Expire landing flags after an hour. (b970b8d0) · Commits · e / os / android_frameworks_base

packages/EasterEgg/src/com/android/egg/landroid/Physics.kt

+14 −1

Original line number	Diff line number	Diff line
		@@ -20,7 +20,7 @@ import android.util.ArraySet
		import kotlin.random.Random

		// artificially speed up or slow down the simulation
		const val TIME_SCALE = 1f
		const val TIME_SCALE = 1f // simulation seconds per wall clock second

		// if it's been over 1 real second since our last timestep, don't simulate that elapsed time.
		// this allows the simulation to "pause" when, for example, the activity pauses
		@@ -36,6 +36,19 @@ interface Entity {
		fun postUpdate(sim: Simulator, dt: Float)
		}

		interface Removable {
		fun canBeRemoved(): Boolean
		}

		class Fuse(var lifetime: Float) : Removable {
		fun update(dt: Float) {
		lifetime -= dt
		}
		override fun canBeRemoved(): Boolean {
		return lifetime < 0
		}
		}

		open class Body(var name: String = "Unknown") : Entity {
		var pos = Vec2.Zero
		var opos = Vec2.Zero

packages/EasterEgg/src/com/android/egg/landroid/Universe.kt

+25 −18

Original line number	Diff line number	Diff line
		@@ -43,11 +43,9 @@ const val CRAFT_SPEED_LIMIT = 5_000f
		const val MAIN_ENGINE_ACCEL = 1000f // thrust effect, pixels per second squared
		const val LAUNCH_MECO = 2f // how long to suspend gravity when launching

		const val SCALED_THRUST = true
		const val LANDING_REMOVAL_TIME = 3600f // one hour of simulation time

		interface Removable {
		fun canBeRemoved(): Boolean
		}
		const val SCALED_THRUST = true

		open class Planet(
		val orbitCenter: Vec2,
		@@ -321,7 +319,7 @@ open class Universe(val namer: Namer, randomSeed: Long) : Simulator(randomSeed)
		//
		(1..10).forEach {
		Spark(
		lifetime = rng.nextFloatInRange(0.5f, 2f),
		ttl = rng.nextFloatInRange(0.5f, 2f),
		style = Spark.Style.DOT,
		color = Color.White,
		size = 1f
		@@ -359,13 +357,22 @@ open class Universe(val namer: Namer, randomSeed: Long) : Simulator(randomSeed)
		entities
		.filterIsInstance<Removable>()
		.filter(predicate = Removable::canBeRemoved)
		.filterIsInstance<Entity>()
		.forEach { remove(it) }
		.forEach { remove(it as Entity) }

		constraints
		.filterIsInstance<Removable>()
		.filter(predicate = Removable::canBeRemoved)
		.forEach { remove(it as Constraint) }
		}
		}

		class Landing(var ship: Spacecraft?, val planet: Planet, val angle: Float, val text: String = "") :
		Constraint {
		class Landing(
		var ship: Spacecraft?,
		val planet: Planet,
		val angle: Float,
		val text: String = "",
		private val fuse: Fuse = Fuse(LANDING_REMOVAL_TIME)
		) : Constraint, Removable by fuse {
		override fun solve(sim: Simulator, dt: Float) {
		ship?.let { ship ->
		val landingVector = Vec2.makeWithAngleMag(angle, ship.radius + planet.radius)
		@@ -373,17 +380,20 @@ class Landing(var ship: Spacecraft?, val planet: Planet, val angle: Float, val t
		ship.pos = (ship.pos * 0.5f) + (desiredPos * 0.5f) // @@@ FIXME
		ship.angle = angle
		}

		fuse.update(dt)
		}
		}

		class Spark(
		var lifetime: Float,
		var ttl: Float,
		collides: Boolean = false,
		mass: Float = 0f,
		val style: Style = Style.LINE,
		val color: Color = Color.Gray,
		val size: Float = 2f
		) : Removable, Body() {
		val size: Float = 2f,
		val fuse: Fuse = Fuse(ttl)
		) : Removable by fuse, Body(name = "Spark") {
		enum class Style {
		LINE,
		LINE_ABSOLUTE,
		@@ -398,10 +408,7 @@ class Spark(
		}
		override fun update(sim: Simulator, dt: Float) {
		super.update(sim, dt)
		lifetime -= dt
		}
		override fun canBeRemoved(): Boolean {
		return lifetime < 0
		fuse.update(dt)
		}
		}

		@@ -486,11 +493,11 @@ class Spacecraft : Body() {
		// exhaust
		sim.add(
		Spark(
		lifetime = sim.rng.nextFloatInRange(0.5f, 1f),
		ttl = sim.rng.nextFloatInRange(0.5f, 1f),
		collides = true,
		mass = 1f,
		style = Spark.Style.RING,
		size = 3f,
		size = 1f,
		color = Color(0x40FFFFFF)
		)
		.also { spark ->

packages/EasterEgg/src/com/android/egg/landroid/VisibleUniverse.kt

+10 −2

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ import androidx.compose.ui.util.lerp
		import androidx.core.math.MathUtils.clamp
		import com.android.egg.flags.Flags.flagFlag
		import java.lang.Float.max
		import kotlin.math.exp
		import kotlin.math.sqrt

		const val DRAW_ORBITS = true
		@@ -289,7 +290,8 @@ fun ZoomedDrawScope.drawLanding(landing: Landing) {

		fun ZoomedDrawScope.drawSpark(spark: Spark) {
		with(spark) {
		if (lifetime < 0) return
		if (fuse.lifetime < 0) return
		val life = 1f - fuse.lifetime / ttl
		when (style) {
		Spark.Style.LINE ->
		if (opos != Vec2.Zero) drawLine(color, opos, pos, strokeWidth = size)
		@@ -297,7 +299,13 @@ fun ZoomedDrawScope.drawSpark(spark: Spark) {
		if (opos != Vec2.Zero) drawLine(color, opos, pos, strokeWidth = size / zoom)
		Spark.Style.DOT -> drawCircle(color, size, pos)
		Spark.Style.DOT_ABSOLUTE -> drawCircle(color, size, pos / zoom)
		Spark.Style.RING -> drawCircle(color, size, pos, style = Stroke(width = 1f / zoom))
		Spark.Style.RING ->
		drawCircle(
		color = color.copy(alpha = color.alpha * (1f - life)),
		radius = exp(lerp(size, 3f * size, life)) - 1f,
		center = pos,
		style = Stroke(width = 1f / zoom)
		)
		}
		}
		}