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2022.7.30

新版:(转 https://qa.codebus.cn/question/2260

#include <windows.h>
#include <graphics.h>
#include <conio.h>
#include <stdio.h>
#include <time.h>

bool change_size = false;

int change_size_width;
int change_size_height;

WNDPROC EasyXProcess;

LRESULT MyWindowProcess(HWND handle, UINT message, WPARAM wparam, LPARAM lparam) {
    switch (message) {
    case WM_SIZING: {
        RECT* rect = (RECT*)lparam;

        change_size = true;

        change_size_width = rect->right - rect->left - 18;
        change_size_height = rect->bottom - rect->top - 39;

        Resize(NULL, change_size_width, change_size_height);
        cleardevice();
        FlushBatchDraw();

        return 0;
    }
    }

    return EasyXProcess(handle, message, wparam, lparam);
}

int main() {
    initgraph(500, 300, SHOWCONSOLE);

    // 取消拖动改变大小限制
    SetWindowLong(GetHWnd(), GWL_STYLE, GetWindowLong(GetHWnd(), GWL_STYLE) | (WS_MAXIMIZEBOX));
    SetWindowLong(GetHWnd(), GWL_STYLE, (GetWindowLong(GetHWnd(), GWL_STYLE) | WS_THICKFRAME));

    EasyXProcess = reinterpret_cast<WNDPROC>(GetWindowLongPtr(GetHWnd(), GWLP_WNDPROC));

    SetWindowLongPtr(GetHWnd(), GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(MyWindowProcess));

    // 计时器
    time_t timer = clock();

    setbkcolor(RGB(41, 42, 43));

    BeginBatchDraw();

    cleardevice();
    FlushBatchDraw();

    while (true) {
        Sleep (10);
        //if (clock() - timer >= 38) {
        //    if (change_size == true) {
        //        change_size = false;

        //    //    Resize(NULL, change_size_width, change_size_height);

        //        cleardevice();
        //        FlushBatchDraw();
        //    }
        //}
    }

    EndBatchDraw();

    _getch();

    return 0;
}


旧版:

#include <graphics.h>
#include <conio.h>

static WNDPROC OldProc;
static WORD nWidth, nHeight;
static bool size_flag = false;

LRESULT CALLBACK NewProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_SIZE:
    {
        // 在EasyX默认的处理函数前先将窗口大小调整消息处理一次
        nWidth = LOWORD(lParam); // width of elient area
        nHeight = HIWORD(lParam); // height of client area
        size_flag = true;
    }
    default:
        return CallWindowProc(OldProc, hWnd, message, wParam, lParam);
    }
}

HWND new_graph_window(int width, int height)
{
    // 设置窗口样式,使窗口大小可调
    HWND graphwindow = initgraph(width, height);
    LONG oldstyle = GetWindowLong(graphwindow, GWL_STYLE);
    SetWindowLong(graphwindow, GWL_STYLE, oldstyle | WS_MAXIMIZEBOX | WS_SIZEBOX);
    OldProc = (WNDPROC)GetWindowLong(graphwindow, GWL_WNDPROC);
    SetWindowLong(graphwindow, GWL_WNDPROC, (LONG)NewProc);
    return graphwindow;
}

int main()
{
    new_graph_window(640,480);
    BeginBatchDraw();

    nWidth = getwidth();
    nHeight = getheight();

    setbkcolor(WHITE);
    setfillcolor(BLACK);
    setlinecolor(BLACK);
    while (true)
    {
        if (size_flag)
        {
            Resize(NULL,nWidth,nHeight);
            size_flag = false;
        }

        cleardevice();
        fillcircle(nWidth / 2, nHeight / 2, nWidth > nHeight ? nHeight / 2 : nWidth / 2);
        FlushBatchDraw();
    }

    return 0;
}



上述代码由如下帖吧稍加改动而成,可以直接编译运行。

https://tieba.baidu.com/p/6014139638?pid=123764910327&cid=0#123764910327 



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