Testo della curva sul cerchio esistente

Per un’applicazione che sto costruendo ho disegnato 2 cerchi. Uno un po ‘più grande dell’altro. Voglio curvare il testo tra quelle linee, per un menu circolare che sto costruendo.

Leggo la maggior parte delle cose sulla curvatura di un testo che devi dividere il testo in caratteri e disegnare ciascun carattere su di esso con la giusta angolazione in mente (ruotando il contesto su cui stai disegnando).

Non riesco proprio a capire come ottenere gli angoli e le posizioni giuste per i miei personaggi.

Ho incluso uno screenshot su ciò che il menu, al momento, assomiglia. Solo i testi aggiunti sono caricati da un’immagine in UIImageView.

alt text

Spero che qualcuno possa darmi dei punti di partenza su come posso disegnare il testo nel cerchio bianco, in alcuni punti.

EDIT: Ok, sono attualmente a questo punto:

alt text

Compire utilizzando il seguente codice:

- (UIImage*) createMenuRingWithFrame:(CGRect)frame { CGRect imageSize = CGRectMake(0,0,300,300); float perSectionDegrees = 360 / [sections count]; float totalRotation = 90; char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding]; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, imageSize.size.width, imageSize.size.height, 8, 4 * imageSize.size.width, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextSetTextMatrix(context, CGAffineTransformIdentity); CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman); CGContextSetRGBFillColor(context, 0, 0, 0, 1); CGPoint centerPoint = CGPointMake(imageSize.size.width / 2, imageSize.size.height / 2); double radius = (frame.size.width / 2); CGContextStrokeEllipseInRect(context, CGRectMake(centerPoint.x - (frame.size.width / 2), centerPoint.y - (frame.size.height / 2), frame.size.width, frame.size.height)); for (int index = 0; index < [sections count]; index++) { NSString* menuItemText = [sections objectAtIndex:index]; CGSize textSize = [menuItemText sizeWithFont:self.menuItemsFont]; char* menuItemTextChar = (char*)[menuItemText cStringUsingEncoding:NSASCIIStringEncoding]; float x = centerPoint.x + radius * cos(degreesToRadians(totalRotation)); float y = centerPoint.y + radius * sin(degreesToRadians(totalRotation)); CGContextSaveGState(context); CGContextTranslateCTM(context, x, y); CGContextRotateCTM(context, degreesToRadians(totalRotation - 90)); CGContextShowTextAtPoint(context, 0 - (textSize.width / 2), 0 - (textSize.height / 2), menuItemTextChar, strlen(menuItemTextChar)); CGContextRestoreGState(context); totalRotation += perSectionDegrees; } CGImageRef contextImage = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:contextImage]; } 

Queste sono le variabili che uso qui:

 NSArray* sections = [[NSArray alloc] initWithObjects:@"settings", @"test", @"stats", @"nog iets", @"woei", @"woei2", nil]; self.menuItemsFont = [UIFont fontWithName:@"VAGRounded-Bold" size:18]; 

La rotazione delle parole sembra corretta, anche il posizionamento. Ora ho bisogno di capire in qualche modo a quale rotazione dovrebbero essere le lettere (e le loro coordinate). Potrei usare un po ‘di aiuto in questo.

Modifica: risolto! Dai un’occhiata al seguente codice!

 - (void) drawStringAtContext:(CGContextRef) context string:(NSString*) text atAngle:(float) angle withRadius:(float) radius { CGSize textSize = [text sizeWithFont:self.menuItemsFont]; float perimeter = 2 * M_PI * radius; float textAngle = textSize.width / perimeter * 2 * M_PI; angle += textAngle / 2; for (int index = 0; index < [text length]; index++) { NSRange range = {index, 1}; NSString* letter = [text substringWithRange:range]; char* c = (char*)[letter cStringUsingEncoding:NSASCIIStringEncoding]; CGSize charSize = [letter sizeWithFont:self.menuItemsFont]; NSLog(@"Char %@ with size: %fx %f", letter, charSize.width, charSize.height); float x = radius * cos(angle); float y = radius * sin(angle); float letterAngle = (charSize.width / perimeter * -2 * M_PI); CGContextSaveGState(context); CGContextTranslateCTM(context, x, y); CGContextRotateCTM(context, (angle - 0.5 * M_PI)); CGContextShowTextAtPoint(context, 0, 0, c, strlen(c)); CGContextRestoreGState(context); angle += letterAngle; } } - (UIImage*) createMenuRingWithFrame:(CGRect)frame { CGPoint centerPoint = CGPointMake(frame.size.width / 2, frame.size.height / 2); char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding]; CGFloat* ringColorComponents = (float*)CGColorGetComponents(ringColor.CGColor); CGFloat* textColorComponents = (float*)CGColorGetComponents(textColor.CGColor); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, frame.size.width, frame.size.height, 8, 4 * frame.size.width, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextSetTextMatrix(context, CGAffineTransformIdentity); CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman); CGContextSetRGBStrokeColor(context, ringColorComponents[0], ringColorComponents[1], ringColorComponents[2], ringAlpha); CGContextSetLineWidth(context, ringWidth); CGContextStrokeEllipseInRect(context, CGRectMake(ringWidth, ringWidth, frame.size.width - (ringWidth * 2), frame.size.height - (ringWidth * 2))); CGContextSetRGBFillColor(context, textColorComponents[0], textColorComponents[1], textColorComponents[2], textAlpha); CGContextSaveGState(context); CGContextTranslateCTM(context, centerPoint.x, centerPoint.y); float angleStep = 2 * M_PI / [sections count]; float angle = degreesToRadians(90); textRadius = textRadius - 12; for (NSString* text in sections) { [self drawStringAtContext:context string:text atAngle:angle withRadius:textRadius]; angle -= angleStep; } CGContextRestoreGState(context); CGImageRef contextImage = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); [self saveImage:[UIImage imageWithCGImage:contextImage] withName:@"test.png"]; return [UIImage imageWithCGImage:contextImage]; } 

