Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On 30 March 2012 18:18, Jeff Schriebman j...@leapfrogproductions.com wrote: I need to display the upwards arrow character in a specific position in a view. The unicode equivalence is U+2B06 and in UTF-8 it is E2 AC 86. I can successfully display it in Xcode on the console using NSLog(@This is an up arrow character \u2B06); I have not found a way to use CGContextShowTextAtPoint to easily display such a character and the examples I have found using CGContextShowGlyphsAtPoint() seem to require me to use a font containing the upwards arrow glyph. Is there a generic all inclusive unicode font? What is the right approach to this issue? Suggestions are appreciated. I like CoreText's CTFontGetGlyphsForCharacters (10.5) CTFontDrawGlyphs (10.7!). If you can live with it not working on 10.6 then you're good. RF ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 9:18 AM, Jeff Schriebman wrote: I have not found a way to use CGContextShowTextAtPoint to easily display such a character and the examples I have found using CGContextShowGlyphsAtPoint() seem to require me to use a font containing the upwards arrow glyph. I'm not familiar with the CG-level text APIs. But unless they're very low-level indeed, as long as they take Unicode strings you should be able to use arbitrary characters, and the renderer will substitute glyphs from appropriate fonts as needed. —Jens smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 9:18 AM, Jeff Schriebman wrote: I need to display the upwards arrow character in a specific position in a view. The unicode equivalence is U+2B06 and in UTF-8 it is E2 AC 86. I can successfully display it in Xcode on the console using NSLog(@This is an up arrow character \u2B06); I have not found a way to use CGContextShowTextAtPoint to easily display such a character and the examples I have found using CGContextShowGlyphsAtPoint() seem to require me to use a font containing the upwards arrow glyph. Is there a generic all inclusive unicode font? What is the right approach to this issue? Suggestions are appreciated. Why not just use the string drawing methods that are added to NSString by AppKit or UIKit (based on which your using)? -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 9:31 AM, Jens Alfke wrote: On Mar 30, 2012, at 9:18 AM, Jeff Schriebman wrote: I have not found a way to use CGContextShowTextAtPoint to easily display such a character and the examples I have found using CGContextShowGlyphsAtPoint() seem to require me to use a font containing the upwards arrow glyph. I'm not familiar with the CG-level text APIs. But unless they're very low-level indeed, as long as they take Unicode strings you should be able to use arbitrary characters, and the renderer will substitute glyphs from appropriate fonts as needed. They are in fact very low-level indeed, so ignore them unless you're prepared to write your own Unicode layout engine on top of them. Use the string drawing APIs instead. Douglas Davidson ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
This is what I have figured out so far: According to the Quartz 2D programming guide Quartz 2D provides a limited, low-level interface for drawing text encoded in the MacRoman text encoding and for drawing glyphs which probably explains my problem with using CGContextShowTextAtPoint(). I don't need a layout engine because I only need to put a single glyph at a specific location. I can successfully print a glyph on my view using CGContextShowGlyphs() but as of yet I haven't figured a way to actually find the glyph for the unicode character U+2B06 / E2 AC 86. If I could find a font that has the character I need then I could put it all together. I know the font is available I just don't know how to find it. I'm not sure how to use the string drawing APIs to directly put a unicode UTF8 character onto a specific X,Y location given a CGContextRef. Thanks On Mar 30, 2012, at 9:44 AM, Douglas Davidson wrote: On Mar 30, 2012, at 9:31 AM, Jens Alfke wrote: On Mar 30, 2012, at 9:18 AM, Jeff Schriebman wrote: I have not found a way to use CGContextShowTextAtPoint to easily display such a character and the examples I have found using CGContextShowGlyphsAtPoint() seem to require me to use a font containing the upwards arrow glyph. I'm not familiar with the CG-level text APIs. But unless they're very low-level indeed, as long as they take Unicode strings you should be able to use arbitrary characters, and the renderer will substitute glyphs from appropriate fonts as needed. They are in fact very low-level indeed, so ignore them unless you're prepared to write your own Unicode layout engine on top of them. Use the string drawing APIs instead. Douglas Davidson Jeff ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 11:45 AM, Jeff Schriebman wrote: I'm not sure how to use the string drawing APIs to directly put a unicode UTF8 character onto a specific X,Y location given a CGContextRef. Both AppKit and UIKit have methods for making a CGContextRef current. Lookup the NSGraphicsContext class (AppKit) or the UIGraphics functions (UIKit) for this information. -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
