diff --git a/NationalFlag/NationalFlag/Fill.h b/NationalFlag/NationalFlag/Fill.h
new file mode 100644
index 0000000..c40852f
--- /dev/null
+++ b/NationalFlag/NationalFlag/Fill.h
@@ -0,0 +1,25 @@
+#pragma once
+#include "Bucket.h"
+
+class CFill {
+public:
+	CFill();
+	virtual ~CFill();
+	void SetPoint(CPi2 *p, int);
+	void CreateBucket();
+	void CreateEdge();
+	void AddET(CAET *);
+	void ETOrder();
+	void Gouraud(CDC *);
+	void ClearMemory();
+	void DeleteAETChain(CAET *pAET);
+
+protected:
+	int PNum;
+	CPi2 *P;
+	CAET *pHeadE, *pCurrentE, *pEdge;
+	CBucket *pHeadB, *pCurrentB;
+
+public:
+	CRGB LinearDifferential(double y0, double y, double y1, CRGB c0, CRGB c1);
+};