Ho provato a lavorarlo rapidamente su carta, quindi potrei sbagliarmi 🙂

Convertire la lunghezza della stringa in unità su UnitCircle . Quindi (string.lenght / cerchio perimetro) * 2Pi. Ora hai l’angolo in radianti per l’intera stringa. (Questo è l’angolo tra inizio e fine della stringa)

Per le lettere separate puoi fare lo stesso per ottenere l’angolo (in radianti) per le singole lettere (usando le larghezze delle lettere)

Una volta che hai l’angolo in radianti puoi calcolare la posizione x e y (e la rotazione) delle lettere.

Bonus: per una spaziatura uniforms è anche ansible calcolare il rapporto tra la lunghezza totale di tutte le stringhe e l’intero perimetro. E dividi lo spazio rimanente equamente tra la stringa.

Aggiornamento Ho fatto una dimostrazione del concetto usando html5 / canvas, quindi guardalo con un browser decente 🙂 Dovresti essere in grado di portarlo. (attenzione, il codice non è commentato)
wtf: il codice funziona correttamente con la console di debug di Chrome aperta e fallisce quando viene chiuso. (soluzione: open chrome console: ctrl-shift-j e ricarica la pagina: f5); FF3.6.8 sembra funzionare bene, ma le lettere “ballano”.

Ho adattato il progetto di esempio di Apple CoreTextArcCocoa (menzionato da Tom H in questa risposta ) e ho pensato di condividerlo qui.

Ho aggiunto anche alcune altre funzionalità, come la possibilità di impostare la dimensione dell’arco su qualcosa di più piccolo di 180, e il colore e l’offset del testo si spostano come proprietà (in modo da non dover avere un frame enorme per mostrare l’intero testo).

