/* 
 * First example: shapes
 * OOP and C++
 * Note how the main program calls to draw and area become cleaner
 *
 * RunStuff:: g++ THISFILE
 */

#include <stdio.h>

/*
 * Definition of class Rect
 */
class Rect { //*1 Class definitions
public: //*1
	int x, y, wid, ht; //*1
	void draw(); //*1
	float area(); //*1
};

/*
 * Definition of class Circle
 */
class Circle { //*1
public: //*1
	int x, y, rad; //*1
	void draw(); //*1
	float area(); //*1
};

int main () {
	/*
	 * Data definitions
	 */
	Rect *r1, *r2; //*2 Declare and instantiate objects
	Circle *c1; //*2
	r1 = new Rect(); //*2
	r2 = new Rect(); //*2
	c1 = new Circle; //*2

	/*
	 * Set the locations of the 3 objects
	 */
	r1->x = 10; r1->y = 10; //*3 Set the data
	r1->wid = 50; r1->ht = 50; //*3

	r2->x = 80; r2->y = 10; //*3
	r2->wid = 10; r2->ht = 100; //*3

	c1->x = 35; c1->y = 90; //*3
	c1->rad = 10; //*3

	/*
	 * "Draw" them
	 */
	r1->draw(); //*4 Call the methods
	r2->draw(); //*4
	c1->draw(); //*4

	/*
	 * Compute and print total area
	 */
	printf ("Total area = %f\n", r1->area() + r2->area() + c1->area()); //*4

	return 0;
}

/*
 * Methods for class Rect
 */

void Rect::draw () { //*5 Procedure definitions
	printf ("Drawing rectangle at %d, %d, %d, %d\n", x, y, wid, ht); //*5
}

float Rect::area () { //*5
	return (float) (wid * ht);
}

/*
 * Methods for class Circle
 */

void Circle::draw () { //*5
	printf ("Drawing circle at %d, %d, radius = %d\n", x, y, rad);
}

float Circle::area () { //*5
	return (float) (rad * rad * 3.14159);
}