cocos2d-x自适应屏幕分辨率

http://www.cnblogs.com/GameDeveloper/archive/2011/11/02/cocos2d-x.html

 

Android下分辨率太多，不太可能为每种分辨率做一套资源，目前一般来说比较流行的是320*480, 800*400, 854*400。当然现在720P的也出来了，但至少目前不是主流机型^_^.

对于不支持的分辨率，我希望的是能够按照屏幕大小按比例缩放，即有了下面的代码。

1:ViewAutoScale

写了一个ViewAutoScale函数，如下：

 

#include "ViewAutoScale.h"
USING_NS_CC;

bool IsMatchDisplay(int w, int h, CCSize& size )
{
    return (w==size.width && h==size.height) || (h==size.width && w==size.height);
}

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
int ViewAutoScale(cocos2d::CCEGLView* view,
                  void* title,
                  int width,
                  int height,
                  cocos2d::CCSize* supportDisplay,
                  int displays,
                  int defaultWidth,
                  int defaultHeight)
{
    if(view == NULL)
    {
        return -1;
    }
    for (int i=0; i < displays; i++)
    {
        if (IsMatchDisplay(width, height, supportDisplay[i]))
        {
            view->Create((LPCTSTR)title, width, height);
            return i+1;
        }
    }
    view->Create((LPCTSTR)title, defaultWidth, defaultHeight);

    view->setScreenScale(min((float)width/ defaultWidth, (float)height/ defaultHeight));
    view->resize(width, height);
    view->centerWindow();
    return 0;
}

#endif

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
int ViewAutoScale(cocos2d::CCEGLView* view,
                  void* title,
                  int width,
                  int height,
                  cocos2d::CCSize* supportDisplay,
                  int displays,
                  int defaultWidth,
                  int defaultHeight)
{
    if(view == NULL)
    {
        return -1;
    }
    for (int i=0; i < displays; i++)
    {
        if (IsMatchDisplay(width, height, supportDisplay[i]))
        {
            return i+1;
        }
    }
    view->create(defaultWidth, defaultHeight);
    return 0;
}
#endif

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
int ViewAutoScale(cocos2d::CCEGLView* view,
                  void* title,
                  int width,
                  int height,
                  cocos2d::CCSize* supportDisplay,
                  int displays,
                  int defaultWidth,
                  int defaultHeight)
{
    return 0;
}
#endif

2：使用方法

 

（1） windows

修改AppDelegate.cpp文件：

 

bool AppDelegate::initInstance()
{
    bool bRet = false;
    do
    {
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
        CCSize sSupportDisplay[]={CCSize(480, 320), CCSize(1024, 768)};
        // Initialize OpenGLView instance, that release by CCDirector when application terminate.
        // The HelloWorld is designed as HVGA.
        CCEGLView * pMainWnd = new CCEGLView();
        CC_BREAK_IF(! pMainWnd);
        if (ViewAutoScale(pMainWnd, TEXT("Pyramid"),
                            g_winWidth,
                            g_winHeight,
                            sSupportDisplay,
                            sizeof(sSupportDisplay)/sizeof(CCSize),
                            480, 320) < 0)
        {
            return false;
        }
#endif  // CC_PLATFORM_WIN32

其中g_winWidth和g_winHeight为参数传递进来的窗口大小，这样在windows上可任意设定窗口大小，改成对应值即可。

 

 

(2) Android

修改jni/helloworld/main.cpp文件：

 

void Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*  env, jobject thiz, jint w, jint h)
{
    cocos2d::CCSize sSupportDisplay[]={cocos2d::CCSize(480, 320)};
    if (!cocos2d::CCDirector::sharedDirector()->getOpenGLView())
    {
    cocos2d::CCEGLView *view = &cocos2d::CCEGLView::sharedOpenGLView();
        view->setFrameWidthAndHeight(w, h);
        // if you want to run in WVGA with HVGA resource, set it
        ViewAutoScale(view,
                    NULL,
                    w,
                    h,
                    sSupportDisplay,
                    sizeof(sSupportDisplay)/sizeof(CCSize),
                    480, 320);
....

 

3：说明

（1） ViewAutoScale里我偷懒了，发现没有找到匹配分辨率时，就选择默认的分辨率。稍微改一下可以匹配最接近的分辨率

（2）目前实现的是等比缩放，资源按照目前屏幕大小适配。如果想实现铺满整个屏幕，修改如下：

  windows下直接修改ViewAutoScale：

     将view->setScreenScale(min((float)width/ defaultWidth, (float)height/ defaultHeight)); 修改为：

           view->setScreenScale(max((float)width/ defaultWidth, (float)height/ defaultHeight));

 android 下需要修改cocos2dx代码，在文件platform\android\CCEGLView_android.cpp 的void CCEGLView::create(int width, int height)中，修改如下：

// calculate the factor and the rect of viewport
m_fScreenScaleFactor =  MAX((float)m_sSizeInPixel.width / m_sSizeInPoint.width,
                        (float)m_sSizeInPixel.height / m_sSizeInPoint.height);

 

（3）还没研究过动态调整适配:).