first commit

src/math/Vector2D.h

@@ -0,0 +1,37 @@
+#pragma once
+
+class CVector2D
+{
+public:
+	float x, y;
+	CVector2D(void) {}
+	CVector2D(float x, float y) : x(x), y(y) {}
+	CVector2D(const CVector &v) : x(v.x), y(v.y) {}
+	float Magnitude(void) const { return sqrt(x*x + y*y); }
+	float MagnitudeSqr(void) const { return x*x + y*y; }
+
+	void Normalise(void){
+		float sq = MagnitudeSqr();
+		if(sq > 0.0f){
+			float invsqrt = 1.0f/sqrt(sq);
+			x *= invsqrt;
+			y *= invsqrt;
+		}else
+			x = 0.0f;
+	}
+	CVector2D operator-(const CVector2D &rhs) const {
+		return CVector2D(x-rhs.x, y-rhs.y);
+	}
+	CVector2D operator+(const CVector2D &rhs) const {
+		return CVector2D(x+rhs.x, y+rhs.y);
+	}
+	CVector2D operator*(float t) const {
+		return CVector2D(x*t, y*t);
+	}
+};
+
+inline float
+CrossProduct2D(const CVector2D &v1, const CVector2D &v2)
+{
+	return v1.x*v2.y - v1.y*v2.x;
+}