Camera.lua

-- simple Camera class
-- taken from https://gist.github.com/BlackBulletIV/961685, written by BlackBulletIV 
local class = require 'lib.middleclass'

local Camera = class('Camera')
function Camera:initialize()
	self._x = 0
	self._y = 0
	self.scaleX = 1
	self.scaleY = 1
	self.rotation = 0
end

function Camera:set()
	love.graphics.push()
	love.graphics.rotate(-self.rotation)
	love.graphics.scale(1 / self.scaleX, 1 / self.scaleY)
	love.graphics.translate(-self._x, -self._y)
end

function Camera:unset()
	love.graphics.pop()
end

function Camera:move(dx, dy)
	self._x = self._x + (dx or 0)
	self._y = self._y + (dy or 0)
end

function Camera:rotate(dr)
	self.rotation = self.rotation + dr
end

function Camera:scale(sx, sy)
	sx = sx or 1
	self.scaleX = self.scaleX * sx
	self.scaleY = self.scaleY * (sy or sx)
end

function Camera:setX(value)
	if self._bounds then
		self._x = clamp(value, self._bounds.x1, self._bounds.x2)
	else
		self._x = value
	end
end

function Camera:setY(value)
	if self._bounds then
		self._y = clamp(value, self._bounds.y1, self._bounds.y2)
	else
		self._y = value
	end
end

function Camera:setPosition(x, y)
	if x then self:setX(x) end
	if y then self:setY(y) end
end

function Camera:setScale(sx, sy)
	self.scaleX = sx or self.scaleX
	self.scaleY = sy or self.scaleY
end

function Camera:getBounds()
	return unpack(self._bounds)
end

function Camera:setBounds(x1, y1, x2, y2)
	self._bounds = { x1 = x1, y1 = y1, x2 = x2, y2 = y2 }
end

return Camera