Re: [UMN_MAPSERVER-USERS] PHPMAPSCRITP Drawing a POINT !!!

[Robert Albrecht]

Alessandro MAZZELLA wrote:
Hi everybody,
 
    is it possible to draw a point (or a cross !!) over the mouseclick 
point ? Any idea ?
 
I use the following function to get the coordinates of a click on the map:
   public function pixelsToCoordinates($x, $y, $width, $height, $extent)
   {
       $dx = $x / $width;
       $dy = 1 - $y / $height;

       $x_georef = $extent->minx + ($extent->maxx - $extent->minx) * $dx;
       $y_georef = $extent->miny + ($extent->maxy - $extent->miny) * $dy;

       $point = ms_newPointObj();

       $point->setXY($x_georef, $y_georef);

       return $point;
   }

$x, $y is the point clicked on the image map, in pixels, from the top 
left corner.
$width, $height is the size of the image map.
$extent is the georeferenced extents of the image map.

To draw points you need to create a point layer:

$point_layer = ms_newLayerObj($mapObj);
$point_layer->set("status", MS_ON);
$point_layer->set("type", MS_LAYER_POINT);
$point_layer->set("transparency", MS_GD_ALPHA);
$class = ms_newClassObj($point_layer);
$class->set("status", MS_ON);
$style = ms_newStyleObj($class);
$style->set("symbolname", "/path/of/the/symbol/you/want/to/draw.gif");

and add the point:

       $point = ms_newPointObj();
       $point->setXY($x, $y);

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

       $shape = ms_newShapeObj(MS_SHAPE_POINT);
       $shape->set("classindex", 0);
       $shape->add($line);

       $point_layer->addFeature($shape);

It's a bit complicated, but I don't know any easier way to do it.

Regards,
Robert Albrecht