Cocosd-x屏比

来源：互联网发布：sas软件好学吗编辑：程序博客网时间：2024/06/03 00:59

完美主义情况下android自适屏，最好的方式当然是做多套不同分辨率屏幕大小的图片资源，但是一般作为我们这样的小团队开发，不会去花费太多的时间去做多套不同的资源，能给你多做几个封面就不错了，所以这个重任又从美术的头上落到我们程序猿的头上，在cocos2d-x中android包默认支持等比例的屏幕缩放，具体实现方式，在jni/helloworld/main.cpp中增加如下代码即可。继续拿HelloWorld开刀!

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voidJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*  env,jobjectthiz,jintw,jinth)
{
    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.
        view->create(480,320);// 增加此句即可，480*320是你的游戏标准大小
        cocos2d::CCDirector::sharedDirector()->setOpenGLView(view);
        AppDelegate*pAppDelegate=newAppDelegate();
        cocos2d::CCApplication::sharedApplication().run();
    }
    else
    {
        cocos2d::CCTextureCache::reloadAllTextures();
        cocos2d::CCDirector::sharedDirector()->setGLDefaultValues();
    }
}

等比缩放效果图:
cocos2d-x-android-screen-scale-img-01

这样游戏就已经等比缩放了，不过在大部分android手机上会有黑边，虽然我个人比较喜欢这种方式，因为等比缩放游戏画面不会变形，但是通常情况下我说是没用的，策划说要全屏的，测试说要全屏的，我说让美术做个图，美术说要约会，没时间加班，好吧。又成了程序员的事了。

上面说过cocos2d-x默认支持等比例缩放，从源代码可以看出来，这些源代码在cocos2dx/platform/android下面，在CCEGLView_android.cpp中

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voidCCEGLView::create(intwidth,intheight)
{
    if(width==0||height==0)
    {
        return;
    }
    m_sSizeInPoint.width=width;
    m_sSizeInPoint.height=height;
    // calculate the factor and the rect of viewport
    // 这里取宽高需要缩放比例中小的那个作为等比缩放的比例，可以保证画面完全显示，但是会有黑边
    // !!!需要修改的地方就是这里!!!
    m_fScreenScaleFactor=  MIN((float)m_sSizeInPixel.width/m_sSizeInPoint.width,
                                (float)m_sSizeInPixel.height/m_sSizeInPoint.height);
    intviewPortW=(int)(m_sSizeInPoint.width*m_fScreenScaleFactor);
    intviewPortH=(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;
}

在CCEGLView_android中增加宽高不同的缩放参数，并使用这两个参数来对画面进行不等比缩放

CCEGLView_android.h中增加

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float  getScreenScaleFactor();
// Hxs add for non uniform scale. 2013/05/15
float  getScreenScaleFactorX();
float  getScreenScaleFactorY();
/*********************/
float  m_fScreenScaleFactor;  // 原本只有一个缩放参数，等比缩放会有黑边
// Hxs add for non uniform scale. 2013/05/15
floatm_fScreenScaleFactorX;    // X,Y方向的缩放参数
floatm_fScreenScaleFactorY;

