I get the bounding rect for all glyphs in my TextView subclass and display them.
Looks perfect: the boxes snugly fit the characters.
But when a line contains any Thai character (similar for Laos, Burma, Khmer)
then the boxes are strangly wide.
Why? Is there some good reason for this? Or am I doing something wrong?
Example: font = Thonburi 48pt. One line of "Wim" prints:
2011-09-13 12:01:36.072 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] 3 glyps - self {{0, 0}, {205, 231}}
2011-09-13 12:01:36.075 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] textContainer {205, 10000000}
2011-09-13 12:01:36.075 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[0] = 172 rect {{5, 0},
{45.450000000000003, 66}}
2011-09-13 12:01:36.077 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[1] = 190 rect {{50.450000000000003, 0},
{11.268749999999997, 66}}
2011-09-13 12:01:36.077 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[2] = 194 rect {{61.71875, 0},
{42.918746948242188, 66}}
but the line "Wimม" (last char is Thai character mo ma = U+0E21) prints:
2011-09-13 12:03:55.684 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] 4 glyps - self {{0, 0}, {205, 231}}
2011-09-13 12:03:55.685 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] textContainer {205, 10000000}
2011-09-13 12:03:55.686 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[0] = 172 rect {{-28,
-5.5250000000000057}, {99.318749999999994, 78.918750000000003}}
2011-09-13 12:03:55.687 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[1] = 190 rect {{17.450000000000003,
-5.5250000000000057}, {99.318749999999994, 78.918750000000003}}
2011-09-13 12:03:55.688 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[2] = 194 rect {{28.71875,
-5.5250000000000057}, {99.318749999999994, 78.918750000000003}}
2011-09-13 12:03:55.689 NSFontAttributeExplorer[5156:707] -[FontView
setFont:andString:] glyphs[3] = 61 rect {{71.637500000000003,
-5.5250000000000057}, {99.318750000000009, 78.918750000000003}}
Code fragment:
NSUInteger numberOfGlyphs = [ layoutManager numberOfGlyphs ];
#ifdef LOG_BOXES
NSLog(@"%s %lu glyps - self %@", __FUNCTION__, numberOfGlyphs,
NSStringFromRect([self bounds]) );
#endif
for( NSUInteger glyphIndex = 0; glyphIndex < numberOfGlyphs; )
{
NSRange effectiveGlyphRange;
NSTextContainer *container = [ layoutManager
textContainerForGlyphAtIndex: glyphIndex
effectiveRange:
&effectiveGlyphRange
];
#ifdef LOG_BOXES
NSLog(@"%s textContainer %@", __FUNCTION__,
NSStringFromSize([container containerSize]) );
#endif
NSUInteger max = NSMaxRange(effectiveGlyphRange);
NSRange sux; sux.length = 1;
for( NSUInteger i = effectiveGlyphRange.location; i < max; i++)
{
sux.location = i;
NSRect r = [ layoutManager boundingRectForGlyphRange:
sux inTextContainer: container ];
NSGlyph g = [ layoutManager glyphAtIndex: i ];
if ( g == NSControlGlyph )
{
#ifdef LOG_BOXES
NSLog(@"%s glyphs[%lu] = NSControlGlyph
rect %@", __FUNCTION__, i, NSStringFromRect(r) );
#endif
}
else if ( g == NSNullGlyph )
{
#ifdef LOG_BOXES
NSLog(@"%s glyphs[%lu] = NSNullGlyph
rect %@", __FUNCTION__, i, NSStringFromRect(r) );
#endif
}
else
{
#ifdef LOG_BOXES
NSLog(@"%s glyphs[%lu] = %4u
rect %@", __FUNCTION__, i, g, NSStringFromRect(r) );
#endif
};
};
glyphIndex = max;
};
Kind regards,
Gerriet.
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