PowerUp.lua

POWERUP_SPEED = 200
POWER_UP_COLOR = {0, 0, 1}
POWER_UP_TYPES = {"SPIRAL", "SEEK", "AIMBOT", "LASER"}

function PowerUp(x, y, velocity, pType)
	local powerUp = {}
	powerUp.update = powerUpUpdate
	powerUp.draw = powerUpDraw
	powerUp.x = x
	powerUp.y = y
	powerUp.velocity = velocity
	powerUp.color = {0, 0, 1}
	powerUp.radius = 10
	powerUp.birth = globalTimer
	powerUp.psystem = love.graphics.newParticleSystem(fireImage)
	powerUp.psystem:setParticleLifetime(2, 5) -- Particles live at least 2s and at most 5s.
	powerUp.psystem:setEmissionRate(10)
	powerUp.psystem:setSizeVariation(0)
	powerUp.psystem:setSizes(.5)
	powerUp.psystem:setLinearAcceleration(0, 0, 0, 0) -- Random movement in all directions.
	powerUp.psystem:setColors({1,1,1,1},{1,1,1,.5},{1,1,1,0})
	powerUp.psystem:setParticleLifetime(1)
	--powerUp.psystem:setLinearAcceleration(-powerUp.velocity.x, -powerUp.velocity.y, -powerUp.velocity.x, -powerUp.velocity.y) 
	powerUp.psystem:setSpeed(magnitude(powerUp.velocity), magnitude(powerUp.velocity))
	powerUp.psystem:setDirection(math.pi + math.atan2(powerUp.velocity.y, powerUp.velocity.x), math.atan2(powerUp.velocity.y, powerUp.velocity.x))
	powerUp.psystem:setRelativeRotation(true)
	powerUp.destroyed = false
	powerUp.type = pType or "SEEK"
	powerUp.image = seekPowerUpImage
	return powerUp
end

function powerUpUpdate(powerUp, dt)
	powerUp.x = powerUp.x + dt * powerUp.velocity.x
	powerUp.y = powerUp.y + dt * powerUp.velocity.y
	
	powerUp.psystem:update(dt)
end

function powerUpDraw(powerUp)
	--love.graphics.setColor(POWER_UP_COLOR)
	love.graphics.setColor(hsvToRgb(globalTimer+powerUp.birth,1,1))
	love.graphics.draw(powerUp.psystem, powerUp.x, powerUp.y)
	
	love.graphics.setColor(1,1,1,1)
	love.graphics.draw(powerUp.image, powerUp.x - powerUp.radius, powerUp.y - powerUp.radius, 0, powerUp.radius*2/powerUp.image:getWidth())	
	
end