I made a multiline, word-wrapped, center align-able CCLabelBMFont if anyone is interested. https://github.com/pingpongboss/CCLabelBMFontMultiline
//
// CCLabelBMFontMultiline.h
//
// Created by Mark Wei on 6/14/11.
//
#import <Foundation/Foundation.h>
#import "cocos2d.h"
typedef enum {CenterAlignment, LeftAlignment} CCLabelBMFontMultilineAlignment;
@interface CCLabelBMFontMultiline : CCNode <CCLabelProtocol> {
CCLabelBMFont *label_;
CGSize dimension_;
CCLabelBMFontMultilineAlignment alignment_;
NSString *fntFile_;
}
@property (retain) CCLabelBMFont *label;
@property (assign) CGSize dimension;
@property (assign) CCLabelBMFontMultilineAlignment alignment;
@property (retain) NSString *fntFile;
- (id)initWithString:(NSString *)string fntFile:(NSString *)font dimensions:(CGSize)size alignment:(CCLabelBMFontMultilineAlignment)alignment;
+ (CCLabelBMFontMultiline *)labelWithString:(NSString *)string fntFile:(NSString *)font dimensions:(CGSize)size alignment:(CCLabelBMFontMultilineAlignment)alignment;
-(void) setString:(NSString*)label;
/** returns the string that is rendered */
-(NSString*) string;
@end
//
// CCLabelBMFontMultiline.m
//
// Created by Mark Wei on 6/14/11.
//
#import "CCLabelBMFontMultiline.h"
@interface CCLabelBMFontMultiline(Private)
- (void)updateLabel;
@end
@implementation CCLabelBMFontMultiline
@synthesize label = label_;
@synthesize dimension = dimension_;
@synthesize alignment = alignment_;
@synthesize fntFile = fntFile_;
#pragma mark -
#pragma mark Lifecycle Methods
- (id)initWithString:(NSString *)string fntFile:(NSString *)font dimensions:(CGSize)size alignment:(CCLabelBMFontMultilineAlignment)alignment {
self = [super init];
if (self) {
self.dimension = size;
self.alignment = alignment;
self.fntFile = font;
self.contentSize = size;
self.anchorPoint = ccp(0.5f, 0.5f);
self.label = [CCLabelBMFont labelWithString:string fntFile:font];
[self updateLabel];
}
return self;
}
+ (CCLabelBMFontMultiline *)labelWithString:(NSString *)string fntFile:(NSString *)font dimensions:(CGSize)size alignment:(CCLabelBMFontMultilineAlignment)alignment {
return [[[CCLabelBMFontMultiline alloc] initWithString:string fntFile:font dimensions:size alignment:alignment] autorelease];
}
- (void)dealloc {
self.label = nil;
self.fntFile = nil;
[super dealloc];
}
#pragma mark -
- (void)updateLabel {
//Step 1: Make multiline
NSString *multilineString = @"", *lastWord = @"";
int line = 1, i = 0, offset = 0, stringLength = [[label_ string] length];
//Go through each character and insert line breaks as necessary
for (CCSprite *characterSprite in self.label.children) {
if (i >= stringLength || i < 0)
break;
unichar character = [[self.label string] characterAtIndex:i];
//Character is a line break
//Put lastWord on the current line and start a new line
//Reset lastWord
if ([[NSCharacterSet newlineCharacterSet] characterIsMember:character]) {
lastWord = [[lastWord stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] stringByAppendingFormat:@"%C", character];
multilineString = [multilineString stringByAppendingString:lastWord];
lastWord = @"";
line++;
i++;
//CCLabelBMFont do not have a character for new lines, so do NOT "continue;" in the for loop. Process the next character
if (i >= stringLength || i < 0)
break;
character = [[self.label string] characterAtIndex:i];
}
//Character is a whitespace
//Put lastWord on current line and continue on current line
//Reset lastWord
if ([[NSCharacterSet whitespaceCharacterSet] characterIsMember:character]) {
lastWord = [lastWord stringByAppendingFormat:@"%C", character];
multilineString = [multilineString stringByAppendingString:lastWord];
lastWord = @"";
i++;
continue;
}
//Character is out of bounds
//Do not put lastWord on current line. Add "\n" to current line to start a new line
//Append to lastWord
if (characterSprite.position.x + characterSprite.contentSize.width/2 - offset > line * self.dimension.width) {
lastWord = [lastWord stringByAppendingFormat:@"%C", character];
NSString *trimmedString = [multilineString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
multilineString = [trimmedString stringByAppendingString:@"\n"];
offset += [lastWord length];
line++;
i++;
continue;
} else {
//Character is normal
//Append to lastWord
lastWord = [lastWord stringByAppendingFormat:@"%C", character];
i++;
continue;
}
}
multilineString = [multilineString stringByAppendingFormat:@"%@", lastWord];
[self removeChild:self.label cleanup:YES];
self.label = [CCLabelBMFont labelWithString:multilineString fntFile:self.fntFile];
[self addChild:self.label];
//Step 2: Make alignment
switch (self.alignment) {
case CenterAlignment:
i = 0;
int lineNumber = 0;
//Go through line by line
for (NSString *lineString in [multilineString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]]) {
int lineWidth = 0;
//Find index of last character in this line
int index = i + [lineString length] - 1;
if (index < 0 || index >= [self.label.children count])
continue;
//Find position of last character on the line
CCSprite *lastChar = [self.label.children objectAtIndex:index];
lineWidth = lastChar.position.x + lastChar.contentSize.width/2;
//Figure out how much to shift each character in this line horizontally
float shift = self.label.contentSize.width/2 - lineWidth/2;
if (shift != 0) {
int j = 0;
//For each character, shift it so that the line is center aligned
for (j = 0; j < [lineString length]; j++) {
index = i + j;
if (index < 0 || index >= [self.label.children count])
continue;
CCSprite *characterSprite = [self.label.children objectAtIndex:index];
characterSprite.position = ccpAdd(characterSprite.position, ccp(shift, 0));
}
}
i += [lineString length];
lineNumber++;
}
break;
case LeftAlignment:
default:
break;
}
self.contentSize = self.label.contentSize;
self.label.position = ccp(self.contentSize.width/2, self.contentSize.height/2);
}
//Draw the bounding box of this CCLabelBMFontMultiline for troubleshooting
/*
- (void)draw {
glLineWidth(5);
glColor4f(0, 0, 0, 255);
ccDrawLine(ccp(0,0), ccp(0, self.contentSize.height));
ccDrawLine(ccp(0,0), ccp(self.contentSize.width, 0));
ccDrawLine(ccp(self.contentSize.width, 0), ccp(self.contentSize.width, self.contentSize.height));
ccDrawLine(ccp(0, self.contentSize.height), ccp(self.contentSize.width, self.contentSize.height));
ccDrawLine(ccp(0,0), ccp(self.contentSize.width, self.contentSize.height));
ccDrawLine(ccp(0, self.contentSize.height), ccp(self.contentSize.width, 0));
}
*/
#pragma mark -
#pragma mark <CCLabelProtocol> Methods
- (void)setString:(NSString*)label {
[self.label setString:label];
[self updateLabel];
}
/** returns the string that is rendered */
-(NSString*)string {
return [self.label string];
}
@end
