inbetween vector operations

src/datatypes.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cmath>
 #include <math.h>
 
 // 2D Vectors
@@ -14,7 +15,19 @@ class Vec2D{
 		T y = 0;
 		T dist(Vec2D* v) { return sqrt(pow((v->x - x), 2) + pow((v->y - y), 2));};
 		T length() { return sqrt(pow(x, 2) + pow(y, 2));};
-		
+
+		T angle(Vec2D &v){
+			T angle = atan2(v.y, v.x) - atan2(y,x);
+			if(angle > M_PI) angle -= M_PI_2;
+			if(angle < -M_PI) angle += M_PI_2;
+			return angle;
+			//return acos(dot(v));
+		};
+
+		T dot(Vec2D &v){
+			return (x*v.x) + (y*v.y);
+		};
+
 		Vec2D& norm() { return *this * (1.0/length());};
 
 		Vec2D& operator=(const Vec2D& vec){
@@ -64,3 +77,21 @@ struct Color{
     int g;
     int b;
 };
+
+/*template <typename T>*/
+/*bool contains(T X, T Y) {*/
+/*    for (unsigned int i=0;i<Coords.size()-2;i+=2)*/
+/*    {*/
+/*        if (((Y-Coords[i+1])*(Coords[i+2]-Coords[i]) - (X-Coords[i])*(Coords[i+3]-Coords[i+1]))<0)*/
+/*        {*/
+/*            return (false);*/
+/*        }*/
+/*    }*/
+/*    //The last test is special*/
+/*    unsigned int j = Coords.size();*/
+/*    if (((Y-Coords[j-1])*(Coords[0]-Coords[j-2]) - (X-Coords[j-2])*(Coords[1]-Coords[j-1]))<0)*/
+/*    {*/
+/*        return (false);*/
+/*    }*/
+/*    return (true);*/
+/*}*/