R: [mapserver-dev] Writing text to image after map rendering

[GMail]

Hi Tamas,

the second way is what I used to do before, when I got a map in BMP format. But now I’m using PNG, so I think there is a performance penalty loading the PNG into a .NET image object, drawing and then reconverting it again to PNG.

 

So (correct me if I’m wrong), I suppose the first method is better from a performance point of view because it avoids PNG->BMP->PNG. I tried it, but I’m probably missing something. This is what I do before the map.Draw():

 

            layerObj layer = new layerObj(userSesson.oGIS);

            layer.name = "COPYRIGHT_LAYER";

            layer.type = MS_LAYER_TYPE.MS_LAYER_POLYGON;

            layer.setMetaData("type", Convert.ToString((int)MS_LAYER_TYPE.MS_LAYER_ANNOTATION));

            layer.status = mapscript.MS_ON;  

 

            shapeObj polygon = new shapeObj((int)MS_SHAPE_TYPE.MS_SHAPE_POLYGON);

            lineObj polyLine = new lineObj(); 

            polyLine.add(new pointObj(12,42, 0, 0));

            polyLine.add(new pointObj(12,43,0,0));

            polyLine.add(new pointObj(13,43,0,0));

            polyLine.add(new pointObj(13,42,0,0));

            polyLine.add(new pointObj(12,42,0,0));

            polygon.add(polyLine);

 

            classObj aclass = new classObj(layer);

            aclass.name = "MyClass";

            aclass.setMetaData("name","MyClass");

            // Create a style object defining how to draw features

            styleObj lineStyle = new styleObj(aclass);

            lineStyle.color.setRGB(255,0,0);

           // lineStyle.

            layer.addFeature(polygon);

 

 

I should see a red colored rectangle, but I only see the other layers.

Have you got an example of how to do it?

 

 

Fabrizio

 

 

Da: Tamas Szekeres [mailto:szekerest at gmail.com] 
Inviato: giovedì 27 ottobre 2011 21:37
A: GMail
Cc: mapserver-dev at lists.osgeo.org
Oggetto: Re: [mapserver-dev] Writing text to image after map rendering

 

Fabrizio,

 

The most reasonable approach is to add a new annotation layer to the mapObj with the desired transform, opacity and postlabelcache setting.

 

Alternatively you could load the resulting byte array to a .NET Image object then use GDI+ to draw the text over the image.

 

Best regards,

 

Tamas

 

 

2011/10/26 GMail <itacasoft at gmail.com>

Hello everybody,
I'm using MapScript-C# to render PNG map images and send it to a Silverlight
client.
Is it possible to write some text (e.g.: copyright information) to the
imageObj before to send the image stream to the client? How?
Thanks

Fabrizio

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