feat(world): add multiple hitbox support on actor2D

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **actor2D:** Make hitbox modifiable.
 
+- **actor2D:** Add multiple hitbox support.
+
 ### Changed
 
 - **world2D:** Use a list for bodies (hitboxes, etc) and one other for actors

examples/gameplay/plateform/actors/player.lua

@@ -6,6 +6,9 @@ function Player:new(world, x, y, id)
   self:setSprite("player", 8, 12)
   self:cloneSprite()
   self:setYGravity(480)
+
+  self.isPunching = false
+  self.direction  = 1
 end
 
 function Player:updateStart(dt)
@@ -19,13 +22,29 @@ function Player:updateStart(dt)
   else
     self.mainHitbox:modify(0, 0, 16, 24)
   end
-  if self.keys["left"].isDown then
+  if self.keys["left"].isDown and (not self.isPunching) then
     self.xsp = -120
   end
-  if self.keys["right"].isDown then
+  if self.keys["right"].isDown and (not self.isPunching) then
     self.xsp =  120
   end
 
+  if self.keys["A"].isDown then
+    self.isPunching = true
+    if (self.direction == 1) then
+      self:addHitbox("punch", "punch", 16, 6, 12, 12, false)
+    else
+      self:addHitbox("punch", "punch", -12, 6, 12, 12, false)
+    end
+  else
+    self.isPunching = false
+    self:removeHitbox("punch")
+  end
+
+  if (self.isPunching) then
+    self:checkHitboxCollisions("punch")
+  end
+
   if self.keys["start"].isPressed then
     --self.world:switchActivity()
     --self.assets:switchActivity()
@@ -43,6 +62,9 @@ end
 
 function Player:setAnimation()
   self:setCustomSpeed(math.abs(self.xsp) / 12)
+  if (self.isPunching) then
+    self:changeAnimation("punch", false)
+  else
   if (self.onGround) then
     if math.abs(self.xsp) > 0 then
       self:changeAnimation("walk", false)
@@ -52,12 +74,14 @@ function Player:setAnimation()
   else
     self:changeAnimation("jump", true)
   end
+  end
 end
 
 function Player:setDirection(direction)
   direction = direction or 0
   if direction ~= 0 then
     direction = utils.math.sign(direction)
+    self.direction = direction
     self:setSpriteScallingX(direction)
   end
 end
@@ -68,9 +92,15 @@ function Player:collisionResponse(collision)
   end
 end
 
+function Player:hitboxResponse(name, type, collision)
+  if (collision.other.type == "coin") and (type == "punch") then
+    collision.other.owner:takeCoin(self)
+  end
+end
+
 function Player:draw()
   Player.super.draw(self)
-  self:drawMainHitbox()
+  self:drawHitboxes()
   utils.graphics.resetColor()
 end
 

examples/gameplay/plateform/assets/monkey_lad.lua

@@ -43,8 +43,8 @@ return {
       pauseAtEnd  = false,
     },
     ["punch"] = {
-      startAt     = 10,
-      endAt       = 10,
+      startAt     = 11,
+      endAt       = 11,
       loop        = 1,
       speed       = 0,
       pauseAtEnd  = false,

gamecore/modules/world/actors/actor2D.lua

@@ -34,7 +34,7 @@ local Hitbox  = require(cwd .. "utils.hitbox2D")
 function Actor2D:new(world, type, x, y, w, h, isSolid)
   self:setCoordinate(x, y)
   Actor2D.super.new(self, world, type, isSolid)
-  self:initMainHitbox(w, h)
+  self:initHitboxes(w, h)
 end
 
 function BaseActor:destroy()
@@ -178,14 +178,76 @@ end
 -- HITBOXES FUNCTIONS
 -- Functions related to actor hitboxes
 
-function Actor2D:initMainHitbox(w, h)
+function Actor2D:initHitboxes(w, h)
   self.w  = w or 0
   self.h  = h or 0
 
+  self:initMainHitbox()
+
+  self.hitboxes = {}
+end
+
+function Actor2D:initMainHitbox()
   self.mainHitbox = Hitbox(self, self.type, 0, 0, self.w, self.h, self.isSolid)
   self.world:registerBody(self.mainHitbox)
 end
 
+function Actor2D:addHitbox(name, type, ox, oy, w, h, isSolid)
+  if (self.hitboxes[name] ~= nil) then
+    print("ERROR:", "The hitbox " .. name .. " already exists")
+  else
+    local hitbox = Hitbox(self, type, ox, oy, w, h, isSolid)
+    self.hitboxes[name] = hitbox
+    self.world:registerBody(self.hitboxes[name])
+    return hitbox
+  end
+end
+
+function Actor2D:checkHitboxCollisions(name, filter)
+  self:checkHitboxCollisionsAtPoint(name, self.x, self.y, filter)
+end
+
+function Actor2D:checkHitboxCollisionsAtPoint(name, dx, dy, filter)
+    local x, y, cols, colNumber = dx, dy, {}, 0
+    local filter = filter or self.filter
+    if (self.isDestroyed == false) and (self.hitboxes[name] ~= nil) then
+      x, y, cols, colNumber = self.hitboxes[name]:checkCollision(dx, dy, filter)
+      local type = self.hitboxes[name].type
+
+      for i, col in ipairs(cols) do
+        self:hitboxResponse(name, type, col)
+      end
+    end
+
+    return x, y, cols, colNumber
+end
+
+function Actor2D:hitboxResponse(name, type, collision)
+  -- just a blank placeholder function
+end
+
+function Actor2D:removeHitbox(name)
+  if (self.hitboxes[name] ~= nil) then
+    self.world:removeBody(self.hitboxes[name])
+    self.hitboxes[name] = nil
+  end
+end
+
+function Actor2D:purgeHitbox()
+  for k,v in pairs(self.hitboxes) do
+    self.world:removeBody(v)
+  end
+  self.hitboxes = {}
+end
+
+function Actor2D:drawHitboxes()
+  for k,v in pairs(self.hitboxes) do
+    v:draw()
+  end
+  self.mainHitbox:draw()
+end
+
+
 function Actor2D:drawMainHitbox()
   self.mainHitbox:draw()
 end