From 77f087952dda8cd3608f578877dab3c667fedabc Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Mon, 28 Feb 2022 03:52:24 +0530
Subject: Adds Screen Shake on every 10 seconds

---
 libs/shack.lua | 146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 libs/shack.lua

(limited to 'libs/shack.lua')

diff --git a/libs/shack.lua b/libs/shack.lua
new file mode 100644
index 0000000..337bc09
--- /dev/null
+++ b/libs/shack.lua
@@ -0,0 +1,146 @@
+-- shack.lua v0.1
+
+-- Copyright (c) 2015 Ulysse Ramage
+-- Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+-- The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+local shack = {
+  shaking = 0,
+  shakingTarget = 0,
+  
+  rotation = 0,
+  rotationTarget = 0,
+  
+  scale = { x = 1, y = 1 },
+  scaleTarget = { x = 1, y = 1 },
+  
+  shear = { x = 0, y = 0 },
+  shearTarget = { x = 0, y = 0 },
+  
+  width = love.graphics.getWidth(),
+  height = love.graphics.getHeight()
+}
+setmetatable(shack, shack)
+
+--[[ Private ]]--
+
+local function lerp(a, b, k) --smooth transitions
+  if a == b then
+    return a
+  else
+    if math.abs(a-b) < 0.005 then return b else return a * (1-k) + b * k end
+  end
+end
+
+--[[ Public ]]--
+
+function shack:setDimensions(width, height)
+  self.width, self.height = width, height
+  return self
+end
+
+function shack:update(dt)
+  
+  local _speed = 7
+  
+  self.shaking = lerp(self.shaking, self.shakingTarget, _speed*dt)
+  self.rotation = lerp(self.rotation, self.rotationTarget, _speed*dt)
+  
+  self.scale.x = lerp(self.scale.x, self.scaleTarget.x, _speed*dt)
+  self.scale.y = lerp(self.scale.y, self.scaleTarget.y, _speed*dt)
+  
+  self.shear.x = lerp(self.shear.x, self.shearTarget.x, _speed*dt)
+  self.shear.y = lerp(self.shear.y, self.shearTarget.y, _speed*dt)
+
+end
+
+function shack:apply()
+  love.graphics.translate(self.width*.5, self.height*.5)
+  love.graphics.rotate((math.random()-.5)*self.rotation)
+  love.graphics.scale(self.scale.x, self.scale.y)
+  love.graphics.translate(-self.width*.5, -self.height*.5)
+  
+  love.graphics.translate((math.random()-.5)*self.shaking, (math.random()-.5)*self.shaking)
+  
+  love.graphics.shear(self.shear.x*.01, self.shear.y*.01)
+  
+  return self
+end
+
+--
+
+function shack:setShake(shaking)
+  self.shaking = shaking or 0
+  return self
+end
+
+function shack:setRotation(rotation)
+  self.rotation = rotation or 0
+  return self
+end
+
+function shack:setShear(x, y)
+  self.shear = { x = x or 0, y = y or 0 }
+  return self
+end
+
+function shack:setScale(x, y)
+  if not y then
+    local _s = x or 1
+    self.scale = { x = _s, y = _s }
+  else
+    self.scale = { x = x or 1, y = y or 1 }
+  end
+  return self
+end
+
+function shack:setShakeTarget(shaking)
+  self.shakingTarget = shaking or 0
+  return self
+end
+
+function shack:setRotationTarget(rotation)
+  self.rotationTarget = rotation or 0
+  return self
+end
+
+function shack:setScaleTarget(x, y)
+  if not y then
+    local _s = x or 1
+    self.scaleTarget = { x = _s, y = _s }
+  else
+    self.scaleTarget = { x = x or 1, y = y or 1 }
+  end
+  return self
+end
+
+function shack:setShearTarget(x, y)
+  self.shearTarget = { x = x or 0, y = y or 0 }
+  return self
+end
+
+--
+
+function shack:getShake() return self.shaking end
+function shack:getShakeTarget() return self.shakingTarget end
+
+function shack:getRotation() return self.rotation end
+function shack:getRotationTarget() return self.rotationTarget end
+
+function shack:getScale() return self.scale.x, self.scale.y end
+function shack:getScaleTarget() return self.scaleTarget.x, self.scaleTarget.y end
+
+function shack:getShear() return self.shear.x, self.shear.y end
+function shack:getShearTarget() return self.shearTarget.x, self.shearTarget.y end
+
+--[[ Aliases ]]--
+
+function shack:shake(...) return self:setShake(...) end
+function shack:rotate(...) return self:setRotation(...) end
+function shack:zoom(...) return self:setScale(...) end
+function shack:tilt(...) return self:setShear(...) end
+
+--[[ End ]]--
+
+return shack
\ No newline at end of file
-- 
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