_UPRINTWIDTH
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The _UPRINTWIDTH function returns the width in pixels of the text string specified. The function supports Unicode encoded text.
Syntax
- pixelWidth& = _UPRINTWIDTH(text$[, utfEncoding&][, fontHandle&])
Parameters
- text$ is any literal or variable STRING value.
- utfEncoding& is an optional UTF encoding of text$. This can be 0 for ASCII, 8 for UTF-8, 16 for UTF-16 or 32 for UTF-32.
- fontHandle& is an optional font handle.
Description
- If the utfEncoding& is omitted, then it is assumed to be 0 (ASCII).
- If fontHandle& is omitted, then the current write page font is used.
- All multi-byte UTF encodings are expected in little-endian.
- Unicode byte order mark (BOM) is not processed and must be handled by user code.
- This can be useful to find the width of the font print string before actually printing it.
- Can be used with variable-width fonts or built-in fonts, unlike _FONTWIDTH which requires a MONOSPACE font handle.
- Unlike _PRINTWIDTH, _UPRINTWIDTH always returns the width of the text string in pixels.
Availability
Examples
- Example
- Centers and prints a Russian text on a graphics screen.
OPTION _EXPLICIT SCREEN _NEWIMAGE(800, 600, 32) DIM fh AS LONG: fh = _LOADFONT("cyberbit.ttf", 21) IF fh <= 0 THEN PRINT "Failed to load font file!" END END IF _FONT fh RESTORE text_data DIM myString AS STRING: myString = LoadUData$ _UPRINTSTRING (_WIDTH \ 2 - _UPRINTWIDTH(myString, 8, fh) \ 2, _HEIGHT \ 2 - _UFONTHEIGHT \ 2), myString, _WIDTH, 8 END text_data: DATA 6F,D0,91,D1,8B,D1,81,D1,82,D1,80,D0,B0,D1,8F,20,D0,BA,D0,BE,D1,80,D0,B8,D1 DATA 87,D0,BD,D0,B5,D0,B2,D0,B0,D1,8F,20,D0,BB,D0,B8,D1,81,D0,B0,20,D0,BF,D0,B5 DATA D1,80,D0,B5,D0,BF,D1,80,D1,8B,D0,B3,D0,B8,D0,B2,D0,B0,D0,B5,D1,82,20,D1,87 DATA D0,B5,D1,80,D0,B5,D0,B7,20,D0,BB,D0,B5,D0,BD,D0,B8,D0,B2,D1,83,D1,8E,20,D1 DATA 81,D0,BE,D0,B1,D0,B0,D0,BA,D1,83,2E FUNCTION LoadUData$ DIM AS _UNSIGNED LONG i, s DIM d AS STRING DIM buffer AS STRING READ d s = VAL("&h" + d) buffer = SPACE$(s) FOR i = 1 TO s READ d ASC(buffer, i) = VAL("&h" + d) NEXT LoadUData = buffer END FUNCTION |
See also
- Featured in our "Keyword of the Day" series
- _UFONTHEIGHT, _ULINESPACING, _UPRINTSTRING, _UCHARPOS
- _FONTWIDTH, _FONTHEIGHT, _PRINTWIDTH
- _NEWIMAGE, _LOADFONT
- _PRINTSTRING, _FONT
- Text Using Graphics