Reference · Framing, geometry and quiz tools
focusRegionFitfunction
What choosing one place computes: zoom in to fit it, whatever zoom the reader was already at. null for a code the
map does not hold, so a caller can tell "nothing to focus" from "fit the whole thing", which zoomToFit cannot.
Import it
import { focusRegionFit } from "@johnmorrisdotca/chizu";Definition
function focusRegionFit(map: Frameable, code: string | number | null): { zoom: MapZoom; centre: { x: number; y: number; }; } | nullParameters
| Name | Type | Description |
|---|---|---|
map | Frameable | The native map or map fields required by this signature; coordinates and region codes belong to its canvas. |
code | string | number | null | The native region or country code; null clears a region selection where accepted. |
Returns
{ zoom: MapZoom; centre: { x: number; y: number; }; } | null
The zoom step and centre fitting the chosen region, or null for a null or unknown region code.
Examples
import WORLD from "@johnmorrisdotca/chizu/world";
import { focusRegionFit } from "@johnmorrisdotca/chizu";
console.log(focusRegionFit(WORLD, "JP")?.zoom, focusRegionFit(WORLD, "XX"));
// 8 null8 nullWhat it prints (run when this page was built)