topic Re: how the USProjection function works in Tools

how the USProjection function works

sshrabah43 — Wed, 16 Nov 2016 10:34:02 GMT

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.

Re: how the USProjection function works

alzverev — Thu, 24 Nov 2016 10:50:29 GMT

Hi Guedrez,

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

Thanks

Re: how the USProjection function works

Deniz AYDIN — Tue, 28 Feb 2017 07:13:06 GMT

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.

Re: how the USProjection function works

Deniz AYDIN — Thu, 02 Mar 2017 06:48:52 GMT

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?

Re: how the USProjection function works

Deniz AYDIN — Tue, 14 Mar 2017 07:38:22 GMT

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.