vc++七彩气球

如果你想在VC++中实现七彩气球，你可以使用GDI+来绘制图形。下面是一个简单的例子，可以在窗体上绘制一个七彩气球：

#include <windows.h>
#include <gdiplus.h>
#pragma comment(lib, "gdiplus.lib")

using namespace Gdiplus;

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);

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

    WNDCLASS wc = { 0 };
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = L"WindowClass";
    RegisterClass(&wc);

    HWND hwnd = CreateWindow(L"WindowClass", L"七彩气球", WS_OVERLAPPEDWINDOW, 100, 100, 500, 500, NULL, NULL, hInstance, NULL);
    if (hwnd == NULL)
        return 0;

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

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

    GdiplusShutdown(gdiplusToken);
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);

        Graphics graphics(hdc);
        SolidBrush brush(Color::Red);
        graphics.FillEllipse(&brush, 200, 200, 100, 100);

        brush.SetColor(Color::Orange);
        graphics.FillEllipse(&brush, 220, 220, 60, 60);

        brush.SetColor(Color::Yellow);
        graphics.FillEllipse(&brush, 240, 240, 20, 20);

        brush.SetColor(Color::Green);
        graphics.FillEllipse(&brush, 244, 244, 12, 12);

        brush.SetColor(Color::Blue);
        graphics.FillEllipse(&brush, 248, 248, 6, 6);

        brush.SetColor(Color::Purple);
        graphics.FillEllipse(&brush, 250, 250, 2, 2);

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

这个例子使用了GDI+中的Graphics类和SolidBrush类来绘制七个不同颜色的圆形，从而形成了一个七彩气球的效果。