func initCritterSprites(width, height int32) {
// The factor .75/64. should yield the same size as the original game
// for a 1920x1080 display
radius := int32(math32.Sqrt(float32(width*height)) * (.75 / 64.))
const frameCount = 60
for k := range critterSeq {
critterSeq[k] = sprite.MakeAnimation(int(radius), k == 0, frameCount)
}
}
// Update state of live aliens
func updateLive(dt float32) {
x0, y0 := Zoo[0].Sx, Zoo[0].Sy
for k := 1; k < len(Zoo); k++ {
c := &Zoo[k]
// Update S and v
bounce(&c.Sx, &c.vx, xSize-1, dt)
bounce(&c.Sy, &c.vy, ySize-1, dt)
// Update Progress
c.Progress += c.fallRate * dt
// Update health
if c.health > 0 {
// Healthy alien
if c.Progress >= 1 {
// Alien reached full power!
if !isPractice {
gameState = GameLose
}
// Mark alien for culling
c.health = deathThreshold
continue
}
dx := c.Sx - x0
dy := c.Sy - y0
if dx*dx+dy*dy <= killRadius2 {
const killTime = 0.1
c.health -= healthType(dt * (float32(initialHealth) / killTime))
if c.health <= 0 {
c.health = -1 // Transition to death sequence
sound.Play(sound.Twang, alienPitch[c.Id])
}
c.Show = true
} else {
c.Show = showAlways
}
} else {
// Dying alien
c.health -= 1
c.Show = true
}
// Update amplitude
if c.health > 0 {
c.Amplitude = math32.Sqrt(c.Progress)
} else {
c.Amplitude -= dt * (1 / amplitudeDieTime)
if c.Amplitude < 0 {
// Alien croaked. Mark as dead
c.health = deathThreshold
if !isPractice {
TallyKill()
}
}
}
}
}
func (context) Init(width, height int32) {
if width < 640 || height < 400 {
panic(fmt.Sprintf("screen size of %v x %v is too small!", width, height))
}
screenWidth, screenHeight = width, height
nShade := int32(math32.Round(math32.Sqrt(float32(width*height)) * (32. / 1440)))
initCritterSprites(width, height)
pastels = coloring.PastelPalette(universe.MaxCritter, nShade)
teletype.Init("Characters.png")
if benchmarking {
bootSequencePeriod = 0
setMode(modeTraining)
} else {
setMode(modeSplash) // N.B. also causes partitionScreen to be called
if devConfig {
teletype.Print("[debug mode]\n")
}
}
}
// Items for "Ratings" menu
var (
highScores *menu.SimpleItem
cpuSpeed = menu.MakeSimpleItem("CPU Speed", func() {
teletype.Reset()
teletype.PrintUpper(fmt.Sprintf("HFT SPEED = %.1f GFlops\n", fourier.Benchmark()*1E-9))
})
)
// State of stationary/moving radio buttons on the "Invaders" menu.
var letFrequonsMove = menu.RadioState{OnSelect: func(value int) {
if value == 0 {
universe.SetVelocityMax(0)
} else {
universe.SetVelocityMax(30. / 1440. * math32.Sqrt(float32(screenWidth*screenHeight)))
}
}}
// State of "maximum number of Frequons" buttons on the "Invaders" menu.
var maxFrequon = menu.RadioState{Value: 1, OnSelect: func(value int) {
universe.SetNLiveMax(value)
}}
// Entry for "Color" menu
type colorSchemeItem struct {
name string // Name of scheme
missing coloring.SchemeBits // Aspect that is missing from the color scheme
}
var colorSchemeInfo = []colorSchemeItem{