隨機矩形，迄今最炫的

/*------------------------------------------------------------------------
   DEVCAPS1.C -- Device Capabilities Display Program No. 1
	         (c) Charles Petzold, 1998
 ----------------------------------------------------------------------*/
#include <windows.h>
#include<cmath>
#define NUM 1000
#define TWOPI (2*3.14159)


LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
void DrawRectangle(HWND);

int cxClient, cyClient;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
            PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT ("Bezier") ;
	HWND 		hwnd ;
	MSG 		msg ;
	WNDCLASS 	wndclass ;

	wndclass.style 		= CS_HREDRAW | CS_VREDRAW ;
	wndclass.lpfnWndProc= WndProc ;
	wndclass.cbClsExtra	= 0 ;
	wndclass.cbWndExtra = 0 ;
	wndclass.hInstance 	= hInstance ;
	wndclass.hIcon 		= LoadIcon (NULL, IDI_APPLICATION) ;
	wndclass.hCursor	= LoadCursor (NULL, IDC_ARROW) ;
	wndclass.hbrBackground	= (HBRUSH) GetStockObject (WHITE_BRUSH) ;
	wndclass.lpszMenuName	= NULL ;
	wndclass.lpszClassName	= szAppName ;

	if (!RegisterClass (&wndclass))
	{
		MessageBox (	NULL, TEXT ("This program requires Windows NT!"),
             				szAppName, MB_ICONERROR) ;
		return 0 ;
     }

	hwnd = CreateWindow (	szAppName, TEXT ("Random Rectangles"),
                				WS_OVERLAPPEDWINDOW,
               				    CW_USEDEFAULT, CW_USEDEFAULT,
        				        CW_USEDEFAULT, CW_USEDEFAULT,
   				                NULL, NULL, hInstance, NULL) ;

	ShowWindow (hwnd, iCmdShow) ;
	UpdateWindow (hwnd) ;

	/*while (GetMessage (&msg, NULL, 0, 0))
     {
		TranslateMessage (&msg) ;
		DispatchMessage (&msg) ;
	}*/

	while(TRUE){
		if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			if(msg.message == WM_QUIT) break;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}else
		{
			DrawRectangle(hwnd);
		}

	}
	return msg.wParam ;
}

void DrawBezier(HDC hdc, POINT apt[]){
	PolyBezier(hdc, apt, 4);
	MoveToEx(hdc, apt[0].x, apt[0].y,NULL);
	LineTo(hdc, apt[1].x ,apt[1].y);

	MoveToEx(hdc, apt[2].x, apt[2].y, NULL);
	LineTo(hdc, apt[3].x, apt[3].y);
}
void Draw(HWND hwnd, HDC hdc){
	 RECT rect;
     GetClientRect(hwnd, &rect);
	 for(int x = 0; x< rect.right;x+=10){
	     MoveToEx(hdc, x, 0, NULL);
		 LineTo(hdc, x, rect.bottom);
	 }
	 for(int y = 0; y< rect.bottom; y+=10){
	     MoveToEx(hdc, 0, y, NULL);
		 LineTo(hdc, rect.right, y);
	 }
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	//static int	cxClient, cyClient;
	HDC		hdc ;
	int		i ;
	PAINTSTRUCT	ps ;
	TEXTMETRIC	tm ;
	RECT rect , rect2;
	static POINT aptFigure [10] = {10,70, 50,70, 50,10, 90,10, 90,50,
				     30,50, 30,90, 70,90, 70,30, 10,30 };

	static POINT apt[10];	


	switch (message)
     {
	case WM_SIZE:
		cxClient = LOWORD(lParam);
		cyClient = HIWORD(lParam);
		return 0;

	case WM_PAINT:
		InvalidateRect(hwnd, NULL, TRUE);
		hdc = BeginPaint(hwnd, &ps);
		
		/*Draw(hwnd, hdc);

		
		SelectObject(hdc, CreateHatchBrush(HS_FDIAGONAL,0x7A378B));
		for(i = 0; i<10; i++){
			apt[i].x = cxClient * aptFigure[i].x / 200;
			apt[i].y = cyClient * aptFigure[i].y / 100;
		}
		SetPolyFillMode(hdc, ALTERNATE);
		Polygon(hdc, apt, 10);

		SelectObject(hdc, CreateSolidBrush(0x7CFC00));
		for(i = 0; i< 10; i++)apt[i].x += cxClient / 2;
		SetPolyFillMode(hdc, WINDING);
		Polygon(hdc, apt, 10);

		rect.top = cyClient / 4;
		rect.bottom =3* cyClient / 4;
		rect.left = cxClient / 4;
		rect.right = cxClient*3 / 4;
		SetRect(&rect,rect.left/2, rect.top/2, rect.right/2, rect.bottom/2);*/

		/*矩形函數：
		  FillRect (hdc, &rect, hBrush) ;
		  FrameRect (hdc, &rect, hBrush) ;
		  InvertRect (hdc, &rect) ;
		  SetRect (&rect, xLeft, yTop, xRight, yBottom) ;
		  將矩形沿x軸和y軸移動幾個單元：OffsetRect (&rect, x, y) ;
          增減矩形的尺寸：InflateRect (&rect, x, y) ;
          矩形各字段設定爲0：SetRectEmpty (&rect) ;
          將矩形複製給另一個矩形：CopyRect (&DestRect, &SrcRect) ;
		  取得兩個矩形的交集：IntersectRect (&DestRect, &SrcRect1, &SrcRect2) ;
		  取得兩個矩形的聯集：UnionRect (&DestRect, &SrcRect1, &SrcRect2) ;
		  確定矩形是否爲空：bEmpty = IsRectEmpty (&rect) ;
		  確定點是否在矩形內：bInRect = PtInRect (&rect, point) ;
          您可以用下列敘述來替代CopyRect函數調用：DestRect = SrcRect ;		
		*/

		FillRect(hdc, &rect, CreateSolidBrush(0xEE0000));
		FrameRect(hdc, &rect, (HBRUSH)GetStockObject(BLACK_BRUSH));
		InvertRect(hdc, &rect);

		CopyRect(&rect2, &rect);
		OffsetRect(&rect2, 400, 0);
		FillRect(hdc, &rect2,CreateSolidBrush(0xEE0000) );
		EndPaint(hwnd, &ps);
		
		
		
		
		return 0 ;

	case WM_DESTROY:
		PostQuitMessage (0) ;
		return 0 ;
	}
	return DefWindowProc (hwnd, message, wParam, lParam) ;
}

void DrawRectangle(HWND hwnd)
{
	HBRUSH hBrush;
	HDC    hdc;
	RECT   rect;
	if(cxClient==0 || cyClient == 0)return ;
	SetRect(&rect, rand()% cxClient, rand() % cyClient,
		           rand()% cxClient, rand() % cyClient);
	hBrush = CreateSolidBrush( RGB(rand() % 256, rand()%256, rand() % 256));
	hdc = GetDC(hwnd);
	FillRect(hdc, &rect, hBrush);
	//Sleep(50);
	ReleaseDC(hwnd, hdc);
	DeleteObject(hBrush);

}

產生一系列隨機矩形，效果很炫~