猴子原創，歡迎轉載。轉載請註明： 轉載自Cocos2D開發網–Cocos2Dev.com，謝謝。

原文地址: http://www.cocos2dev.com/?p=522

前幾天加入微信圖片分享的時候，發現全屏截圖超出了微信的數據包大小，所以截屏的時候能夠考慮縮小尺寸到0.5倍。
以下的截屏代碼：

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void LHUtil::screenShoot()
{
    Size visibleSize = Director::getInstance()->getVisibleSize();

    //定義一個屏幕大小的渲染紋理
    RenderTexture* renderTexture = RenderTexture::create(visibleSize.width * .5, visibleSize.height * .5, Texture2D::PixelFormat::RGBA8888);

    Scene* curScene = Director::getInstance()->getRunningScene();
    Point ancPos = pCurScene->getAnchorPoint();

    //渲染紋理開始捕捉
    renderTexture->begin();

    // 縮小屏幕截屏區域
    curScene->setScale(.5);
    curScene->setAnchorPoint(cocos2d::Point(0, 0));

    //繪制當前場景
    curScene->visit();

    //結束
    renderTexture->end();

    //保存png
    renderTexture->saveToFile("screenshoot.png", Image::Format::PNG);

    // 恢復屏幕尺寸
    curScene->setScale(1);
    curScene->setAnchorPoint(ancPos);
    CC_SAFE_DELETE(curScene);
}
 

上面是cocos2dx的獲取截屏的方法。

我順便寫下怎樣用OC的UIGraphicsBeginImageContext獲取UIView轉化成UIImage.
以下是ios方法：

-(void)screenShot:(CGRect)rect{
    // 開始設置截屏區域
    UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0);
    [[self.view layer] renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    // 獲取image。能夠依據須要進行尺寸改動
    CGImageRef imageRef = viewImage.CGImage;
    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);
    UIImage *image = [[UIImage alloc] initWithCGImage:imageRefRect];
    
    // 保存圖片到相冊, 這裏會提示用戶授權。不須要保存的話。能夠取消
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    
    // 獲取Documents文件夾
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"temScreenShot.png"];
    
    // 保存image到Documents文件夾
    NSData *imageData = UIImagePNGRepresentation(image);
    [imageData writeToFile:savedImagePath atomically:YES];
    CGImageRelease(imageRefRect);
}
 

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Cocos2dx-截屏並設置圖片尺寸