functionality to compute subquad ids and corners

quad.cpp

@@ -85,4 +85,22 @@ namespace vb01{
 
 		meshBase = MeshData(faceVertPos, nullptr, nullptr, nullptr, 6, norm, vertices, indices, numTris);
 	}
+
+	//TODO improve functionality for GUI quads 
+	Vector2 Quad::getSubquadIds(int numVertDiv, int numHorDiv, Vector3 pos, Vector3 size){
+		const int numHorQuads = numVertDiv + 1, numVertQuads = numHorDiv + 1;
+		Vector2 subQuadSize = Vector2(size.x / numHorQuads, size.z / numVertQuads);
+
+		return Vector2(int((.5 * size.x + pos.x) / subQuadSize.x), int((.5 * size.z + pos.z) / subQuadSize.y));
+	}
+
+	Vector3 Quad::getSubquadCorner(int xId, int yId, int numVertDiv, int numHorDiv, bool top, bool right){
+		const int numHorQuads = numVertDiv + 1, numVertQuads = numHorDiv + 1;
+		int vertPosId = 6 * xId * numVertQuads + 6 * yId;
+
+		if(top && !right) return meshBase.positions[vertPosId];
+		else if(top && right) return meshBase.positions[vertPosId + 4];
+		else if(!top && !right) return meshBase.positions[vertPosId + 1];
+		else if(!top && right) return meshBase.positions[vertPosId + 3];
+	}
 }

quad.h

@@ -9,7 +9,12 @@ namespace vb01{
 		public:
 			Quad(Vector3, bool = true, int numVertDiv = 0, int numHorDiv = 0);
 			void setSize(Vector3);
+			Vector3 getSubquadCorner(int, int, int, int, bool, bool);
+			Vector2 getSubquadIds(int, int, Vector3, Vector3);
 			inline Vector3 getSize(){return size;}
+			inline Vector2 getSubquadSize(){return Vector2(size.x / (numHorDiv + 1), size.y / (numVertDiv + 1));}
+			inline int getNumHorSubquads(){return numHorDiv + 1;}
+			inline int getNumVertSubquads(){return numVertDiv + 1;}
 		private:
 			Vector3 size;
 			bool spatial;