// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// ResetGameWorld() method
// resets variables and initializes and empties lists and objects to prepare new game
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public void ResetGameWorld()
{
_currentLives = _lives; //reset player lives
_score = 0; //reset score
_astDelay = 500; //reset asteroid tick delay
_curAstDelay = _astDelay; //reset current asteroid delay
//create new ship.
ss = new SpaceShip(ClientRectangle.Size, new PointF(ClientRectangle.Width / 2, ClientRectangle.Height / 2));
//clear any leftover bullets from last game
//ss._bullets.Clear();
//reset life display ships
_livesDisplay = new List <SpaceShip>();
for (int i = 1; i <= _lives; i++)
{
_livesDisplay.Add(new SpaceShip(ClientRectangle.Size, new PointF(i * 50, 50)));
}
//create initial asteroids
_astBelt = new List <Asteroid>();
for (int i = 0; i < _asteroidNumber; i++)
{
_astBelt.Add(new Asteroid(new PointF(_rng.Next(ClientRectangle.Width), _rng.Next(ClientRectangle.Height)), Asteroid.astSize.large));
}
}
private void GameTimer_Tick(object sender, EventArgs e)
{
//double buffer graffics to remove stutter
using (BufferedGraphicsContext bgc = new BufferedGraphicsContext())
{
using (BufferedGraphics bg = bgc.Allocate(CreateGraphics(), ClientRectangle))
{
//if game over is false, animate and render game
if (!_gameOver)
{
//smooth edges of shapes
bg.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
//create black background
bg.Graphics.FillRectangle(new SolidBrush(Color.Black), ClientRectangle);
//determine if pause is selected
_nextPause = VGInput.pause;
//if pause is pressed, and not pressed last frame, toggle pause
if (_nextPause && !_lastPause)
{
_paused = !_paused;
}
//save current pause for next tick
_lastPause = _nextPause;
//if not paused, move each animated object and check for collisions
if (!_paused)
{
//add asteroid every n ticks
_curAstDelay--;
//of delay counter is finish, reset and reduce delay, add asteroid
if (_curAstDelay <= 0)
{
//reduce delay before asteroid spawn, limit to above 100 ticks
_astDelay = (_astDelay - 20 >= 100) ? _astDelay - 20 : 100;
_curAstDelay = _astDelay;
//add new asteroid to game
_astBelt.Add(new Asteroid(new PointF(_rng.Next(ClientRectangle.Width), _rng.Next(ClientRectangle.Height)), Asteroid.astSize.large));
}
//tick asteroids and ship/bullets
_astBelt.ForEach((s) => s.Tick(ClientRectangle.Size));
ss.Tick(VGInput.left, VGInput.right, VGInput.thrust, VGInput.warp, VGInput.shoot, ClientRectangle.Size);
//check if ship is dead
Region shipReg = new Region(ss.GetPath());
//bool causes loop to exit if collision detected to prevent more than one death from being registered
bool exitColLoop = false;
//if ship is not invincible, check for collisions with asteroids
if (!ss._invincible)
{
//iterate through all asteroids
for (int i = 0; i < _astBelt.Count(); i++)
{
//if asteroid is not fading in test for collision with ship
if (_astBelt[i]._dangerous && !exitColLoop)
{
Region astReg = new Region(_astBelt[i].GetPath());
//intersect asteroid and ship regions
astReg.Intersect(shipReg);
//is intersection is not empty, there is a collision
if (!astReg.IsEmpty(bg.Graphics))
{
//kill old ship, make new one
ss._alive = false;
ss = new SpaceShip(ClientRectangle.Size, new PointF(ClientRectangle.Width / 2, ClientRectangle.Height / 2));
//play death sound
music.Play2D("../../../wilhelm.wav", false);
//don't check any more asteroids to prevent muptiple collitions
exitColLoop = true;
//remove life from display and counter
if (_livesDisplay.Count() > 0)
{
_livesDisplay.RemoveAt(_livesDisplay.Count() - 1);
}
_currentLives--;
//game over if all lives gone
if (_currentLives <= 0)
{
_gameOver = true;
}
}
}
}
}
//reset for use with bullet/asteroid collisions
exitColLoop = false;
//iterate through bullets and asteroids