CCEGLView_android.cpp中

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#define NON_UNIFORM_SCALE 1 // 不等比缩放开关 宏定义
/* 修改create(int width, int height) / CCEGLView::setViewPortInPoints(float x, float y, float w, float h) / CCEGLView::setScissorInPoints(float x, float y, float w, float h)方法中关于缩放的处理 */
voidCCEGLView::create(intwidth,intheight)
{
    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);
#if NON_UNIFORM_SCALE
    m_fScreenScaleFactorX=(float)m_sSizeInPixel.width/m_sSizeInPoint.width;// 分别得到X,Y的缩放参数
    m_fScreenScaleFactorY=(float)m_sSizeInPixel.height/m_sSizeInPoint.height;
#else
    m_fScreenScaleFactorX=m_fScreenScaleFactor;// 等比例缩放
    m_fScreenScaleFactorY=m_fScreenScaleFactor;
#endif
    intviewPortW=(int)(m_sSizeInPoint.width*m_fScreenScaleFactorX);
    intviewPortH=(int)(m_sSizeInPoint.height*m_fScreenScaleFactorY);
    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;
}
voidCCEGLView::setViewPortInPoints(floatx,floaty,floatw,floath)
{
    if(m_bNotHVGA)
    {
        floatfactorX=m_fScreenScaleFactorX/CC_CONTENT_SCALE_FACTOR();
        floatfactorY=m_fScreenScaleFactorY/CC_CONTENT_SCALE_FACTOR();
        glViewport((GLint)(x*factorX)+m_rcViewPort.origin.x,
            (GLint)(y*factorY)+m_rcViewPort.origin.y,
            (GLint)(w*factorX),
            (GLint)(h*factorY));
    }
    else
    {
        glViewport((GLint)x,
            (GLint)y,
            (GLint)w,
            (GLint)h);
    }      
}
 
voidCCEGLView::setScissorInPoints(floatx,floaty,floatw,floath)
{
    if(m_bNotHVGA)
    {
        floatfactorX=m_fScreenScaleFactorX/CC_CONTENT_SCALE_FACTOR();
        floatfactorY=m_fScreenScaleFactorY/CC_CONTENT_SCALE_FACTOR();
        glScissor((GLint)(x*factorX)+m_rcViewPort.origin.x,
            (GLint)(y*factorY)+m_rcViewPort.origin.y,
            (GLint)(w*factorX),
            (GLint)(h*factorY));
    }
    else
    {
        glScissor((GLint)x,
            (GLint)y,
            (GLint)w,
            (GLint)h);
    }      
}
/* 增加getScreenScaleFactorX/getScreenScaleFactorY的实现 */
floatCCEGLView::getScreenScaleFactorX()
{
        returnm_fScreenScaleFactorX;
}
 
floatCCEGLView::getScreenScaleFactorY()
{
        returnm_fScreenScaleFactorY;
}

到此为止，画面上的缩放已经完成啦，但是缩放后触摸的位置还需要修正，继续修改cocos2dx/platform/android/jni/TouchesJni.cpp中关于触摸的缩放，此文件中有多处需要修改的敌方，但是修改方式都一样。以Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeTouchesBegin为例

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voidJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeTouchesBegin(JNIEnv*  env,jobjectthiz,jintid,jfloatx,jfloaty)
{
    CCRectrcRect=CCEGLView::sharedOpenGLView().getViewPort();
    //float fScreenScaleFactor = CCEGLView::sharedOpenGLView().getScreenScaleFactor();
    floatfScreenScaleFactorX=CCEGLView::sharedOpenGLView().getScreenScaleFactorX();
    floatfScreenScaleFactorY=CCEGLView::sharedOpenGLView().getScreenScaleFactorY();
    CCSetset;
    CCTouch*pTouch=s_pTouches[id];
    if(!pTouch)
    {
        LOGD("Beginning touches with id: %d, x=%f, y=%f",id,x,y);
        pTouch=newCCTouch();        
        //pTouch->SetTouchInfo(0, (x - rcRect.origin.x) / fScreenScaleFactor, (y - rcRect.origin.y) / fScreenScaleFactor, id);
        // 分别对x 和 y进行缩放
        pTouch->SetTouchInfo(0,(x-rcRect.origin.x)/fScreenScaleFactorX,(y-rcRect.origin.y)/fScreenScaleFactorY,id);
        s_pTouches[id]=pTouch;
        set.addObject(pTouch);
        cocos2d::CCDirector::sharedDirector()->getOpenGLView()->getDelegate()->touchesBegan(&set,NULL);
    }  
    else
    {
        LOGD("Beginnig touches with id: %d error",id);
    }
}

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