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spinning asteroids

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This commit is contained in:
Donald Ball 2025-11-17 23:15:21 -05:00
parent eae3659768
commit 63b296e19c
2 changed files with 5 additions and 4 deletions
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6
asteroids/main.lua
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@ -58,7 +58,7 @@ local function initState()
local stage = game.asteroids.stages[asteroid.stage] local stage = game.asteroids.stages[asteroid.stage]
asteroid.speed = stage.speed asteroid.speed = stage.speed
asteroid.facing = math.random() * phys.tau asteroid.facing = math.random() * phys.tau
asteroid.spin = 2 + math.random() * 5 asteroid.spin = 0.1 + math.random() * 0.1
asteroid.radius = stage.radius asteroid.radius = stage.radius
asteroid.sprite = stage.sprite asteroid.sprite = stage.sprite
end end
@ -141,7 +141,7 @@ function love.update(dt)
radius = radius, radius = radius,
speed = speed, speed = speed,
facing = math.random() * phys.tau, facing = math.random() * phys.tau,
spin = 2 + math.random() * 5, spin = 0.1 + math.random() * 0.1,
sprite = sprite, sprite = sprite,
}) })
table.insert(state.asteroids, { table.insert(state.asteroids, {
@ -152,7 +152,7 @@ function love.update(dt)
radius = radius, radius = radius,
speed = speed, speed = speed,
facing = math.random() * phys.tau, facing = math.random() * phys.tau,
spin = 2 + math.random() * 5, spin = 0.1 + math.random() * 0.1,
sprite = sprite, sprite = sprite,
}) })
end end

3
asteroids/phys.lua
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@ -10,12 +10,13 @@ function phys.intersects(actor1, actor2)
end end
-- updates the actor's location by applying the passage of time -- updates the actor's location by applying the passage of time
-- TODO spin
function phys.update(actor, dt) function phys.update(actor, dt)
assert(actor.speed >= 0) assert(actor.speed >= 0)
local dv = actor.speed * dt local dv = actor.speed * dt
actor.x = actor.x + math.cos(actor.angle) * dv actor.x = actor.x + math.cos(actor.angle) * dv
actor.y = actor.y + math.sin(actor.angle) * dv actor.y = actor.y + math.sin(actor.angle) * dv
local dr = actor.spin * dt
actor.facing = (actor.facing + dr) % phys.tau
end end
function phys.apply(actor, force) function phys.apply(actor, force)