用Direct2D绘制一个矩形

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我是靠谱客的博主大方大象，最近开发中收集的这篇文章主要介绍用Direct2D绘制一个矩形，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

请注意在项目->属性中设置包含目录和库目录

#include <Windows.h>
#include <d2d1.h>
#pragma comment(lib,"d2d1.lib")
#define SAFE_RELEASE(p) { if (p) { (p)->Release(); (p) = NULL; } }
#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600
ID2D1Factory* g_pd2dFac = NULL;
ID2D1HwndRenderTarget* g_pRenderTarget = NULL;
ID2D1SolidColorBrush* g_pBlackBrush = NULL;
HRESULT D2D_Init(HWND);
void D2D_Paint(HWND);
void D2D_CleanUp();
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
   static TCHAR szAppName[] = TEXT("D2DDrawTest");
   HWND hwnd;
   MSG msg = { 0 };
   WNDCLASSEX wndclass = { 0 };
   wndclass.cbSize = sizeof(WNDCLASSEX);
   wndclass.lpfnWndProc = WndProc;
   wndclass.hInstance = hInstance;
   wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
   wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
   wndclass.lpszMenuName = NULL;
   wndclass.lpszClassName = szAppName;
   wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
   wndclass.cbClsExtra = 0;
   wndclass.cbWndExtra = 0;
   wndclass.style = CS_VREDRAW | CS_HREDRAW;
   if (!RegisterClassEx(&wndclass)) {
       return -1;
   }
   hwnd = CreateWindow(szAppName, TEXT("D2DDrawTest"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, hInstance, NULL);
   if (FAILED(D2D_Init(hwnd))) {
       return -1;
   }
   MoveWindow(hwnd, 250, 80, WINDOW_WIDTH, WINDOW_HEIGHT, TRUE);
   ShowWindow(hwnd, iCmdShow);
   UpdateWindow(hwnd);
   while (msg.message != WM_QUIT) {
       if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
           TranslateMessage(&msg);
           DispatchMessage(&msg);
       }
   }
   UnregisterClass(szAppName, wndclass.hInstance);
   return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
   switch (message) {
   case WM_PAINT:
       D2D_Paint(hwnd);
       ValidateRect(hwnd, NULL);
       break;
   case WM_KEYDOWN:
       if (wParam == VK_ESCAPE)
           DestroyWindow(hwnd);
       break;
   case WM_DESTROY:
       D2D_CleanUp();
       PostQuitMessage(0);
       break;
   default:
       return DefWindowProc(hwnd, message, wParam, lParam);
   }
   return 0;
}
void D2D_Paint(HWND hwnd) {
   g_pRenderTarget->BeginDraw();
   g_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
   g_pRenderTarget->DrawRectangle(D2D1::Rect(100.f, 100.f, 700.f, 500.f), g_pBlackBrush);
   g_pRenderTarget->EndDraw();
}
HRESULT D2D_Init(HWND hwnd) {
   if (FAILED(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_pd2dFac))) {
       return E_FAIL;
   }
   RECT rc;
   GetClientRect(hwnd, &rc);
   if (FAILED(g_pd2dFac->CreateHwndRenderTarget(D2D1::RenderTargetProperties(),
       D2D1::HwndRenderTargetProperties(hwnd, D2D1::SizeU(WINDOW_WIDTH, WINDOW_HEIGHT)), &g_pRenderTarget))) {
       return E_FAIL;
   }
   if (FAILED(g_pRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Black), &g_pBlackBrush))) {
       return E_FAIL;
   }
   return S_OK;
}
void D2D_CleanUp() {
   SAFE_RELEASE(g_pBlackBrush)
       SAFE_RELEASE(g_pRenderTarget)
       SAFE_RELEASE(g_pd2dFac)
}