#include <Windows.h>
#include <math.h>
//常量定义
const int CLOCK_SIZE = 200; //钟表的直径
const DOUBLE TWOPI = 2 * 3.1415926;
//函数申明，窗口过程
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
VOID DrawDots(HDC hdc);
VOID DrawLine(HDC hdc, int nAngle, int nRadiusAdjust);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wndclass;
TCHAR szClassName[] = TEXT("MyWindow");
TCHAR szAppName[] = TEXT("Clock");
HWND hwnd;
MSG msg;
wndclass.cbSize = sizeof(WNDCLASSEX);
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WindowProc;
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 = szClassName;
wndclass.hIconSm = NULL;
RegisterClassEx(&wndclass);
hwnd = CreateWindowEx(0, szClassName, szAppName, WS_POPUP | WS_SYSMENU, 200, 100, CLOCK_SIZE, CLOCK_SIZE, NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0) != 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
HRGN hRgn;
SYSTEMTIME st;
switch (uMsg)
{
case WM_CREATE:
//创建椭圆裁剪区域
hRgn = CreateEllipticRgn(0, 0, CLOCK_SIZE, CLOCK_SIZE);
SetWindowRgn(hwnd, hRgn, TRUE);
//设置为总在最前
SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
//创建计时器
SetTimer(hwnd, 1, 1000, NULL);
return 0;
case WM_TIMER:
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case WM_LBUTTONDOWN:
//按住鼠标左键可以拖动窗口
SetCursor(LoadCursor(NULL, IDC_HAND));
SendMessage(hwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0);
SetCursor(LoadCursor(NULL, IDC_ARROW));
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetLocalTime(&st);
//画点
SelectObject(hdc, GetStockObject(BLACK_BRUSH));
DrawDots(hdc);
//画秒针、分针、时针
SelectObject(hdc, CreatePen(PS_SOLID, 1, RGB(0, 0, 0)));
DrawLine(hdc, st.wSecond * 6, 10); //秒针，秒针度数 = 秒 * 6
DeleteObject(SelectObject(hdc, CreatePen(PS_SOLID, 2, RGB(0, 0, 0))));
DrawLine(hdc, st.wMinute * 6, 20); //分针，分针度数 = 分 * 6
DeleteObject(SelectObject(hdc, CreatePen(PS_SOLID, 3, RGB(0, 0, 0)))); //时针，时针度数 = 时 * 30 + 分 / 2
DrawLine(hdc, (st.wHour % 12) * 30 + st.wMinute / 2, 30);
DeleteObject(SelectObject(hdc, GetStockObject(BLACK_PEN)));
SelectObject(hdc, GetStockObject(WHITE_BRUSH));
EndPaint(hwnd, &ps);
return 0;
case WM_CHAR:
switch (wParam)
{
case '1': //更换窗口背景
SetClassLongPtr(hwnd, GCLP_HBRBACKGROUND, (LONG)CreatePatternBrush((HBITMAP)LoadImage(NULL, TEXT("Back1.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE)));
InvalidateRect(hwnd, NULL, TRUE);
break;
case '2': //更换窗口背景
SetClassLongPtr(hwnd, GCLP_HBRBACKGROUND, (LONG)CreatePatternBrush((HBITMAP)LoadImage(NULL, TEXT("Back2.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE)));
InvalidateRect(hwnd, NULL, TRUE);
break;
case 0x1B: //Esc
SendMessage(hwnd, WM_CLOSE, 0, 0);
break;
}
return 0;
case WM_DESTROY:
KillTimer(hwnd, 1);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
VOID DrawDots(HDC hdc)
{
int x, y;
int nRadius;
for (int nAngle = 0; nAngle < 360; nAngle += 6)
{
x = CLOCK_SIZE / 2 + (int)((CLOCK_SIZE / 2 - 4) * sin(TWOPI * nAngle / 360));
y = CLOCK_SIZE / 2 - (int)((CLOCK_SIZE / 2 - 4) * cos(TWOPI * nAngle / 360));
//每隔30度画大圆，小时的圆点；每隔6度画小圆，分钟的圆点
nRadius = nAngle % 5 ? 2 : 4;
Ellipse(hdc, x - nRadius, y - nRadius, x + nRadius, y + nRadius);
}
}
VOID DrawLine(HDC hdc, int nAngle, int nRadiusAdjust)
{
int x1, y1, x2, y2;
x1 = CLOCK_SIZE / 2 + (int)(((CLOCK_SIZE / 2 - 4) - 4) - nRadiusAdjust) * sin(TWOPI * nAngle / 360);
y1 = CLOCK_SIZE / 2 - (int)(((CLOCK_SIZE / 2 - 4) - 4) - nRadiusAdjust) * cos(TWOPI * nAngle / 360);
x2 = CLOCK_SIZE / 2 + (int)(10 * sin(TWOPI * ((DOUBLE)nAngle + 180) / 360));
y2 = CLOCK_SIZE / 2 - (int)(10 * cos(TWOPI * ((DOUBLE)nAngle + 180) / 360));
MoveToEx(hdc, x1, y1, NULL);
LineTo(hdc, x2, y2);
}
最新发布
本文深入探讨了MFC中OnSetCursor函数的使用，详细解释了pWnd、nHitTest和message参数的作用，并展示了如何在IDE中获取nHitTest的可用值。同时介绍了winuser.h头文件中定义的消息类型，为开发者提供了丰富的参考信息。
扫一扫
795
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
