Projection package cartesian-projection

Class: Cartesian

Creates a projection of a rectangular coordinate area into world coordinates.
The area size in pixels is always 2*2.

Name

Cartesian

Param

An array of two points -
coordinates of the lower left and upper right corners of the rectangular coordinate area.

Param

false]] An array of signs of map looping by x and y.

Example

mappable.ready(async () => {
    const {MMaps} = mappable;
    // Calculate the size of all tiles at the maximum zoom.
    const worldSize = Math.pow(2, MAX_ZOOM) * 256;
    const PIC_WIDTH = 2526;
    const PIC_HEIGHT = 1642;

    const {Cartesian} = await mappable.import('@mappable-world/mappable-cartesian-projection@0.0.1');
    // We set as a projection Cartesian. With this calculation, the center of the image will lie in the coordinates [0, 0].
    const projection = new Cartesian([
        [-PIC_WIDTH / 2, PIC_HEIGHT / 2 - worldSize],
        [worldSize - PIC_WIDTH / 2, PIC_HEIGHT / 2],
    ]);

    const map = new MMaps({
        //...,
        projection: projection
    });
});

Implements

Constructors

constructor

new Cartesian(bounds, cycled?)

Parameters
Name Type
bounds [LngLat, LngLat]
cycled? [boolean, boolean]

Properties

type

readonly type: "cartesian"
Implementation of

Projection.type

Methods

fromWorldCoordinates

fromWorldCoordinates(point): LngLat

Parameters
Name Type
point WorldCoordinates
Returns

LngLat

Implementation of

Projection.fromWorldCoordinates

toWorldCoordinates

toWorldCoordinates(point): WorldCoordinates

Parameters
Name Type
point LngLat
Returns

WorldCoordinates

Implementation of

Projection.toWorldCoordinates

Interface: GenericProjection<TSource>

Type parameters

Name
TSource

Properties

type

optional readonly type: string

Projection identity type. It may be:

  • EPSG-code (e.g. EPSG:3857)
  • any other string to identify (e.g. 'cartesian')

Methods

fromWorldCoordinates

fromWorldCoordinates(coordinates): TSource

Parameters
Name Type
coordinates WorldCoordinates
Returns

TSource

toWorldCoordinates

toWorldCoordinates(point): WorldCoordinates

Parameters
Name Type
point TSource
Returns

WorldCoordinates

Interface: Vec2

Properties

x

x: number

y

y: number

Interface: WorldCoordinates

Coordinates in [-1 ... +1].
Left bottom is (-1; -1).
Right top is (+1; +1).
Center is (0; 0).

Properties

type

optional readonly type: "world"

x

x: number
Inherited from

Vec2.x

y

y: number
Inherited from

Vec2.y

z

optional z: number

Module: <internal>

Type Aliases

LngLat

LngLat: [lon: number, lat: number, alt?: number]

Tuple with geodesic coordinates in longitude latitude order.
GeoJSON also uses this order https://tools.ietf.org/html/rfc7946#appendix-A.1

Projection

Projection: GenericProjection<LngLat>