Re: [Openev-discuss] Support for display of Icons?

[Frank W. <war...@po...>]

Morgenthaler, David G wrote:
> Does OpenEV have support for display of icons? I need to be able to display small graphics (e.g., 30x30 pixels) that don't change size when the view is zoomed.
> 
> Thanks,
> 
> David G. Morgenthaler

David,

The answer is yes, OpenEV does display of fixed sized raster icons.
I won't claim it is a particularly simple example, but this is the chunk
of Python from the render test script that places some raster icons as point
features.


###############################################################################
#   Test of raster symbol.

     def raster_symbol( self ):
         self.set_step_name( 'Raster Symbol Test' )
         self.set_text( 'A red symbol (the busy indicator from thet toolbar)\n'
                        +'should be shown.  When zooming in or out it should\n'
                        +'remain the same size on screen.\n'
                        +''
                        +'NOTE: This symbols should really be green but it\n'
                        +'seems that currently the color attribute of\n'
                        +'SYMBOL directives for raster symbols is ignored\n'
                        +'\n'
                        +'\n'
                        +'' )

         shapes = gview.GvShapes()
         gview.undo_register( shapes)
         layer = gview.GvShapesLayer( shapes )
         layer.set_name( 'test' )

         if os.name == "nt":
             sym_file = gview.home_dir + '\\pics\\busy.xpm'
             sym_file2 = gview.home_dir + '\\pics\\idle.xpm'
             sym_name = '\\three_idle'
         else:
             sym_file = gview.home_dir + '/pics/busy.xpm'
             sym_file2 = gview.home_dir + '/pics/idle.xpm'
             sym_name = '/three_idle'


         # Unoffset icon
         shape = gview.GvShape( type = gview.GVSHAPE_POINT )
         shape.set_node( 20, 50, node=0 )
         shape.set_property('_gv_ogrfs',
                            'SYMBOL(c:#00FF00,id:"'+sym_file+'")' )
         shapes.append( shape )

         # Pixel Offset
         shape = gview.GvShape( type = gview.GVSHAPE_POINT )
         shape.set_node( 20, 50, node=0 )
         shape.set_property('_gv_ogrfs',
                            'SYMBOL(c:#00FF00,dx:30px,dy:-10px,id:"'+sym_file+'")' )
         shapes.append( shape )

         # Geo Offset
         shape = gview.GvShape( type = gview.GVSHAPE_POINT )
         shape.set_node( 20, 50, node=0 )
         shape.set_property('_gv_ogrfs',
                            'SYMBOL(c:#00FF00,dx:30g,dy:-30g,id:"'+sym_file+'")' )
         shapes.append( shape )

         # Inject a vector icon symbol that consists of three raster symbols,
         # but do it on the vector layer.

         sm = layer.get_symbol_manager( 1 )

         shape = gview.GvShape( type = gview.GVSHAPE_POINT )
         shape.set_node( 0.0, 0, node=0 )
         shape.set_property('_gv_ogrfs',
                            'SYMBOL(dy:-10px,dx:-40px,id:"' + sym_file2 + '");' + \
                            'SYMBOL(id:"' + sym_file2 + '");' + \
                            'SYMBOL(dy:10px,dx:40px,id:"' + sym_file2 + '")' )

         sm.inject_vector_symbol( sym_name, shape )

         # Place the "3" idle symbol.

         shape = gview.GvShape( type = gview.GVSHAPE_POINT )
         shape.set_node( 60, 50, node=0 )
         shape.set_property('_gv_ogrfs',
                            'SYMBOL(c:#00FF00,id:"'+sym_name+'")' )
         shapes.append( shape )

         # Add line for context.
         shape = gview.GvShape( type = gview.GVSHAPE_LINE )
         shape.set_node( 10, 10, node=0 )
         shape.set_node( 80, 10, node=1 )
         shape.set_node( 80, 90, node=2 )
         shape.set_node( 50, 80, node=3 )
         shape.set_node( 10, 90, node=4 )
         shapes.append( shape )

         self.view.add_layer( layer )
         self.view.set_active_layer( layer )

         self.view.fit_extents( 0, 0, 100, 100 )


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