Parliamentarch-TS : Westminster SVG

Tools to generate Westminster-styled SVG parliamentary diagrams.

This package generates SVG DOM nodes (SVGSVGElement objects), which can be serialized into SVG image files.

It requires the document global constant in order to generate DOM nodes, either by being executed in a browser, or using stand-ins like jsdom in Node.js.

import { getSVGFromAttribution } from "@parliamentarch/westminster-svg";
import * as fs from "fs";

const attribution = {
    speak: [{nSeats:2}],
    opposition: [{color:"red",nSeats:51},{color:"orange",nSeats:49}],
    government: [{color:"blue", nSeats:61},{color:"rebeccapurple",nSeats:59}],
    cross: [{color:"green",nSeats:10}, {color:"limegreen",nSeats:8}, {color:"yellow",nSeats:3}],
};
const outerHTML = getSVGFromAttribution(attribution, { packed:false }).outerHTML;
fs.writeFileSync("./westSample.svg", outerHTML);

Module contents

These are found in the @parliamentarch/westminster-svg module.

getSVGFromAttribution(attribution, { roundingRadius?, spacingFactor?, ...geometryOptions }?): SVGSVGElement

This function creates an SVG element containing the diagram.

• attribution: all the various attribution formats won't be listed here (see @parliamentarch/westminster-core/utils). However, the object for the party, which will inform how the seat will be represented, must be a SeatData (see below).
• roundingRadius?: number: how much the seat corners get rounded. At 0, a full square, at .5, a full circle.
• spacingFactor?: number: the relative spacing between neighboring seats of the same area. This is multiplied by the size of a square to get the actual spacing between two neighboring seats. Defaults to 0.1.
• geometryOptions: all the options taken by the functions of @parliamentarch/westminster-core/geometry can be passed as well.

SeatData = StandaloneSeatData | ClassSeatData

This is a type (alias/union) for the object standing in for the parties, and describing how the seats of that party should be displayed.

ParliamentArch can create SVG diagrams in two fashions:

• either it uses <g> elements to apply group-level styles to the seats, skipping CSS altogether, which allows creating standalone SVG files. You would use StandaloneSeatData.
• or it only applies CSS classes to the seats, leaving the user with the task of defining the CSS rules for those classes in the embedding HTML document. You would use ClassSeatData.

ClassSeatData

• class?: string| readonly string[]: CSS class or classes to apply to all seats of this group.

StandaloneSeatData

• id?: string: An optional id to apply to the <g> element containing all seats of this group.
• data?: string: Some human-readable data about this group of seats.
• color: string: The color with which to fill the seat square, as a CSS color.
• borderSize?: number: The size of the border around the seat square, defaults to 0.
• borderColor?: string: The color of the border, defaults to black.
• roundingRadius?: number: Overrides the same parameter passed to the function.