使用Direct2D在DirectWrite中围绕图像或抽象形状包装文本的方法如下:
下面是一个示例代码:
#include <d2d1.h>
#include <dwrite.h>
ID2D1Factory* pD2DFactory = nullptr;
IDWriteFactory* pDWriteFactory = nullptr;
ID2D1HwndRenderTarget* pRenderTarget = nullptr;
IDWriteTextFormat* pTextFormat = nullptr;
IDWriteTextLayout* pTextLayout = nullptr;
// 初始化Direct2D和DirectWrite
void InitializeD2D(HWND hWnd)
{
// 创建D2D工厂
D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory);
// 创建DWrite工厂
DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory), reinterpret_cast<IUnknown**>(&pDWriteFactory));
// 创建渲染目标
D2D1_RENDER_TARGET_PROPERTIES props = D2D1::RenderTargetProperties();
props.usage = D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE;
pD2DFactory->CreateHwndRenderTarget(props, D2D1::HwndRenderTargetProperties(hWnd, D2D1::SizeU(800, 600)), &pRenderTarget);
// 创建文本格式
pDWriteFactory->CreateTextFormat(L"Arial", nullptr, DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL, 16.0f, L"", &pTextFormat);
// 创建文本布局
pDWriteFactory->CreateTextLayout(L"Hello, World!", 13, pTextFormat, 800, 600, &pTextLayout);
}
// 绘制文本
void DrawText()
{
// 设置绘制效果
ID2D1Effect* pEffect = nullptr;
pRenderTarget->CreateEffect(CLSID_D2D1BitmapSource, &pEffect);
pTextLayout->SetDrawingEffect(pEffect, DWRITE_TEXT_RANGE{ 0, 13 });
// 绘制文本布局
pRenderTarget->BeginDraw();
pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
pRenderTarget->DrawTextLayout(D2D1::Point2F(0, 0), pTextLayout, pTextFormat, D2D1::ColorF(D2D1::ColorF::Black));
pRenderTarget->EndDraw();
}
// 释放资源
void Cleanup()
{
if (pD2DFactory) pD2DFactory->Release();
if (pDWriteFactory) pDWriteFactory->Release();
if (pRenderTarget) pRenderTarget->Release();
if (pTextFormat) pTextFormat->Release();
if (pTextLayout) pTextLayout->Release();
}
// 窗口过程
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_PAINT:
DrawText();
ValidateRect(hWnd, nullptr);
break;
case WM_DESTROY:
Cleanup();
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// 程序入口
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// 创建窗口
HWND hWnd;
WNDCLASSEX wcex;
ZeroMemory(&wcex, sizeof(WNDCLASSEX));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.hInstance = hInstance;
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.lpszClassName = L"Direct2DWindow";
RegisterClassEx(&wcex);
hWnd = CreateWindow(L"Direct2DWindow", L"Direct2D Window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, nullptr, nullptr, hInstance, nullptr);
// 初始化Direct2D和DirectWrite
InitializeD2D(hWnd);
// 显示窗口
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
// 消息循环
MSG msg;
while (GetMessage(&msg, nullptr, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}
这是一个使用Direct2D在DirectWrite中围绕图像或抽象形状包装文本的基本示例。你可以根据自己的需求进行修改和扩展。
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