使用中点Bresenham算法绘制任意斜率k的直线段，包括k＝±∞、k＞1、0≤k≤1、-1≤k＜0和k＜-1五种情况。中点Bresenham算法是一种基于判断的直线段扫描转换算法，可以高效地绘制直线段。用C++编程实现

下面是使用C++编写的中点Bresenham算法绘制任意斜率k的直线段的代码。其中，使用了Windows API的GDI函数来绘制直线段。

#include <Windows.h>

void DrawLine(HDC hdc, int x0, int y0, int x1, int y1)
{
    int dx = abs(x1 - x0);
    int dy = abs(y1 - y0);
    int sx = x0 < x1 ? 1 : -1;
    int sy = y0 < y1 ? 1 : -1;
    int err = dx - dy;
    int x = x0;
    int y = y0;

    while (true) {
        SetPixel(hdc, x, y, RGB(0, 0, 0));
        if (x == x1 && y == y1) {
            break;
        }
        int e2 = 2 * err;
        if (e2 > -dy) {
            err -= dy;
            x += sx;
        }
        if (e2 < dx) {
            err += dx;
            y += sy;
        }
    }
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static int x0, y0, x1, y1;
    switch (msg) {
    case WM_LBUTTONDOWN:
        x0 = LOWORD(lParam);
        y0 = HIWORD(lParam);
        break;
    case WM_LBUTTONUP:
        x1 = LOWORD(lParam);
        y1 = HIWORD(lParam);
        HDC hdc = GetDC(hWnd);
        DrawLine(hdc, x0, y0, x1, y1);
        ReleaseDC(hWnd, hdc);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    WNDCLASS wc = { 0 };
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = "MyWndClass";
    RegisterClass(&wc);

    HWND hWnd = CreateWindow("MyWndClass", "Bresenham Line Drawing", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hInstance, NULL);

    if (!hWnd) {
        return 1;
    }

    ShowWindow(hWnd, nShowCmd);
    UpdateWindow(hWnd);

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

在这个代码中，DrawLine函数使用了中点Bresenham算法来绘制直线段，其中x0、y0和x1、y1是直线段的起点和终点坐标。在WM_LBUTTONUP消息中调用DrawLine函数来绘制直线段。在WinMain函数中创建窗口并进入消息循环。