lab4 start

Lab4/drawbase.h

@@ -0,0 +1,21 @@
+#ifndef DRAWBASE_H
+#define DRAWBASE_H
+
+// forward reference
+class GraphicsContext;
+
+class DrawingBase
+{
+	public:
+		// prevent warnings
+		virtual ~DrawingBase(){}
+		virtual void paint(GraphicsContext* gc){}
+		virtual void keyDown(GraphicsContext* gc, unsigned int keycode){}
+		virtual void keyUp(GraphicsContext* gc, unsigned int keycode){}
+		virtual void mouseButtonDown(GraphicsContext* gc, 
+								unsigned int button, int x, int y){}
+		virtual void mouseButtonUp(GraphicsContext* gc,
+								unsigned int button, int x, int y){}
+		virtual void mouseMove(GraphicsContext* gc, int x, int y){}
+};
+#endif