refactor(levels): use the friction system from gamecore

imperium-porcorum.love/scenes/levels/entities/debris.lua

@@ -10,7 +10,7 @@ function Debris:new(world, x, y, speed, dir, timelimit)
   self:setMotionDirection(dir, speed)
   self.grav = 1
   self:setBounceFactor(0.5)
-  self.frc = 0.046875*60*1.5
+  self.xfrc = 0.046875*60*1.5*60*4
   self.rotation = love.math.random(0, 360)
 end
 
@@ -27,7 +27,7 @@ end
 function Debris:update(dt)
   self:setFilter()
   self:gravity(dt)
-  self:friction(dt)
+  self:applyFriction(dt)
 
   --self.x, self.y, cols, cols_len = currentLevel.world:move(self, self.x + self.xsp*dt, self.y + self.ysp*dt, bulletFilter)
   cols, cols_len = self:move(dt)

imperium-porcorum.love/scenes/levels/entities/parent.lua

@@ -7,11 +7,6 @@ function Entity:new(world, type, x, y, w, h, isSolid)
   Entity.super.new(self, world, type, x, y, w, h, isSolid)
 end
 
-function Entity:initMovement()
-  Entity.super.initMovement(self)
-  self.frc    = 0
-end
-
 function Entity:initGravity()
   self.grav = 0
   self.gacc = 550
@@ -43,12 +38,9 @@ function Entity:gravity(dt)
   self.ysp = self.ysp + self.gacc * self.grav * dt
 end
 
-function Entity:friction(dt)
+function Entity:applyFriction(dt)
-  if (math.abs(self.xsp) <= self.frc) then
+  self.xsp = utils.math.toZero(self.xsp, self.xfrc * dt)
-    self.xsp = 0
+  self.ysp = utils.math.toZero(self.ysp, self.yfrc * dt)
-  else
-    self.xsp = self.xsp - (self.frc * utils.math.sign(self.xsp))
-  end
 end
 
 function Entity:purge()

imperium-porcorum.love/scenes/levels/entities/player.lua

@@ -49,7 +49,7 @@ function Player:initStats()
   self.topsp    = 4.5*60
   self.acc      = 0.046875*60*1.5
   self.dec      = 0.5*60
-  self.frc      = self.acc
+  self.xfrc     = self.acc*60*4
   self.grav     = 1
   self.jmp      = -5*60
 
@@ -156,7 +156,7 @@ function Player:actionMove(dt)
       end
     end
   else
-    self:friction(dt)
+    self:applyFriction(dt)
   end
 
   if (self.grav == 0) then