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local DEFAULT_CAMERA_SMOOTHING = 30
local SHAKE_NOISE_SPEED = 15
Cam = {}
Cam.__index = Cam
function Cam.new(x, y)
local self = setmetatable({}, Cam)
self.x = x or 0
self.y = y or 0
self.realx = self.x
self.realy = self.y
self.zoom = 1
self.smoothing = DEFAULT_CAMERA_SMOOTHING
self.shake_strength = 0
self.shake_timer_max = 0
self.shake_timer = 0
self.shake_direction = 0
self.shake_damp = EASING_FUNCTIONS.Lerp
self.shake_noise = lmath.noise
return self
end
function Cam:update(dt)
self.realx = dlerp(self.realx, self.x, self.smoothing * dt)
self.realy = dlerp(self.realy, self.y, self.smoothing * dt)
self.shake_timer = self.shake_timer - dt
if self.shake_timer < 0 then
self.shake_strength = 0
end
end
local active_cam = Cam.new()
function get_active_camera()
return active_cam
end
function Cam:shake(strength, time, angle)
if strength < self.shake_strength then
return
end
self.shake_direction = angle -- if nil we just ignore it and randomize
if self.shake_direction then
self.shake_direction = math.rad(self.shake_direction)
end
self.noise_seed = lmath.random() * 1000
self.shake_strength = strength
self.shake_timer = time
self.shake_timer_max = time
end
function set_active_camera(new_cam)
active_cam = new_cam
end
function Cam:getshake()
if self.shake_timer < 0 then
return 0, 0
end
local shakex, shakey = 0, 0
if self.shake_direction then
local size = self.shake_noise(
self.shake_timer * SHAKE_NOISE_SPEED + self.noise_seed)
shakex = math.cos(self.shake_direction) * size
shakey = math.sin(self.shake_direction) * size
else
shakex = self.shake_noise(
self.shake_timer * SHAKE_NOISE_SPEED + self.noise_seed)
shakey = self.shake_noise(
-- 100 is a magic number to offset the x and y noise (so its not just a diagonal shake)
self.shake_timer * SHAKE_NOISE_SPEED + self.noise_seed, 100)
end
local anim = self.shake_timer / self.shake_timer_max
local strength = self.shake_strength * self.shake_damp(0, 1, anim)
shakex = shakex * strength
shakey = shakey * strength
return shakex, shakey
end
function use_camera_transform()
local w, h = SCR_WIDTH / 2, SCR_HEIGHT / 2
lg.scale(active_cam.zoom)
local ox, oy = -active_cam.realx + w / active_cam.zoom,
-active_cam.realy + h / active_cam.zoom
local shakex, shakey = active_cam:getshake()
lg.translate(
round(ox + shakex),
round(oy + shakey))
end
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