private void timer1_Tick(object sender, EventArgs e)
{
//this function is called every time the timer tool is changed (20 milseconds)
//put player ship and score in place
player.Top = Height - 100;
score_label.Top = Height - 75;
//player moving left and right unless out of bounds
if (goleft && player.Left > 0)
{
player.Left -= playerSpeed;
}
else if (goright && player.Left + 75 < Width)
{
player.Left += playerSpeed;
}
// end of player moving left and right
//check for enemy is on form. enemies moving on the form
foreach (Control x in Controls)
{
if (x is PictureBox && (string)x.Tag == "invader")
{
if (((PictureBox)x).Bounds.IntersectsWith(player.Bounds))
{
gameOver();
}
if (((PictureBox)x).Left + speed > Width - 51)
{
change_side(false);
break;
}
else if (((PictureBox)x).Left - speed < 1)
{
change_side(true);
}
}
}
//move on screen
foreach (Control x in Controls)
{
if (x is PictureBox && (string)x.Tag == "invader")
{
((PictureBox)x).Left += speed;
}
}
// end of enemies moving on the form
//animating the bullets and removing them when the have left the scene
foreach (Control y in Controls)
{
if (y is PictureBox && (string)y.Tag == "bullet")
{
y.Top -= 20;
if (((PictureBox)y).Top < 10)// a bit lower than top screen
{
Controls.Remove(y);
}
}
}
// end of animating the bullets.
// bullet and enemy collision start
foreach (Control i in Controls)
{
foreach (Control j in Controls)
{
if (i is PictureBox && (string)i.Tag == "invader")
{
if (j is PictureBox && (string)j.Tag == "bullet")
{
if (i.Bounds.IntersectsWith(j.Bounds))
{
score++;
Controls.Remove(i);
Controls.Remove(j);
}
}
}
}
}
// bullet and enemy collision end
// keeping and showing score
score_label.Text = "Score : " + score;
if (score > totalEnemies - 1)
{
gameOver();
//MessageBox.Show("You Win");
}
// end of keeping and showing score.
}