  /* File: CoreTextArcView.m (iOS version) Abstract: Defines and implements the CoreTextArcView custom UIView subclass to draw text on a curve and illustrate best practices with CoreText. Based on CoreTextArcView provided by Apple for Mac OS X https://developer.apple.com/library/mac/#samplecode/CoreTextArcCocoa/Introduction/Intro.html Ported to iOS (& added color, arcsize features) August 2011 by Alec Vance, Juggleware LLC http://juggleware.com/ */ #import  #import  @interface CoreTextArcView : UIView { @private UIFont * _font; NSString * _string; CGFloat _radius; UIColor * _color; CGFloat _arcSize; CGFloat _shiftH, _shiftV; // horiz & vertical shift struct { unsigned int showsGlyphBounds:1; unsigned int showsLineMetrics:1; unsigned int dimsSubstitutedGlyphs:1; unsigned int reserved:29; } _flags; } @property(retain, nonatomic) UIFont *font; @property(retain, nonatomic) NSString *text; @property(readonly, nonatomic) NSAttributedString *attributedString; @property(assign, nonatomic) CGFloat radius; @property(nonatomic) BOOL showsGlyphBounds; @property(nonatomic) BOOL showsLineMetrics; @property(nonatomic) BOOL dimsSubstitutedGlyphs; @property(retain, nonatomic) UIColor *color; @property(nonatomic) CGFloat arcSize; @property(nonatomic) CGFloat shiftH, shiftV; @end /* File: CoreTextArcView.m (iOS version) */ #import "CoreTextArcView.h" #import  #import  #define ARCVIEW_DEBUG_MODE NO #define ARCVIEW_DEFAULT_FONT_NAME @"Helvetica" #define ARCVIEW_DEFAULT_FONT_SIZE 64.0 #define ARCVIEW_DEFAULT_RADIUS 150.0 #define ARCVIEW_DEFAULT_ARC_SIZE 180.0 @implementation CoreTextArcView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.font = [UIFont fontWithName:ARCVIEW_DEFAULT_FONT_NAME size:ARCVIEW_DEFAULT_FONT_SIZE]; self.text = @"Curvaceous Type"; self.radius = ARCVIEW_DEFAULT_RADIUS; self.showsGlyphBounds = NO; self.showsLineMetrics = NO; self.dimsSubstitutedGlyphs = NO; self.color = [UIColor whiteColor]; self.arcSize = ARCVIEW_DEFAULT_ARC_SIZE; self.shiftH = self.shiftV = 0.0f; } return self; } typedef struct GlyphArcInfo { CGFloat width; CGFloat angle; // in radians } GlyphArcInfo; static void PrepareGlyphArcInfo(CTLineRef line, CFIndex glyphCount, GlyphArcInfo *glyphArcInfo, CGFloat arcSizeRad) { NSArray *runArray = (NSArray *)CTLineGetGlyphRuns(line); // Examine each run in the line, updating glyphOffset to track how far along the run is in terms of glyphCount. CFIndex glyphOffset = 0; for (id run in runArray) { CFIndex runGlyphCount = CTRunGetGlyphCount((CTRunRef)run); // Ask for the width of each glyph in turn. CFIndex runGlyphIndex = 0; for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) { glyphArcInfo[runGlyphIndex + glyphOffset].width = CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), NULL, NULL, NULL); } glyphOffset += runGlyphCount; } double lineLength = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CGFloat prevHalfWidth = glyphArcInfo[0].width / 2.0; glyphArcInfo[0].angle = (prevHalfWidth / lineLength) * arcSizeRad; // Divide the arc into slices such that each one covers the distance from one glyph's center to the next. CFIndex lineGlyphIndex = 1; for (; lineGlyphIndex < glyphCount; lineGlyphIndex++) { CGFloat halfWidth = glyphArcInfo[lineGlyphIndex].width / 2.0; CGFloat prevCenterToCenter = prevHalfWidth + halfWidth; glyphArcInfo[lineGlyphIndex].angle = (prevCenterToCenter / lineLength) * arcSizeRad; prevHalfWidth = halfWidth; } } // ensure that redraw occurs. -(void)setText:(NSString *)text{ [_string release]; _string = [text retain]; [self setNeedsDisplay]; } //set arc size in degrees (180 = half circle) -(void)setArcSize:(CGFloat)degrees{ _arcSize = degrees * M_PI/180.0; } //get arc size in degrees -(CGFloat)arcSize{ return _arcSize * 180.0/M_PI; } - (void)drawRect:(CGRect)rect { // Don't draw if we don't have a font or string if (self.font == NULL || self.text == NULL) return; // Initialize the text matrix to a known value CGContextRef context = UIGraphicsGetCurrentContext(); //Reset the transformation //Doing this means you have to reset the contentScaleFactor to 1.0 CGAffineTransform t0 = CGContextGetCTM(context); CGFloat xScaleFactor = t0.a > 0 ? t0.a : -t0.a; CGFloat yScaleFactor = t0.d > 0 ? t0.d : -t0.d; t0 = CGAffineTransformInvert(t0); if (xScaleFactor != 1.0 || yScaleFactor != 1.0) t0 = CGAffineTransformScale(t0, xScaleFactor, yScaleFactor); CGContextConcatCTM(context, t0); CGContextSetTextMatrix(context, CGAffineTransformIdentity); if(ARCVIEW_DEBUG_MODE){ // Draw a black background (debug) CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor); CGContextFillRect(context, self.layer.bounds); } NSAttributedString *attStr = self.attributedString; CFAttributedStringRef asr = (CFAttributedStringRef)attStr; CTLineRef line = CTLineCreateWithAttributedString(asr); assert(line != NULL); CFIndex glyphCount = CTLineGetGlyphCount(line); if (glyphCount == 0) { CFRelease(line); return; } GlyphArcInfo * glyphArcInfo = (GlyphArcInfo*)calloc(glyphCount, sizeof(GlyphArcInfo)); PrepareGlyphArcInfo(line, glyphCount, glyphArcInfo, _arcSize); // Move the origin from the lower left of the view nearer to its center. CGContextSaveGState(context); CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV - self.radius / 2.0); if(ARCVIEW_DEBUG_MODE){ // Stroke the arc in red for verification. CGContextBeginPath(context); CGContextAddArc(context, 0.0, 0.0, self.radius, M_PI_2+_arcSize/2.0, M_PI_2-_arcSize/2.0, 1); CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0); CGContextStrokePath(context); } // Rotate the context 90 degrees counterclockwise (per 180 degrees) CGContextRotateCTM(context, _arcSize/2.0); // Now for the actual drawing. The angle offset for each glyph relative to the previous glyph has already been calculated; with that information in hand, draw those glyphs overstruck and centered over one another, making sure to rotate the context after each glyph so the glyphs are spread along a semicircular path. CGPoint textPosition = CGPointMake(0.0, self.radius); CGContextSetTextPosition(context, textPosition.x, textPosition.y); CFArrayRef runArray = CTLineGetGlyphRuns(line); CFIndex runCount = CFArrayGetCount(runArray); CFIndex glyphOffset = 0; CFIndex runIndex = 0; for (; runIndex < runCount; runIndex++) { CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex); CFIndex runGlyphCount = CTRunGetGlyphCount(run); Boolean drawSubstitutedGlyphsManually = false; CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName); // Determine if we need to draw substituted glyphs manually. Do so if the runFont is not the same as the overall font. if (self.dimsSubstitutedGlyphs && ![self.font isEqual:(UIFont *)runFont]) { drawSubstitutedGlyphsManually = true; } CFIndex runGlyphIndex = 0; for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) { CFRange glyphRange = CFRangeMake(runGlyphIndex, 1); CGContextRotateCTM(context, -(glyphArcInfo[runGlyphIndex + glyphOffset].angle)); // Center this glyph by moving left by half its width. CGFloat glyphWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width; CGFloat halfGlyphWidth = glyphWidth / 2.0; CGPoint positionForThisGlyph = CGPointMake(textPosition.x - halfGlyphWidth, textPosition.y); // Glyphs are positioned relative to the text position for the line, so offset text position leftwards by this glyph's width in preparation for the next glyph. textPosition.x -= glyphWidth; CGAffineTransform textMatrix = CTRunGetTextMatrix(run); textMatrix.tx = positionForThisGlyph.x; textMatrix.ty = positionForThisGlyph.y; CGContextSetTextMatrix(context, textMatrix); if (!drawSubstitutedGlyphsManually) { CTRunDraw(run, context, glyphRange); } else { // We need to draw the glyphs manually in this case because we are effectively applying a graphics operation by setting the context fill color. Normally we would use kCTForegroundColorAttributeName, but this does not apply as we don't know the ranges for the colors in advance, and we wanted demonstrate how to manually draw. CGFontRef cgFont = CTFontCopyGraphicsFont(runFont, NULL); CGGlyph glyph; CGPoint position; CTRunGetGlyphs(run, glyphRange, &glyph); CTRunGetPositions(run, glyphRange, &position); CGContextSetFont(context, cgFont); CGContextSetFontSize(context, CTFontGetSize(runFont)); CGContextSetRGBFillColor(context, 0.25, 0.25, 0.25, 0.5); CGContextShowGlyphsAtPositions(context, &glyph, &position, 1); CFRelease(cgFont); } // Draw the glyph bounds if ((self.showsGlyphBounds) != 0) { CGRect glyphBounds = CTRunGetImageBounds(run, context, glyphRange); CGContextSetRGBStrokeColor(context, 0.0, 0.0, 1.0, 1.0); CGContextStrokeRect(context, glyphBounds); } // Draw the bounding boxes defined by the line metrics if ((self.showsLineMetrics) != 0) { CGRect lineMetrics; CGFloat ascent, descent; CTRunGetTypographicBounds(run, glyphRange, &ascent, &descent, NULL); // The glyph is centered around the y-axis lineMetrics.origin.x = -halfGlyphWidth; lineMetrics.origin.y = positionForThisGlyph.y - descent; lineMetrics.size.width = glyphWidth; lineMetrics.size.height = ascent + descent; CGContextSetRGBStrokeColor(context, 0.0, 1.0, 0.0, 1.0); CGContextStrokeRect(context, lineMetrics); } } glyphOffset += runGlyphCount; } CGContextRestoreGState(context); free(glyphArcInfo); CFRelease(line); } -(void)dealloc { [_font release]; [_string release]; [_color release]; [super dealloc] } @synthesize font = _font; @synthesize text = _string; @synthesize radius = _radius; @synthesize color = _color; @synthesize arcSize = _arcSize; @synthesize shiftH = _shiftH; @synthesize shiftV = _shiftV; @dynamic attributedString; - (NSAttributedString *)attributedString { // Create an attributed string with the current font and string. assert(self.font != nil); assert(self.text != nil); // Create our attributes... // font CTFontRef fontRef = CTFontCreateWithName((CFStringRef)self.font.fontName, self.font.pointSize, NULL); // color CGColorRef colorRef = self.color.CGColor; // pack it into attributes dictionary NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys: (id)fontRef, (id)kCTFontAttributeName, colorRef, (id)kCTForegroundColorAttributeName, nil]; assert(attributesDict != nil); // Create the attributed string NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:self.text attributes:attributesDict]; CFRelease(fontRef); return [attrString autorelease]; } @dynamic showsGlyphBounds; - (BOOL)showsGlyphBounds { return _flags.showsGlyphBounds; } - (void)setShowsGlyphBounds:(BOOL)show { _flags.showsGlyphBounds = show ? 1 : 0; } @dynamic showsLineMetrics; - (BOOL)showsLineMetrics { return _flags.showsLineMetrics; } - (void)setShowsLineMetrics:(BOOL)show { _flags.showsLineMetrics = show ? 1 : 0; } @dynamic dimsSubstitutedGlyphs; - (BOOL)dimsSubstitutedGlyphs { return _flags.dimsSubstitutedGlyphs; } - (void)setDimsSubstitutedGlyphs:(BOOL)dim { _flags.dimsSubstitutedGlyphs = dim ? 1 : 0; } @end 

