lab4 start

Lab4/gcontext.cpp

@@ -0,0 +1,26 @@
+/* This is an abstract base class representing a generic graphics
+ * context.  Most implementation specifics will need to be provided by
+ * a concrete implementation.  See header file for specifics. */
+
+#define _USE_MATH_DEFINES	// for M_PI
+#include <cmath>	// for trig functions
+#include "gcontext.h"	
+
+/*
+ * Destructor - does nothing
+ */
+GraphicsContext::~GraphicsContext()
+{
+	// nothing to do
+	// here to insure subclasses handle destruction properly
+}
+
+//does nothing
+void GraphicsContext::drawLine(int x0, int y0, int x1, int y1){}
+void GraphicsContext::drawCircle(int x0, int y0, unsigned int radius){}
+
+
+void GraphicsContext::endLoop()
+{
+	run = false;
+}