LÖVE

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math.atan2(M.y - B.y, M.x - B.x)

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--set barrel image
barrelImage = love.graphics.newImage("barrel.png")

--set some basic variables for barrel
barrelDirection = 0
barrelX = 200
barelY = 200
--Remember: images rotate around their origin point
--Since the default origin point is (0,0), that means that the image
--would rotate around it's upper-left corner, meaning that it will
--move around in a big circle as it rotates.
--If you set the origin point to the center of the image (image's width/2, image's height/2)
--then the image won't appear to orbit around as it rotates.
--This also means that you'll have to adjust the x and y position you set accordingly
--e.g. if the barrel's x origin is 16 and it's x is 100, then the image will be actually
--be displayed at x position 84 (100 - 16 = 84). So take this into account when
--you set the barrel's position.
barrelOriginX = barrelImage:getWidth()/2
barrelOriginY = barrelImage:getHeight()/2


function love.update()
	--use the handy "find rotation" function that I added to the bottom of this code
	barrelDirection = findRotation(barrelX,barrelY,love.mouse.getX(),love.mouse.getY())
end

function love.draw()
	--draw the barrel
	--see https://love2d.org/wiki/love.graphics.draw for info on the love.graphics.draw()
	--function's arguments
	love.graphics.draw(barrelImage,barrelX,barrelY,barrelDirection,1,1,barrelOriginX,barrelOriginY)
end

--basic "find rotation" math function
function findRotation(x1,y1,x2,y2)
	return math.atan2(y2 - y1, x2 - x1)
end

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 Math.atan2 (m.y - B.y, m.x - B.x) [/ code]

the gun is not pointed at the sight

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function man.load()
	man = love.graphics.newImage("sprite/Char.png")
	manx = 0
	many = 0
	manxvel = 10
	manyvel = 10
	findRotation = math.atan2(mY - many, mX - manx)
	mandirection = findRotation(manx,many,love.mouse.getX(),love.mouse.getY())
	manOriginX = man:getWidth()/2
	manOriginY = man:getHeight()/2
	local mX, mY = love.mouse.getPosition()
end

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function love.update(dt)
	findRotation = math.atan2(mouseY - many, mX - manx)
	man.update()
	mouseY = love.mouse.getY()
end