Per farti risparmiare tempo, ecco cosa ho trovato per il CoreTextArcView che espone

 - (id)initWithFrame:(CGRect)frame font:(UIFont *)font text:(NSString *)text radius:(float)radius arcSize:(float)arcSize color:(UIColor *)color; 
  (x, y) <--------------- w --------------->
       + ------------------------------------------------- - +
      ^ |  |  <-
      ||  |  telaio
      ||  |
      ||  VED LA BEL |
      ||  CU R HE |
      ||  xx RE x |
       |  xx xxx |
       |  xxx xx x xxx |
     h |  xxx xx xxx xx |
       |  x xxx <-----------------------------
       |  xx xx xxxxxxx xx x |  arcSize:
      ||  xx xxx xxx xx |  angolo di apertura
      ||  x xxx xx x |  in gradi
      ||  xx xx xxx x |
      ||  x <---- r -----> xx |
      ||  x (xc, yc) x |
      ||  x <-----------------------
      ||  x xx |  xc = x + w / 2
      v + --- xx xx -------------------------------------- ----- + yc = y + h / 2 + r / 2
            xx xx
             x xx
             xxx xx
               xxx xxx
                 xxxx xxxx
                    xxxxx xxxxx
                         xxxxxxxxxxxxxxx 

questo è valido per r> 0 e arcsize> 0.

