From 0506e2dd9cb9641486bbfc7908c0399b26e1ce3c Mon Sep 17 00:00:00 2001
From: Aki <nthirtyone@gmail.com>
Date: Fri, 13 May 2016 15:00:13 +0200
Subject: Basic camera added

---
 camera.lua | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 ground.lua |  2 +-
 main.lua   | 12 +++++++++---
 player.lua |  2 +-
 4 files changed, 62 insertions(+), 5 deletions(-)
 create mode 100644 camera.lua

diff --git a/camera.lua b/camera.lua
new file mode 100644
index 0000000..793b0d1
--- /dev/null
+++ b/camera.lua
@@ -0,0 +1,51 @@
+-- `Camera`
+-- Used in drawing.
+
+-- Metatable of `Camera`
+Camera = {
+	x = 0,
+	y = 0,
+	follow = nil
+}
+
+-- Constructor of `Camera`
+function Camera:new ()
+	local o = {}
+	setmetatable(o, self)
+	self.__index = self
+	o.follow = {}
+	return o
+end
+
+-- Drawing offsets
+function Camera:getOffsets ()
+	return -self.x,-self.y
+end
+
+-- Position
+function Camera:setPosition (x, y)
+	local x = x or 0
+	local y = y or 0
+	self.x, self.y = x, y
+end
+
+-- Add follow position
+function Camera:addFollow (x, y, w)
+	local w = 1
+	if x ~= nil and y ~= nil then
+		table.insert(self.follow, {["x"] = x, ["y"] = y, ["w"] = w})
+	end
+end
+
+-- Move follow
+function Camera:moveFollow ()
+	local x,y,i = 145, 90, 1
+	for k,point in pairs(Nauts) do
+		i = i + 1
+		x = math.max(math.min(point.body:getX(),290),0) + x
+		y = math.max(math.min(point.body:getY(),180),0) + y
+	end
+	x = x / i - 145
+	y = y / i - 90
+	self:setPosition(x,y)
+end
\ No newline at end of file
diff --git a/ground.lua b/ground.lua
index 9f695c8..23b4dcf 100644
--- a/ground.lua
+++ b/ground.lua
@@ -34,7 +34,7 @@ function Ground:draw (offset_x, offset_y, debug)
 	local debug = debug or false
 	-- sprite draw
 	love.graphics.setColor(255,255,255,255)
-	love.graphics.draw(self.sprite, self.body:getX()-math.ceil(self.sprite:getWidth()/2), self.body:getY())
+	love.graphics.draw(self.sprite, self.body:getX()-math.ceil(self.sprite:getWidth()/2)+offset_x, self.body:getY()+offset_y)
 	-- debug draw
 	if debug then
 		love.graphics.setColor(220, 220, 220, 100)
diff --git a/main.lua b/main.lua
index d5b4d1a..3a895bf 100644
--- a/main.lua
+++ b/main.lua
@@ -3,6 +3,7 @@
 
 require "ground"
 require "player"
+require "camera"
 
 debug = false
 
@@ -15,7 +16,7 @@ function love.load ()
 	love.physics.setMeter(64)
 	world = love.physics.newWorld(0, 9.81*64, true)
 	world:setCallbacks(beginContact, endContact, preSolve, postSolve)
-
+	
 	-- Platforms (`Ground`)
 	Platforms = {}
 	table.insert(Platforms, Ground:new(world, 290/2, 180/2, {-91,0, 90,0, 90,10, 5,76, -5,76, -91,10}, "assets/platform_big.png"))
@@ -36,11 +37,15 @@ function love.load ()
 	Nauts[2].key_down = "s"
 	Nauts[2].key_jump = "h"
 	Nauts[2].key_hit = "g"
+	
+	-- Camera
+	camera = Camera:new()
 end
 
 function love.update (dt)
 	-- Put world in motion!
 	world:update(dt)
+	camera:moveFollow()
 	-- Players
 	for k,naut in pairs(Nauts) do
 		naut:update(dt)
@@ -73,14 +78,15 @@ function love.draw ()
 	love.graphics.setColor(179, 82, 80, 255)
 	love.graphics.rectangle("fill", 0, 160, love.graphics.getWidth(), 40)
 	
+	local offset_x, offset_y = camera:getOffsets()
 	-- Draw ground
 	for k,platform in pairs(Platforms) do
-		platform:draw(0, 0, debug)
+		platform:draw(offset_x, offset_y, debug)
 	end
 	
 	-- Draw player
 	for k,naut in pairs(Nauts) do
-		naut:draw(0, 0, debug)
+		naut:draw(offset_x, offset_y, debug)
 	end
 end
 
diff --git a/player.lua b/player.lua
index 4d6f7ec..958ea8a 100644
--- a/player.lua
+++ b/player.lua
@@ -192,7 +192,7 @@ function Player:draw (offset_x, offset_y, debug)
 	local debug = debug or false
 	-- sprite draw
 	love.graphics.setColor(255,255,255,255)
-	love.graphics.draw(self.sprite, self.current[self.frame], self.body:getX(), self.body:getY(), self.rotate, self.facing, 1, 12, 15)
+	love.graphics.draw(self.sprite, self.current[self.frame], self.body:getX()+offset_x, self.body:getY()+offset_y, self.rotate, self.facing, 1, 12, 15)
 	-- debug draw
 	if debug then
 		love.graphics.setColor(50, 255, 50, 100)
-- 
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