只是馬馬虎虎的 實現了個簡陋的，完成基本思想，剩下的就沒做了。以后在補上，希望有好的方法的留下腳印。
#include <Windows.h>
#include <d3d9.h>
#include <d3dx9.h>
#pragma comment(lib, "d3d9.lib")
#pragma comment(lib, "d3dx9.lib")
#pragma comment(lib, "winmm.lib")
LPDIRECT3D9 g_pd3d = 0;
LPDIRECT3DDEVICE9 g_pd3dDevice = 0;
LPDIRECT3DVERTEXBUFFER9 g_pVB = 0;
const int g_width = 1024;
const int g_height = 768;
struct CUSTOMVERTEX
{
FLOAT x, y, z, rhw;
DWORD color;
//CUSTOMVERTEX(FLOAT _x, FLOAT _y, FLOAT _z, FLOAT _rhw, DWORD _color)
// :x(_x)
// ,y(_y)
// ,z(_z)
// ,rhw(_rhw)
// ,color(_color){}
};
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE)
HRESULT InitD3D(HWND hwnd)
{
if (NULL == (g_pd3d = Direct3DCreate9(D3D_SDK_VERSION)))
{
MessageBox(NULL, "Create D3D Failed!", "Lession13", MB_OK);
return E_FAIL;
}
D3DCAPS9 caps;
int vp = 0;
g_pd3d->GetDeviceCaps(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, &caps);
if (caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)
vp = D3DCREATE_HARDWARE_VERTEXPROCESSING;
else
vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;
D3DPRESENT_PARAMETERS d3dpp;
::ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8;
d3dpp.BackBufferCount = 1;
d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8;
d3dpp.BackBufferHeight = g_height;
d3dpp.BackBufferWidth = g_width;
d3dpp.EnableAutoDepthStencil = true;
d3dpp.Flags = 0;
d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
d3dpp.hDeviceWindow = hwnd;
d3dpp.MultiSampleQuality = 0;
d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.Windowed = true;
if (FAILED(g_pd3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd, vp, &d3dpp, &g_pd3dDevice)))
{
MessageBox(NULL, "Create Device Failed!", "Lession13", MB_OK);
return E_FAIL;
}
//D3DXMATRIX matProj;
//D3DXMatrixIdentity(&matProj);
//D3DXMatrixPerspectiveFovLH(&matProj, D3DX_PI/4, 1, 1, 1000);
//g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
return S_OK;
}
HRESULT InitVB(FLOAT angle, LPRECT rt, DWORD dwColor)
{
//float angle = (360*0.01)*nPercent;
int nArea = angle / 45;
int nTriangles = nArea + 1;
int nPoints = nArea + 2;
// 規定中心點
int ndivX = (rt->right - rt->left)>>1;
int ndivY = (rt->bottom - rt->top)>>1;
// 默認的賦值
CUSTOMVERTEX pVerteics[] =
{
{ndivX, ndivY, 0, 0.f, dwColor}, // 1
{ndivX, rt->top, 0, 0.f, dwColor}, // 2
{rt->left, rt->top, 0, 0.f, dwColor}, // 3
{rt->left, ndivY, 0, 0.f, dwColor}, // 4
{rt->left, rt->bottom, 0, 0.f, dwColor}, // 5
{ndivX, rt->bottom, 0, 0.f, dwColor}, // 6
{rt->right, rt->bottom, 0, 0.f, dwColor}, // 7
{rt->right, ndivY, 0, 0.f, dwColor}, // 8
{rt->right, rt->top, 0, 0.f, dwColor}, // 9
{ndivX, rt->top, 0, 0.f, dwColor}, // 2
};
int leave_angle = (int)angle % 45;
if (!leave_angle)
{
nTriangles -= 1;
}
// 計算此時秒針的向量
D3DXVECTOR2 v = *(D3DXVECTOR2 *)(pVerteics+nTriangles);
D3DXVECTOR2 v2 = *(D3DXVECTOR2 *)(pVerteics+nPoints);
D3DXVECTOR2 nor = *(D3DXVECTOR2 *)(pVerteics);
D3DXVECTOR2 vResult;
if ((angle!=45)||(angle!=225))
{
D3DXVECTOR2 vDummy1 = v - nor;
D3DXVECTOR2 vDummy2 = v2- nor;
//D3DXVec2Lerp(&vResult, &vDummy1, &vDummy2, leave_angle);
switch (nArea)
{
case 0:
vResult.y = 0;
vResult.x = ndivX - ndivY*tanf((leave_angle)*D3DX_PI/180);
