added the crates and the crate object plus making them joint

crate.lua

@@ -0,0 +1,65 @@
+-- Chuchu by Makaron
+-- Crates are the main thing so here we go
+
+local CONST_ITERATIONS_RESOLVE = 1
+
+local Crates = {
+  world = nil,
+  player = nil,
+  list = { }
+}
+
+local Crate = { }
+
+local curContact = nil
+
+function Crate.new(world, x, y)
+  local object = {
+    collider = world:addRectangle(x, y, 20, 20)
+  }
+  object.collider:setClass('Crate')
+  object.attached = false
+  object.contact = { }
+  object.joint = nil
+  object.resolver = nil
+
+  object.collider:setPresolve(function (shape1, shape2, contact)
+    print(shape2:getClass())
+    if shape2:getClass() == 'Player' and object.attached == false then
+      contact:setEnabled(false)
+      object.contact.x, object.contact.y = contact:getPositions()
+      object.resolver = CONST_ITERATIONS_RESOLVE
+      object.attached = true
+    end
+  end)
+
+  return setmetatable(object, {
+     __index = Crate
+  })
+end
+
+function Crates:init(world, player)
+  self.world = world
+  self.player = player
+end
+
+function Crates:spawn(x, y)
+  table.insert(self.list, Crate.new(self.world, x, y))
+end
+
+function Crates:update(dt)
+  for key in pairs(self.list) do
+    if self.list[key].resolver ~= nil then
+      self.list[key].resolver = self.list[key].resolver - 1
+      if self.list[key].resolver <= 0 then
+        curContact = self.list[key].contact
+        self.world:addJoint('revolute', self.player.collider, self.list[key].collider, curContact.x, curContact.y, true)
+        self.list[key].resolver = nil
+      end
+    end
+  end
+end
+
+return setmetatable(Crates, {
+  __call = function(_, ...) return new(...) end
+})

main.lua

@@ -3,6 +3,9 @@ Boipus = require('deps.boipushy')
 Physics = require('deps.physics')
 assets = require('deps.cargo').init('data')
 
+-- my own libs
+crates = require('crate')
+
 local CONST_GRAVITY = 512
 local CONST_SIDES = {
   LEFT = {
@@ -22,8 +25,6 @@ local player = {
 }
 
 local magnet = {
-  x = 50,
-  y = 50,
   w = 50,
   h = 50,
   collider = nil,
@@ -44,9 +45,10 @@ function love.load()
   world = Physics(0, 0)
   world:addClass('Player')
   world:addClass('Side')
+  world:addClass('Crate')
   side.left = world:addChain(true, CONST_SIDES.LEFT):setClass('Side')
   side.right = world:addChain(true, CONST_SIDES.RIGHT):setClass('Side')
-  magnet.collider = world:addRectangle(magnet.x, magnet.y, magnet.w, magnet.h):setClass('Player')
+  magnet.collider = world:addRectangle(50, 50, magnet.w, magnet.h):setClass('Player')
   magnet.collider:setRestitution(0)
 
   input = Boipus()
@@ -58,6 +60,10 @@ function love.load()
   input:bind(love.keyboard.getKeyFromScancode('s'), 'moveDown')
   input:bind(love.keyboard.getKeyFromScancode('space'), 'switch')
 
+  crates:init(world, magnet)
+  crates:spawn(120, 400)
+  crates:spawn(150, 400)
+
   -- Gamepad
   --[[input:bind('dpup', 'moveUp')
   input:bind('dpleft', 'moveLeft')
@@ -67,6 +73,7 @@ end
 
 function love.update(dt)
   world:update(dt)
+  crates:update(dt)
 
   --[[ if input:down('moveUp') then magnet.collider:applyLinearImpulse(0, -player.maxSpeed.y) end
   if input:down('moveLeft') then magnet.collider:applyLinearImpulse(-player.maxSpeed.x, 0) end