[Chameleon] Drawing a Point

[Ken-ichi]

Thanks!  I tried abandoning the PointObj->draw() method and using yours 
and now it works fine (I also had to set TRANSFORM to TRUE for the 
layer, but I should have known that since I made the same mistake months 
ago.  Oi).  I used the geomath pix2georef() method as well, which worked 
fine.

Thanks again!

-Ken-ichi

Ken Sanderson wrote:

>I just let Chameleon do the drawing, as my widget triggers the submit of
>the form. Here is my ParseURL blurb that I am using:
>
>        if ($szCmd == "GetPoint"){
>            /** get a list of the layer names */	
>            $aszLayerNames =
>$this->moMapNavigator->oSession->oMap->getAllLayerNames();
>            
>            /** check to see if the 'your points' layer already exists.
>If so just use that layer,
>                if not then create it */
>            if(in_array("Your Points", $aszLayerNames)){
>              $poLayer =
>$this->moMapNavigator->oSession->oMap->getLayerByName("Your Points");
>              $poClass = $poLayer->getClass(0);
>              $poStyle = $poClass->getStyle(0);
>            } else {
>              /** creating the new layer which will live as long as the
>current session */
>              $poLayer = ms_newLayerObj($this->moMapObject->oMap);
>              $poLayer->set("name", "Your Points");
>              $poLayer->set("status", MS_ON);
>              $poLayer->set("type", MS_LAYER_POINT);
>              $poLayer->set("labelcache", MS_OFF);
>              $poClass = ms_newClassObj($poLayer);
>              $poClass->set("name", "dynamic point class");
>              $poStyle = ms_newStyleObj($poClass);
>              $poStyle->set("symbolname","star");
>              $poStyle->set("size", 15);
>              $poStyle->color->setRGB(255, 0, 0);
>              $poStyle->outlinecolor->setRGB(0,0,0);
>            }
>            
>            $pt = ms_newPointObj();
>            $ln = ms_newLineObj();
>            $shp = ms_newShapeObj(MS_SHAPE_POINT);  
>            
>            $theX = "";
>            $theX = $this->getVar("CursorPos_X");
>            $theY = "";
>            $theY = $this->getVar("CursorPos_Y");
>                        
>            $pt->setXY($theX,$theY); 
>            $ln->add($pt); 
>            $shp->add($ln);  
>            $poLayer->addFeature($shp);
>        }
>
>Ken
>
>-----Original Message-----
>From: chameleon-bounces at lists.maptools.org
>[mailto:chameleon-bounces at lists.maptools.org] On Behalf Of Ken-ichi
>Sent: August 12, 2004 11:14 AM
>To: Jason Fournier
>Cc: chameleon at lists.maptools.org
>Subject: Re: [Chameleon] Drawing a Point
>
>
>Thanks for the tip on the Locate widget.  Unfortunately, as far as I can
>
>tell, that works by creating a temporary shapefile, adding a point to 
>the shapefile, and then setting the shapefile as the data source for the
>
>new layer.  I want to do something much simpler, which is simply drawing
>
>a point directly to the map with the pointObj's draw() method.  I've 
>done this with MapScript before, basically with this same code.
>
>Does anyone know if there's a better way to get at the ImageObj than 
>$map->draw() in Chameleon?  I feel like that's where my problem might
>be.
>
>-Ken-ichi
>
>Jason Fournier wrote:
>
>  
>
>>If you take a look at the Locate widget it contains a significant 
>>amount of code related
>>to adding a point on the map.  If you're able to swim your way through
>>    
>>
>it you may find 
>  
>
>>some useful tidbits.  
>>
>>Perhaps someone else on the list knows offhand?
>>
>>If this fails then I'd suggest mailing the MapServer list as there are 
>>many PHP/MapScript
>>(and generally more MapScript) developers who may have input.
>>
>>As for debugging ... what kind of information were you looking for?  
>>Are you looking for
>>information about Chameleon errors?  This can be reported by the
>>    
>>
>ErrorReport widget.  Or 
>  
>
>>are you interested more in logging the application?
>>
>>Thanks,
>>Jason
>>
>>
>>
>>
>>On Aug 11, Ken-ichi <kueda at wso.williams.edu> wrote:
>> 
>>
>>    
>>
>>>Hi again.  To learn about widget development, I'm trying to make a 
>>>copy
>>>of the ZoomIn widget draw a point on the map instead of zooming in.
>>>      
>>>
>To 
>  
>
>>>that end, I've altered the ParseURL method so that the if(
>>>      
>>>
>$szInputType 
>  
>
>>>== "POINT" ) clause looks like this:
>>>
>>>           if ($szInputType == "POINT")
>>>           {
>>>               $aPixPos = explode(",", $szInputCoords);
>>>              
>>>               //draw a point with MapScript
>>>               $map = $this->moMapNavigator->oSession->oMap;
>>>
>>>               $daLayer = ms_newLayerObj($map);
>>>               $daLayer->set("type", MS_LAYER_POINT);
>>>               $daLayer->set("transform", MS_FALSE);
>>>               $daLayer->set("status", MS_ON);
>>>                     
>>>               $class = ms_newClassObj($daLayer);
>>>               $class->set("name", "Temp Class");
>>>               $style = ms_newStyleObj($class);
>>>               $style->color->setRGB(255,0,0);
>>>               $style->set("symbolname", "circle");
>>>               $style->set("size", 10);
>>>
>>>               $my_point = ms_newPointObj();
>>>               $my_point->setXY($aPixPos[0],$aPixPos[1]);
>>>                    
>>>
>>>               $image = $map->draw();
>>>                    
>>>               $temp = $my_point->draw( $map, $daLayer, $image, 0,
>>>"Temp Point" );
>>>
>>>               if( $temp == MS_SUCCESS ) $daLayer->set("name",
>>>      
>>>
>$temp);
>  
>
>>>           }
>>>
>>>This successfully adds a layer to the legend with the correct styling,
>>>but fails to draw the point on the map.  Note that the last line does 
>>>result in setting the name of the new layer to MS_SUCCESS (haven't 
>>>figured out how to use any of Chameleon's debugging capabilities, if 
>>>such things exist), so the draw() method thinks it's working.
>>>
>>>Can anyone tell me what I'm doing wrong?  Many thanks.
>>>
>>>-Ken-ichi
>>>_______________________________________________
>>>Chameleon mailing list
>>>Chameleon at lists.maptools.org
>>><a
>>>   
>>>
>>>      
>>>
>>href='http://lists.maptools.org/mailman/listinfo/chameleon'>http://list
>>s.maptools.org/mail
>>man/listinfo/chameleon</a>
>> 
>>
>>_______________________________________________
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>> 
>>
>>    
>>
>
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