其实就是个椭圆。

效果图：

代码

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<easyx.h>
#include<math.h>
#include<time.h>
#include<mmsystem.h>
#include<chrono>

#pragma comment(lib, "winmm.lib")

using namespace std;

ExMessage msg = { 0 };
bool inArea(int mx, int my, int x, int y, int w, int h)
{
    return mx >= x && mx <= x + w && my >= y && my <= y + h;
}
bool button(int x, int y, int w, int h, const char* text)
{
    if (inArea(msg.x, msg.y, x, y, w, h))
        setfillcolor(RGB(93, 107, 153));
    else
        setfillcolor(RGB(230, 231, 232));
    fillroundrect(x, y, x + w, y + h, 5, 5);
    int hSpace = (w - textwidth(text)) / 2;
    int vSpace = (h - textheight(text)) / 2;
    outtextxy(x + hSpace, y + vSpace, text);

    if (msg.message == WM_LBUTTONDOWN && inArea(msg.x, msg.y, x, y, w, h))
    {
        return true;
    }
    return false;
}
int main()
{

    initgraph(800, 600);

    setbkcolor(WHITE);
    cleardevice();

    setbkmode(TRANSPARENT);
    settextcolor(BLACK);
    while (true)
    {
        peekmessage(&msg, EX_MOUSE | EX_KEY);
        if (msg.message == WM_KEYDOWN)
        {
            if (msg.vkcode == VK_ESCAPE)
                return 0;
        }
        BeginBatchDraw();
        if (button(300, 200, 200, 50, "开始旋转炸鸡块"))
            break;
        if (button(300, 300, 200, 50, "按ESC键退出"))
            return 0;
        EndBatchDraw();
    }


    auto start_time = chrono::high_resolution_clock::now();

    mciSendString("open static/FunkyTown.mp3 alias BGM", NULL, 0, NULL);
    mciSendString("play BGM repeat", NULL, 0, NULL);

    setbkcolor(WHITE);
    cleardevice();

    setfillcolor(YELLOW);
    int left, top, right, bottom;
    while (true)
    {
        peekmessage(&msg, EX_MOUSE | EX_KEY);
        if (msg.message == WM_KEYDOWN)
        {
            if (msg.vkcode == VK_ESCAPE)
                break;
        }
        cleardevice();
        clock_t t1 = clock();
        top = 200 + 25 * sin(t1);
        bottom = 400 + 25 * sin(t1);
        clock_t t2 = clock();
        left = min(400 + 50 * sin(t2), 400 - 50 * sin(t2));
        right = max(400 + 50 * sin(t2), 400 - 50 * sin(t2));
        BeginBatchDraw();
        auto now_time = chrono::high_resolution_clock::now();
        auto duration = chrono::duration_cast<chrono::milliseconds>(now_time - start_time);
        char str[100];
        int hour = duration.count() / 1000 / 60 / 60;
        int minute = duration.count() / 1000 / 60 % 60;
        int second = duration.count() / 1000 % 60;
        sprintf(str, "%02d:%02d:%02d", hour, minute, second);
        settextcolor(BLACK);
        outtextxy(10, 10, str);
        solidellipse(left, top, right, bottom);
        EndBatchDraw();

    }
    mciSendString("close BGM", NULL, 0, NULL);
    closegraph();

    return 0;
}