love.graphics.translate, how to use?

[vadim2]

Maybe someone can give an example of a function, I do like this:

Code: Select all

if love.keyboard.isDown("up") then
love.graphics.translate(0,0.2)
end

But it does not work.

[walesmd]

All translate does it alter future drawing operations. Easier to explain in code:

Code: Select all

function love.draw()
  local x = 10
  local y = 10

  love.graphics.point(x, y) -- This point is drawn at 10, 10
  love.graphics.translate(20, 20)

  love.graphics.point(x, y) -- This point is drawn at 30, 30 thanks to translation. We didn't change the x, y variables.
end

[vrld]

You need to do this in your love.draw() function. So you probably want to do something like this:

Code: Select all

local ty = 0
function love.draw()
    love.graphics.translate(0,ty)
    ... other draw stuff ...
end

function love.update(dt)
    if love.keyboard.isDown('up') then 
        ty = ty +  0.2 -- this is framerate dependent! use ty = ty + 10 * dt to make it move 10 pixels per second
    end
    ... other update stuff ...
end

[vadim2]

Tnx all!