I'm trying to draw underlined strings, but they come out wrong when
the font is bold. So I made a sample app from the Cocoa template, and
added a custom view to the main window. The code is below. But the
output doesn't underline correctly. What am I doing wrong?
NSTextStorage* getTextStorage() {
if( !s_textStorage ){
s_textStorage = [[NSTextStorage alloc] init];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
NSTextContainer *textContainer = [[NSTextContainer alloc] init];
[layoutManager addTextContainer:textContainer];
[textContainer release];
[s_textStorage addLayoutManager:layoutManager];
[layoutManager release];
}
return s_textStorage;
}
- (void)drawRect:(NSRect)rect {
int fontSize = 41;
NSFontManager* fontManager = [NSFontManager sharedFontManager];
NSFont* boldFont = [fontManager fontWithFamily:@"Arial" traits:0
weight:5 size:fontSize];
// boldFont = [fontManager convertFont:font
toHaveTrait:NSBoldFontMask];
NSMutableDictionary* attr = [NSMutableDictionary
dictionaryWithObject:font forKey:NSFontAttributeName];
[attr setObject:[NSNumber numberWithInt:NSSingleUnderlineStyle]
forKey:NSUnderlineStyleAttributeName];
NSAttributedString* attrString = [[NSAttributedString alloc]
initWithString:@"Sample Text" attributes:attr];
NSTextStorage* textStorage = getTextStorage();
[textStorage setAttributedString:attrString];
NSLayoutManager *layoutManager = (NSLayoutManager *)[[textStorage
layoutManagers] objectAtIndex:0];
NSTextContainer *textContainer = (NSTextContainer *)
[[layoutManager textContainers] objectAtIndex:0];
NSPoint point = NSMakePoint( 10, 10);
NSRange glyphRange = [layoutManager
glyphRangeForTextContainer:textContainer];
[[textContainer layoutManager] drawGlyphsForGlyphRange:
glyphRange atPoint:point ];
}
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