for (int j = 0; j < ss._bullets.Count(); j++)
{
for (int k = 0; k < _astBelt.Count(); k++)
{
//intersect bullet and asteroid regions
Region bullReg = new Region(ss._bullets[j].GetPath());
Region asReg = new Region(_astBelt[k].GetPath());
asReg.Intersect(bullReg);
//if collision detected, kill asteroid, add score
if (!asReg.IsEmpty(bg.Graphics) && !exitColLoop)
{
//kill asteroid and bullet
ss._bullets[j]._alive = false;
_astBelt[k]._markedForDeath = true;
exitColLoop = true;
//check size of dead asteroid
if (_astBelt[k]._astSize == Asteroid.astSize.large)
{
//if large, add two medium asteroids
for (int l = 0; l < 2; l++)
{
_astBelt.Add(new Asteroid(_astBelt[k]._pos, Asteroid.astSize.medium));
}
//increase score for large
_score += 100;
}
else if (_astBelt[k]._astSize == Asteroid.astSize.medium)
{
//if medium add 3 small
for (int m = 0; m < 3; m++)
{
_astBelt.Add(new Asteroid(_astBelt[k]._pos, Asteroid.astSize.small));
}
//increase score for medium
_score += 200;
}
else
{
//increase score for small
_score += 300;
}
//see if score has reached points to extra life
if (_score > _scoreToLife)
{
//increase lives and add to live display ship list
_currentLives++;
_livesDisplay.Add(new SpaceShip(ClientRectangle.Size, new PointF(_currentLives * 50, 50)));
//double score needed to next life
_scoreToLife *= 2;
}
}
}
}
//remove dead asteroids from list
_astBelt.RemoveAll(a => a._markedForDeath);
}
else
{
//if game paused display "pause" on screen
bg.Graphics.DrawString("Pause", new Font(FontFamily.GenericSansSerif, 60), new SolidBrush(Color.YellowGreen), ClientRectangle.Width / 2 - 130, ClientRectangle.Height / 2 - 50);
}
//display score and lives
_livesDisplay.ForEach(l => l.Render(bg));
bg.Graphics.DrawString("score: " + _score.ToString(), new Font(FontFamily.GenericSansSerif, 16), new SolidBrush(Color.GreenYellow), 20, 0);
//render asteroids and ship/bullets
_astBelt.ForEach((s) => s.Render(bg));
ss.Render(bg);
}
else
{
//if gameover is true, display main menu
bg.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
bg.Graphics.FillRectangle(new SolidBrush(Color.Black), ClientRectangle);
bg.Graphics.DrawString("Astheroids", new Font(FontFamily.GenericSansSerif, 100), new SolidBrush(Color.White), 160, 100);
bg.Graphics.DrawString("PAUSE = ESC / START", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), 0, ClientRectangle.Height - 200);
bg.Graphics.DrawString("SHOOT = SPACE / A BUTTON", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), 0, ClientRectangle.Height - 160);
bg.Graphics.DrawString("TURN = LEFT/RIGHT / RIGHT ANALOG STICK", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), 0, ClientRectangle.Height - 120);
bg.Graphics.DrawString("THRUST = UP / RIGHT TRIGGER", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), 0, ClientRectangle.Height - 80);
bg.Graphics.DrawString("WARP SPEED = W / LEFT TRIGGER", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), 0, ClientRectangle.Height - 40);
bg.Graphics.DrawString("SHOOT to start game", new Font(FontFamily.GenericSansSerif, 20), new SolidBrush(Color.GreenYellow), ClientRectangle.Width / 2 - 160, ClientRectangle.Height / 2);
//only display game over and score if a game has been finished
if (!firstRun)
{
bg.Graphics.DrawString("GAME OVER", new Font(FontFamily.GenericSansSerif, 80), new SolidBrush(Color.White), 150, 220);
bg.Graphics.DrawString("score: " + _score, new Font(FontFamily.GenericSansSerif, 40), new SolidBrush(Color.White), 320, 420);
}
//detect button press to restart game.
//button must be released and pressed to prevent new game from starting immediately if shoot button is held down when
//game ends
if (VGInput.shoot && !_restart)
{
//reset game world
_gameOver = false;
firstRun = false;
ResetGameWorld();
}
_restart = VGInput.shoot;
}
//render graphics from backbuffer
bg.Render();
}
}
}
