Cocos2d: how to make a label to fit the Iphone screen width

July 15th, 2009 by Andrea Franz

In the iPhone game I’m working on I need to display a different label every time I start a new game level. Each one of these labels has a random string taken from an array of words, and each one of these strings has different size. So every time I create a new label I set the maximum font size and then I decrement it until the string size measures less than the iPhone screen. I do that using the sizeWithFont method of the NSString class:

- (int) calculateFontSizeForString:(NSString*)string fontName:(NSString*)usedFontName {
  int fontSize = 120; // it seems to be the biggest font we can use
  while (--fontSize > 0) {			
    CGSize size = [string sizeWithFont:[UIFont fontWithName:usedFontName size:fontSize]];
    if (size.width <= 480 && size.height <= 360)
      break;
  }				
 
  return fontSize;
}

And here a custom scene that you can use to test it:

MyScene.h

#import "cocos2d.h"
 
@interface MyScene : Scene {
  Label    *label;
  NSArray  *strings;
  NSString *fontName;
  int      stringIndex;
}
 
- (void) nextLabel;
- (int)  calculateFontSizeForString:(NSString*)string fontName:(NSString*)usedFontName;
- (void) removeCurrentLabel;
- (void) createNextLabel;
- (void) animateLabel;
 
@property (nonatomic, retain) NSArray  *strings;
@property (nonatomic, retain) NSString *fontName;
@end

MyScene.m

#import "MyScene.h"
 
@implementation MyScene
 
@synthesize strings;
@synthesize fontName;
 
- (id) init {
  if (self = [super init]) {
    [self setFontName:@"Marker Felt"];
    [self setStrings:[NSArray arrayWithObjects:
                      @"Lorem ipsum", 
                      @"Lorem ipsum dolor",
                      @"Lorem ipsum dolor sit amet",
                      @"Lorem ipsum dolor sit amet, consectetur adipisicing elit",
                      @"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
                      nil]];		
    stringIndex = 0;
  }
 
  return self;
}
 
- (void) onEnter {
  [super onEnter];
  [self nextLabel];
}
 
- (void) nextLabel {	
  [self removeCurrentLabel];
  [self createNextLabel];	
  stringIndex++;	
}
 
- (void) removeCurrentLabel {
  if (label) [self removeChild:label cleanup:YES];
  label = nil;
}
 
- (void) createNextLabel {
  NSString *labelString = [strings objectAtIndex:(stringIndex % [strings count])];
  int fontSize = [self calculateFontSizeForString:labelString fontName:fontName];	
  label = [Label labelWithString:labelString dimensions: CGSizeMake(0, 0) alignment: UITextAlignmentCenter fontName:fontName fontSize:fontSize];
  [label setPosition:ccp(240, 160)];	
  [label setScale:0.5];
  [self addChild:label];
  [self animateLabel];	
}
 
- (void) animateLabel {
  IntervalAction *scale = [ScaleTo actionWithDuration:0.5 scale:1];
  id delay  = [DelayTime actionWithDuration:1]; 
  id notify = [CallFunc actionWithTarget:self selector:@selector(nextLabel)];	
  Sequence *sequence = [Sequence actions:scale, delay, notify, nil];	
  [label runAction:sequence];		
}
 
- (int) calculateFontSizeForString:(NSString*)string fontName:(NSString*)usedFontName {
  int fontSize = 120; // it seems to be the biggest font we can use
  while (--fontSize > 0) {			
    CGSize size = [string sizeWithFont:[UIFont fontWithName:usedFontName size:fontSize]];
    if (size.width <= 480 && size.height <= 360)
      break;
  }				
 
  return fontSize;
}
 
- (void) dealloc {
  [strings retain];
  [fontName retain];
  [super dealloc];
}
 
@end

FitFontTestAppDelegate.m

#import "FitFontTestAppDelegate.h"
 
@implementation FitFontTestAppDelegate
 
- (void)applicationDidFinishLaunching:(UIApplication *)application {
  window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
  [window setUserInteractionEnabled:YES];
  [window setMultipleTouchEnabled:YES];
 
  [[Director sharedDirector] setDeviceOrientation:CCDeviceOrientationLandscapeLeft];
  [[Director sharedDirector] attachInWindow:window];		
  [window makeKeyAndVisible];	
 
  MyScene *scene = [MyScene node];
  [[Director sharedDirector] runWithScene:scene];
 
}
 
 
- (void)dealloc {
  [window release];
  [super dealloc];
}
 
@end
Filed under: Cocos2d, iPhone | 1 Comment »

Radiant iPhone extension 0.0.1

October 9th, 2008 by Andrea Franz

After some works for iPhone I decided to create an extension for Radiant that adds an iPhone tailored ui for the admin panel. It’s the first version and for now it just allows to edit existing pages and add new page parts.

You can find more info in the README file on github.

Radiant iPhone extension

Filed under: Development, Radiant, iPhone | 4 Comments »