1 files changed, 217 insertions, 0 deletions
diff --git a/invaders/game.go b/invaders/game.go
new file mode 100644
index 0000000..54052de
--- /dev/null
+++ b/invaders/game.go
@@ -0,0 +1,217 @@
+package invaders
+
+import (
+	tl "github.com/JoelOtter/termloop"
+	"time"
+)
+
+type Invaders struct {
+	*tl.Entity
+	Game               *tl.Game
+	Level              *tl.BaseLevel
+	Arena              *Arena
+	GameOverZone       *GameOverZone
+	Hud                *Hud
+	Hero               *Hero
+	AlienCluster       *AlienCluster
+	AlienLaserVelocity float64
+	TimeDelta          float64
+	RefreshSpeed       time.Duration
+	Score              int
+	Started            bool
+	ScreenSizeNotOK    bool
+}
+
+func NewGame() *Invaders {
+	invaders := Invaders{
+		Entity:             tl.NewEntity(0, 0, 1, 1),
+		Game:               tl.NewGame(),
+		Level:              tl.NewBaseLevel(tl.Cell{Bg: tl.ColorBlack, Fg: tl.ColorWhite}),
+		AlienLaserVelocity: 0.04,
+		RefreshSpeed:       20,
+		Score:              0,
+	}
+
+	invaders.Game.Screen().SetFps(60)
+	invaders.Game.SetEndKey(tl.KeyBackspace)
+	invaders.Game.Screen().SetLevel(invaders.Level)
+	invaders.Level.AddEntity(&invaders)
+
+	return &invaders
+}
+
+func (invaders *Invaders) Start() {
+	go ShowTitleScreen(invaders)
+	invaders.Game.Start()
+}
+
+func (invaders *Invaders) Tick(event tl.Event) {
+	if invaders.Started == false && invaders.ScreenSizeNotOK == false && event.Type == tl.EventKey && event.Key == tl.KeyEnter {
+		go invaders.initializeGame()
+	}
+}
+
+func (invaders *Invaders) initializeGame() {
+	prepareScreen(invaders)
+
+	invaders.Started = true
+
+	invaders.initHero()
+	invaders.initAliens()
+	invaders.initGameOverZone()
+	invaders.gameLoop()
+}
+
+func (invaders *Invaders) initArena() {
+	screenWidth, screenHeight := invaders.getScreenSize()
+	invaders.Arena = newArena(screenWidth, screenHeight)
+	invaders.Level.AddEntity(invaders.Arena)
+}
+
+func (invaders *Invaders) initHud() {
+	invaders.Hud = NewHud(invaders.Arena, invaders.Level)
+}
+
+func (invaders *Invaders) getScreenSize() (int, int) {
+	screenWidth, screenHeight := invaders.Game.Screen().Size()
+
+	for screenWidth == 0 && screenHeight == 0 {
+		time.Sleep(100 * time.Millisecond)
+		screenWidth, screenHeight = invaders.Game.Screen().Size()
+	}
+
+	return screenWidth, screenHeight
+}
+
+func (invaders *Invaders) initHero() {
+	invaders.Hero = NewHero(invaders.Arena)
+	invaders.Level.AddEntity(invaders.Hero)
+}
+
+func (invaders *Invaders) initAliens() {
+	invaders.AlienCluster = NewAlienCluster()
+	SetPositionAndRenderAliens(invaders.AlienCluster.Aliens, invaders.Level, invaders.Arena)
+}
+
+func (invaders *Invaders) initGameOverZone() {
+	invaders.GameOverZone = CreateGameOverZone(invaders.Arena, invaders.Hero)
+	invaders.Level.AddEntity(invaders.GameOverZone)
+}
+
+func (invaders *Invaders) gameLoop() {
+	for {
+		if invaders.Hero.IsDead() || invaders.AlienCluster.IsAllAliensDead() {
+			invaders.Hero.animateHeroEndGame(invaders.Level)
+			invaders.Started = false
+			break
+		}
+
+		invaders.updateLaserPositions()
+		invaders.RemoveDeadAliensAndIncrementScore()
+		invaders.updateAlienClusterPosition()
+		invaders.updateScore()
+		invaders.verifyGameOverZone()
+
+		time.Sleep(invaders.RefreshSpeed * time.Millisecond)
+	}
+
+	if invaders.Hero.IsDead() {
+		ShowGameOverScreen(invaders)
+	}
+
+	if invaders.AlienCluster.IsAllAliensDead() {
+		invaders.initializeGame()
+	}
+}
+
+func (invaders *Invaders) updateScore() {
+	invaders.Hud.UpdateScore(invaders.Score)
+}
+
+func (invaders *Invaders) updateAlienClusterPosition() {
+	invaders.AlienCluster.UpdateAliensPositions(invaders.Game.Screen().TimeDelta(), invaders.Arena)
+	invaders.AlienCluster.Shoot()
+}
+
+func (invaders *Invaders) RemoveDeadAliensAndIncrementScore() {
+	points := invaders.AlienCluster.RemoveDeadAliensAndGetPoints(invaders.Level)
+	invaders.addScore(points)
+}
+
+func (invaders *Invaders) updateLaserPositions() {
+	invaders.updateHeroLasers()
+	invaders.updateAlienLasers()
+	invaders.removeLasers()
+}
+
+func (invaders *Invaders) updateHeroLasers() {
+	invaders.updateLasers(invaders.Hero.Lasers)
+}
+
+func (invaders *Invaders) updateAlienLasers() {
+	invaders.TimeDelta += invaders.Game.Screen().TimeDelta()
+
+	if invaders.TimeDelta >= invaders.AlienLaserVelocity {
+		invaders.TimeDelta = 0
+		invaders.updateLasers(invaders.AlienCluster.Lasers)
+	}
+}
+
+func (invaders *Invaders) updateLasers(lasers []*Laser) {
+	for _, laser := range lasers {
+		if laser.IsNew {
+			invaders.renderNewLaser(laser)
+			continue
+		}
+
+		x, y := laser.Position()
+		laser.SetPosition(x, y-laser.Direction)
+	}
+}
+
+func (invaders *Invaders) renderNewLaser(laser *Laser) {
+	laser.IsNew = false
+	invaders.Level.AddEntity(laser)
+}
+
+func (invaders *Invaders) removeLasers() {
+	_, arenaY := invaders.Arena.Position()
+	_, arenaH := invaders.Arena.Size()
+
+	upperLimit := arenaY
+	bottomLimit := arenaY + arenaH - 1
+
+	invaders.Hero.Lasers = invaders.removeLaserOf(invaders.Hero.Lasers, upperLimit)
+	invaders.AlienCluster.Lasers = invaders.removeLaserOf(invaders.AlienCluster.Lasers, bottomLimit)
+}
+
+func (invaders *Invaders) removeLaserOf(lasers []*Laser, arenaLimit int) []*Laser {
+	for index, laser := range lasers {
+		_, y := laser.Position()
+		isEndOfArena := y == arenaLimit
+
+		if isEndOfArena || laser.HasHit {
+			invaders.Level.RemoveEntity(laser)
+
+			if laser.HitAlienLaser {
+				invaders.addScore(laser.Points)
+			}
+
+			if index < len(lasers) {
+				lasers = append(lasers[:index], lasers[index+1:]...)
+			}
+		}
+	}
+
+	return lasers
+}
+
+func (invaders *Invaders) addScore(points int) {
+	invaders.Score += points
+}
+
+func (invaders *Invaders) verifyGameOverZone() {
+	if invaders.GameOverZone.EnteredZone {
+		invaders.Hero.IsAlive = false
+	}
+}