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Chikyu Earth地球

A line-drawn globe of the world's countries that turns at the Earth's own rate, with an optional realistic Earth from space and markers for any place.

Chikyu is the Japanese word 地球 for the Earth. About the name

Contents

Reference · Markers on the globe

groupCellfunction

The size, in degrees, of the ground's cells that crowded places are gathered in, for an Earth drawn radius CSS pixels across: about PLACE_GROUP_PX on the screen, rounded up to a power of two so the groups change at only a few zooms and stay put while the Earth turns. 0 (gather none) when a cell would be under 1/64 of a degree, about 1.7 km.

Import it

import { groupCell } from "@johnmorrisdotca/chikyu-earth/markers";

Definition

function groupCell(radius: number): number

Parameters

NameTypeDescription
radiusnumber

The Earth's radius on the screen, in CSS pixels.

Returns

number

The cell's size in degrees, from 1/64 to 32, or 0.

Examples

import { groupCell } from "@johnmorrisdotca/chikyu-earth/markers";

console.log(groupCell(200), groupCell(1_000_000)); // 8 0
8 0

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/chikyu-earth 0.51.1.