点类基础函数

GMath.cpp

@@ -1096,3 +1096,39 @@ float dist(const GPoint3 & q, const GLine & l)
 	GVector3 p = proj(u, l.v);
 	return norm(u - p);
 }
+
+GPlane::GPlane(const GVector3 & _n, const GPoint3 & _p)
+{
+	n = _n;
+	d = -n * _p;
+}
+
+GPlane::GPlane(const GPoint3 & p1, const GPoint3 & p2, const GPoint3 & p3)
+{
+	n = (p2 - p1) ^ (p3 - p1);
+	d = -n * p1; //是平面上的一点点乘法线再取负号
+}
+
+GPlane::GPlane(const float & a, const float & b, const float & c, const float & d)
+{
+	n = GVector3(a, b, c);
+	this->d = d;
+}
+
+GPlane::GPlane(const GPlane & copy)
+{
+	n = copy.n;
+	d = copy.d;
+}
+
+GPlane& GPlane::operator=(const GPlane & rhs)
+{
+	n = rhs.n;
+	d = rhs.d;
+	return *this;
+}
+
+GVector3 GPlane::GetNormal() const
+{
+	return n;
+}

GMath.h

@@ -21,6 +21,7 @@ using namespace std;
 class GVector3;
 class GVector;
 class GMatrix;
+class GPlane;
 typedef GVector3 GPoint3;
 
 class GVector3 {
@@ -226,3 +227,18 @@ public:
 	bool IsOnLine(const GPoint3& q);
 	friend float dist(const GPoint3& q, const GLine& l);
 };
+
+class GPlane {
+private:
+	//ax+by+cz+d=0 a b c 其实就是法线，d是平面上的一点点乘法线再取负号
+	GVector3 n;
+	float d;
+public:
+	GPlane(const GVector3& _n = GVector3(0.0f, 0.0f, 0.0f), const GPoint3& _p = GVector3(0.0f, 0.0f, 0.0f));
+	GPlane(const GPoint3& p1, const GPoint3& p2, const GPoint3& p3);
+	GPlane(const float& a, const float& b, const float&c, const float& d);
+	GPlane(const GPlane& copy);
+
+	GPlane& operator =(const GPlane& rhs);
+	GVector3 GetNormal() const;
+};

main.cpp

@@ -2,15 +2,11 @@
 
 int main() {
 
-	GLine l(GPoint3(0.0f, 0.0f, 0.0f), GVector3(1.0f, 0.0f, 0.0f));
-	GPoint3 q(0.0f, 0.0f, 1.0f);
+	GPlane PI1(GVector3(0.0f, 0.0f, 1.0f), GPoint3(0.0f, 0.0f, 0.0f));
+	GPlane PI2(GPoint3(1.0,0.0f,0.0f), GPoint3(0.0, 1.0f, 0.0f), GPoint3(0.0, 0.0f, 1.0f));
 
-	float d = dist(q, l);
+	GPlane PI = PI1;
+	cout << PI.GetNormal() << endl;
 
-	cout << d << endl;
-
-	bool b = l.IsOnLine(GPoint3(0.0f, 0.0f, 0.0f));
-	bool b2 = l.IsOnLine(GPoint3(0.5f, 0.0f, 0.0f));
-	bool b3 = l.IsOnLine(GPoint3(0.5f, 0.5f, 0.0f));
 	return 0;
 }