Dai un’occhiata a questo esempio di progetto Apple: CoreTextArcCocoa

Dimostra che usa il Core Text per disegnare il testo lungo un arco in un’applicazione Cocoa. Inoltre, questo esempio illustra come utilizzare il pannello dei caratteri di Cocoa per ricevere le impostazioni dei caratteri che possono essere utilizzate da Core Text per selezionare il carattere utilizzato per il disegno.

CoreText è disponibile anche in iOS, quindi dovresti essere in grado di implementare qualcosa di simile.

Ho provato il progetto git menzionato sopra e, come ha detto ZpaceZombor , c’è un offset sbagliato

 CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV - self.radius / 2.0); 

Sono cambiato semplicemente a

 CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV); 

Ho impostato il raggio sul valore Min tra larghezza e altezza della vista contenitore, quindi ho impostato la dimensione dell’arco su .

Ho arbitrariamente cambiato la linea

 CGContextRotateCTM(context, _arcSize/2.0); 

con

 CGContextRotateCTM(context, M_PI_2); 

Ho cambiato il metodo init in

 - (id)initWithFrame:(CGRect)frame font:(UIFont *)font text:(NSString *)text color:(UIColor *)color{ self = [super initWithFrame:frame]; if (self) { self.font = font; self.text = text; self.radius = -1 * (frame.size.width > frame.size.height ? frame.size.height / 2 : frame.size.width / 2); _arcSize = 2* M_PI; self.showsGlyphBounds = NO; self.showsLineMetrics = NO; self.dimsSubstitutedGlyphs = NO; self.color = color; self.shiftH = self.shiftV = 0.0f; } return self; } 

Dopo molti tentativi, ho apportato questa modifica alla funzione PrepareGlyphArcInfo

 // this constants come from a single case ( fontSize = 22 | circle diameter = 250px | lower circle diameter 50px | 0.12f is a proportional acceptable value of 250px diameter | 0.18f is a proportional acceptable value of 50px | 0.035f is a proportional acceptable value of "big" chars #define kReferredCharSpacing 0.12f #define kReferredFontSize 22.f #define kReferredMajorDiameter 250.f #define kReferredMinorDiameter 50.f #define kReferredMinorSpacingFix 0.18f #define kReferredBigCharSpacingFix 0.035f static void PrepareGlyphArcInfo(UIFont* font,CGFloat containerRadius,CTLineRef line, CFIndex glyphCount, GlyphArcInfo *glyphArcInfo, CGFloat arcSizeRad) { NSArray *runArray = (NSArray *)CTLineGetGlyphRuns(line); CGFloat curMaxTypoWidth = 0.f; CGFloat curMinTypoWidth = 0.f; // Examine each run in the line, updating glyphOffset to track how far along the run is in terms of glyphCount. CFIndex glyphOffset = 0; for (id run in runArray) { CFIndex runGlyphCount = CTRunGetGlyphCount((CTRunRef)run); // Ask for the width of each glyph in turn. CFIndex runGlyphIndex = 0; for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) { glyphArcInfo[runGlyphIndex + glyphOffset].width = CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), NULL, NULL, NULL); if (curMaxTypoWidth < glyphArcInfo[runGlyphIndex + glyphOffset].width) curMaxTypoWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width; if (curMinTypoWidth > glyphArcInfo[runGlyphIndex + glyphOffset].width || curMinTypoWidth == 0) curMinTypoWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width; } glyphOffset += runGlyphCount; } //double lineLength = CTLineGetTypographicBounds(line, NULL, NULL, NULL); glyphArcInfo[0].angle = M_PI_2; // start at the bottom circle CFIndex lineGlyphIndex = 1; // based on font size. (supposing that with fontSize = 22 we could use 0.12) CGFloat maxCharSpacing = font.pointSize * kReferredCharSpacing / kReferredFontSize; // for diameter minor than referred 250 if ((fabsf(containerRadius)*2) < kReferredMajorDiameter) maxCharSpacing = maxCharSpacing + kReferredMinorSpacingFix * kReferredMinorDiameter / (fabsf(containerRadius)*2); CGFloat startAngle = fabsf(glyphArcInfo[0].angle); CGFloat endAngle = startAngle; for (; lineGlyphIndex < glyphCount; lineGlyphIndex++) { CGFloat deltaWidth = curMaxTypoWidth - glyphArcInfo[lineGlyphIndex].width; // fix applied to large characters like uppercase letters or symbols CGFloat bigCharFix = (glyphArcInfo[lineGlyphIndex-1].width == curMaxTypoWidth || (glyphArcInfo[lineGlyphIndex-1].width+2) >= curMaxTypoWidth ? kReferredBigCharSpacingFix : 0 ); glyphArcInfo[lineGlyphIndex].angle = - (maxCharSpacing * (glyphArcInfo[lineGlyphIndex].width + deltaWidth ) / curMaxTypoWidth) - bigCharFix; endAngle += fabsf(glyphArcInfo[lineGlyphIndex].angle); } // center text to bottom glyphArcInfo[0].angle = glyphArcInfo[0].angle + (endAngle - startAngle ) / 2; } 

