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#ifndef VIEW_AUTO_SCALE_H
#define VIEW_AUTO_SCALE_H
#include "cocos2d.h"
int
ViewAutoScale(cocos2d::CCEGLView* view,
void
* title,
int
width,
int
height,
cocos2d::CCSize* supportDisplay,
int
displays,
int
defaultWidth,
int
defaultHeight);
inline
bool
IsMatchDisplay(
int
w,
int
h,cocos2d::CCSize& size)
{
return
(w==size.width && h==size.height) || (h==size.width && w==size.height);
}
#endif
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创建ViewAutoScale.cpp，实现各个平台的缩放功能：
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#include "ViewAutoScale.h"
using
namespace
cocos2d;
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
int
ViewAutoScale(cocos2d::CCEGLView* view,
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,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
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接着要在各个平台进行调用了：
(1) Win32平台
在AppDelegate.cpp的AppDelegate::initInstance()里添加：
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#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
// Initialize OpenGLView instance,that release by CCDirector when application terminate.
// The HelloWorld is designed as HVGA.
#define GAME_WIDTH 960
#define GAME_HEIGHT 540
#define DEFAULT_WIDTH 1024
#define DEFAULT_HEIGHT 768
CCSize sSupportDisplay[] = {CCSize(1024,768)};
CCEGLView * pMainWnd =
new
CCEGLView();
CC_BREAK_IF(! pMainWnd);
if
(ViewAutoScale(pMainWnd,TEXT(
"IQ:960x540"
),
GAME_WIDTH,
GAME_HEIGHT,
sSupportDisplay,
sizeof
(sSupportDisplay)/
sizeof
(CCSize),
DEFAULT_WIDTH,DEFAULT_HEIGHT) < 0)
{
return
false
;
}
#endif // CC_PLATFORM_WIN32
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sSupportDisplay为你的游戏能支持的分辨率，就是准备的图片的尺寸。DEFAULT_WIDTH和DEFAULT_HEIGHT表示游戏默认使用的图片尺寸，如果游戏运行的机器屏幕不在准备的范围内，就以默认的值为基数进行缩放。下面是在各分辨率下运行的效果，1024×768刚好跟图片尺寸一样，效果是完美的，刚好全屏，这里就不贴出了。在博客上看到的图片可能是变形的，是为了避免图片超出网页边框，就对图片宽度进行了压缩，真实的图片是没有变形的。
960×540：
800×480：
(2)android平台
修改/jni/helloworld/main.cpp:
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void
Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv* env,jobject thiz,jint w,jint h)
{
cocos2d::CCSize sSupportDisplay[] = { cocos2d::CCSize(1024,768) };
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
// view->create(480,320); Please change it to (320,480) if you're in portrait mode.
ViewAutoScale(view,NULL,w,h,sSupportDisplay,
sizeof
(sSupportDisplay) /
sizeof
(CCSize),1024,768);
cocos2d::CCDirector::sharedDirector()->setOpenGLView(view);
AppDelegate *pAppDelegate =
new
AppDelegate();
cocos2d::CCApplication::sharedApplication().run();
}
else
{
cocos2d::CCTextureCache::reloadAllTextures();
cocos2d::CCDirector::sharedDirector()->setGLDefaultValues();
}
}
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下图是800×480分辨率模拟器上的效果：
如果你需要游戏能全屏显示的话，就选择缩放倍数小的值，即缩放因子大的值，修改ViewAutoScale.cpp：
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view->setScreenScale(min((
float
)width/ defaultWidth,(
float
)height/ defaultHeight));
//改成
view->setScreenScale(max((
float
)width/ defaultWidth,(
float
)height/ defaultHeight));
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运行到android平台还需要修改引擎的源码，因为引擎默认使用的是min方式，修改platform\android\CCEGLView_android.cpp的CCEGLView::create(int width,int height)函数：
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m_fScreenScaleFactor = MIN((
float
)m_sSizeInPixel.width / m_sSizeInPoint.width,
(
float
)m_sSizeInPixel.height / m_sSizeInPoint.height);
//改成
m_fScreenScaleFactor = MAX((
float
)m_sSizeInPixel.width / m_sSizeInPoint.width,
(
float
)m_sSizeInPixel.height / m_sSizeInPoint.height);
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下面是CCEGLView::create(int width,int height)函数的完整源码：
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void
CCEGLView::create(
int
width,
int
height)
{
if
(width == 0 || height == 0)
{
return
;
}
m_sSizeInPoint.width = width;
m_sSizeInPoint.height = height;
// calculate the factor and the rect of viewport
m_fScreenScaleFactor = MIN((
float
)m_sSizeInPixel.width / m_sSizeInPoint.width,
(
float
)m_sSizeInPixel.height / m_sSizeInPoint.height);
int
viewPortW = (
int
)(m_sSizeInPoint.width * m_fScreenScaleFactor);
int
viewPortH = (
int
)(m_sSizeInPoint.height * m_fScreenScaleFactor);
m_rcViewPort.origin.x = (m_sSizeInPixel.width - viewPortW) / 2;
m_rcViewPort.origin.y = (m_sSizeInPixel.height - viewPortH) / 2;
m_rcViewPort.size.width = viewPortW;
m_rcViewPort.size.height = viewPortH;
m_bNotHVGA =
true
;
}
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demo源码下载地址：http://download.csdn.net/detail/zhoujianghai/4814684
