I need to use Quartz to draw a single character - a check mark - in a graphics
context. I don't need anything elaborate, no typesetting etc, I just want to
draw a single checkmark.
However, Quartz seemingly makes the trivial very difficult. Why for example,
does this code not work? Specifically, it returns 0 from
CGFontGetGlyphWithGlyphName meaning that the glyph name is unknown. But I see
it right there in the 'Special Characters' palette. The alternative of use the
CGShowTextAtPoint is no use either, because it only support MacRoman or 'font
specific' encoding, neither of which apparently allow unicode, at least as far
as the API is presented. The check mark has a unicode value of 0x2713, so can't
be represented by a char.
The higher-level string drawing methods are not really appropriate here because
this is part of a -drawInContext: method of a custom CALayer. It also has to
work across iOS and Mac.
C'mon, this has got to be easy, hasn't it?
CGFontRef font = CGFontCreateWithFontName( CFSTR("Lucida Grande"));
CGContextSetFont( ctx, font );
CGContextSetFontSize( ctx, 16 );
CGGlyph cv = CGFontGetGlyphWithGlyphName( font, CFSTR("CHECK MARK"));
if( self.value > 0 )
{
CGAffineTransform tfm = CGAffineTransformMakeScale( 1.0, -1.0 );
CGContextSetTextMatrix( ctx, tfm );
CGContextShowGlyphsAtPoint( ctx, sr.origin.x + 2.0, sr.origin.y
+ sr.size.height, &cv, 1 );
}
CGFontRelease( font );
--Graham
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