E ha cambiato il drawRect: metodo a

 - (void)drawRect:(CGRect)rect { // Don't draw if we don't have a font or string if (self.font == NULL || self.text == NULL) return; // Initialize the text matrix to a known value CGContextRef context = UIGraphicsGetCurrentContext(); //Reset the transformation //Doing this means you have to reset the contentScaleFactor to 1.0 CGAffineTransform t0 = CGContextGetCTM(context); CGFloat xScaleFactor = t0.a > 0 ? t0.a : -t0.a; CGFloat yScaleFactor = t0.d > 0 ? t0.d : -t0.d; t0 = CGAffineTransformInvert(t0); if (xScaleFactor != 1.0 || yScaleFactor != 1.0) t0 = CGAffineTransformScale(t0, xScaleFactor, yScaleFactor); CGContextConcatCTM(context, t0); CGContextSetTextMatrix(context, CGAffineTransformIdentity); NSAttributedString *attStr = self.attributedString; CFAttributedStringRef asr = (CFAttributedStringRef)attStr; CTLineRef line = CTLineCreateWithAttributedString(asr); assert(line != NULL); CFIndex glyphCount = CTLineGetGlyphCount(line); if (glyphCount == 0) { CFRelease(line); return; } GlyphArcInfo * glyphArcInfo = (GlyphArcInfo*)calloc(glyphCount, sizeof(GlyphArcInfo)); PrepareGlyphArcInfo(self.font, self.radius, line, glyphCount, glyphArcInfo, _arcSize); // Move the origin from the lower left of the view nearer to its center. CGContextSaveGState(context); CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV); if(ARCVIEW_DEBUG_MODE){ // Stroke the arc in red for verification. CGContextBeginPath(context); CGContextAddArc(context, 0.0, 0.0, self.radius, M_PI_2+_arcSize/2.0, M_PI_2-_arcSize/2.0, 1); CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0); CGContextStrokePath(context); } // Rotate the context 90 degrees counterclockwise (per 180 degrees) CGContextRotateCTM(context, M_PI_2); // Now for the actual drawing. The angle offset for each glyph relative to the previous glyph has already been calculated; with that information in hand, draw those glyphs overstruck and centered over one another, making sure to rotate the context after each glyph so the glyphs are spread along a semicircular path. CGPoint textPosition = CGPointMake(0.0, self.radius); CGContextSetTextPosition(context, textPosition.x, textPosition.y); CFArrayRef runArray = CTLineGetGlyphRuns(line); CFIndex runCount = CFArrayGetCount(runArray); CFIndex glyphOffset = 0; CFIndex runIndex = 0; for (; runIndex < runCount; runIndex++) { CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex); CFIndex runGlyphCount = CTRunGetGlyphCount(run); Boolean drawSubstitutedGlyphsManually = false; CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName); // Determine if we need to draw substituted glyphs manually. Do so if the runFont is not the same as the overall font. if (self.dimsSubstitutedGlyphs && ![self.font isEqual:(UIFont *)runFont]) { drawSubstitutedGlyphsManually = true; } CFIndex runGlyphIndex = 0; for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) { CFRange glyphRange = CFRangeMake(runGlyphIndex, 1); CGContextRotateCTM(context, -(glyphArcInfo[runGlyphIndex + glyphOffset].angle)); // Center this glyph by moving left by half its width. CGFloat glyphWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width; CGFloat halfGlyphWidth = glyphWidth / 2.0; CGPoint positionForThisGlyph = CGPointMake(textPosition.x - halfGlyphWidth, textPosition.y); // Glyphs are positioned relative to the text position for the line, so offset text position leftwards by this glyph's width in preparation for the next glyph. textPosition.x -= glyphWidth; CGAffineTransform textMatrix = CTRunGetTextMatrix(run); textMatrix.tx = positionForThisGlyph.x; textMatrix.ty = positionForThisGlyph.y; CGContextSetTextMatrix(context, textMatrix); CTRunDraw(run, context, glyphRange); } glyphOffset += runGlyphCount; } CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor); CGContextSetAlpha(context,0.0); CGContextFillRect(context, rect); CGContextRestoreGState(context); free(glyphArcInfo); CFRelease(line); } 

Come puoi vedere, ho usato un metodo davvero non buono per calcolare lo spazio tra ogni carattere (nell'esempio originale lo spazio tra i caratteri si basa anche sulla dimensione dell'arco). Ad ogni modo questo sembra funzionare quasi bene.

La soluzione migliore potrebbe essere quella di curvare un rettangolo (quindi il testo lineare), con uno sforzo grafico e calcoli meno strani.

