///////////////////////////////////////////////////////////////////
//
//	graphics1.cpp
//
//	Started in Pascal by Jeff Ondich on 1/25/95
//	Last modified 1/17/00
//
//
//	1. Compile it, run it, and read all the functions to
//	see what they do.
//
//	2. Try changing the parameters passed to SayHello().  What
//	do g2_move_r() and g2_line_r() do?  Which is a more generally
//	useful function--SayHello(), or SayHelloAgain()?  Why?
//
///////////////////////////////////////////////////////////////////

#include <iostream>
#include <g2++.h>
#include <g2_X11++.h>

// Prototypes

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

// Defined constants

const int windowWidth = 500;
const int windowHeight  = 500;

int main()
{
	/////////////////////////////////////
	// Open the graphics window.
	/////////////////////////////////////

	int window = g2_open_X11( windowWidth, windowHeight );


	/////////////////////////////////////
	// Clear the window.
	/////////////////////////////////////

	g2_set_background( window, g2_ink(window,0,0,0) );


	/////////////////////////////////////
	// Draw.
	/////////////////////////////////////

	SayHello( window, 100, 400 );
	SayHelloAgain( window );
	DrawSomeCircles( window );


	/////////////////////////////////////
	// Clean up.
	/////////////////////////////////////

	cout << "Click in this window and hit return to quit." << endl;
	cin.get();

	g2_close( window );
	
	return( 0 );
}


void SayHello( int window, int startX, int startY )
{
	g2_pen( window, g2_ink(window,1,1,1) );
	g2_move( window, startX, startY );
	g2_line_r( window, 30, 80 );
	g2_line_r( window, -10, 20 );
	g2_line_r( window, 0, -100 );
	g2_line_r( window, 10, 30 );
	g2_line_r( window, 10, 0 );
	g2_line_r( window, 10, -30 );
	g2_line_r( window, 15, 0 );
	g2_line_r( window, 10, 30 );
	g2_line_r( window, 5, -20 );
	g2_move_r( window, -10, 40 );
	g2_line_r( window, 0, 2 );
}


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

	g2_pen( window, g2_ink(window,1,0,0) );
	g2_set_font_size( window, 24 );
	g2_string( window, 350, 400, greeting );
}


void DrawSomeCircles( int window )
{
	g2_pen( window, g2_ink(window,0,0,1) );
	g2_circle( window, 150, 250, 50 );
	g2_filled_circle( window, 350, 250, 50 );
}