#include <Windows.h>
#include <strsafe.h>
#include "SysMets.h"
#include <math.h>

#define NUM 1000
#define TWOPI (2 * 3.14159)
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nShowCmd) {
    static TCHAR szAppName[] = TEXT("Bill");
    HWND hwnd;
    WNDCLASS wndclass;
    MSG msg;
    
    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.lpszClassName = szAppName;
    wndclass.lpszMenuName = NULL;
    wndclass.lpfnWndProc = WndProc;
    wndclass.style = CS_HREDRAW | CS_VREDRAW;

    RegisterClass(&wndclass);
    hwnd = CreateWindow(TEXT("Bill"), TEXT("Tip"), WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,
        CW_USEDEFAULT, 40, CW_USEDEFAULT, 100,
        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, nShowCmd);
    UpdateWindow(hwnd);
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
    WPARAM wParam, LPARAM lParam) {
    HDC hdc;
    static int cxClient, cyClient;
    int i;
    PAINTSTRUCT ps;
    static POINT apt[4];
    
    switch (message) {
    case WM_CREATE:
        return 0;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        Rectangle(hdc, cxClient / 8, cyClient / 8, 7 * cxClient / 8, 7 * cyClient / 8);
        MoveToEx(hdc,0,0,NULL);
        LineTo(hdc, cxClient, cyClient);
        MoveToEx(hdc, cxClient, 0, NULL);
        LineTo(hdc, 0, cyClient);
        Ellipse(hdc, cxClient / 8, cyClient / 8, 7 * cxClient / 8, 7 * cyClient / 8);
        RoundRect(hdc, cxClient / 4, cyClient / 4, 3 * cxClient / 4, 3 * cyClient / 4, 60, 60);
        EndPaint(hwnd, &ps);
        return 0;
    case WM_SIZE:
        cxClient = LOWORD(lParam);
        cyClient = HIWORD(lParam);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
}

结果图

Result.png