LÖVE

Code: Select all

if coll.touch.y > goalY then  -- We touched below (remember that higher locations have lower y values) our intended target.
  self.hasReachedMax = true -- this scenario does not occur in this demo
  self.isGrounded = false
elseif coll.normal.y < 0 then
  self.hasReachedMax = false
  self.isGrounded = true
end

Code: Select all

if coll.normal.y > 0 then  -- We touched below (remember that higher locations have lower y values) our intended target.
  self.hasReachedMax = true -- this scenario does not occur in this demo
  self.isGrounded = false
elseif coll.normal.y < 0 then
  self.hasReachedMax = false
  self.isGrounded = true
end

Code: Select all

-- OBJECT.lua
local updateCollisionWorld = function(self)
  if not self.collidable then return end
  if self.collisionWorld:hasItem(self) then self.collisionWorld:update(self, self.x, self.y, self.width, self.height)
  else print("Unable to update collision world for Obj ID'"..tostring(self.type)..", "..tostring(self.id).."': object not found!") end
end

function Object:setPosition(x, y)
  self.x = x or self.x or 0
  self.y = y or self.y or 0
  updateCollisionWorld(self)
end

function Object:move(dx, dy)
  local newx, newy = self.x + dx, self.y + dy
  if self.x == newx and self.y == newy then return end
  if self.velocity.y ~= 0 then self.onGround = false end
  if self.collidable then newx, newy = self:processCollisions(newx, newy) end
  self.x = newx
  self.y = newy
end

function Object:processCollisions(x, y)
  local newx, newy = x, y
  local wx, wy, cols, len = self.collisionWorld:move(self, newx, newy, self.filter)
  if len > 0 then 
    for i=1, #cols do
      local other = cols[i].other
      if self.resolveCollision and other.collidable then
        self:resolveCollision(other)
      end
    end
    newx = wx
    newy = wy
  else
    self.onGround = false
  end

  return newx, newy
end

-- ACTOR.lua
function Actor:filter(other)
  if other.type == "Wall" then return "slide" end
  if other.type == "Portal" then return "cross" end
end

function Actor:resolveCollision(other)
  if other.type == "Wall" then
    -- Ground collision
    if self.y+self.height <= other.y then
      self.onGround = true
      self.velocity.y = 0
    end
  elseif other.type == "Portal" then
    other:teleport(self)
  end
end


-- PORTAL.lua
function Portal:teleport(object)
  local dx, dy = self.destination:getPosition()
  local dw, dh = self.destination:getDimensions()
  
  if self.used then return end
  self:use()
  if self.destination then self.destination:use() end
  object:setPosition(dx+dw/2 - object.width/2, dy+dh/2 - object.height/2)
end

Code: Select all

  local wx, wy, cols, len = self.collisionWorld:move(self, newx, newy, self.filter)
  if len > 0 then 
    for i=1, #cols do
      local other = cols[i].other
      if self.resolveCollision and other.collidable then
        self:resolveCollision(other) -- in here I try to teleport the player(actor) as result of an detected collision...
      end
    end
    newx = wx -- ... but here I basically ignore the changes I made to the position 
    newy = wy -- in the resolveCollision method and use the old ones instead.
  else