//returns true if the missile has left the bounds of the canvas
public static bool LeavingScreen(Missile msl)
{
return (msl.Where().X > Missile.canvas.ScaledWidth || msl.Where().X < 0);
}
//predicates
//returns true if missiles have faded away
public static bool MissileDone(Missile msl)
{
return msl._mslAlpha <= 0;
}
//Occurs each timer tick(30ms), moves, evalutes, and draws each missile. Adjusting difficulty
//as the game progresses. Displays some informative text to the user on the canvas.
private void timer1_Tick(object sender, EventArgs e)
{
//functionality for Marathon Game Mode
if (radioButtonMarathon.Checked)
{
//every 100 difficulty ticks, gives each cannon more ammo, and increases
//our static Missile Difficulty
if (difficultyCounter % 100 == 0)
{
foreach (Missile msl in cannonList)
msl.Ammo += (int)(Missile.Difficulty / 10) - 2;
Missile.Difficulty += 2;
difficultyCounter = 0;
}
//adds an enemy missile if enemy count is less than a value that scales with the
//difficulty. With a 1 in 20 chance to add a missile per tick.
if (foesList.Count < Missile.Difficulty / 5 && rnd.Next(1, 20) == 1)
foesList.Add(new Missile());
}
//functionality for Classic Game Mode
if (radioButtonClassic.Checked)
{
//adds an enemy missile if the enemy count is less than the current levels
//total enemy value. With a 1 in 20 chance to add a missile per tick.
if (cmFoeCount < cmFoeTotal && rnd.Next(1, 20) == 1)
{
foesList.Add(new Missile());
cmFoeCount++;
}
//enough enemies have been destroyed, start a new round
else if (cmFoeCount == cmFoeTotal && foesList.Count == 0)
NewRound();
}
//adds a new friendly missile if the user has left clicked on the CDrawer
if (Missile.Canvas.GetLastMouseLeftClickScaled(out pollMouseLocation))
{
//the method for determining the closest available cannon returns (0,0) if no
//cannons are available. So only add a missile if the start point is not (0,0).
Missile m = new Missile(pollMouseLocation, cannonList);
if (m.StartLocation.X != 0 && m.StartLocation.Y != 0)
{
friendsList.Add(m);
friendsLaunched++;
}
}
//perfoms a move operation on each missile in both friend & foe lists
foreach (Missile msl in friendsList)
msl.Move();
foreach (Missile msl in foesList)
msl.Move();
//removes all missiles that evaluate to true, via our predicates
//from both friend & and foe lists
friendsList.RemoveAll(Missile.MissileDone);
friendsList.RemoveAll(Missile.LeavingScreen);
foesList.RemoveAll(Missile.MissileDone);
foesList.RemoveAll(Missile.LeavingScreen);
//set friendly missiles to exploding if they are overlapping with a foe missile
collided = friendsList.Intersect(foesList).ToList();
foreach (Missile msl in collided)
msl.exploding = true;
//set foe missiles to exploding if they are overlapping with a friendly missile
collided = foesList.Intersect(friendsList).ToList();
foreach (Missile msl in collided)
{
msl.exploding = true;
foesDestroyed++;
}
//remove cities that have been hit by enemy missiles
collided = cityList.Intersect(foesList).ToList();
foreach (Missile msl in collided)
while (cityList.Remove(msl));
//set cannons to exploding if they have been hit by enemy missiles
collided = cannonList.Intersect(foesList).ToList();
foreach (Missile msl in collided)
msl.exploding = true;
//clears our CDrawer
Missile.Loading = true;
//render each missile object in all of our missile lists
foreach (Missile msl in friendsList)
msl.Render();
foreach (Missile msl in foesList)
msl.Render();
foreach (Missile c in cityList)
c.RenderCity();
//get the current mouse location before rendering the cannons
Missile.Canvas.GetLastMousePositionScaled(out pollMouseLocation);
foreach (Missile c in cannonList)
c.RenderCannon(pollMouseLocation);
//updates the Score and Difficulty text each tick
Missile.Canvas.AddText("Score: " + (foesDestroyed * 100 + score),
15, 10, 530, 250, 100, Color.Black);
Missile.Canvas.AddText("Diffuculty: " + Missile.DiffucultyString(),
15, 500, 530, 250, 100, Color.Black);
//renders our CDrawer
Missile.Loading = false;
//updates the score text on the main form
lblTotalEnemies.Text = foesList.Count.ToString();
lblEnemiesDestroyed.Text = foesDestroyed.ToString();
lblMisslesFired.Text = friendsLaunched.ToString();
if (friendsLaunched != 0)
lblKillPerShot.Text = (Math.Round(foesDestroyed / friendsLaunched, 2)).ToString();
//used to set the Missile's static Difficulty after so many ticks
difficultyCounter++;
//the user has run out of cities and the game must end
if (cityList.Count <= 0)
{
//ends the current game and starts timer2 for a little end game animation
difficultyCounter = 2;
Missile.Loading = true;
timer2.Enabled = true;
timer1.Enabled = false;
}
}