Initial Commit. Working example. Needs refactored to store object position by CENTER to make SCALE easier to implement.

.gitignore

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+*~
+a.out
+

Makefile

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+a.out: main.cpp
+	clang++ --std=c++11 main.cpp -lncurses

main.cpp

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+#include <string>
+#include <curses.h>
+#include <unistd.h> // usleep
+
+struct Object {
+	int x1, y1; // top left
+	int x2, y2; // bottom right
+	double scale;
+
+	int Left()   const { return x1; }
+	int Right()  const { return x2; }
+	int Top()    const { return y1; }
+	int Bottom() const { return y2; }
+};
+
+bool InBounds(Object bounds, Object object);
+
+int main(int argc, char *argv[])
+{
+	WINDOW * mainwin;
+	// Initialize ncurses
+	if ( (mainwin = initscr()) == NULL ) {
+		fprintf(stderr, "Error initialising ncurses.\n");
+		exit(EXIT_FAILURE);
+	}
+
+	Object screen;
+	screen.x1 = 10;
+	screen.x2 = 31;
+	screen.y1 = 10;
+	screen.y2 = 15;
+	screen.scale = 1.0;
+
+	const Object initial_screen = screen;
+
+	Object object;
+	object.x1 = 1;
+	object.x2 = 5;
+	object.y1 = 4;
+	object.y2 = 8;
+	object.scale = 1.0;
+
+	const Object initial_object = object;
+
+	while(true)
+	{
+		screen = initial_screen;
+		object = initial_object;
+
+		bool covered_last_frame = false;
+
+		for(auto y = 0; y < 14; ++y)
+		{
+			for(auto x = 0; x < 40; ++x)
+			{
+				// DRAW
+				clear();
+				std::string scr(screen.Right() - screen.Left() + 1, '+');
+				for(auto row = screen.Top(); row <= screen.Bottom(); ++row)
+					mvaddstr(row, screen.Left(), scr.c_str());
+
+				std::string obj(object.Right() - object.Left() + 1, '*');
+				for(auto row = object.Top(); row <= object.Bottom(); ++row)
+					mvaddstr(row, object.Left(), obj.c_str());
+
+				bool covered = InBounds(screen, object);
+
+				mvaddstr(1, 1, covered ? "Covered: YES" : "Covered: NO");
+
+				refresh();
+
+				if(covered != covered_last_frame)
+					usleep(500000); // 1/2 sec
+				else
+					usleep(35000); // quick
+
+				covered_last_frame = covered;
+
+				++object.x1;
+				++object.x2;
+			}
+			++object.y1;
+			++object.y2;
+			object.x1 -= 40;
+			object.x2 -= 40;
+		}
+	}
+
+	// destroy ncurses
+	delwin(mainwin);
+	endwin();
+	refresh();
+
+	return 0;
+}
+
+bool InBounds(Object bounds, Object object)
+{
+	if(object.Right() < bounds.Left()
+	   || object.Left() > bounds.Right()
+	   || object.Bottom() < bounds.Top()
+	   || object.Top() > bounds.Bottom())
+		return false;
+	return true;
+}