colorize-transit-graph

colorize-transit-graph

Add “random” line colors to a given transit graph, e.g. generated using osm-transit-graph.

Installation

npm install -g colorize-transit-graph

Usage

The library will add color attributes to all lines / line groups that don't yet have color information. Existing colors will be conserved.

The output graph could then be drawn by using svg-transit-map.

CLI

Usage:
    cat graph.json | colorize-transit-graph > colorized-graph.json

Where graph.json containts a graph object with three attributes:

{
    nodes: [ // list of all nodes
        {
            id: "900000042101", // required
            metadata: {
                x: 537.029, // x-coordinate in any metric, required
                y: 673.576 // y-coordinate in any metric, required, see also the --invert-y option
            }
        }
        // …
    ],
    edges: [ // list of all edges
        {
            // the direction of the edge will be ignored, source and target are therefore interchangeable
            source: "900000120025", // node id, required
            target: "900000120008", // node id, required
            metadata: {
                lines :["U5","U6"] // list of line ids, required. please note that parallel lines must be modeled as one edge with two metadata.lines entries
            }
        }
        // …
    ],
    lines: [ // additional information for lines. if lines are not found in this list, default colour / group will be applied
        {
            id: 'U6', // line id, required
            color: '#456', // line colour, optional. existing information will be conserved
            group: 'U6' // line group id, optional. lines with the same group id will be merged info one for sections where they run in parallel
        }
        // …
    ]
}

As a library

The module can be used as a JS library:

const colorizeTransitGraph = require('colorize-transit-graph')
const graph = require('./graph.json') // your transit graph

const colorized = colorizeTransitGraph(graph)

Example

Graphs drawn using svg-transit-map.

    cat example/berlin-input.json | colorize-transit-graph > example/berlin-output.json
    cat example/berlin-output.json | svg-transit-map > example/berlin-output.svg

Input

Output

Contributing

If you found a bug or want to propose a feature, feel free to visit the issues page.