FM / geometry

/opt/canhelp/node_modules/leaflet/src/geometry/

/opt/canhelp/node_modules/leaflet/src/geometry

Name	Size	Mode	Actions
Bounds.js	6197	0644	edit dl rm
index.js	306	0644	edit dl rm
LineUtil.js	8784	0644	edit dl rm
Point.js	6142	0644	edit dl rm
PolyUtil.js	4079	0644	edit dl rm
Transformation.js	2487	0644	edit dl rm

Edit: /opt/canhelp/node_modules/leaflet/src/geometry/Transformation.js (2487B)

import {Point} from './Point';
import * as Util from '../core/Util';

/*
 * @class Transformation
 * @aka L.Transformation
 *
 * Represents an affine transformation: a set of coefficients `a`, `b`, `c`, `d`
 * for transforming a point of a form `(x, y)` into `(a*x + b, c*y + d)` and doing
 * the reverse. Used by Leaflet in its projections code.
 *
 * @example
 *
 * ```js
 * var transformation = L.transformation(2, 5, -1, 10),
 * 	p = L.point(1, 2),
 * 	p2 = transformation.transform(p), //  L.point(7, 8)
 * 	p3 = transformation.untransform(p2); //  L.point(1, 2)
 * ```
 */

// factory new L.Transformation(a: Number, b: Number, c: Number, d: Number)
// Creates a `Transformation` object with the given coefficients.
export function Transformation(a, b, c, d) {
	if (Util.isArray(a)) {
		// use array properties
		this._a = a[0];
		this._b = a[1];
		this._c = a[2];
		this._d = a[3];
		return;
	}
	this._a = a;
	this._b = b;
	this._c = c;
	this._d = d;
}

Transformation.prototype = {
	// @method transform(point: Point, scale?: Number): Point
	// Returns a transformed point, optionally multiplied by the given scale.
	// Only accepts actual `L.Point` instances, not arrays.
	transform: function (point, scale) { // (Point, Number) -> Point
		return this._transform(point.clone(), scale);
	},

// destructive transform (faster)
	_transform: function (point, scale) {
		scale = scale || 1;
		point.x = scale * (this._a * point.x + this._b);
		point.y = scale * (this._c * point.y + this._d);
		return point;
	},

// @method untransform(point: Point, scale?: Number): Point
	// Returns the reverse transformation of the given point, optionally divided
	// by the given scale. Only accepts actual `L.Point` instances, not arrays.
	untransform: function (point, scale) {
		scale = scale || 1;
		return new Point(
		        (point.x / scale - this._b) / this._a,
		        (point.y / scale - this._d) / this._c);
	}
};

// factory L.transformation(a: Number, b: Number, c: Number, d: Number)

// @factory L.transformation(a: Number, b: Number, c: Number, d: Number)
// Instantiates a Transformation object with the given coefficients.

// @alternative
// @factory L.transformation(coefficients: Array): Transformation
// Expects an coefficients array of the form
// `[a: Number, b: Number, c: Number, d: Number]`.

export function toTransformation(a, b, c, d) {
	return new Transformation(a, b, c, d);
}

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