how the USProjection function works

[sshrabah43]

Hi all,

I've  defined FRMapLayout a new layout, which has the SVG of the map of France and it works (i.e., correctly displayed). However, when I set the coordinates of  my nodes (each node correspond to a city for example Paris) they are not positioned correctly. After digging a little bit I found that the positioning is done by the USProjection function wich convert the latitude & longitude coordinates  to X & Y coordinates on the SVG. Unfortunately, I couldn't understand in order to rewrite an FRProjection function.

Can someone explain the principals

Thx in advanced.

[alzverev]

Hi Guedrez,

Is that possible to share the code that you did, so that we could help you?

Thanks

[Deniz AYDIN]

Hi Aleksei,

I have a similar problem. I am trying to create new topology layout but unable to understand how the USProjection works or correctly set node's position.

Here's my code :

http://codepen.io/deniza/pen/bqVVvJ

I just rename the USMap Topology related variables and fuınctions.

[Deniz AYDIN]

Hi,

I managed to change projection. It seems USProjection use Albert's USA Projection.  I used d3 geo projection library for using Turkey Layout. I used mercator projection method which seems fine.

    var NXprojection = d3.geoMercator().scale(2800).center([35.25,38.8]);

I just embedded this into next.js, is there any method to register new layout without changing the original code?

[Deniz AYDIN]

from the discussion  D3 Geomap Integration?

created separate file and registered it,

    topo.registerLayout('TURKEYMap', new nx.graphic.Topology.TURKEYMapLayout())

http://codepen.io/deniza/pen/bqVVvJ?editors=0010

Projection method should be changed or adjusted.