@ue-too/border / index / orthoProjection

関数: orthoProjection()

orthoProjection(interestPoint, origin): object

定義: projection.ts:129

Projects a geographic coordinate to orthographic projection.

パラメータ

interestPoint

GeoCoord

The geographic coordinate to project

origin

GeoCoord

The center point of the hemisphere to view

戻り値

object

Object with clipped flag and projected coordinate

clipped

clipped: boolean

coord

coord: Point

Remarks

The orthographic projection shows Earth as it would appear from space, displaying one hemisphere at a time. It's useful for globe-like visualizations.

Points on the back hemisphere (not visible from the origin viewpoint) are marked as clipped.

The projection uses Earth's mean radius of 6,371,000 meters.

例

const origin = { latitude: 45.0, longitude: 0.0 }; // View centered on France
const coord = { latitude: 51.5, longitude: -0.1 }; // London

const result = orthoProjection(coord, origin);
if (!result.clipped) {
  console.log('London is visible at:', result.coord);
} else {
  console.log('London is on the back of the globe');
}