MAP_ZOOM_LEVELSconstant

How far in the map is drawn, as steps rather than a free zoom. A free zoom would offer a hundred framings of which a few are useful: the steps are those, plus the whole map to come back to. Ten whole steps, 1× to 10×: the maps are vector outlines whose lines keep their width on the screen at any step, and at 5× a city prefecture, a ward or a country such as Luxembourg or Singapore was still a few pixels across. The first step is always 1× and the last the deepest, so code that reads MAP_ZOOM_LEVELS[0] and MAP_ZOOM_LEVELS.at(-1) for its buttons follows the ladder.

import { MAP_ZOOM_LEVELS } from "@johnmorrisdotca/chizu";

const MAP_ZOOM_LEVELS: readonly [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] as const

import { MAP_ZOOM_LEVELS } from "@johnmorrisdotca/chizu";

console.log(MAP_ZOOM_LEVELS.join(" "));
// 1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9 10