[Mapserver-users] Need Urgent Help on PHP/MapScript >> ms_newPointObj()

Mon Jul 19 21:27:07 EDT 2004

You can also make a copy of an existing layer on the fly with a new name 
that way you don't have to build a whole new layer from scratch. That's how 
I put geocoded points onto a map. I have a construction layer and I just 
make copies of it as I need new layers that way the only thing I have to 
change is the color of the symbol. I have the symbol of that layer as a star 
so they geocode one textfile of addresses red and the next one blue etc so 
they can look at the stars from different files at the same time. Each set 
of different colored stars is simply a copy of that construction layer with 
the symbol color changed.

It looks something like this psuedo code:

//draw the map with all your mapfile layers
$img = $oMap->draw();

//get the dummy point layer
$oConsLayer = $oMap->getLayerByName("Construction");

//make a copy of it
$oConsLayer1 = ms_newLayerObj($oMap, $oConsLayer);

//give it a name
$oConsLayer1->set("name", "Red Points");

//get the class object
$oClass = $oConsLayer1->getClass(0);

//add the color to the map in case it's not there
$colorId = $oMap->addColor(255,0,0);

//set your new color
$oClass->set("color", $colorId);

//make a new point and give it coords
$m_Point = ms_newPointObj();
$m_Point->setXY($SomeX, $SomeY );

//draw the point
$m_Point->draw($oMap, $oConsLayer1, $ img,  0, $StringToDisplay);

I may be forgetting some steps but that should be roughly what you need to 
do to create a copy of an existing layer with a new color for the symbol.

>From: Merlos <merlos at tsc.uvigo.es>
>Reply-To: merlos at tsc.uvigo.es
>To: Ishrar Hussain <ishrarh at yahoo.com>
>C$oConsLayer1C: mapserver-users at lists.gis.umn.edu
>Subject: Re: [Mapserver-users] Need Urgent Help on PHP/MapScript  >> 
>ms_newPointObj()
>Date: Tue, 20 Jul 2004 01:34:28 +0200
>
>After making some tests, I think that if you want to create a new layer on
>the fly you have to create using mapscript a new style and a new class as
>well. On my tests, I removed the style of the INLINE layer and the result 
>was
>that it dissapeared on the map image, it seems that there is no default 
>style
>and class set.
>
>  I'm quite newbie, so maybe a phpmascript guru can corroborate my beliefs
>
>  Anywat, why don't you add an empty layer as I did?  That way you will 
>save
>coding time :-)
>
>Here you have the one I use:
>
>   LAYER
>     NAME "INLINE"
>     TYPE POINT
>     STATUS ON
>    CLASS
>        NAME "0"
>        STYLE
>          COLOR 255 0 0 # red
>          MAXSIZE 300 # default 50
>          SYMBOL 'phone'
>          SIZE 16
>        END #style
>    END #class
>  END #layer
>
>
>On Monday 19 July 2004 21:55, Ishrar Hussain wrote:
> > Dear Merlos,
> >
> > Thank you very much for your reply.
> >
> > Seeing your code, the question I now have is that, if
> > the "Inline" layer (as you've mentioned) is not
> > present in my map file, and I create a point layer
> > with ms_newLayerObj(), then do I need to draw() the
> > layer before referring its instance while drawing the
> > point?
> >
> > Looking forward to your reply.
> > Thanks again.
> >
> > Regards,
> > Ishrar
> >
> > --- Merlos <merlos at tsc.uvigo.es> wrote:
> > > Try this. It works for me.
> > >
> > > <?php
> > >
> > > $my_map= ms_newMapObj('data/test2.map');
> > >
> > > $pt = ms_newPointObj();
> > > $pt-> setXY(5,5);
> > > $img = $my_map->draw();
> > > //Inline is a POINT layer.
> > > $layer = $my_map->getLayerByName('INLINE');
> > > $pt->draw($my_map, $layer, $img, 0 ,'yuhuu');
> > >
> > >
> > > $url = $img->saveWebImage();
> > >
> > > echo "<img src=\"$url\" alt=\"Yuhuu!\" />";
> > >
> > > ?>
> > >
> > > Regards. Merlos.
> > >
> > > On Monday 19 July 2004 17:52, Ishrar Hussain wrote:
> > > > Please give me an example code showing how to use
> > > > PointObj class, i.e. ms_newPointObj(), to
> > >
> > > dynamically
> > >
> > > > draw a point over an already created instance of
> > > > MapObj, which have been instantiated with a static
> > > > .map file.
> > > >
> > > > Using Maplab, I have created my web mapping
> > > > application, which successfully published my shape
> > > > files in 4 layers. The map is now static. And over
> > > > this map, I need to draw with PHP/MapScript a new
> > > > layer that will hold one dynamic point, whose
> > > > coordinates I will be retrieving from a database
> > >
> > > using
> > >
> > > > PHP. (I am editing the drawmap.php file in the
> > >
> > > wrapper
> > >
> > > > folder for this.)
> > > >
> > > > Note that, I don't want to have this new layer
> > > > definition in my map file, which will make the
> > >
> > > layer
> > >
> > > > static. I also cannot use any database connection
> > >
> > > in
> > >
> > > > the mapfile (postgis or postgre or mygis). Thus,
> > > > PHP/MapScript's PointObj is my only choice.
> > > >
> > > > So, if possible, let me know whether PointObj can
> > >
> > > be
> > >
> > > > used to dynamically draw a point like this over a
> > > > MapObj, which is already instantiated with a map
> > >
> > > file
> > >
> > > > having 4 layer definitions.
> > > >
> > > > Any detailed example code showing how to use
> > >
> > > PointObj
> > >
> > > > will do.
> > > > Thank you.
> > > >
> > > > - Ishrar
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________
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> >
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> >
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> >
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> >
> > > --
> > > --
> > > http://www.merlos.biz
> >
> > __________________________________
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>
>--
>--
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