Questo è quello che ho ottenuto risultato del campione

Spero che sia d'aiuto

Questo è il mio metodo per disegnare stringhe attribuite curve su livelli, con un angolo predefinito (in radianti):

 [self drawCurvedStringOnLayer:self.layer withAttributedText:incident atAngle:angle withRadius:300]; 

La stringa viene inoltre automaticamente invertita nella parte inferiore dell’arco.

inserisci la descrizione dell'immagine qui

 - (void)drawCurvedStringOnLayer:(CALayer *)layer withAttributedText:(NSAttributedString *)text atAngle:(float)angle withRadius:(float)radius { // angle in radians CGSize textSize = CGRectIntegral([text boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX) options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) context:nil]).size; float perimeter = 2 * M_PI * radius; float textAngle = (textSize.width / perimeter * 2 * M_PI); float textRotation; float textDirection; if (angle > degreesToRadians(10) && angle < degreesToRadians(170)) { //bottom string textRotation = 0.5 * M_PI ; textDirection = - 2 * M_PI; angle += textAngle / 2; } else { //top string textRotation = 1.5 * M_PI ; textDirection = 2 * M_PI; angle -= textAngle / 2; } for (int c = 0; c < text.length; c++) { NSRange range = {c, 1}; NSAttributedString* letter = [text attributedSubstringFromRange:range]; CGSize charSize = CGRectIntegral([letter boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX) options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) context:nil]).size; float letterAngle = ( (charSize.width / perimeter) * textDirection ); float x = radius * cos(angle + (letterAngle/2)); float y = radius * sin(angle + (letterAngle/2)); CATextLayer *singleChar = [self drawTextOnLayer:layer withText:letter frame:CGRectMake(layer.frame.size.width/2 - charSize.width/2 + x, layer.frame.size.height/2 - charSize.height/2 + y, charSize.width, charSize.height) bgColor:nil opacity:1]; singleChar.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation(angle - textRotation) ); angle += letterAngle; } } - (CATextLayer *)drawTextOnLayer:(CALayer *)layer withText:(NSAttributedString *)text frame:(CGRect)frame bgColor:(UIColor *)bgColor opacity:(float)opacity { CATextLayer *textLayer = [[CATextLayer alloc] init]; [textLayer setFrame:frame]; [textLayer setString:text]; [textLayer setAlignmentMode:kCAAlignmentCenter]; [textLayer setBackgroundColor:bgColor.CGColor]; [textLayer setContentsScale:[UIScreen mainScreen].scale]; [textLayer setOpacity:opacity]; [layer addSublayer:textLayer]; return textLayer; } /** Degrees to Radian **/ #define degreesToRadians(degrees) (( degrees ) / 180.0 * M_PI ) /** Radians to Degrees **/ #define radiansToDegrees(radians) (( radians ) * ( 180.0 / M_PI ) ) 

La soluzione di Juggleware funziona alla grande, ma non riesco a trovare un modo per cambiare la direzione, cioè come andrei a spostare l’arco da in senso orario a antiorario?

Update : After struggling for days with the overcomplicated code in that example, I decided to roll my own. I went for a declarative approach using CATextLayers which are placed on the circle and rotated individually. This way the results were much more simple to achieve. Here’s the core code for you:

 -(void)layoutSublayersOfLayer:(CALayer*)layer { if ( layer != self.layer ) { return; } self.layer.sublayers = nil; LOG( @"Laying out sublayers..." ); CGFloat xcenter = self.frame.size.width / 2; CGFloat ycenter = self.frame.size.height / 2; float angle = arcStart; float angleStep = arcSize / [self.text length]; for ( NSUInteger i = 0; i < [self.text length]; ++i ) { NSRange range = { .location = i, .length = 1 }; NSString* c = [self.text substringWithRange:range]; CGFloat yoffset = sin( DEGREES_TO_RADIANS(angle) ) * radius; CGFloat xoffset = cos( DEGREES_TO_RADIANS(angle) ) * radius; CGFloat rotAngle = 90 - angle; if ( clockwise ) { yoffset = -yoffset; rotAngle = -90 + angle; } CATextLayer* tl = [[CATextLayer alloc] init]; if ( debugMode ) { tl.borderWidth = 1; tl.cornerRadius = 3; tl.borderColor = [UIColor whiteColor].CGColor; } tl.frame = CGRectMake( shiftH + xcenter - xoffset, shiftV + ycenter + yoffset, 20, 20 ); tl.font = self.font.fontName; tl.fontSize = self.font.pointSize; tl.foregroundColor = self.color.CGColor; tl.string = c; tl.alignmentMode = @"center"; tl.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation( DEGREES_TO_RADIANS(rotAngle) ) ); if ( debugMode ) { CATextLayer* debugLayer = [self debugLayerWithText:[NSString stringWithFormat:@"%u: %.0f°", i, angle]]; debugLayer.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation( DEGREES_TO_RADIANS(-rotAngle) ) ); [tl addSublayer:debugLayer]; } [self.layer addSublayer:tl]; angle += angleStep; } } 

You can download a sample project that use CoreTextArcView: https://github.com/javenisme/CurvaView

Take the circumference of the inner circle. This is the circle you want the base of the characters to be rendered onto. We’ll call this circumference totalLength .

I assume you have a list of strings to render around the circle in textItems .

Take the width of each string into a textWidths array and distribute them evenly across totalLength , perhaps like this pseudo(pythonish) code:

 block = max(textWidths) assert(block * len(textWidths) <= totalLength) offsets = [(block * i) + ((block-width) / 2) for i, width in enumerate(textWidths)] 

Although better layouts can no doubt be done in the cases where the assert would trigger, all that really matters is that we know where individual words start and end in a known area. To render on a straight line of length totalLength we simply start rendering each block of text at offsets[i] .

