Resize font to match a specific width

totebo · November 2014

Hi guys,

I have a feeling there is no good way of doing this, but I'd like to resize a textfield to match a pixel width without the text becoming jagged.

One solution I've tries was to create a text field, check the width, increment the size, create a new text field, check the size, and so on until I had the perfect size. This works, but sometimes crashes the app because of "too many files open".

It would be good if there was an option to change the point size of a font without first reloading it. Is there a way of doing this?

Niclas

HubertRonald · November 2014

Hi @totebo,

Yes It's crashes because increase Lua Memory and Texture Memory.

-----------------------------------------------------
-- you can check the above with this piece of code
-----------------------------------------------------
local test
local size = 80 -- in this case
for i=1, 100 do
 test=TextField.new(TTFont.new("my_font.ttf", size),"Some text", true)
end

Well, a dirty and not computationally expensive solution (compared the above)

---------------------------------------------
--  another solution
---------------------------------------------
local spriteTxt = Sprite.new()
local size = 80 -- font
local widthWant = 120 -- or another than you prefer
 
local Txt = TextField.new(TTFont.new("my_font.ttf", size),"Some text", true)
local scaleTxt = widthWant/Txt:getWidth()
spriteTxt:setScale(scaleTxt)
spriteTxt:setPosition(posX,posY)

The above requiere a pool class for than memory doesn't increase

PoolText = Core.class(Sprite)
 
function PoolTxt:init()
    self.pool = {}
end
 
function PoolText:createObject(w, txt, size)
    local b
    --if there is anything in pool take it
    if #self.pool > 0 then
        -- "BECAREFUL !!!"
        b = table.remove(self.pool)  -- "size is always the same because TTFont can't be modify"
        b:getChildAt(1):setText(txt)  -- one child (or text per sprite)
        local scaleTxt = w/b:getChildAt(1):getWidth()
        b:setScale(scaleTxt)
    else --create new object
        b = Sprite.new()
        local Txt=TextField.new(TTFont.new("my_font.ttf", size), txt, true)
        local scaleTxt = w/Txt:getWidth()
        b:addChild(Txt)
        b:setScale(scaleTxt)
    end
    --return object
    return b
end
 
--instead of destroying object, put it back to pool
function PoolText:destroyObject(b)
    b:removeFromParent()
    table.insert(#self.pool, b)
end

I hope that this script can help you

totebo · November 2014

Thanks HubertRonald! Much appreciated.

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