feat(actor3D): add a basic 3D box drawing system for 3D actors

examples/gameplay/moveplayer3D/actors/wall.lua

@@ -4,11 +4,7 @@ local Wall = Base:extend()
 function Wall:new(world, x, y, z, w, h, d)
   Wall.super.new(self, world, "wall", x, y, z, w, h, d, true)
   self:setDebugColor(0,0,0)
-end
-
-function Wall:draw()
-  self:drawMainHitbox()
-  utils.graphics.resetColor( )
+  self.boxes.Base(self, w, h, d)
 end
 
 return Wall

gamecore/modules/world/actors/actor3D.lua

@@ -27,6 +27,7 @@ local BaseActor = require(cwd .. "baseactor")
 local Actor3D = BaseActor:extend()
 
 local Hitbox  = require(cwd .. "utils.hitbox3D")
+local Boxes   = require(cwd .. "utils.boxes")
 
 -- INIT FUNCTIONS
 -- Initialise the actor and its base functions
@@ -35,6 +36,7 @@ function Actor3D:new(world, type, x, y, z, w, h, d, isSolid)
   Actor3D.super.new(self, world, type, x, y, z, w, h, d, isSolid)
   self:initHitboxes()
   self.world:registerShape(self)
+  self.boxes = Boxes
 end
 
 function Actor3D:destroy()
@@ -208,8 +210,12 @@ end
 
 function Actor3D:draw()
   self:drawStart()
+  if (self.box ~= nil) then
+    self.box:draw(self.x, self.y, self.z)
+  else
     local x, y = math.floor(self.x), math.floor(self.y - self.z - self.d + (self.h/2))
     self:drawSprite(x, y)
+  end
   self:drawEnd()
 end
 

gamecore/modules/world/actors/utils/boxes/init.lua

@@ -0,0 +1,30 @@
+-- box3D :: drawable box with shadow handling for fake3D actors
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  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 cwd   = (...):gsub('%.init$', '') .. "."
+
+local Boxes = {}
+
+Boxes.Base = require(cwd .. "parent")
+
+return Boxes

gamecore/modules/world/actors/utils/boxes/parent.lua

@@ -0,0 +1,93 @@
+-- box3D :: drawable box with shadow handling for fake3D actors
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  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 Box3D = Object:extend()
+
+function Box3D:new(owner, w, h, d)
+  self.owner = owner
+
+  self.w = w
+  self.h = h
+  self.d = d
+
+  self.haveLine = true
+
+  self.texture = {}
+  self:setTopTexture()
+  self:setBottomTexture()
+
+  self:register()
+end
+
+function Box3D:register()
+  self.owner.box = self
+end
+
+function Box3D:setSizeFromOwner()
+  self:setSize(self.owner.w, self.owner.h, self.owner.d)
+end
+
+function Box3D:setSize()
+  self.w = w
+  self.h = h
+  self.d = d
+
+  self:regenerate()
+end
+
+function Box3D:setTopTexture()
+  local canvas = love.graphics.newCanvas(self.w, self.h)
+  love.graphics.setCanvas( canvas )
+  utils.graphics.resetColor()
+  love.graphics.rectangle("fill", 0, 0, self.w, self.h)
+  love.graphics.setCanvas( )
+  local imagedata = canvas:newImageData()
+  self.texture.top = love.graphics.newImage( imagedata )
+  imagedata:release()
+  canvas:release()
+end
+
+function Box3D:setBottomTexture()
+  local canvas = love.graphics.newCanvas(self.w, self.d)
+  love.graphics.setCanvas( canvas )
+  love.graphics.setColor(0.9, 0.9, 0.9, 1)
+  love.graphics.rectangle("fill", 0, 0, self.w, self.d)
+  utils.graphics.resetColor()
+  love.graphics.setCanvas( )
+  local imagedata = canvas:newImageData()
+  self.texture.bottom = love.graphics.newImage( imagedata )
+  imagedata:release()
+  canvas:release()
+end
+
+function Box3D:draw(x, y, z)
+  love.graphics.setColor(0, 0, 0, 1)
+  if (self.haveLine) then
+    love.graphics.rectangle("line", x, (y-z) - (self.d), self.w, self.d + self.h)
+  end
+  utils.graphics.resetColor()
+  love.graphics.draw(self.texture.top, x, (y-z) - (self.d))
+  love.graphics.draw(self.texture.bottom, x, (y-z) - (self.d) + (self.h))
+end
+
+return Box3D