/* * Copyright 2011 Steven Gribble * * This file is the solution to an exercise problem posed during * one of the UW CSE 333 lectures (333exercises). * * 333exercises is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * 333exercises is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with 333exercises. If not, see . */ // Lecture 15 exercise 1 #include // for std::pair #include // for std::string #include // for std::ostream #ifndef _LEC15_EX1_SHAPE_H_ #define _LEC15_EX1_SHAPE_H_ const double PI = 3.141592653589793238462643383279502884; // A "Shape" is an abstract class representing some kind of // two-dimensional shape. class Shape { public: Shape() { } // Make the destructor virtual; this is good hygiene, since it // guarantees that the full class hierarchy below Shape has virtual // destructors. virtual ~Shape() { } // Return the centroid of the shape. A centroid is a pair, where // .first() is the x-coordinate and .second is the y-coordinate. virtual std::pair Centroid() const = 0; // Return the area of the shape. virtual double Area() const = 0; // Move the shape by adding "delta" to the shape. virtual void Move(const std::pair &delta) = 0; // Return a string with some pretty-printed shape details. virtual std::string Print() const = 0; }; std::ostream &operator<<(std::ostream &out, const std::pair &p); #endif // _LEC15_EX1_SHAPE_H_