[Mapserver-users] mapscript: convert lat/lon to map coords? Simple Q

[Eric Bridger]

Your problem is the TRANSFORM FALSE line in your line layer.
Remove it.  It means mapserver will not transform your coordinates to
pixel values, thus treating them as acutal pixel values.

On Fri, 2003-08-22 at 06:15, poff wrote:
> Hello all,
> 
> This is a simple question which is puzzling me.
> 
> When I draw a lat/lon value on a map, I just call setXY() and it draws in 
> the right place.
> 
> However it seems when I want to draw a line it's using map co-ordinates - 
> even if I set an extent.
> 
> It's probably something really stupid I'm doing so I hope you can help me 
> out!
> 
> The mapfile is simple, and the script below does output a line, but not 
> with lat/lon co-ords but absolute co-ords for the image.
> 
> ...
> # start layer lines
> 
> LAYER
> 	NAME 'lines'
> 	TRANSFORM FALSE
> 	TYPE LINE
> 	STATUS DEFAULT
> 
> 	CLASS
> 		SYMBOL 'marker'
> 		SIZE 2
> 		COLOR 255 0 0
> 	END
> 
> END
> 
> # end layer lines
> ...
> 
> Oh yes, is there are quicker (or smaller number of lines way) of adding 
> lines to a map?
> 
> Thank you in advance for any help,
> 
> <?php
> ...
> $mapObj = ms_newMapObj($_SERVER["DOCUMENT_ROOT"]."/maps/plot.map");
> 
> $layerObj = $mapObj->getLayerByName("lines");
> $layerObj->set("status", 1);
> 
> $minx=-125;
> $miny=10;
> $maxx=105;
> $maxy=50;
> 
> $mapObj->setextent($minx,$miny,
>                      $maxx,$maxy);
> 
> $imgObj=$mapObj->draw();
> 
> $shpObj = ms_newShapeObj(MS_SHAPE_LINE);
> 
> $pointObj1 = ms_newPointObj();
> $pointObj1->setXY(-122.247,47.5881); // Seattle
> 
> $pointObj2 = ms_newPointObj();
> $pointObj2->setXY(5.73333,45.65); // Paris
> 
> $pointObj3 = ms_newPointObj();
> $pointObj3->setXY(104.917,11.55); // Phnom Pehn
> 
> $lineObj = ms_newLineObj();
> 
> $lineObj->add($pointObj1);
> $lineObj->add($pointObj2);
> $lineObj->add($pointObj3);
> 
> $shpObj->add($lineObj);
> 
> $shpObj->draw($mapObj, $layerObj, $imgObj, 0, "foo");
> 
> $image_url=$imgObj->saveWebImage(MS_PNG,1,1,0);
> ...
> ?>
> 
> Any other criticisms are warmly welcomed!
> -- 
> poff at sixbit.org
> SDF Public Access UNIX System - http://sdf.lonestar.org
> 
> Please do not carbon copy replies to me
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