public void lineaBres(int x0,int y0, int x1, int y1, Graphics g){
           
         
        int dx = Math.abs(x1 - x0);
        int dy = Math.abs(y1 - y0);
        int sx = x0 < x1 ? 1 : -1;
        int sy = y0 < y1 ? 1 : -1;
        int err = dx - dy;

        while (true) {
            g.drawRect(x0,y0,1,1);
            if (x0 == x1 && y0 == y1) break;
            int e2 = 2 * err;
            if (e2 > -dy) {
                err -= dy;
                x0 += sx;
            }
            if (e2 < dx) {
                err += dx;
                y0 += sy;
            }
        }
    }