Cocos2dx进阶学习之屏幕适配

http://cocos2d.9tech.cn/news/2014/0307/39995.html


背景

在学习cocos2dx时,我们在main函数中发现一句代码

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#include "main.h"
#include "AppDelegate.h"
#include "CCEGLView.h"
USING_NS_CC;
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdshow)
{
UNREFERENCED_ParaMETER(hPrevInstance);
UNREFERENCED_ParaMETER(lpCmdLine);
// create the application instance
AppDelegate app;
CCEGLView* eglView = CCEGLView::sharedOpenGLView();
eglView->setViewName( "CrazyMario" );
eglView->setFrameSize(480,320);
return CCApplication::sharedApplication()->run();
}

那就是eglView->setFrameSize(480,320),这句代码设置了窗口的大小,一般说来手机游戏需要全屏显示,所以对于不同分辨率的手机,setFrameSize要求不一样的。这样是不是很崩溃?因为我们代码里很多地方可能也要改,图片大小可能也要改,那怎么办呢?

其实cocos2dx已经为我们做好了这一切

结局方案

这个方案就是调用eglView->setDesignResolutionSize(480,320,kResolutionShowAll);来告诉cocos2dx,我的程序是按照480,320来设计的,那么setFrameSize如果不是480,320那么cocos2dx会按照比例给我们做适配,不用我们做别的事情。

在超级马里奥这个游戏里,在AppDelegate中已经调用了setDesignResolutionSize函数设置设计大小为480,320

那么在setFrameSize不同的情况下,也不会引起图片比例不合适的情况,只是窗口大小会发生变化而已

在480*320的情况下

在960*640的情况下,只是界面变大了,图片没有任何的不适合

setDesignResolutionSize的参数

第三个参数的取值范围如下:

24
enum ResolutionPolicy
{
// The entire application is visible in the specified area without trying to preserve the original aspect ratio.
// distortion can occur,and the application may appear stretched or compressed.
kResolutionExactFit,
// The entire application fills the specified area,without distortion but possibly with some cropping,
// while maintaining the original aspect ratio of the application.
kResolutionNoBorder,
// The entire application is visible in the specified area without distortion while maintaining the original
// aspect ratio of the application. Borders can appear on two sides of the application.
kResolutionShowAll,
// The application takes the height of the design resolution size and modifies the width of the internal
// canvas so that it fits the aspect ratio of the device
// no distortion will occur however you must make sure your application works on different
// aspect ratios
kResolutionFixedHeight,
// The application takes the width of the design resolution size and modifies the height of the internal
// canvas so that it fits the aspect ratio of the device
// no distortion will occur however you must make sure your application works on different
// aspect ratios
kResolutionFixedWidth,
kResolutionUnKNown,
};

kResolutionExactFit:会靠拉伸来填满屏幕,本例来说背景图会变形来填充屏幕,因为1024:768=1.3, 480:320=1.5,宽高比不同,图片也就无法等比缩放来填满屏幕,只能变形了。

kResolutionNoBorder: 看不到黑边,实际就是宽高等比缩放,但缩放比例取宽比和高比之中大的那一个

kResolutionShowAll:全部显示,可以理解为保证内容显示在屏幕之内,实际也是宽高等比缩放,但缩放比例取宽比和高比之中小的那一个

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