[Mapserver-users] drawing lines with mapscript

[Jeff Hoffmann]

Eric Bridger wrote:

> On Tue, 2004-03-30 at 09:56, Jeff Hoffmann wrote:
> 
>>Eric Bridger wrote:
>>
>>>On Mon, 2004-03-29 at 16:24, Jeff Hoffmann wrote:
>>>
>>>
>>>>I'm trying to create lines programmatically & draw them using mapscript, 
>>>>but I just can't seem to get any output.  It doesn't throw any errors, 
>>>>but I don't see any output, either.   
>>>>$layer = $map->getLayerByName('line_layer');
>>>>$layer->{status} = 1;
>>>>$class = $layer->getClass(0);
>>>>$class->setText($layer,"LINE");
>>>>my $shape = new mapscript::shapeObj($mapscript::MS_SHAPE_LINE);
>>>>$shape->add($line);
>>>
>>>
>>>Just a guess, but you could try $shape->setBounds() here.
>>>
>>>
>>>
>>>>$shape->draw($map, $layer, $img);
>>
>>That didn't change anything.  Does anybody at least know if this looks 
>>like it should be working?  Are there any examples of code that does 
>>this sort of thing?
> 
> 
> This should work. I had never used $shape->draw() so I modified a test
> script I had and it worked fine. I could not get $shape->{text} = "XX"
> to work.  You haven't shown your $line creation. Perhaps your
> coordinates are off.

Thanks for trying to help me through this.  I'm sure that the line has 
points that fall in the map I'm drawing.  I've hard-coded one line in 
there that should draw a line from corner to corner, but still nothing 
shows up.  $shape->draw(...) returns 0, but I don't know if that means 
"error" or "no error", the documentation just says it returns an integer.

----------------------------------

$layer = $map->getLayerByName('line_layer');
$layer->{status} = 1;
$class = $layer->getClass(0);
my $linePoint1 = new mapscript::pointObj();
$linePoint1->{x} = 272048; $linePoint1->{y} = 199772;
my $linePoint2 = new mapscript::pointObj();
$linePoint2->{x} = 272450; $linePoint2->{y} = 200074;
my $line = new mapscript::lineObj();
$line->add($linePoint1);
$line->add($linePoint2);
$class->setText($layer,"LINE");
my $shape = new mapscript::shapeObj($mapscript::MS_SHAPE_LINE);
$shape->add($line);
$shape->draw($map, $layer, $img);

----------------------------------

LAYER
   NAME "line_layer"
   STATUS ON
   PROJECTION
     "init=epsg:26958"
   END
   TYPE LINE
   CLASS
     LABEL
       ANGLE AUTO
       FONT arial
       TYPE TRUETYPE
       POSITION UC
       SIZE 7
       COLOR 0 0 0
     END
     COLOR 0 0 0
     SIZE 10
   END
END

-- 

Jeff Hoffmann
PropertyKey.com