Multiple Symbols and Breadcrumbs

[Antonio Agostini]

Hi All.

I want to display breadcrumbs showing a vehicle's route. Right now it works
with one symbol for all points.

How do I go about showing different symbols depending, for example, on the
vehicle heading?

I have 16 symbols defined in the map file, "bump0" to "bump15". Headings
are numbers from 0 to 15. At runtime I build the symbol name and change it
but it is only taking the last one and renders all points with that one.

Here's some of my map file and code. Any help is greatly appreciated. I'm
still learning and hope to contribute here very soon.

#16 symbols like this
SYMBOL
 NAME 'bump0'
 TYPE PIXMAP
 IMAGE 'images/bump-green-00.gif'
END

#This is the layer I currently use for rendering all with the same symbol
LAYER
 NAME 'GRAPHIC2'
 TYPE POINT
 MINSCALE 0
 MAXSCALE 55000000000
 STATUS ON
 FEATURE
 END
   CLASS
    STYLE
   SYMBOL 'images/bump8grn.GIF'
  END
 END
END

#PHP Code

//arr is an array with data like (lat,long,heading,lat,long,heading,etc...)
 $pos=0;
 $heading=-1;
 for ($i=0; $i < $size/3; $i++) {
  //
  $oShp=ms_newShapeObj(MS_SHAPE_LINE);
  $oLine=ms_newLineObj();
                // do this after the first point
  if ($pos>0) {
   if ($arr[$pos+2] <> $heading) {  //detect heading
change
    $heading = $arr[$pos+2];
    $mysymbol=$gpoMap->getSymbolByName
("bump".$heading);  //load this heading's symbol from map file
    $myClass = $dummylayer2->getClass(0);
    $mystyle = $myClass->getstyle(0);
    $mystyle->set("symbol", $mysymbol);
   }
   $oLine->addXY($arr[$pos+1],$arr[$pos]);

   $oShp->add($oLine);
   $dummylayer2->addfeature($oShp);

  }
  else  //do this for the first point
  {
   $oLine->addXY($arr[$pos+1],$arr[$pos]);

   $oShp->add($oLine);

   //Set the first point label
   $oShp->set("text",$Label);

   $dummylayer->addfeature($oShp);
  }
  $pos=$pos+3; //skip three places to the next point
  $oShp->free;
  $oLine->free;
 }