/****************************************************************************
** COPYRIGHT (C):    1997 Cay S. Horstmann. All Rights Reserved.
** PROJECT:          Practical OO Development with C++ and Java
** FILE:             shapes18.cpp
** PURPOSE:          test MI shapes in chapter 18
** VERSION           1.0
** PROGRAMMERS:      Cay Horstmann (CSH)
** RELEASE DATE:     3-15-97 (CSH)
** UPDATE HISTORY:
****************************************************************************/

/* Project:
   GUI Application
   Add files
      shapes18.cpp
      \PracticalOOBook\cpplib\graphics.cpp
   Additional include directory:
      \PracticalOOBook\cpplib
*/

#include "setup.h"
#include "graphics.h"
#include "math.h"

class Point;

class Shape
{
public:
   Shape();
   Shape(Color);

   virtual void plot(Graphics& g) const;
   virtual ~Shape() {}
private:
   Color _color;
};

/*-------------------------------------------------------------*/

class Point : public Shape
{
public:
   Point(int xx =0, int yy =0, Color c = Color::black);

   virtual void plot(Graphics& gc) const;

   int x() const;
   int y() const;

#ifdef PRACTICALOO_COMPILER_UNREASONABLY_INSISTS_ON_COMPARISON_OPERATORS_FOR_VECTORS
   bool operator<(const Point& b) const { return _x < b._x || _x == b._x && _y < b._y; }
   bool operator==(const Point& b) const { return _x == b._x && _y == b._y; }
#endif 

private:
   int _x;
   int _y;
};

/*-------------------------------------------------------------*/

class Polygon : public Shape
{
public:
   Polygon() {}
   Polygon(int, Color);

   Point corner(int) const;
   void set_corner(int, Point);

   virtual void plot(Graphics& gc) const;

private:
#ifndef PRACTICALOO_MUST_USE_ALLOCATOR
   vector<Point> _corners;
#else
	vector<Point, allocator<Point> > _corners;
#endif
};

/*-------------------------------------------------------------*/

class Text : public Shape, public string
{
public:
   Text(Point, string, Color);

   void plot(Graphics& gc) const;
private:
   Point _start;
};

/*-------------------------------------------------------------*/

class TrafficSign : public Text, public Polygon
{
public:
   TrafficSign(Point c, int nvert, string t);
   void plot(Graphics& gc) const;
};

/*-------------------------------------------------------------*/

void paint(Graphics& g)
{  
#ifndef PRACTICALOO_MUST_USE_ALLOCATOR
   vector<Shape*> a;
#else
	vector<Shape*, allocator<Shape*> > a;
#endif

   a.push_back(new Point(100, 100, Color::blue));
   a.push_back(new Text(Point(150, 150), "Hello", Color::green));
   TrafficSign* sign 
		= new TrafficSign(Point(200, 200), 8, "Stop");
   *sign += "!"; // it is a string :-)
   a.push_back((Polygon*)sign); // but it isn't a shape :-(
   for (int j = 0; j < a.size(); j++)
      a[j]->plot(g);
}

/*-------------------------------------------------------------*/

Shape::Shape() : _color(Color::blue) {}

/*.............................................................*/

Shape::Shape(Color c) : _color(c) {}

/*.............................................................*/

void Shape::plot(Graphics& g) const
{  g.setColor(_color);
}

/*-------------------------------------------------------------------------*/

Point::Point(int xx, int yy, Color c)
:	Shape(c), _x(xx), _y(yy)
{}

/*.............................................................*/

void Point::plot(Graphics& g) const
{  Shape::plot(g);
   g.drawOval(_x - 2, _y - 2, 5, 5);
}

/*.............................................................*/

inline int Point::x() const
{  return _x;
}

/*.............................................................*/

inline int Point::y() const
{  return _y;
}

/*-------------------------------------------------------------------------*/

Text::Text(Point p, string t, Color c)
:  string(t),
   Shape(c),
   _start(p)
{}

/*.............................................................*/

void Text::plot(Graphics& g) const
{  Shape::plot(g);
	FontMetrics fm = g.getFontMetrics();
	
   int xw = fm.stringWidth(*this);
   g.drawString(*this, _start.x() - xw / 2, _start.y());
}

/*-------------------------------------------------------------------------*/

Polygon::Polygon(int n, Color c)
:  Shape(c), _corners(n)
{}

/*.............................................................*/

Point Polygon::corner(int i) const
{  return _corners[i];
}

/*.............................................................*/

void Polygon::set_corner(int i , Point p)
{  _corners[i] = p;
}

/*.............................................................*/

void Polygon::plot(Graphics& g) const
{  Shape::plot(g);
   for (int i = 0; i < _corners.size(); i++)
   {  int j = (i + 1) % _corners.size();
      Point p = _corners[i];
      Point q = _corners[j];
      g.drawLine(p.x(), p.y(), q.x(), q.y());
   }
}

/*-------------------------------------------------------------------------*/

TrafficSign::TrafficSign(Point p, int nvert, string t)
:  Text(p, t, Color::red),
	Polygon(nvert, Color::black)
{  // nvert calls to set_corner
   const int RAD = 50;
   for (int i = 0; i < nvert; i++)
   {  double angle = (1 + 2 * i) * M_PI / nvert;
      set_corner(i, Point(p.x() + RAD * cos(angle), 
			p.y() + RAD * sin(angle)));
   }
}

/*.............................................................*/

void TrafficSign::plot( Graphics& gc ) const
/* PURPOSE:    plot this shape
   RECEIVES:   gc - graphics context
*/
{  Polygon::plot(gc);
   Text::plot(gc);
}