To get it onto the circle, we'll map that straight line back onto the circumference. To do that we need to map each pixel along that line onto a position on the circle and an angle. This function converts the offset along that line into an angle (it takes values in the range 0 to totalLength )

 def offsetToAngle(pixel): ratio = pixel / totalLength angle = math.pi * 2 * ratio # cool kids use radians. return angle 

that's your angle. To get a position:

 def angleToPosition(angle, characterWidth): xNorm = math.sin(angle + circleRotation) yNorm = math.cos(angle + circleRotation) halfCWidth = characterWidth / 2 x = xNorm * radius + yNorm * halfCWidth # +y = tangent y = yNorm * radius - xNorm * halfCWidth # -x = tangent again. # translate to the circle centre x += circleCentre.x y += circleCentre.y return x,y 

That's a bit more tricky. This is pretty much the crux of your issues, I'd have thought. The big deal is that you need to offset back along the tangent of the circle to work out the point to start rendering so that the middle of the character hits the radius of the circle. What constitues 'back' depends on your coordinate system. if 0,0 is in the bottom left, then the signs of the tangent components is swapped. I assumed top left.

This is important: I'm also making a big assumption that the text rotation occurs around the bottom left of the glyph. If it doesn't then things will look a bit weird. It will be more noticeable at larger font sizes. There is always a way to compensate for wherever it rotates around, and there's usually a way to tell the system where you want the rotation origin to be (that will be related to the CGContextTranslateCTM call in your code I'd imagine) you'll need to do a small experiment to get characters drawing at a single point rotating around their bottom left.

circleRotation is just an offset so you can rotate the whole circle, rather than having things always be in the same orientation. That's in radians too.

so now for each character in each block of text:

 for text, offset in zip(textItems, offsets): pix = offset # start each block at the offset we calculated earlier. for c in text: cWidth = measureGlyph(c) # choose the circumference location of the middle of the character # this is to match with the tangent calculation of tangentToOffset angle = offsetToAngle(pix + cWidth / 2) x,y = angleToPosition(angle, cWidth) drawGlyph(c, x, y, angle) pix += cWidth # start of next character in circumference space 

That's the concept, anyway.

Referring to Ali Seyman ‘s answer :

You can download a sample project that use CoreTextArcView: https://github.com/javenisme/CurvaView

Add on this method to reduce the view frame size, just like UILabel.

 - (void)sizeToFit{ [super sizeToFit]; CGFloat width = ceilf( fabsf((self.radius*2)) + self.font.lineHeight) + 3.0; CGRect f = self.frame; f.size = CGSizeMake(width,width); self.frame = f; [self setNeedsDisplay]; } 

If anyone could improve on reducing the height as well, welcome to add on.

inserisci la descrizione dell'immagine qui

 #import  @interface CircleTextCell : NSCell { } @end #import "CircleTextCell.h" #define PI (3.141592653589793) @implementation CircleTextCell - (void)drawWithFrame: (NSRect)cellFrame inView: (NSView*)controlView { NSAttributedString *str = [self attributedStringValue]; NSSize stringSize = [str size]; NSUInteger chars = [[str string] length]; CGFloat radius = (stringSize.width + 5 * chars) / (2 * PI); CGFloat diameter = 2*radius; NSPoint scale = {1,1}; if (diameter > cellFrame.size.width) { scale.x = cellFrame.size.width / diameter; } if (diameter > cellFrame.size.height) { scale.y = cellFrame.size.height / diameter; } NSAffineTransform *transform = [NSAffineTransform transform]; NSAffineTransformStruct identity = [transform transformStruct]; [transform scaleXBy: scale.x yBy: scale.y]; [transform translateXBy: radius yBy: 0]; [NSGraphicsContext saveGraphicsState]; [transform concat]; NSPoint origin = {0,0}; CGFloat angleScale = 360 / (stringSize.width + (5 * chars)); for (NSUInteger i=0 ; i @class CircleTextCell; @interface CircleTextView : NSView { CircleTextCell *cell; } @end #import "CircleTextView.h" #import "CircleTextCell.h" @implementation CircleTextView - (void)awakeFromNib { NSDictionary *attributes = [NSDictionary dictionaryWithObject: [NSFont fontWithName: @"Zapfino" size:32] forKey: NSFontAttributeName]; NSAttributedString *str = [[NSAttributedString alloc] initWithString: @"Hello World! This is a very long text string that will be wrapped into a circle by a cell drawn in a custom view" attributes: attributes]; cell = [[CircleTextCell alloc] init]; [cell setAttributedStringValue: str]; } - (void)drawRect:(NSRect)rect { [[NSColor whiteColor] setFill]; [NSBezierPath fillRect: rect]; [cell drawWithFrame: [self bounds] inView: self]; } @end 

inserisci la descrizione dell'immagine qui that is the best url https://github.com/javenisme/CurvaView to set curve your text:

But as per the the degree wise curve i just update a code little bit and we can set the curve as a degree wise . like 45,60,90 180, 360.

Look at the code : https://github.com/tikamsingh/CurveTextWithAngle

You can take some idea.