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| /*
有 dpi 感知
*/
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <d2d1.h>
// #include "main.h"
#define SAFE_RELEASE(P) \
if (P) \
{ \
P->Release(); \
P = NULL; \
}
// 这是资源的声明
ID2D1Factory *g_pD2DFactory = NULL; // Direct2D factory
ID2D1HwndRenderTarget *g_pRenderTarget = NULL; // Render target
ID2D1SolidColorBrush *g_pBlackBrush = NULL; // A black brush, reflect the line color
ID2D1SolidColorBrush *g_pRedBrush = NULL; // A red brush, reflect the line color
VOID CreateD2DResource(HWND hWnd)
{
if (!g_pRenderTarget)
{
HRESULT hr;
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_pD2DFactory);
if (FAILED(hr))
{
MessageBox(hWnd, L"Create D2D factory failed!", L"Error", 0);
return;
}
// Obtain the size of the drawing area
RECT rc; // Render area
GetClientRect(hWnd, &rc);
// Create a Direct2D render target
hr = g_pD2DFactory->CreateHwndRenderTarget(
D2D1::RenderTargetProperties(),
D2D1::HwndRenderTargetProperties(
hWnd,
D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top)),
&g_pRenderTarget);
if (FAILED(hr))
{
MessageBox(hWnd, L"Create render target failed!", L"Error", 0);
return;
}
// Create a black brush
hr = g_pRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Black), &g_pBlackBrush);
// fany: Create a red brush
g_pRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Red), &g_pRedBrush);
if (FAILED(hr))
{
MessageBox(hWnd, L"Create brush failed!", L"Error", 0);
return;
}
}
}
VOID DrawRectangle(HWND hwnd)
{
CreateD2DResource(hwnd);
g_pRenderTarget->BeginDraw();
// Clear background color to White
g_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
// Draw Black Rectangle
// g_pRenderTarget->DrawRectangle(D2D1::RectF(100.f, 100.f, 500.f, 500.f), g_pBlackBrush);
// fany: Draw Red Rectangle
g_pRenderTarget->DrawRectangle(D2D1::RectF(100.f, 100.f, 500.f, 500.f), g_pRedBrush);
HRESULT hr = g_pRenderTarget->EndDraw();
if (FAILED(hr))
{
MessageBox(NULL, L"Draw failed!", L"Error", 0);
return;
}
}
VOID Cleanup()
{
SAFE_RELEASE(g_pRenderTarget);
SAFE_RELEASE(g_pBlackBrush);
SAFE_RELEASE(g_pD2DFactory);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_PAINT:
DrawRectangle(hwnd);
return 0;
case WM_KEYDOWN:
{
switch (wParam)
{
case VK_ESCAPE:
SendMessage(hwnd, WM_CLOSE, 0, 0);
break;
default:
break;
}
}
break;
case WM_DESTROY:
Cleanup();
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
WNDCLASSEX winClass;
winClass.lpszClassName = L"Direct2D";
winClass.cbSize = sizeof(WNDCLASSEX);
winClass.style = CS_HREDRAW | CS_VREDRAW;
winClass.lpfnWndProc = WndProc;
winClass.hInstance = hInstance;
winClass.hIcon = NULL;
winClass.hIconSm = NULL;
winClass.hCursor = LoadCursor(NULL, IDC_ARROW);
winClass.hbrBackground = NULL;
winClass.lpszMenuName = NULL;
winClass.cbClsExtra = 0;
winClass.cbWndExtra = 0;
if (!RegisterClassEx(&winClass))
{
MessageBox(NULL, TEXT("This program requires Windows NT!"), L"error", MB_ICONERROR);
return 0;
}
HWND hwnd = CreateWindowEx(NULL,
L"Direct2D", // window class name
L"Draw Rectangle", // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
938, // initial x size
1000, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
MSG msg;
ZeroMemory(&msg, sizeof(msg));
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
|