Mouse Y is off after Translation

[yetneverdone]

Hi, in my love.draw() function, I have:

Code: Select all

love.graphics.push()
love.graphics.translate(0,width/2) -- to center the game view
love.graphics.scale(ratio,ratio)
love.graphics.pop()

and in my love.update(dt) function:

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local mx = love.mouse.getX()/ratio
local my = love.mouse.getY()ratio
--ps can I do
local mx,my = love.mouse.getPosition()/ratio? I just thought about it this instant

The problem is, without the translate function, it works, but after using the translate function, the mouse(specifically the Y) is off. How would I correct the mouse coordinates? Thanks alot

[Positive07]

You subtract the offset first. Graphics translations are not related to mouse coordinates.

You basically do the opposite operations so if you added an offset you subtract it, if you scaled up then you scale down

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local mx = (love.mouse.getX() - tx) / sx
local my = (love.mouse.getY() - ty) / sy

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love.draw = function ()
   love.graphics.push()
   love.graphics.translate(tx, ty)
   love.graphics.scale(sx, sy)
   love.graphics.pop()
end

[yetneverdone]

You subtract the offset first. Graphics translations are not related to mouse coordinates.

You basically do the opposite operations so if you added an offset you subtract it, if you scaled up then you scale down

Code: Select all

local mx = (love.mouse.getX() - tx) / sx
local my = (love.mouse.getY() - ty) / sy

Code: Select all

love.draw = function ()
   love.graphics.push()
   love.graphics.translate(tx, ty)
   love.graphics.scale(sx, sy)
   love.graphics.pop()
end

Thanks. Actually ive tried that before posting here, i rechecked again, it was that i test at the wrong function hahaha. Silly me. Thanks anyways