cocos2d 如何创建继承与 ccsprite的类并在项目中使用

Posted 2023-05-12

通过新建objective-C class ，继承ccsprite
你会得到一个.h和.m文件
这个类就是你继承ccsprite的类 如需使用它 引用其头文件即可 参考技术A iphone开发的东西不要提到java分区来

设置 CCSprite 的框架？

【中文标题】设置 CCSprite 的框架？

【英文标题】：Set frame of CCSprite?

【发布时间】：2013-05-30 13:29:40

【问题描述】：

我有一张图片，我想用 CCSprite 显示不同的尺寸。我通常知道 CCSprite 只添加图像宽度和高度的图像，但我想知道是否有任何方法，所以我不必先手动缩放图像，如下所示，然后将图像提供给 ccpsrite?? p>

-(UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize image:(UIImage*)sourceImage

    UIImage *newImage = sourceImage;
CGSize imageSize = sourceImage.size;

/// Source image is of desired size or desired size 0x0, no change is done
if (!CGSizeEqualToSize(targetSize, CGSizeZero) && !CGSizeEqualToSize(imageSize, targetSize))

    CGFloat aspectRatio = imageSize.width / imageSize.height;
    CGFloat newAspectRatio = targetSize.width / targetSize.height;

    CGSize tempSize = targetSize;
    if (newAspectRatio < aspectRatio)
    
        tempSize.width = targetSize.width * aspectRatio / newAspectRatio;
    
    else
    
        tempSize.height = targetSize.height * newAspectRatio / aspectRatio;
    
    UIGraphicsBeginImageContext(targetSize);
    [sourceImage drawInRect:CGRectMake((targetSize.width - tempSize.width) / 2.0, (targetSize.height - tempSize.height) / 2.0, tempSize.width, tempSize.height)];
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();


return newImage;

【参考方案1】：

您可以扩展您的CCSprite。 CCSprite 是CCNode 的子类，CCNode 具有以下属性：

/** The scale factor of the node. 1.0 is the default scale factor. It modifies the X and Y scale at the same time. */
@property(nonatomic,readwrite,assign) float scale;
/** The scale factor of the node. 1.0 is the default scale factor. It only modifies the X scale factor. */
@property(nonatomic,readwrite,assign) float scaleX;
/** The scale factor of the node. 1.0 is the default scale factor. It only modifies the Y scale factor. */
@property(nonatomic,readwrite,assign) float scaleY;

【参考方案2】：

您可以添加一个自定义类，比如 FlexSprite 并执行此操作

在 FlexSprite.h 中

@interface FlexSprite : CCSprite

+(FlexSprite*)spriteWithFile:(NSString *)imageName frame:(CGSize )size;
-(id)initWithFile:(NSString *)imageName frame:(CGSize )size;
@end

在 FlexSprite.m 中

#import "FlexSprite.h"
@implementation FlexSprite
-(id)initWithFile:(NSString *)imageName frame:(CGSize )size
    self = [super initWithFile:imageName];
    if (self) 
        self.scaleX = size.width/self.contentSize.width;
        self.scaleY = size.height/self.contentSize.height;
    
    return self;


+(FlexSprite *)spriteWithFile:(NSString *)imageName frame:(CGSize )size
    return [[[self alloc]initWithFile:imageName frame:size]autorelease];


@end