public void timer1_Tick(object sender, EventArgs e)
{
//Memorizing the last increment, to avoid the situation when pressing opposite arrow keys at the same time kills the snake instantly
if (incre.x == incRec.x && incre.y == -(incRec.y) && incre.y != 0)
{
incre.y = incRec.y;
}
else if (incre.x == -(incRec.x) && incre.y == incRec.y && incre.x != 0)
{
incre.x = incRec.x;
}
incRec.x = incre.x;
incRec.y = incre.y;
Point addPoint = new Point();
addPoint.X = snake.getEnd().point.X + incre.x;
addPoint.Y = snake.getEnd().point.Y + incre.y;
if (checkBox1.Checked)
{
//if crossing the boundries is allowed, when the snake reaches the boundries, set it to appear from the other side
turnAround(ref addPoint);
}
if (addPoint.X > snakeCoord.count - 1 || addPoint.Y > snakeCoord.count - 1 || addPoint.X < 0 || addPoint.Y < 0)
{
//if the snake moves out of the boundries
gameOver();
return;
}
if (snake.overlaps(addPoint) || obs.overlaps(addPoint))
{
//if the snake hits any obstacles
gameOver();
return;
}
if (sectList.collision(apple.point, addPoint))
{
//if the snake swallows an apple, its length will increase by 1, and we need to set a new apple
snake.append(addPoint, pictureBox1, snakeColor);
setApple();
}
else
{
//normal movement of the snake, by adding a new square to the head, as well as removing one from the tail
snake.append(addPoint, pictureBox1, snakeColor);
snake.remove_front();
}
}