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/* 
 * This function draws a very crude "robot" face on the PC video 
 * screen, using block characters on an 80x25 matrix. In addition 
 * to entertaining children, it shows some simple techniques for 
 * drawing lines, boxes and circles, which could be applied to 
 * higher resolution graphics modes. 
 * 
 * Copyright 1990 Dave Dunfield 
 * All rights reserved. 
 */ 
 
#include \mc\stdio.h		/* Standard I/O definitions */ 
#include \mc\video.h		/* Video	I/O definitions */ 
 
#define	PCHR	0xDB 
 
/* 
 * Main program, draw the face 
 */ 
main() 
{ 
	int i; 
 
	vopen(); 
	vcursor_off(); 
	box(1, 0, 77, 24); 
	for(i=1; i < 5; ++i) { 
		circle(17, 8, i); 
		circle(60, 8, i); } 
	circle(17, 8, 6); 
	circle(60, 8, 6); 
	line(38, 9, 42, 13); 
	line(38, 9, 34, 13); 
	line(35, 13, 41, 13); 
	box(24, 18, 53, 21); 
	vgetc(); 
	vcursor_line(); 
	vclscr(); 
} 
 
/* 
 * Draw a line from point (x1, y1) to (x2, y2) 
 */ 
line(x1, y1, x2, y2) 
	int x1, y1, x2, y2; 
{ 
	int i, w, h; 
 
	/* If 'X' is greater, increment through 'X' coordinate */ 
	if((w = abs(x1 - x2)) >= (h = abs(y1 - y2))) { 
		if(x1 > x2) { 
			i = x1; 
			x1 = x2; 
			x2 = i; 
			i = y1; 
			y1 = y2; 
			y2 = i; } 
		h = y2 - y1; 
 
		for(i=0; i < w; ++i) { 
			vgotoxy(x1+i, y1+((i*h) / w)); 
			vputc(PCHR); } } 
	/* If 'Y' is greater, increment through 'Y' coordinate */ 
	else { 
		if(y1 > y2) { 
			i = x1; 
			x1 = x2; 
			x2 = i; 
			i = y1; 
			y1 = y2; 
			y2 = i; } 
		w = x2 - x1; 
		for(i=0; i < h; ++i) { 
			vgotoxy(x1+((i*w)/h), y1+i); 
			vputc(PCHR); } } 
 
	vgotoxy(x2, y2); 
	vputc(PCHR); 
} 
 
/* 
 * Draw a box with opposite corners (x1, y1) to (x2, y2) 
 */ 
box(x1, y1, x2, y2) 
	int x1, y1, x2, y2; 
{ 
	line(x1, y1, x2, y1); 
	line(x1, y1, x1, y2); 
	line(x2, y1, x2, y2); 
	line(x1, y2, x2, y2); 
} 
 
/* 
 * Draw a circle about point (x, y) of radus (r) 
 */ 
circle(x, y, r) 
	int x, y, r; 
{ 
	int i, j, k, rs, lj; 
 
	rs = (lj = r)*r; 
	for(i=0; i <= r; ++i) { 
		j = k = sqrt(rs - (i*i)); 
		do { 
			vgotoxy(x+i, y+j); vputc(PCHR); 
			vgotoxy(x+i, y-j); vputc(PCHR); 
			vgotoxy(x-i, y+j); vputc(PCHR); 
			vgotoxy(x-i, y-j); vputc(PCHR); } 
		while(++j < lj); 
		lj = k; } 
}