Question

starting out with >>> C++ EARLY OBJECTS - Chapter 15 Programming Challenge #7

Write a program that creates two rectangular shapes and then animates them. The two shapes should start on opposite ends of the screen and then move toward each other. When they meet in the middle of the screen, each shape reverses courses and moves toward the edge of the screen. The two shapes keep oscillating and bouncing off of each other in the middle of the screen. The program terminates when the shapes meet each other in the middle for the tenth time.

Answer 1

Solution: #include <1 stream> #include <string> #include <vector> #include <Windows . h> usina namespace std; /Iglobal constant const HANDLE ut hand GetStdHandle (STD OUTPUT HANDLE) ; class rect Shape public: //set direction virtual void set dir (int rw, int cl) //get direction void getDirection (int &rw, int &cl) cl Cl; virtual void motion) 0; private:

int Rw, Cl; // Direction of motion class drawShape public rect Shape public: virtual V ld draw shape() = 0; //get position void getPosition (int &row, int &col) row row Position; //set position void setPosition (int row, int col) row Position - row; /set color void setColor (int col) color col; //get color int getcolor () return color;

virtual void motion ); private: int color; int row Position, col Position; class rectangle public drawShape public: virtual void draw shape () rectangle (int row Position, int col Position, int wid, int hgt); private: int wid, hgt; void drawShape: :motion () //motion direction int Rw, cl; int color saved - color; //с 1 r 0 erases the shape color 0

draw 3hape o //compute new position getDirection (Rw, Cl); row Position + Rw; c r c r saved; draw shape (); //Constructor rectangle :: rectangle (int r w P siti n , İnt。ol Position, lnt wid, int hgt) setColor (14); setPosition(row Position, col Position); this->wid = wid; this->hgt - hgt; draw shape (); //Draws a rectangle shape void rectangle: :draw shape ( int row Position, col Position; COORD posi

SetconsoleTextAttribute (out_hand, getcolor )) getPosition(row Position, col Position); pos.xcol_Position; pos.x-row Position ; for (int r = 0; r< hgt; r++) SetconsoleCursorPosition (out hand, pos); for ( int c-0; c < wid; c++) cout<< "* c utくくendl ; pos.Y++ SetconsoleTextAttribute (out_hand, 7); int main ) //creates two rectangles rectangle rect1 (5, 0, 10, 5); rectangle rect2 (5, 70, 10, 5); int meet 0 int dir1 =-1, dir2 1;

recti.draw shape (); rect2.draw_shape ); dirl- -dirl; dir2 -dir2; rect1.set dir (O , dirl); ect2.set dir (0, dir2) for ( int i = 0; i < 30; i++) Sleep (100); rect1.motion ); rect2.motion ); meett+; COORD pos pos . Y = 15; SetConsoleCursorPosition (out hand, pos); cout<<"Number of meetings at the middle: " << (meet+1)/2<<endl; while (meet < 19); return 0; Output:

Gluserstemp.spidom.0151documentslvisual studio 20101Projects 1212Debug11212.exe Nunber of neetings at the middle: 1

Code:

#include <iostream>

#include <string>

#include <vector>

#include <Windows.h>

using namespace std;

//global constant
const HANDLE out_hand = GetStdHandle(STD_OUTPUT_HANDLE);

class rect_Shape

{

public:
  
   //set direction
virtual void set_dir(int rw, int cl)

{

Rw = rw;

Cl = cl;

}
   //get direction
void getDirection(int &rw, int &cl)

{

rw = Rw;

cl = Cl;

}

virtual void motion() = 0;

private:

int Rw, Cl; // Direction of motion

};

class drawShape : public rect_Shape

{

public:

virtual void draw_shape() = 0;
     
   //get position
void getPosition(int &row, int &col)

{

row = row_Position;

col = col_Position;

}
   //set position
void setPosition(int row, int col)

{

row_Position = row;

col_Position = col;

}
   //set color
void setColor(int col)

{

color = col;

}
   //get color
int getColor()

{

return color;

}

virtual void motion();

private:

int color;

int row_Position, col_Position;

};

class rectangle : public drawShape

{

public:

virtual void draw_shape();

rectangle(int row_Position, int col_Position, int wid, int hgt);

private:

int wid, hgt;

};

void drawShape::motion()

{
   //motion direction

int Rw, Cl;

int color_saved = color;

   //color 0 erases the shape
color = 0;   

draw_shape();

//compute new position

getDirection(Rw, Cl);

row_Position += Rw;

col_Position += Cl;

color = color_saved;

draw_shape();

}

//Constructor

rectangle::rectangle(int row_Position, int col_Position, int wid, int hgt)

{

setColor(14);

setPosition(row_Position, col_Position);

this->wid = wid;

this->hgt = hgt;

draw_shape();

}

//Draws a rectangle shape

void rectangle::draw_shape()

{

int row_Position, col_Position;

COORD pos;

SetConsoleTextAttribute(out_hand, getColor());

getPosition(row_Position, col_Position);

pos.X = col_Position;

pos.Y = row_Position;

for(int r = 0; r < hgt; r++)

{

SetConsoleCursorPosition(out_hand, pos);

for( int c = 0; c < wid; c++)

cout<< "*";

cout<<endl;

pos.Y++;

}

SetConsoleTextAttribute(out_hand, 7);

}

int main()

{

//Creates two rectangles

rectangle rect1(5, 0, 10, 5);

rectangle rect2(5, 70, 10, 5);

int meet = 0;   

int dir1 = -1, dir2 = 1;

rect1.draw_shape();

rect2.draw_shape();

do

{

dir1 = -dir1; dir2 = -dir2;

rect1.set_dir(0, dir1);

rect2.set_dir(0, dir2);   

for( int i = 0; i < 30; i++)

{

Sleep(100);

rect1.motion();

rect2.motion();

}

meet++;

COORD pos;

pos.X = 5;

pos.Y = 15;

SetConsoleCursorPosition(out_hand, pos);

cout<<"Number of meetings at the middle: "

<<(meet+1)/2<<endl;

}while(meet < 19);

return 0;

}