break;
case 1:
vResult.x = rt->left;
vResult.y = ndivY - ndivX*tanf((45-leave_angle)*D3DX_PI/180);
break;
case 2:
vResult.x = rt->left;
vResult.y = ndivY + ndivX*tanf((leave_angle)*D3DX_PI/180);
break;
case 3:
vResult.y = rt->bottom;
vResult.x = ndivX - ndivY*tanf((45-leave_angle)*D3DX_PI/180);
break;
case 4:
vResult.y = rt->bottom;
vResult.x = ndivX + ndivY*tanf((leave_angle)*D3DX_PI/180);
break;
case 5:
vResult.x = rt->right;
vResult.y = ndivY + ndivX*tanf((45-leave_angle)*D3DX_PI/180);
break;
case 6:
vResult.x = rt->right;
vResult.y = ndivY - ndivX*tanf((leave_angle)*D3DX_PI/180);
break;
case 7:
vResult.x = ndivX + ndivY * tanf((45-leave_angle)*D3DX_PI/180);
vResult.y = rt->top;
break;
}
*(D3DXVECTOR2 *)(pVerteics+nPoints) = vResult;
}
else
{
D3DXVec2Lerp(&vResult, &v, &v2, leave_angle/45);
*(D3DXVECTOR2 *)(pVerteics+nPoints) = vResult;
}
//g_pd3dDevice->CreateVertexBuffer((nPoints+1)*sizeof(CUSTOMVERTEX), D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_MANAGED, &g_pVB, 0);
//void * pV;
//if (SUCCEEDED(g_pVB->Lock(0, 0, (void **)&pV, 0)))
//{
// memcpy(pV, pVerteics, (nPoints+1)*sizeof(CUSTOMVERTEX));
// g_pVB->Unlock();
//}
g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, 0xffffffff, 1.f, 0);
g_pd3dDevice->BeginScene();
//g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(CUSTOMVERTEX));
g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
//g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLEFAN, nTriangles, nPoints);
g_pd3dDevice->DrawPrimitiveUP(D3DPT_TRIANGLEFAN,nTriangles,pVerteics,sizeof(CUSTOMVERTEX));
g_pd3dDevice->EndScene();
g_pd3dDevice->Present(0, 0, 0, 0);
return S_OK;
}
VOID Cleanup()
{
if (g_pVB)
{
g_pVB->Release();
g_pVB = 0;
}
if (g_pd3dDevice)
{
g_pd3dDevice->Release();
g_pd3dDevice = 0;
}
if (g_pd3d)
{
g_pd3d->Release();
g_pd3d = 0;
}
}
int timeCounter = 0;
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch( msg )
{
case WM_CREATE:
SetTimer(hWnd, 1, 25, NULL);
return 0;
case WM_DESTROY:
Cleanup();
PostQuitMessage( 0 );
return 0;
case WM_TIMER:
{
timeCounter++;
timeCounter%=360;
RECT rt= {0, 0, 200, 200};
InitVB(360-timeCounter, &rt, 0xffff0000);
}
return 0;
}
return DefWindowProc( hWnd, msg, wParam, lParam );
}
//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: The application's entry point
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
// Register the window class
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
"D3D Tutorial", NULL };
RegisterClassEx( &wc );
// Create the application's window
HWND hWnd = CreateWindow( "D3D Tutorial", "D3D Tutorial 05: Textures",
WS_OVERLAPPEDWINDOW, 100, 100, g_width, g_height,
NULL, NULL, wc.hInstance, NULL );
// Initialize Direct3D
if( SUCCEEDED( InitD3D( hWnd ) ) )
{
//// Create the scene geometry
//if( SUCCEEDED( InitVB() ) )
//{
// Show the window
ShowWindow( hWnd, SW_SHOWDEFAULT );
UpdateWindow( hWnd );
// Enter the message loop
MSG msg;
ZeroMemory( &msg, sizeof(msg) );
while( msg.message!=WM_QUIT )
{
if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
else
{
}
}
//}
}
UnregisterClass( "D3D Tutorial", wc.hInstance );
return 0;
}