Ccw: Created page with " NOTOC This function calculates the real pixel height of a given font. It does this by d..."

2012-11-16T22:39:27Z

Created page with "<pageclass class="#228B22" subcaption="Useful Function"></pageclass> <lowercasetitle/> __NOTOC__ This function calculates the real pixel height of a given font. It does this by d..."

New page

<pageclass class="#228B22" subcaption="Useful Function"></pageclass>
<lowercasetitle/>
__NOTOC__
This function calculates the real pixel height of a given font. It does this by drawing and measuring pixels. Therefore it is super accurate (and super slow). Only do this once per font!
<br /><br />

==Syntax==
<syntaxhighlight lang="lua">float dxGetRealFontHeight( element font )</syntaxhighlight>

===Required Arguments===
* '''font''': Either a custom [[DX font]] element or the name of a built-in dx font

===Returns===
Returns a float representing the pixel height from the top of the ascenders to the base of the descenders.

==Code==
<section name="Clientside Script" class="client" show="true">
<syntaxhighlight lang="lua">
function dxGetRealFontHeight(font)
local cap,base = measureGlyph(font, "S")
local median,decend = measureGlyph(font, "p")
local ascend,base2 = measureGlyph(font, "h")

local ascenderSize = median - ascend
local capsSize = median - cap
local xHeight = base - median
local decenderSize = decend - base

return math.max(capsSize,ascenderSize) + xHeight + decenderSize
end

function measureGlyph(font, character)
local rt = dxCreateRenderTarget(128,128)
dxSetRenderTarget(rt,true)
dxDrawText(character,0,0,0,0,tocolor(255,255,255),1,font)
dxSetRenderTarget()
local pixels = dxGetTexturePixels(rt)
local first,last = 127,0
for y=0,127 do
for x=0,127 do
local r = dxGetPixelColor( pixels,x,y )
if r > 0 then
first = math.min( first, y )
last = math.max( last, y )
break
end
end
if last > 0 and y > last+2 then break end
end
destroyElement(rt)
return first,last
end
</syntaxhighlight>
</section>

==Example==
<section name="Clientside Script" class="client" show="true">
<syntaxhighlight lang="lua">
-- TODO
</syntaxhighlight>
</section>

==See Also==
{{Useful_Functions}}

[[Category:Useful Functions]]

DxGetRealFontHeight - Revision history

Ccw: Created page with " __NOTOC__ This function calculates the real pixel height of a given font. It does this by d..."

Ccw: Created page with " NOTOC This function calculates the real pixel height of a given font. It does this by d..."