drawing circles and pentagons in C++

[qutecynosure]

I want to draw three circles within a pentagon in C++. I also want to give random movement to one of the circles within pentagon. Can anyone tell me the code alongwith the required header files for drawing this.

regards

[Ancient Dragon]

depends on the operating system. MS-Windows you might want to use a game engine such as DirectX or OpenGL (both are free).

[qutecynosure]

In fact I am trying to develop a program for my algorithm. Whenever, i try to draw circle using circle(x,y,r) function, my borland c++ compiler gives me error 'BGI graphics not supported'. Tell me how to fix this error?

Regards

[Ancient Dragon]

How to fix? Use a different compiler that supports BGI graphics. See this link

Or better yet, use win32 api graphics functions. It has a circle() function as well as several others which are similar to Borland's DOS BGI.

[qutecynosure]

which compiler would be the most suitable in this case?

[Ancient Dragon]

what version of borland compiler do you have? I use Microsoft VC++ 2010 Express which is free.

[qutecynosure]

I have borland C++ 5.02

[Ancient Dragon]

Use a different compiler and come into the 21st century. That compiler can not be used to access win32 api drawing functions.

[qutecynosure]

thanks! I Changed the compiler!!!

[damnigottajoin]

Info:
If using MSCVisual studio w/ win32 project...
Use the Ellipse function to draw a circle

Ex. Ellipse(hDC,100,100,200,200);

Parameters are: hDC, left, top, right, bottom -----------

For a multi-sided shape polygon like a Pentagon use the Polygon function, and the coordinate points for your shape are stored in an array and used by the function.

// Declare Array w/ shape coordinates
POINT Pt[7];
Pt[0].x = 20;
Pt[0].y = 50;
Pt[1].x = 180;
Pt[1].y = 50;

// Function Call to Draw Shape
Ex. Polygon(hDC, Pt, 2);

------------------------------- BELOW IS FUNCTION TO DRAW EQUILATERAL TRIANGLE

// DRAW EQUILATERAL TRIANGLE

//FUNCTION CALL EMAPLE: eqTriangle(hDC,200,200,300,200); 
void eqTriangle(HDC & hDC,double start_x, double start_y, double end_x, double end_y)
{
	double height;
	double side_length;
	double half_length;

	HPEN hPen1;                                                    // Declare Pen
	hPen1 = CreatePen(PS_SOLID,10,RGB(0,0,0));                     // Create Pen
	SelectObject(hDC,hPen1);                                       // Select Pen
	MoveToEx(hDC,start_x,start_y,NULL);                            // Move to First Point
	LineTo(hDC,end_x,end_y);                                       // Draw Bottom of eqTriangle - 

	side_length = end_x - start_x;                                 // Length of Bottom of eqTriangle
	half_length = side_length/2;                                   // Half of Bottom eqTriangle Length
	height = sqrt(pow(side_length,2) - pow(side_length/2,2));      // Height of eqTriangle using Pythagorean Theorem

	LineTo(hDC,start_x + half_length, start_y - height);           // Draw Right Side of eqTriangle
	LineTo(hDC, start_x, start_y);                                 // Draw Left Side of eqTriangle

}