///////////////////////////////////////////////////////////////////
//
//	graphics1.cpp
//
//	Started in Pascal by Jeff Ondich on 1/25/95
//	Last modified 5/19/98
//
//
//	1. Compile it, run it, and read all the procedures to
//	   see what they do.
//
//	2. Try changing the parameters passed to SayHello().  What
//	   do rmoveto() and rlineto() do?  Which is a more generally
//	   useful function--SayHello(), or SayHelloAgain()?  Why?
//
///////////////////////////////////////////////////////////////////

#include	<iostream.h>
#include	<gpc-graphics++.h>


// Constants

const int windowWidth = 600;
const int windowHeight = 600;
const int windowBottom = 100;
const int windowLeft = 100;


// Prototypes

void StartGraphics( void );
void SayHello( int startX, int startY );
void SayHelloAgain( void );
void DrawSomeCircles( void );


int main( void )
{
	StartGraphics();
	SayHello( 100, 490 );
	SayHelloAgain();
	DrawSomeCircles();
	cin.ignore();
	
	return( 0 );
}


void SayHello( int startX, int startY )
{
	setrgbcolor( 1.0, 1.0, 1.0 );
	moveto( startX, startY );
	rlineto( 30, 80 );
	rlineto( -10, 20 );
	rlineto( 0, -100 );
	rlineto( 10, 30 );
	rlineto( 10, 0 );
	rlineto( 10, -30 );
	rlineto( 15, 0 );
	rlineto( 10, 30 );
	rlineto( 5, -20 );
	rmoveto( -10, 40 );
	rlineto( 0, 2 );
	flushgraphics();
}


void SayHelloAgain( void )
{
	char	greeting[20] = "Howdy";

	setrgbcolor( 1, 0, 0 );
	setfont( 1, 36 );
	showtextXY( 350, 400, greeting );
	setrgbcolor( 0, 1, 0 );
	moveto( 380, 350 );
	showtext( greeting );
	flushgraphics();
}


void DrawSomeCircles( void )
{
	setrgbcolor( 0, 0, 1 );
	circle( 150, 250, 50 );
	circlefilled( 350, 250, 50 );
	flushgraphics();
}



///////////////////////////////////////////////////////////////////
//	StartGraphics initializes the graphics package
//	and opens a black window for drawing.
///////////////////////////////////////////////////////////////////

void StartGraphics( void )
{
	// Call initializegraphics only once during the program,
	// before you do any other graphics
   
 	initializegraphics();


	// Open a window and flood it with a black background.

	createwindow( windowLeft, windowBottom,
					windowLeft + windowWidth, windowBottom + windowHeight );
	setrgbcolor( 0.0, 0.0, 0.0 );
	flood(); 
	flushgraphics();
}