landscape or portrait

最新推荐文章于 2020-03-20 20:11:13 发布

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最新推荐文章于 2020-03-20 20:11:13 发布

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文章标签：游戏移动开发

原文链接：http://www.cnblogs.com/cocos2d-x/archive/2012/02/28/2371429.html

我们的程序是风景模式还是肖像模式？使用cocos2d-x在Win32平台做开发时，如何进行设置？在继续下面的教程之前，有必要弄清楚这些问题。

什么是风景模式？什么是肖像模式？

根据我的理解：宽度大于高度有着更宽阔的视野，适合欣赏风景；高度大于宽度能给站立的人物一个特写，适合画肖像。

在cocos2d-x代码中，对设备方向有这样的定义：

 1 /** @typedef ccDeviceOrientation
 2  Possible device orientations
 3  */
 4 typedef enum {
 5     /// Device oriented vertically, home button on the bottom
 6     kCCDeviceOrientationPortrait = 0, // UIDeviceOrientationPortrait,    
 7     /// Device oriented vertically, home button on the top
 8     kCCDeviceOrientationPortraitUpsideDown = 1, // UIDeviceOrientationPortraitUpsideDown,
 9     /// Device oriented horizontally, home button on the right
10     kCCDeviceOrientationLandscapeLeft = 2, // UIDeviceOrientationLandscapeLeft,
11     /// Device oriented horizontally, home button on the left
12     kCCDeviceOrientationLandscapeRight = 3, // UIDeviceOrientationLandscapeRight,
13 
14     // Backward compatibility stuff
15     CCDeviceOrientationPortrait = kCCDeviceOrientationPortrait,
16     CCDeviceOrientationPortraitUpsideDown = kCCDeviceOrientationPortraitUpsideDown,
17     CCDeviceOrientationLandscapeLeft = kCCDeviceOrientationLandscapeLeft,
18     CCDeviceOrientationLandscapeRight = kCCDeviceOrientationLandscapeRight,
19 } ccDeviceOrientation;

根据注释所说，肖像模式是设备为垂直方向的，home键在下方。想象一下手机，这个不难理解。

如何设置设备的方向呢？

在cocos2d-x上我们通过CCDirector的getDeviceOrientation获取设备方向，setDeviceOrientation设置设备方向。但如果是在Win32平台上就要特别对待。请看：

 1 ccDeviceOrientation CCDirector::getDeviceOrientation(void)
 2 {
 3     return m_eDeviceOrientation;
 4 }
 5 
 6 void CCDirector::setDeviceOrientation(ccDeviceOrientation kDeviceOrientation)
 7 {
 8     ccDeviceOrientation eNewOrientation;
 9 
10     eNewOrientation = (ccDeviceOrientation)CCApplication::sharedApplication().setOrientation(
11         (CCApplication::Orientation)kDeviceOrientation);
12 
13     if (m_eDeviceOrientation != eNewOrientation)
14     {
15         m_eDeviceOrientation = eNewOrientation;
16     }
17     else
18     {
19         // this logic is only run on win32 now
20         // On win32,the return value of CCApplication::setDeviceOrientation is always kCCDeviceOrientationPortrait
21         // So,we should calculate the Projection and window size again.
22         m_obWinSizeInPoints = m_pobOpenGLView->getSize();
23         m_obWinSizeInPixels = CCSizeMake(m_obWinSizeInPoints.width * m_fContentScaleFactor,
               m_obWinSizeInPoints.height * m_fContentScaleFactor);
24         setProjection(m_eProjection);
25     }
26 }

大家可以注意到在Win32平台上，setDeviceOrientation并不更新m_eDeviceOrientation，所以m_eDeviceOrientation总是保持他的默认值——CCDeviceOrientationPortrait。也就是说getDeviceOrientation的返回值总是CCDeviceOrientationPortrait。

那么在Win32平台上如何设置设备方向呢？来看下模板为我们生成的初始化代码：

 1 bool AppDelegate::initInstance()
 2 {
 3     bool bRet = false;
 4     do 
 5     {
 6 #if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
 7 
 8         // Initialize OpenGLView instance, that release by CCDirector when application terminate.
 9         // The HelloWorld is designed as HVGA.
10         CCEGLView * pMainWnd = new CCEGLView();
11         CC_BREAK_IF(! pMainWnd
12                 || ! pMainWnd->Create(TEXT("cocos2d: Hello World"), 480, 320));
13 
14 #endif  // CC_PLATFORM_WIN32
15         bRet = true;
16     } while (0);
17     return bRet;
18 }