D2D1路径几何：相交图形的行为

以下是一个使用D2D1路径几何的示例代码，展示了两个相交的图形的行为。

#include <Windows.h>
#include <d2d1.h>

#pragma comment(lib, "d2d1")

// 定义窗口尺寸
const int WINDOW_WIDTH = 800;
const int WINDOW_HEIGHT = 600;

// D2D1渲染器和工厂
ID2D1Factory* pFactory = NULL;
ID2D1HwndRenderTarget* pRenderTarget = NULL;

// 初始化D2D1渲染器和工厂
HRESULT InitializeD2D(HWND hWnd)
{
    HRESULT hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pFactory);
    if (FAILED(hr)) {
        return hr;
    }

    RECT rc;
    GetClientRect(hWnd, &rc);

    hr = pFactory->CreateHwndRenderTarget(
        D2D1::RenderTargetProperties(),
        D2D1::HwndRenderTargetProperties(hWnd, D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top)),
        &pRenderTarget
    );
    if (FAILED(hr)) {
        return hr;
    }

    return S_OK;
}

// 渲染D2D图形
void Render()
{
    pRenderTarget->BeginDraw();
    pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));

    // 创建路径几何
    ID2D1PathGeometry* pPathGeometry = NULL;
    HRESULT hr = pFactory->CreatePathGeometry(&pPathGeometry);
    if (SUCCEEDED(hr)) {
        ID2D1GeometrySink* pSink = NULL;
        hr = pPathGeometry->Open(&pSink);
        if (SUCCEEDED(hr)) {
            pSink->BeginFigure(D2D1::Point2F(100, 100), D2D1_FIGURE_BEGIN_FILLED);
            pSink->AddLine(D2D1::Point2F(300, 100));
            pSink->AddLine(D2D1::Point2F(300, 300));
            pSink->AddLine(D2D1::Point2F(100, 300));
            pSink->AddLine(D2D1::Point2F(100, 100));
            pSink->EndFigure(D2D1_FIGURE_END_CLOSED);
            pSink->Close();
            pSink->Release();
        }
    }

    // 创建第二个路径几何
    ID2D1PathGeometry* pPathGeometry2 = NULL;
    hr = pFactory->CreatePathGeometry(&pPathGeometry2);
    if (SUCCEEDED(hr)) {
        ID2D1GeometrySink* pSink = NULL;
        hr = pPathGeometry2->Open(&pSink);
        if (SUCCEEDED(hr)) {
            pSink->BeginFigure(D2D1::Point2F(200, 200), D2D1_FIGURE_BEGIN_FILLED);
            pSink->AddLine(D2D1::Point2F(400, 200));
            pSink->AddLine(D2D1::Point2F(400, 400));
            pSink->AddLine(D2D1::Point2F(200, 400));
            pSink->AddLine(D2D1::Point2F(200, 200));
            pSink->EndFigure(D2D1_FIGURE_END_CLOSED);
            pSink->Close();
            pSink->Release();
        }
    }

    // 绘制路径几何
    pRenderTarget->DrawGeometry(pPathGeometry, NULL, NULL);
    pRenderTarget->DrawGeometry(pPathGeometry2, NULL, NULL);

    pRenderTarget->EndDraw();
}

// 清理D2D1资源
void CleanupD2D()
{
    if (pRenderTarget) {
        pRenderTarget->Release();
        pRenderTarget = NULL;
    }
    if (pFactory) {
        pFactory->Release();
        pFactory = NULL;
    }
}

// 窗口过程
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        if (FAILED(InitializeD2D(hWnd))) {
            MessageBox(hWnd, L"无法初始化D2D1", L"错误", MB_OK | MB_ICONERROR);
            return -1;
        }
        break;
    case WM_PAINT:
        Render();
        ValidateRect(hWnd, NULL);
        break;
    case WM_DESTROY:
        CleanupD2D();
        PostQuitMessage(0);
        break;