add TypeScript support

index.d.ts

@@ -0,0 +1,42 @@
+declare type Point = number[];
+declare type Line = [Point, Point];
+declare type Polygon = Point[];
+
+interface GeometricStatic {
+    lineAngle(line: Line): number;
+    lineInterpolate(line: Line): (t: number) => Point;
+    lineLength(line: Line): number;
+    lineMidpoint(line: Line): Point;
+    pointRotate(point: Point, angle: number, origin?: Point): Point;
+    pointTranslate(point: Point, angle: number, distance: number): Point;
+    polygonArea(polygon: Polygon): number;
+    polygonBounds(polygon: Polygon): [Point, Point] | null;
+    polygonCentroid(polygon: Polygon): Point;
+    polygonHull(polygon: Polygon): Polygon;
+    polygonLength(polygon: Polygon): number;
+    polygonMean(polygon: Polygon): [number, number];
+    polygonRegular(sides = 3, area = 100, center?: Point): Polygon;
+    polygonRotate(polygon: Polygon, angle: number, origin?: Point): Polygon;
+    polygonScale(polygon: Polygon, scale: number, origin?: Point): Polygon;
+    polygonScaleX(polygon: Polygon, scale: number, origin?: Point): Polygon;
+    polygonScaleY(polygon: Polygon, scale: number, origin?: Point): Polygon;
+    polygonTranslate(polygon: Polygon, angle: number, distance: number): Polygon;
+    lineIntersectsLine(lineA: Line, lineB: Line): boolean;
+    lineIntersectsPolygon(line: Line, polygon: Polygon): boolean;
+    pointInPolygon(point: Point, polygon: Polygon): boolean;
+    pointOnPolygon(point: Point, polygon: Polygon): boolean;
+    pointLeftofLine(point: Point, line: Line): boolean;
+    pointRightofLine(point: Point, line: Line): boolean;
+    pointOnLine(point: Point, line: Line): boolean;
+    pointWithLine(point: Point, line: Line): boolean;
+    polygonInPolygon(polygonA: Polygon, polygonB: Polygon): boolean;
+    polygonIntersectsPolygon(polygonA: Polygon, polygonB: Polygon): boolean;
+    angleReflect(incidenceAngle: number, surfaceAngle: number): number;
+    angleToDegrees(angle: number): number;
+    angleToRadians(angle: number): number;
+}
+
+declare const exports: GeometricStatic;
+export = exports;
+
+export as namespace geometric;

src/points/pointRotate.js

@@ -18,4 +18,4 @@ export function pointRotate(point, angle, origin){
 function rotate(point, angle){
   // See: https://en.wikipedia.org/wiki/Cartesian_coordinate_system#Rotation
   return [(point[0] * Math.cos(angle)) - point[1] * Math.sin(angle), (point[0] * Math.sin(angle)) + point[1] * Math.cos(angle)];
-}
+}