How to draw squares using C++?

Question

I want to draw a big white square with a small black square in the center and then get each pixel value in array form. Can I draw it using C++? Or, I should import the picture from another file and then get each pixel value of its pixel. But, again how can I do that?

Thank you for your help...

Answer 1

C++ does not provide graphics capability as a part of the language's standard library. If you're completely lost in this regard, then I'd advise you to choose another, higher-level language.

Answer 2

Hi ming



the answer sis easy.. review the below code



* Object Orientation in C++ */



#include



/* abstract interface declaration */



class Shape

{

public:

virtual void Draw () = 0;

virtual void MoveTo (int newx, int newy) = 0;

virtual void RMoveTo (int dx, int dy) = 0;

};



/* Class Rectangle */



class Rectangle : public Shape

{

public:

Rectangle (int x, int y, int w, int h);

virtual void Draw ();

virtual void MoveTo (int newx, int newy);

virtual void RMoveTo (int dx, int dy);

virtual void SetWidth (int newWidth);

virtual void SetHeight (int newHeight);



private:

int x, y;

int width;

int height;

};



void Rectangle::Draw ()

{

cout << "Drawing a Rectangle at (" << x << "," << y

<< "), width " << width << ", height " << height << "\n";

};



void Rectangle::MoveTo (int newx, int newy)

{

x = newx;

y = newy;

}



void Rectangle::RMoveTo (int dx, int dy)

{

x += dx;

y += dy;

}



void Rectangle::SetWidth (int newWidth)

{

width = newWidth;

}



void Rectangle::SetHeight (int newHeight)

{

height = newHeight;

}



Rectangle::Rectangle (int initx, int inity, int initw, int inith)

{

x = initx;

y = inity;

width = initw;

height = inith;

}





/* Class Circle */



class Circle : public Shape

{

public:

Circle (int initx, int inity, int initr);

virtual void Draw ();

virtual void MoveTo (int newx, int newy);

virtual void RMoveTo (int dx, int dy);

virtual void SetRadius (int newRadius);



private:

int x, y;

int radius;

};



void Circle::Draw ()

{

cout << "Drawing a Circle at (" << x << "," << y

<< "), radius " << radius << "\n";

}



void Circle::MoveTo (int newx, int newy)

{

x = newx;

y = newy;

}



void Circle::RMoveTo (int dx, int dy)

{

x += dx;

y += dy;

}



void Circle::SetRadius (int newRadius)

{

radius = newRadius;

}



Circle::Circle (int initx, int inity, int initr)

{

x = initx;

y = inity;

radius = initr;

}





/* ===================================================================

* DoSomethingWithShape is a fuction that takes a polymorphic shape

* and manipulates it according to its interface.

*/



void DoSomethingWithShape (Shape * s)

{

s->Draw ();

s->RMoveTo (100, 100);

s->Draw ();

}





/* ===================================================================

* Main Program

*/



int main ()

{



/* using shapes polymorphically */



Shape * shapes[2];

shapes[0] = new Rectangle (10, 20, 5, 6);

shapes[1] = new Circle (15, 25, 8);



for (int i=0; i<2; ++i) {

DoSomethingWithShape (shapes[i]);

}



/* access a rectangle specific function */



Rectangle * rect = new Rectangle (0, 0, 15, 15);

rect->SetWidth (30);

rect->Draw ();



return 0;

}

Answer 3

cat