WIN32下的模拟时钟

#include 
#include 
#include 
#include "resource.h"

#define PI 3.1415926

BOOLEAN InitWindowClass(HINSTANCE hInstance, int nCmdShow);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpcmdLine, int nCmdShow)
{
	MSG msg;
	if (!InitWindowClass(hInstance,nCmdShow))
	{
		MessageBox(NULL, L"Failed to Create Windows", L"InFo", NULL);
		return 1;
	}
	while (GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return (int)msg.wParam;
}

BOOLEAN InitWindowClass(HINSTANCE hInstance, int nCmdShow)
{
	WNDCLASSEX wcex;
	HWND hWnd;
	TCHAR szWindowsClass[] = L"窗口示例";
	TCHAR szTitle[] = L"模拟时钟";

	wcex.cbClsExtra = 0;
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.cbWndExtra = 0;
	wcex.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcex.hInstance = hInstance;
	wcex.hIconSm = LoadCursor(wcex.hInstance, MAKEINTRESOURCE(IDI_ICON1));
	wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
	wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcex.lpfnWndProc = WndProc;
	wcex.lpszClassName = szWindowsClass;
	wcex.lpszMenuName = NULL;
	wcex.style = CS_HREDRAW | CS_VREDRAW;

	//注册窗口类
	if (!RegisterClassEx(&wcex))
	{
		return FALSE;
	}

	//hWnd = CreateWindowEx(0,szWindowsClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
	hWnd = CreateWindowEx(0,szWindowsClass, szTitle, WS_OVERLAPPEDWINDOW, 200, 200, 600, 400, NULL, NULL, hInstance, NULL);
	if (!hWnd)
		return FALSE;

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	return TRUE;

}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC hDc;
	PAINTSTRUCT ps;
	HBRUSH hBrush;
	HPEN hPen;
	RECT clientRect;
	SYSTEMTIME x;
	float sita = 0; 
	double  rSec, rMin, rHour,temHour,temMin, xOrg, yOrg, rClock, ptLong, xBegin, xEnd, yBegin, yEnd;

	//消息分发
	switch (message)
	{
	case WM_CREATE:
		SetTimer(hWnd, 9999, 1000, NULL);
		break;
	case WM_PAINT:
		hDc = BeginPaint(hWnd, &ps);
		GetClientRect(hWnd, &clientRect);//获取窗口大小

		hPen = (HPEN)GetStockObject(BLACK_PEN);
		hBrush = CreateSolidBrush(RGB(255, 220, 220));
		SelectObject(hDc, hPen);
		SelectObject(hDc, hBrush);

		//时钟表盘圆点坐标
		xOrg = (clientRect.left + clientRect.right) / 2;
		yOrg = (clientRect.bottom + clientRect.top) / 2;

		//表盘,秒,分,时针半径
		rClock = min(xOrg, yOrg) * 4 / 5;
		rSec = rClock * 6 / 7;
		rMin = rClock * 5 / 6;
		rHour = rClock * 2 / 3;

		//画圆盘
		Ellipse(hDc, int(xOrg - rClock), int(yOrg - rClock), int(xOrg + rClock), int(yOrg + rClock));
		
		//画刻度
		for (int i = 0; i = 12 && x.wMinute24 && x.wMinute36 && x.wMinute 48 && x.wMinute
		temMin =(double)(x.wMinute) / 60;//把分转换成小时的十进制,也就是30分钟->0.5小时
		temHour = x.wHour + temMin;		//把时针换面十进制时间,1:30->1.5小时


//这么设定时针的时间3:30就不是3了,改成3.5了,这么一来时针在表盘上就会在两个小时的刻度的中间
//而不是只指到3的刻度一个小时不变<_>;


		sita = float(2 * PI*temHour / 12);
		//时针起止点
		xBegin = xOrg + (double)(rHour*sin(sita));
		yBegin = yOrg - (double)(rHour*cos(sita));
		xEnd = xOrg + (double)(rClock*sin(sita + PI) / 8);
		yEnd = yOrg - (double)(rClock*cos(sita + PI) / 8);

		MoveToEx(hDc, (int)xBegin, (int)yBegin, NULL);
		LineTo(hDc, (int)xEnd, (int)yEnd);

		DeleteObject(hPen);
		DeleteObject(hBrush);
		EndPaint(hWnd, &ps);
		break;
	case WM_TIMER:
		if (wParam == 9999)
			InvalidateRect(hWnd, NULL, true);
		break;
	case WM_SIZE:
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return ::DefWindowProc(hWnd, message, wParam, lParam);
	}



	return 0;
}