dynamic point generation with php-mapscript

[Dan Taylor]

This is how I do it.  Very basic though...

function addpoints($map, $name, $points, $r, $g, $b, $symbol,
$font_face, $font_size)
{
  // Create a layer
  $layer = ms_newLayerObj($map);
  $layer->set("type", MS_LAYER_POINT);
  $layer->set("name", $name);
  $layer->set("status", MS_ON);

  // Create the default class and set up label
  $cl = ms_newClassObj($layer);
  $cl->set("status", MS_ON);
  $cl->label->set("size", $font_size);
  $cl->label->set("type", "MS_TRUETYPE");
  $cl->label->set("font", $font_face);
  $cl->label->set("position", MS_LC);
  $cl->label->color->setRGB($r, $g, $b);
  $cl->label->outlinecolor->setRGB(0, 0, 0);

  // Create and set up style
  $sty = ms_newStyleObj($cl);
  $sty->set("symbolname", $symbol);
  $sty->color->setRGB($r, $g, $b);
  $sty->outlinecolor->setRGB(0, 0, 0);

  // Add points
  for($i = 0; $i < sizeof($points); $i++)
  {
    $point = ms_newPointObj();
    $point->setXY($points[$i]->x, $points[$i]->y);

    $line = ms_newLineObj();
    $line->add($point);

    $shape = ms_newShapeObj(MS_SHAPE_POINT);
    $shape->add($line);
    $shape->set("text", $points[$i]->text);

    $layer->addFeature($shape);
  }
}

Dan

On 4/15/05, Gavin Simpson <gavin.simpson at ucl.ac.uk> wrote:
> Wouter Schaubroeck wrote:
> > Hi,
> >
> > I was wondering if anyone would know some good examples of generating
> > dynamic points with php mapscript? For example: just pulling the points
> > from (in my case: a MySQL db) a database and displaying them without a
> > shape file? And is it possible to do queries on that layer, or
> > displaying the attribute data? I assume not, because there's no
> > associated dbf file.
> >
> > Best regards,
> >
> > Wouter Schaubroeck
> >
> >
> 
> See the PHP/Mapscript WIKI - which has such an example:
> 
> http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PHPMapScriptAddPoint
> 
> Querying that layer is more problematic. You need to create a shapeObj
> and addFeature()'s to that shapeObj etc:
> 
> http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PerlMapScriptExamples42ex1
> shows you how to do this with Perl which is easily translated to PHP (I
> did it yesterday but my code is in a mess of other trial stuff just
> now), with one major exception! PHP/Mapscript is broken at the moment
> and you can't set the index of a shapeObj added to a layer (it needs to
> be numeric, integer, incrementing in steps of 1 - so not a arbitrary
> ordering of ID's from a mysql table index, currently it returns -1
> error), which you need to have queryByPoint do anything useful etc. See:
> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=806
> 
> A patch has been accepted for this bug so you can download a nightly or
> the cvs of mapserver (or replace php_mapscript.c in the tarball of
> mapserver4.4.2 with the one in that bug report) and roll your own
> php_mapscript.so.
> 
> After a few errors I have just gotten this compiling as well (a
> nightly), so maybe I can query that layer after all... :-)
> 
> Please note - I'm a mapserver virgin so I've been bumbling through this
> for only a day or so - feel free to email me further about this but I
> can't guarantee I'll be able to help much beyond providing some very
> early php code.
> 
> G
> 
> --
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> Gavin Simpson                     [T] +44 (0)20 7679 5522
> ENSIS Research Fellow             [F] +44 (0)20 7679 7565
> ENSIS Ltd. & ECRC                 [E] gavin.simpsonATNOSPAMucl.ac.uk
> UCL Department of Geography       [W] http://www.ucl.ac.uk/~ucfagls/cv/
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> 


-- 
Dan Taylor

Software Development Engineer, JTL Systems Ltd
PhD Student, Reading University, UK

http://www.logicalgenetics.com