Arabic Letters Alignment

mertocan · November 2016

Hi,

All arabic letters are in same position but It shows them in different places. How Can I align them?

Thanks.
Mert

n1cke · November 2016

@mertocan: try TextField.new(font, letter, sample) where sample is a string with highest and lowest character in your font e.g. "Fg" sample is often enough for English texts. Or do you need to put each letter right in the center?

mertocan · November 2016

Yes, I need to put letters right in the center. I will try sample suggestion.

mertocan · November 2016

Also, I am not able to write arabic words with system font.

this doesnt display anything. How Can I display it with system font? I tried to change language of device but it didnt work.

TextField.new(nil,"طحزوهدجبا")

n1cke · November 2016

@mertocan: built-in Gideros font has only ASCII characters. You need to add your own font for this, but Gideros cannot display arabic words properly because currently Gideros doesn't support placing chars from right to left. However, you can display any chars one by one and use bitmaps with prerendered arabic text.

This solution places a char right into the center of a cell:

-- parameters
local width, height = 150, 150
local font = TTFont.new("Charis SIL Bold.ttf", height)
local letter = "-"
 
-- background
local pixel = Pixel.new(0x00BBFF, 0.5, width, height)
stage:addChild(pixel)
 
-- letter
local text = TextField.new(font, letter)
local x, y, w, h = font:getBounds(letter)
text:setPosition(0.5 * (width - w) - x, 0.5 * (height - h) - y)
stage:addChild(text)

hgy29 · November 2016

Here is a lua adaptation of some C code I wrote years ago to display arabic text. It does ligatures and finally reverse unicode chars to simulate right to left writing. The result looks good but I don't know arabic so I can't tell if it is correct or not.

function arabicProcessing(text)
	local Achar={0x002,0x024,0x062,0x084,0x0C4,0x104,0x144,0x184,0x1C2,0x1E2,0x202,0x222,
                               0x244,0x284,0x2C4,0x304,0x344,0x384,0x3C4,0x404,0x440,0x440,0x440,0x440,0x440,0x440,
                               0x444,0x484,0x4C4,0x504,0x544,0x584,0x5C4,0x602,0x622,0x644}
	local last=0	
	local rtext=""
	for p, cur in utf8.codes(text) do 
		if ((last>=0x627) and (last<=0x64A)) then
			local A=Achar[last-0x626]
			local unibase=0xFE8D+(A>>4)
			local of=0 --0=iso,1=fin,2=ini,3=med
			if ((cur>=0x627) and (cur<=0x64A)) then
				of=2+state
			else
				of=state
			end
			state=1
			if (of>=(A&0xF)) then of=0 end
			of=of+unibase
			rtext=rtext..utf8.char(of)
		else
			if last>0 then
				rtext=rtext..utf8.char(last)
			end
		state=0
		end
		last=cur
	end
	if last>0 then
		rtext=rtext..utf8.char(last)
	end
	text=""
	for p, cur in utf8.codes(rtext) do 
		text=utf8.char(cur)..text
	end
	return text
end
 
 
 
local font=TTFont.new("DejaVuSans.ttf",20)
 
local text="ينتحر و اختفى عن الانظار ليكمل بقية حياته ..."
--text="TEST"
 
print(text)
text=arabicProcessing(text)
print(text)
 
local tf=TextField.new(font,text)
 
tf:setY(50)
stage:addChild(tf)

mertocan · November 2016

It seems like it is working. Thanks.

SinisterSoft · December 2017

Alter the last bit to this and it will sort out brackets...

<pre>	for p, cur in utf8.codes(rtext) do
		if cur==0x28 or cur==0x29 then cur=cur~1 end   -- this will swap brackets
		text=utf8.char(cur)..text
	end

To add things like square brackets and curly brackets just add their ascii codes to the check. This works by toggling the last bit of the ascii code to swap from one bracket type to the other.

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