// Übung PG 2, Teil 3

// inhomogeneous list for Shape-Objects

// Author: Prinz / Kirch-Prinz / Weber

// Date: 26.05.05



#include <iostream>

using std::cout;

using std::endl;

using std::cin;

using std::left;



#include <typeinfo>

#include <list>  // class-Template list< T >

                 // T is type of list elements

#include "shape.h"



typedef std::list< Shape* > ShapePtrList;



void printShapeList( const ShapePtrList& spl );



int main()

{

   cout << "\n\t ***  Eine Liste geometrischer Figuren  ***\n"

        << endl;

   ShapePtrList myShapes;

   printShapeList( myShapes );



   cout << "\nElemente in die Liste einfuegen: " << endl;

   // append at end of list:

   myShapes.push_back( new Line( Point( 0, 0 ), Point( 2, 2 ) ) );

   myShapes.push_back( new Rectangle( Point( -1, -1 ), 2, 2 ) );



   // insert ellipse at front of list:

   myShapes.push_front( new Ellipse( Point( 0, 0 ), 3, 1) );



   Point vertices[] = { Point( 0, -3 ), Point( -3, 0 ), Point( 0, 3 ), Point( 3, 0 ) };

   Shape* ptr = new Polygon( vertices, 4 );  // a rombus

   // insert polygon as second element:

   myShapes.insert( ++myShapes.begin(), ptr );



   // a circle as last-but-one element:

   ShapePtrList::iterator pos =  // position of circle

     myShapes.insert( --myShapes.end(), new Circle( Point( 0, 0 ), 5 ) );

   ( *pos )->scale( 0.7 );  // make this element smaller



   cout << "Anzahl Elemente in der Liste: "

        << myShapes.size() << endl;

   printShapeList( myShapes );  // print list



   cout << "Figur vor dem Kreis loeschen ... " << endl;

   myShapes.erase( --pos );



   cout << "und die zweite Figur (das Polygon) verschieben: " << endl;

   pos = myShapes.begin();

   ptr = *( ++pos );  // second element = pointer to polygon

   ptr->move( 0, 3 ); // move upwards



   cout << "Die veraenderte Liste: " << endl;

   printShapeList( myShapes );  // print list



   return 0;

}



void printShapeList( const ShapePtrList& spl )

{

   if( spl.empty() ) {

     cout << "Die Liste ist leer!" << endl;

     return;

   }

   ShapePtrList::const_iterator pos = spl.begin();

   for( ; pos != spl.end(); ++pos ) {

      cout.width(20);

      cout << left << typeid( **pos ).name();

      cout << ( *pos )->toString() << endl;

   }

   cout << endl;

}