Thanks David. My CGContextRef is the current context. I'm just unfamiliar with how to draw a unicode character into it when I don't know the font containing a specific unicode glyph. I'm doing this for OS X 10.7 which is all I need to support. Thanks. On Mar 30, 2012, at 11:56 AM, David Duncan wrote: On Mar 30, 2012, at 11:45 AM, Jeff Schriebman wrote: I'm not sure how to use the string drawing APIs to directly put a unicode UTF8 character onto a specific X,Y location given a CGContextRef. Both AppKit and UIKit have methods for making a CGContextRef current. Lookup the NSGraphicsContext class (AppKit) or the UIGraphics functions (UIKit) for this information. -- David Duncan Jeff Schriebman ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 12:19 PM, Jeff Schriebman wrote: Thanks David. My CGContextRef is the current context. I'm just unfamiliar with how to draw a unicode character into it when I don't know the font containing a specific unicode glyph. I'm doing this for OS X 10.7 which is all I need to support. So have you tried the previously mentioned NSString methods? Did you encounter an issue? -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
Still having problems. I've unsuccessfully tried drawAtPoint:withAttributes: but I'm not sure what the best way to accomplish what I need to do. I'm not too familiar with the NSString methods so any advice is appreciated. On Mar 30, 2012, at 12:47 PM, David Duncan wrote: On Mar 30, 2012, at 12:19 PM, Jeff Schriebman wrote: Thanks David. My CGContextRef is the current context. I'm just unfamiliar with how to draw a unicode character into it when I don't know the font containing a specific unicode glyph. I'm doing this for OS X 10.7 which is all I need to support. So have you tried the previously mentioned NSString methods? Did you encounter an issue? -- David Duncan Jeff Schriebman ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 1:21 PM, Jeff Schriebman wrote: Still having problems. I've unsuccessfully tried drawAtPoint:withAttributes: but I'm not sure what the best way to accomplish what I need to do. I'm not too familiar with the NSString methods so any advice is appreciated. What aspects of the documentation have confused you. What code have you tried? We can't hold your hand forever. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
The following code fragment properly displays an up arrow on my view. Thanks for everyone's patience and help. NSDictionary* fontAttrs = [NSDictionary dictionaryWithObjectsAndKeys: [NSColor redColor], NSForegroundColorAttributeName, [NSFont systemFontOfSize:10], NSFontAttributeName, nil]; NSString *upArrow = @\u2B06; [upArrow drawAtPoint:NSMakePoint(100,100) withAttributes:fontAttrs]; On Mar 30, 2012, at 12:47 PM, David Duncan wrote: On Mar 30, 2012, at 12:19 PM, Jeff Schriebman wrote: Thanks David. My CGContextRef is the current context. I'm just unfamiliar with how to draw a unicode character into it when I don't know the font containing a specific unicode glyph. I'm doing this for OS X 10.7 which is all I need to support. So have you tried the previously mentioned NSString methods? Did you encounter an issue? -- David Duncan Jeff Schriebman ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
On Mar 30, 2012, at 1:21 PM, Jeff Schriebman wrote: I've unsuccessfully tried drawAtPoint:withAttributes: but I'm not sure what the best way to accomplish what I need to do. I'm not too familiar with the NSString methods so any advice is appreciated. What was unsuccessful? Did you try it using an ASCII character instead to make sure it wasn't some issue with the glyph? You should be able to get some kind of results with a call as simple as [@X drawAtPoint: NSMakePoint(x,y) withAttributes: [NSDictionary dictionary]]; It'll probably be drawn in black 12pt Helvetica since those are the default text attributes. —Jens smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
did i miss something, I thought is - (void)drawAtPoint:(NSPoint)point not NSAttributedString not NSString. Cheers kevin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Displaying an arbitrary unicode character using CGContextShowTextAtPoint or CGContextShowGlyphsAtPoint
The final code ended up looking like this NSDictionary* fontAttrs = [NSDictionary dictionaryWithObjectsAndKeys: [NSColor redColor], NSForegroundColorAttributeName, [NSFont systemFontOfSize:12], NSFontAttributeName, nil]; NSString *upArrow = @\u2B06; CGContextSaveGState(ctx); [upArrow drawAtPoint:NSMakePoint(x, y) withAttributes:fontAttrs]; CGContextRestoreGState(ctx); CGContextSetTextMatrix(ctx, CGAffineTransformIdentity); I needed to save and restore the graphics state as well as reinitialize the text matrix since the ctx state is apparently changed by drawAtPoint:withAttributes:. On Mar 30, 2012, at 4:43 PM, Kevin Bracey wrote: did i miss something, I thought is - (void)drawAtPoint:(NSPoint)point not NSAttributedString not NSString. Cheers kevin Regards, Jeff Schriebman ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
