Added Big Mode as a piece type. (#20)

Survival A3 and Phantom Mania 2 are now in their fully complete glory! :D

Implements #13.

tetris/components/piece.lua

@@ -2,7 +2,7 @@ local Object = require 'libs.classic'
 
 local Piece = Object:extend()
 
-function Piece:new(shape, rotation, position, block_offsets, gravity, lock_delay, skin)
+function Piece:new(shape, rotation, position, block_offsets, gravity, lock_delay, skin, big)
 	self.shape = shape
 	self.rotation = rotation
 	self.position = position
@@ -12,6 +12,7 @@ function Piece:new(shape, rotation, position, block_offsets, gravity, lock_delay
 	self.skin = skin
 	self.ghost = false
 	self.locked = false
+	self.big = big
 end
 
 -- Functions that return a new piece to test in rotation systems.
@@ -20,7 +21,7 @@ function Piece:withOffset(offset)
 	return Piece(
 		self.shape, self.rotation,
 		{x = self.position.x + offset.x, y = self.position.y + offset.y},
-		self.block_offsets, self.gravity, self.lock_delay, self.skin
+		self.block_offsets, self.gravity, self.lock_delay, self.skin, self.big
 	)
 end
 
@@ -30,7 +31,7 @@ function Piece:withRelativeRotation(rot)
 	while new_rot >= 4 do new_rot = new_rot - 4 end
 	return Piece(
 		self.shape, new_rot, self.position,
-		self.block_offsets, self.gravity, self.lock_delay, self.skin
+		self.block_offsets, self.gravity, self.lock_delay, self.skin, self.big
 	)
 end
 
@@ -145,7 +146,18 @@ function Piece:draw(opacity, brightness, grid, partial_das)
 	for index, offset in pairs(offsets) do
 		local x = self.position.x + offset.x
 		local y = self.position.y + offset.y
-		love.graphics.draw(blocks[self.skin][self.shape], 64+x*16+partial_das, 16+y*16+gravity_offset)
+		if self.big then
+			love.graphics.draw(
+				blocks[self.skin][self.shape],
+				64+x*32+partial_das*2, 16+y*32+gravity_offset*2,
+				0, 2, 2
+			)
+		else
+			love.graphics.draw(
+				blocks[self.skin][self.shape],
+				64+x*16+partial_das, 16+y*16+gravity_offset
+			)
+		end
 	end
 	return false
 end