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：

view plain

#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：

view plain

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：

view plain

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:).