#include    <stdio.h>
#include    <stdlib.h>
#include    "project.h"


int main (int argc, char *argv[]) {
	char	c;
	int	n,m;
	int	i,j;
	char	**image;
	int	dir;
	int	a;

	//defaults
	n = m = 400;
	dir = 2;
	i = j = 50;


	//get command line arguments
	// ./dragonplot n m dir i j
	GET_ARG(n,1) 	 //n*m image
	GET_ARG(m,2) 
	GET_ARG(dir,3)   //initial direction
	GET_ARG(i,4)	 //start position
	GET_ARG(j,5)

	//create n*m indexed image array
	image = (char **)malloc(m*sizeof(char *) + n*m*sizeof(char));
	image[0] = (char *)(image + m);
 	for (a = 1; a < m; a++) image[a] = image[a-1] + n;

	//starting point
	image[j][i] = 255;
	
	while ( TRUE ) {
		//draw a line segment
		for (a=0; a<DRAGON_LENGTH; a++) {
			switch(dir){
			case 0: i++;  break;
			case 1: j++;  break;
			case 2: i--;  break;
			default: j--; break;
			}
			if (((i>=0)&&(i<n))&&((j>=0)&&(j<m))) image[j][i] = 255;
			//fprintf(stderr,"(%i,%i)\n",i,j);
		}

		//read stdin until end of line reached
		if ((c = getchar() ) == '\n' )	break;

		dir = (dir + (c == A ? 1 : -1 ) +4) % 4;	//+4 is to stop it going -ve

	}

	// output image to stdout
	PGM_HEADER(n,m)
	for (j=0; j<m; j++) 
		for (i=0; i<n; i++) putchar(image[j][i]);
	

	free(image);

	return(EXIT_SUCCESS);
}