topic [SOLVED] String length to pixel length? Like STW() in GDL in GDL

[SOLVED] String length to pixel length? Like STW() in GDL

Erenford — Tue, 23 May 2023 14:38:18 GMT

Hello,
Is there a DG function that computes for the length of the string in pixels? Something equivalent of STW(string) in GDL.
I'm trying to make a button that have a width according to its text. I could base it on the widest char like 'W' but it would be too wide for something like char 'i'.

Thanks.

Re: String length to pixel length? Like STW() in GDL

Tibor Lorantfy — Fri, 05 Dec 2014 09:11:14 GMT

Hi Erenford,

You should use APIAny_GetTextLineLengthID goodie function for this.
Example code:

double	DetermineTextWidth (const char* str, short font, double size) 
{ 
	if (strlen (str) == 0) 
		return (0); 
 
	API_TextLinePars	tlp; 
	double				width = 0.0; 
 
	BNZeroMemory (&tlp, sizeof (API_TextLinePars)); 
	tlp.drvScaleCorr = true;	// Apply drawing scale... 
	tlp.index = 0;				// Get the length of the longest line (there may be only one line...) 
	tlp.lineStr = const_cast<char*> (str); 
	tlp.wFace = APIFace_Plain; 
	tlp.wFont = font; 
	tlp.wSize = size; 
	tlp.wSlant = PI / 2.0;		// Plain text 
	ACAPI_Goodies (APIAny_GetTextLineLengthID, &tlp, &width); 
	return (width); 
}

Regards,
Tibor

Re: String length to pixel length? Like STW() in GDL

Erenford — Mon, 08 Dec 2014 06:20:27 GMT

oooh so there is one!

So for dialog box with default settings, I'm guessing no drawing style, with size 12. I'm not sure what the default font is so I just set 'wFont' to 1.

Seems it's working fine!
Thanks Tibor.