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GuruMeditation
Docs » Autodocs » graphics.library » TextFit

NAME

	TextFit - count characters that will fit in a given extent (V36)

SYNOPSIS

	chars = TextFit(rastport, string, strLen, textExtent,
D0 A1 A0 D0 A2
constrainingExtent, strDirection,
A3 D1
constrainingBitWidth, constrainingBitHeight)
D2 D3
ULONG TextFit(struct RastPort *, STRPTR, UWORD,
struct TextExtent *, struct TextExtent *, WORD, UWORD, UWORD);

FUNCTION

	This function determines how many of the characters of the
provided string will fit into the space described by the
constraining parameters. It also returns the extent of
that number of characters.

INPUTS

	rp     - a pointer to the RastPort which describes where the
text attributes reside.
string - the address of string to determine the constraint of
strLen - The number of characters in the string.
If zero, there are no characters in the string.
textExtent - a structure to hold the extent result.
constrainingExtent - the extent that the text must fit in.
This can be NULL, indicating only the constrainingBit
dimensions will describe the constraint.
strDirection - the offset to add to the string pointer to
get to the next character in the string. Usually 1.
Set to -1 and the string to the end of the string to
perform a TextFit() anchored at the end. No other value
is valid.
constrainingBitWidth - an alternative way to specify the
rendering box constraint width that is independent of
the rendering origin. Range 0..32767.
constrainingBitHeight - an alternative way to specify the
rendering box constraint height that is independent of
the rendering origin. Range 0..32767.

RESULT

	chars - the number of characters from the origin of the
given string that will fit in both the constraining
extent (which specifies a CP bound and a rendering
box relative to the origin) and in the rendering width
and height specified.

NOTES

	The result is zero chars and an empty textExtent when the fit
cannot be performed. This occurs not only when no text will
fit in the provided constraints, but also when:
- the RastPort rp's rp_TxSpacing sign and magnitude is so
great it reverses the path of the text.
- the constrainingExtent does not include x = 0.

BUGS

	Under V37, TextFit() would return one too few characters if the
font was proportional. This can be worked around by passing
(constrainingBitWidth + 1) for proportional fonts. This is fixed
for V39.

SEE ALSO

TextExtent(), TextLength(), Text(), <graphics/text.h>, <graphics/rastport.h>

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