Central-Defence/cannon.lua at master · drowne/Central-Defence · GitHub

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module (..., package.seeall)

local director 	 = require ("director")
local projectile = require("projectile")
local physics 	 = require( "physics" )
local globalLayer

local _H = display.contentHeight
local _W = display.contentWidth

local cannonInstance
local newAngle
local timerID
local canShoot = false
local delayToShoot = 300
local bulletLayer
local laserSound = audio.loadSound("laser.wav")

local canCreate = true

function removeAllProjectiles()

	for i=1, bulletLayer.numChildren do

		local child = bulletLayer[i]

		if child then

			if child.x < -200 or child.x > _W + 200 or child.y < 0 or child.y > _H then

				bulletLayer:remove(i)

			end

		end

	end

	bulletLayer:removeSelf()

	bulletLayer = display.newGroup()
	globalLayer:insert(bulletLayer)

end

function checkOutOfWindow(event)

	canCreate = false

	for i=1, bulletLayer.numChildren do

		local child = bulletLayer[i]

		if child then

			if child.x < -200 or child.x > _W + 200 or child.y < 0 or child.y > _H then

				bulletLayer:remove(i)

			end

		end

	end


	canCreate = true

end

function new()

	globalLayer = display.newGroup()


	bulletLayer = display.newGroup()
	globalLayer:insert(bulletLayer)

	cannonInstance = display.newImage("cannon.png", true)
	cannonInstance.name = "cannon"
	cannonInstance.x = _W/2
	cannonInstance.y = _H/2
	--cannonInstance:scale(0.5, 0.5)

	physics.addBody(cannonInstance, "kinematic", {density=0.1, friction=1.0, bounce=0.5, radius=50, isSensor=true});

	globalLayer:insert(cannonInstance)

	Runtime:addEventListener("enterFrame", checkOutOfWindow)

	return globalLayer
end

function shoot()

	canShoot = true
	timerID = timer.performWithDelay(delayToShoot, shoot)

	if canCreate then
		audio.play( laserSound )
		bulletLayer:insert(projectile.new(newAngle))
	end

end

function startShooting()

	if not canShoot then
		shoot()
	end

end

function stopShooting()

	if timerID then
		timer.cancel(timerID)
		timerID = nil
		canShoot = false
	end

end

function setRotation(_x, _y)

	local relativeX = cannonInstance.x - _x
	local relativeY = cannonInstance.y - _y


	-- fix for the left quadrant

	if(_x <= _W/2) then

		newAngle = math.deg( math.atan(relativeY/relativeX) + math.pi )

	else

		newAngle = math.deg( math.atan(relativeY/relativeX) )

	end

	cannonInstance.rotation = newAngle

end

function getRotation()
	 return cannonInstance.rotation
end