added library for polygons

ReallifeGamemode.Client/polygons/helpers.js

@@ -0,0 +1,53 @@
+const isPointInArea2D = (point, area) => {
+  let x = point[0], y = point[1];
+
+  let inside = false;
+
+  for (let i = 0, j = area.length - 1; i < area.length; j = i++) {
+      let xi = area[i][0], yi = area[i][1];
+      let xj = area[j][0], yj = area[j][1];
+
+      let intersect = ((yi > y) != (yj > y))
+          && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
+
+      if (intersect)
+        inside = !inside;
+  }
+
+  return inside;
+};
+
+const TWOPI = 6.283185307179586476925287;
+const EPSILON = 0.0000001;
+
+const modulus = (p) => Math.sqrt((p.x * p.x) + (p.y * p.y) + (p.z *p.z));
+
+const getAngleSumBetweenPositionAndVertices = (position, vertices) => {
+   let i;
+   let m1, m2;
+   let anglesum=0, costheta;
+   
+   for (i = 0; i < vertices.length; i++) {
+
+      const p1 = new mp.Vector3(vertices[i].x - position.x, vertices[i].y - position.y, vertices[i].z - position.z);
+      const p2 = new mp.Vector3(vertices[(i+1)%vertices.length].x - position.x, vertices[(i+1)%vertices.length].y - position.y, vertices[(i+1)%vertices.length].z - position.z);
+
+      m1 = modulus(p1);
+      m2 = modulus(p2);
+      
+      if (m1*m2 <= EPSILON)
+         return(TWOPI); 
+      else
+         costheta = (p1.x*p2.x + p1.y*p2.y + p1.z*p2.z) / (m1*m2);
+
+      anglesum += Math.acos(costheta);
+   }
+   return(anglesum);
+}
+
+const generateUniquePolygonId = () => {
+  const timestamp = Date.now();
+  return mp.polygons.pool.some(p => p.id === timestamp) ? generateUniquePolygonId() : timestamp;
+};
+
+export { isPointInArea2D, generateUniquePolygonId, getAngleSumBetweenPositionAndVertices };