Re: What's wrong with this NSBezierPath/NSGlyph code??

[Fred Kiefer]

Hi Jonathon,

nothing is wrong with your code. It is NSBezierPath that is failing you. 
The method you are calling is basically empty, or rather calling an 
empty method itself. I already had a bit of a discussion with Alexander 
M. on a possible implementation a few weeks ago on this list. If both of 
us ever find the time to work on this, you will get a working solution 
at least for the art backend. Maybe someone will even extend it to the 
xgps backend for the XFt font handling, I don't see any way to get it 
working with standard X fonts.
If you keep on lobbying for this, we might hurry to get this done. At 
the moment I am still struggling to get GNUstep fully working on my new 
computer, but most of the work will be Alexanders anyway.

Alexander:
You suggested to implement this method by handing on the font, instead 
of packed glyphs only. If we do this, why don't we go the full length 
and make this a method on the GSFontInfo? Something like:
GSFontInfo -appendBezierPathWithGlyphs: (NSGlyph *)glyphs
        count: (int)count
        toBezierPath: (NSBezierPath *)path;

Cheers
Fred


jonathon wrote:
> Can someone tell me what is wrong here?
>
> This method is part of a class derived from NSView, and is called from
> drawRect.
>
> Everything else I am drawing works: lines, regular text, etc.  But I
> cannot get a glyph to show up after being appended to an
> NSBezierPath!!
>
> It draws a tiny line segment as a test, then draws a rectangle around
> where the glyph would go.  The rectangle comes out different sizes,
> depending on the font size I select.  But no glyph appears inside!!
>
> thanks,
> jonathon
>
> - (void) drawYLabels
> {
>   NSString *label = @"Y axis";
>   NSFont *f = [NSFont userFontOfSize: 64];
>
>   NSTextStorage *ts;
>   ts = [[NSTextStorage alloc] initWithString: label];
>
>   NSLayoutManager *lm = [[NSLayoutManager alloc] init];
>   [ts addLayoutManager: lm];
>
>   NSRange r;
>   r.location = 0;
>   r.length = [label length];
>
>   NSGlyph g[r.length];
>   unsigned l = [lm getGlyphs: g range: r];
>
>   [[NSColor greenColor] set];
>
>   // draw rectangle for first glyph
>   NSRect grect = [f boundingRectForGlyph: g[0]];
>   grect.origin.x = 100;
>   grect.origin.y = 100;
>   [[NSBezierPath bezierPathWithRect: grect] stroke];
>
>   // test line draw
>   NSBezierPath *bp = [NSBezierPath bezierPath];
>   [bp moveToPoint: NSMakePoint(80, 80)];
>   [bp lineToPoint: NSMakePoint(90, 90)];
>   [bp moveToPoint: NSMakePoint(100, 100)];
>   [bp appendBezierPathWithGlyphs: g count: l inFont: f];
>   [bp fill];
>
>   NSLog(@"path: %@\n", [bp description]);
>   NSLog(@"# chars: %d glyphs: %c\n", l, g[0]);
>   NSLog(@"font: %@\n", [f description]);
> }