how to buffer only one side ?

[Srirama Bhamidipati]

hi,

i would like to know if it is possible to buffer to only one side of a line segment (edge) in a graph ? Or may be something to define as an offset ? I want to show quantity moved on an edge ( that is bidirectional  ) and that quantity differs by direction.

regards,

Srirama

[Srirama Bhamidipati]

Something to this effect.

[Patrick Taillandier]

Hi,

There is no simple solution for that. You can try to use a buffer + offset.

I just modified the road traffic tutorial model 1 with that (and by removing the opengl type from the display):

species road  {

aspect base {

draw (shape + 3.0) at_location (location + 1.5) color: #gray;

draw shape color: #yellow ;

}

}

And I get the attached result (not perfect, but not so bad ;) )

Cheers,

Patrick

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[Srirama Bhamidipati]

Smart :) 

Seeking some confirmations here ;)

Q1. The location units will be meters I guess ?

Q2. And if I give negative units to the location, the buffer will move to the opposite side of line ?

Q3. Does the location (+/-) then depend on the from and to node of the edge ?  I mean lets say, (from viewers perspective) an edge has fromNode (south) and toNode (north) then offset I assume will go to the left. And if the same edge has fromNode (north) and toNode (south) then the offset will go right ?

Q4 What is this new # tag ? (twitter effect) ? :D

regards,

Srirama

[Patrick Taillandier]

Q1: yep, all distance in GAMA is in meters

Q2: I think so

Q3: hum.... not sure. After, you can module the sign of the buffer by a given expression. 

bool to_south <- shape.points[0].y < shape.points[length(shape.points) - 1].y; 

draw (shape + 3.0) at_location (location + (to_south ? 1.5 : - 1.5)) color: #gray;

Q4: in GAMA 1.6, we used the symbol "°" to define units. However, this symbol is pretty hard to find on US keyboard, so now you can either use ° or # to define units (for instance: #m #km #s #h #km/#h...). Another new nice feature is that you can use # (or °) to define color: #red #blue, #yellow ...

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