在Dev-C++软件中用c语言代码实现拥塞控制算法仿真动画

好的，以下是在 Dev-C++ 软件中用 C 语言代码实现拥塞控制算法仿真动画的示例程序。该程序使用了 Win32 API 中的 GDI+ 绘图库来绘制动画界面。

#include <stdio.h>
#include <windows.h>
#include <gdiplus.h>

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

#define ID_TIMER 1  // 定时器 ID
#define WIN_WIDTH 800  // 窗口宽度
#define WIN_HEIGHT 600  // 窗口高度
#define RECT_WIDTH 20  // 拥塞窗口矩形宽度
#define RECT_HEIGHT 20  // 拥塞窗口矩形高度
#define RECT_SPACING 5  // 拥塞窗口矩形间距
#define SLOW_START_COLOR RGB(0, 128, 255)  // 慢启动阶段矩形颜色
#define CONGESTION_AVOIDANCE_COLOR RGB(255, 128, 0)  // 拥塞避免阶段矩形颜色
#define TIMEOUT_COLOR RGB(255, 0, 0)  // 超时阶段矩形颜色

int cwnd = 1;  // 拥塞窗口大小
int ssthresh = 16;  // 慢启动阈值
int rtt = 100;  // 往返时延
int state = 0;  // 状态：0-慢启动，1-拥塞避免，2-超时

void drawRect(Gdiplus::Graphics& graphics, int x, int y, int width, int height, COLORREF color);

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_CREATE:
        SetTimer(hwnd, ID_TIMER, rtt, NULL);
        break;
    case WM_TIMER:
        if (state == 2) {
            // 发生超时
            ssthresh = cwnd / 2;
            cwnd = 1;
            state = 0;
        } else if (cwnd >= ssthresh) {
            // 进入拥塞避免状态
            state = 1;
            cwnd += 1;
        } else {
            // 进入慢启动状态
            state = 0;
            cwnd *= 2;
        }
        InvalidateRect(hwnd, NULL, TRUE);
        break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);
            Gdiplus::Graphics graphics(hdc);

            int x = (WIN_WIDTH - cwnd * (RECT_WIDTH + RECT_SPACING)) / 2;
            int y = (WIN_HEIGHT - RECT_HEIGHT) / 2;
            int i;
            for (i = 0; i < cwnd; i++) {
                if (i < ssthresh) {
                    drawRect(graphics, x + i * (RECT_WIDTH + RECT_SPACING), y, RECT_WIDTH, RECT_HEIGHT, SLOW_START_COLOR);
                } else {
                    drawRect(graphics, x + i * (RECT_WIDTH + RECT_SPACING), y, RECT_WIDTH, RECT_HEIGHT, CONGESTION_AVOIDANCE_COLOR);
                }
            }

            if (state == 2) {
                drawRect(graphics, x + (cwnd - 1) * (RECT_WIDTH + RECT_SPACING), y, RECT_WIDTH, RECT_HEIGHT, TIMEOUT_COLOR);
            }

            EndPaint(hwnd, &ps);
        }
        break;
    case WM_DESTROY:
        KillTimer(hwnd, ID_TIMER);
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

void drawRect(Gdiplus::Graphics& graphics, int x, int y, int width, int height, COLORREF color)
{
    Gdiplus::SolidBrush brush(color);
    Gdiplus::Rect rect(x, y, width, height);
    graphics.FillRectangle(&brush, rect);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    Gdiplus::GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    WNDCLASS wc;
    HWND hwnd;
    MSG msg;

    // 注册窗口类
    ZeroMemory(&wc, sizeof wc);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hInstance = hInstance;
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = "MyWindowClass";
    wc.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wc);

    // 创建窗口
    hwnd = CreateWindow("MyWindowClass", "TCP Congestion Control Animation", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, WIN_WIDTH, WIN_HEIGHT, NULL, NULL, hInstance, NULL);
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // 消息循环
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    Gdiplus::GdiplusShutdown(gdiplusToken);

    return (int)msg.wParam;
}

运行该程序后，会弹出一个窗口，其中会显示一个拥塞窗口的仿真动画。程序会定时更新拥塞窗口的大小，并根据当前状态绘制不同颜色的矩形来表示不同阶段。可以通过修改程序中的参数来调整拥塞控制算法的参数和动画效果。