// 游戏的初始化，
// 创建游戏的内部数据结构和系统对象。
void CreateGame(HWND hwnd, // 主窗口句柄
DWORD dwInitTimerElapse, //
unsigned int one_level_scores,
DOUBLE level_speedup_ratio,
int boundary_x, int boundary_y,
int init_x, int init_y,
int init_len,
dirction init_dir)
{
// 设置随机数种子
// 需要使用随机数生成食物的位置等。
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
srand(ft.dwLowDateTime);
dbLevelSpeedupRatio = level_speedup_ratio;
dwTimerElapse = dwInitTimerElapse;
dwOneLevelScores = one_level_scores;
// 设置游戏的边界
SetBoundary(boundary_x, boundary_y);
// 创建表示贪吃蛇的数据结构
CreateSnake(init_dir, init_x, init_y, init_len);
// 创建表示食物的数据结构
CreateFood();
// 创建一个计时器
// 每经过 dwTimerElapse 毫秒，hwnd窗口（主窗口）就会收到一个WM_TIMER消息。
// 计时器是驱动本游戏进行的主要时间线。
// dwTimerElapse变量影响游戏进行的快慢变化。
SetTimer(hwnd, TIMER_ID, dwTimerElapse, NULL);
}
//----------------------------------------------------------------------------
void WrigglingSnake::CreateScene ()
{
mScene = new0 Node();
mTrnNode = new0 Node();
mScene->AttachChild(mTrnNode);
mWireState = new0 WireState();
mRenderer->SetOverrideWireState(mWireState);
CreateSnake();
}
//----------------------------------------------------------------------------
bool WrigglingSnake::OnInitialize ()
{
if ( !Application::OnInitialize() )
return false;
m_spkScene = new Node(1);
m_spkTrnNode = new Node(1);
m_spkScene->AttachChild(m_spkTrnNode);
m_spkWireframe = new WireframeState;
m_spkScene->SetRenderState(m_spkWireframe);
ZBufferState* pkZBuffer = new ZBufferState;
pkZBuffer->Enabled() = true;
pkZBuffer->Writeable() = true;
pkZBuffer->Compare() = ZBufferState::CF_LEQUAL;
m_spkScene->SetRenderState(pkZBuffer);
CreateSnake();
// center-and-fit for camera viewing
m_spkScene->UpdateGS(0.0f);
Bound kWBound = m_spkScene->WorldBound();
m_spkTrnNode->Translate() = -kWBound.Center();
ms_spkCamera->SetFrustum(1.0f,100.0f,-0.55f,0.55f,0.4125f,-0.4125f);
Vector3f kCLeft(1.0f,0.0f,0.0f);
Vector3f kCUp(0.0f,0.0f,1.0f);
Vector3f kCDir(0.0f,-1.0f,0.0f);
Vector3f kCLoc = -3.0f*kWBound.Radius()*kCDir;
ms_spkCamera->SetFrame(kCLoc,kCLeft,kCUp,kCDir);
// initial update of objects
ms_spkCamera->Update();
m_spkScene->UpdateGS(0.0f);
m_spkScene->UpdateRS();
// camera turret and tumble mode
m_spkMotionObject = m_spkScene;
m_fTrnSpeed = 0.01f;
m_fRotSpeed = 0.001f;
m_bTurretActive = true;
SetTurretAxes();
return true;
}