int Player_x = 0;
int Player_y = 0;
int counter = 10;
int direction = 0;
int dleft = 10;
int dright = 20;
int dup = 30;
int ddown = 40;

int field_x =  (int)random(0,10);
int field_y =  (int)random(0,10);

void generate_fruit()
{
field_x = (int)random(0,10);
field_y = (int)random(0,10);
}

void set_table()
{

background(0,0,0);
for (int i = 0 ; i < 10; i++)
{
for (int j = 0 ; j < 10; j++)
{
if (!(field_x == i && field_y == j)){

fill(255,255,255);
rect(i*50,j*50,50,50);
}
else
{
fill(0,0,255);
rect(i*50,j*50,50,50);
}

if (i*50 == Player_x && j*50 == Player_y && field_x == i && field_y == j) generate_fruit();
}
}
}

void setup()
{
size(700,700);
set_table();

}

void draw()
{
set_table();
fill(255,0,0);
rect(Player_x,Player_y,50,50);

}

void keyPressed() {

if (keyCode == UP && Player_y > 0) 
{
direction = dup;
Player_y-=50;
}
if (keyCode == DOWN && Player_y < 450) 
{
direction = ddown;
Player_y+=50;  
} 

if (keyCode == LEFT && Player_x > 0) 
{
direction = dleft;
Player_x-=50;
}

if (keyCode == RIGHT  && Player_x <450) 
{
direction = dright;
Player_x+=50;
}

}