iwmlib/lib/pixi/maps/projections/projection.js

/**
 * A projection determines how a geographical card has to
 * be interpreted to map coordinate to pixels.
 *
 * Most used transformation is the mercator projection,
 * which projects a sphere on a cylinder.
 *
 * @abstract
 */

export default class Projection {
    /**
     * Transforms a coordinate to a normalized position on the map.
     *
     * @param {*} coords
     * @memberof Projection
     */
    forward(coords) {
        console.error('You must override the forward function in ' + this.name + '.')
    }

    /**
     * Transforms a normalized point on the map to a coordinate.
     *
     * @param {*} point
     * @memberof Projection
     */
    backward(point) {
        console.error('You must override the backward function in ' + this.name + '.')
    }

    toString() {
        return 'Projection (abstract)'
    }

    get name() {
        return this.toString()
    }

    get maxViewport() {
        return { min: new PIXI.Point(0, 0), max: new PIXI.Point(1, 1) }
    }
}