(':',(undef,$env{"form.image.x"},$env{"form.image.y"}));
1.4 albertel 164: } else {
1.8 albertel 165: $data=join(':',($env{"imagechoice.$id.coords"},
166: $env{"form.image.x"},$env{"form.image.y"}));
1.4 albertel 167: }
1.2 albertel 168: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
1.1 albertel 169: }
1.8 albertel 170: return int(scalar(split(':',$env{"imagechoice.$id.coords"}))/2);
1.1 albertel 171: }
172:
1.5 albertel 173: sub add_obj {
174: my ($x,$id,$type,$args,$extra)=@_;
175:
176: $$x{"cgi.$id.OBJTYPE"}.=$type.':';
177: my $i=$$x{"cgi.$id.OBJCOUNT"}++;
178: $$x{"cgi.$id.OBJ$i"}=$args;
179: if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; }
180: }
181:
1.1 albertel 182: sub drawX {
1.5 albertel 183: my ($data,$imid,$x,$y)=@_;
1.1 albertel 184: my $length = 6;
185: my $width = 1;
186: my $extrawidth = 2;
1.5 albertel 187: &add_obj($data,$imid,'LINE',
188: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
189: "FFFFFF",($width+$extrawidth))));
190: &add_obj($data,$imid,'LINE',
1.1 albertel 191: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
1.5 albertel 192: "FFFFFF",($width+$extrawidth))));
193: &add_obj($data,$imid,'LINE',
1.1 albertel 194: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
1.5 albertel 195: "FF0000",($width))));
196: &add_obj($data,$imid,'LINE',
1.1 albertel 197: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
1.5 albertel 198: "FF0000",($width))));
1.1 albertel 199: }
200:
201: sub drawPolygon {
1.5 albertel 202: my ($data,$id,$imid)=@_;
1.8 albertel 203: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.1 albertel 204: my $coordstr;
205: while (@coords) {
206: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
207: }
208: chop($coordstr);
209: my $width = 1;
210: my $extrawidth = 2;
1.5 albertel 211: &add_obj($data,$imid,'POLYGON',
212: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
213: &add_obj($data,$imid,'POLYGON',
214: join(':',("00FF00",($width)),'1'),$coordstr);
1.1 albertel 215: }
216:
1.3 albertel 217: sub drawBox {
1.5 albertel 218: my ($data,$id,$imid)=@_;
1.8 albertel 219: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.5 albertel 220: if (scalar(@coords) < 4) { return ''; }
1.3 albertel 221: my $width = 1;
222: my $extrawidth = 2;
1.5 albertel 223: &add_obj($data,$imid,'RECTANGLE',
224: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
225: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
1.3 albertel 226: }
227:
1.1 albertel 228: sub drawimage {
1.3 albertel 229: my ($r,$type,$filename,$id)=@_;
1.1 albertel 230: my $imid=&Apache::loncommon::get_cgi_id();
1.8 albertel 231: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
1.2 albertel 232: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
1.1 albertel 233: my %data;
234: $data{"cgi.$imid.BGIMG"}=$filename;
1.3 albertel 235: my $x=$coords[-2];
236: my $y=$coords[-1];
1.5 albertel 237: &drawX(\%data,$imid,$x,$y);
238: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
239: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
1.1 albertel 240: &Apache::lonnet::appenv(%data);
241: return "/adm/randomlabel.png?token=$imid"
242: }
243:
244: sub handler {
245: my ($r)=@_;
1.7 albertel 246: &Apache::loncommon::content_type($r,'text/html');
247: $r->send_http_header;
1.1 albertel 248: my %data;
249: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.11 www 250: my $filename = &unescape($env{"imagechoice.$id.file"});
1.8 albertel 251: my $formname = $env{"imagechoice.$id.formname"};
252: if ($env{'form.cancel'} eq 'Cancel') {
1.2 albertel 253: &deletedata($id);
254: &closewindow($r,'',$filename);
1.3 albertel 255: return OK;
1.2 albertel 256: }
1.8 albertel 257: my $type=$env{"imagechoice.$id.type"};
258: if (defined($env{'form.type'})) { $type=$env{'form.type'}; }
1.4 albertel 259: my $numcoords=&savecoord($id,$type);
1.3 albertel 260: my $imurl=&drawimage($r,$type,$filename,$id);
1.8 albertel 261: if (($env{'form.finish'} eq 'Finish')) {
1.3 albertel 262: &storedata($r,$type,$imurl,$id);
263: } else {
264: &getcoord($r,$type,$imurl,$id);
1.1 albertel 265: }
266: return OK;
267: }
268:
269: 1;
270:
271: __END__
272:
273:
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