import fr.jussieu.script.Deug;

public class images_gris{
    public static void dessine_gris(short[][] image) {
	short n=image[0][0];
	Deug.setGray(n);
	for(int i = 0; i < image.length; i++)
	    for(int j = 0; j < image[i].length; j++) {
		if (image[i][j] != n){
		    n = image[i][j];
		    Deug.setGray(n);
		}
		Deug.drawPoint(i, j);
	    }
    }
    public static short[][] colourExpand(boolean[][] im){
	short[][] im_gris = new short [im.length][im[0].length];
	for(int i = 0; i < im_gris.length; i++)
	    for(int j = 0; j < im_gris[i].length; j++) {
		if (im[i][j])
		    im_gris[i][j]=0;
		else
		    im_gris[i][j]=255;
	    }
	return im_gris;
    }

    public static short[][] antiAlias(short[][] im){
	short[][] im_flou = new short [im.length][im[0].length];
	for(int i = 0; i < im_flou.length-1; i++){ //pour les bords on recopie juste
	    im_flou[i][0] = im[i][0];
	    im_flou[i][im[0].length-1] = im[i][im[0].length-1];
	}
	for(int j = 0; j < im_flou[0].length-1; j++){ //pour les bords on recopie juste
	    im_flou[0][j] = im[0][j];
	    im_flou[im.length-1][j] = im[im.length-1][j];
	}
	for(int i = 1; i < im_flou.length-1; i++)
	    for(int j = 1; j < im_flou[i].length-1; j++) {
		double moyenne_voisin =
		    im[i-1][j-1] + im[i-1][j] + im[i-1][j+1] +
		    im[i][j-1]   +             im[i][j+1] +
		    im[i+1][j-1] + im[i+1][j] + im[i+1][j+1];
		moyenne_voisin = moyenne_voisin/8;
		im_flou[i][j] = (short)((3/4.)*im[i][j] + (1/4.)*moyenne_voisin);
	    }
	return im_flou;
    }
    public static void main(String[] args){
	int longueur = 200, hauteur = 200;
	Deug.startDrawings(longueur, hauteur);
	boolean[][] img_croix = images_NB.croix(longueur, hauteur);
	boolean[][] img_croix_diag = images_NB.croixDiagonale(longueur);
	boolean[][] img_superpose = images_NB.superpose(img_croix, img_croix_diag);
	short[][] img_superpose_gris_flou = antiAlias(antiAlias(antiAlias(colourExpand(img_superpose))));
	
	dessine_gris(img_superpose_gris_flou);
    }
}