原文:Direct2D 第2篇 绘制椭圆
#include <windows.h> #include <d2d1.h> #include <d2d1helper.h> #include <dwrite.h> #pragma comment(lib, "dwrite.lib") #pragma comment(lib, "d2d1.lib") HINSTANCE g_hinst; HWND g_hwnd; ID2D1Factory * g_factory; ID2D1HwndRenderTarget * g_render_target; ID2D1SolidColorBrush * g_brush; void OnSize(LPARAM lparam) { if(g_render_target) g_render_target->Resize(D2D1::SizeU(LOWORD(lparam),HIWORD(lparam))); } bool AppInit() { D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_factory); RECT rc; GetClientRect(g_hwnd, &rc); g_factory->CreateHwndRenderTarget( D2D1::RenderTargetProperties(), D2D1::HwndRenderTargetProperties(g_hwnd, D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top) ), &g_render_target); g_render_target->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::ForestGreen), &g_brush); return true; } void OnPaint() { if(!g_render_target) return; g_render_target->BeginDraw(); // Clear Background g_render_target->Clear(D2D1::ColorF(0.63, 0.84, 0.00)); // Draw Ellipse D2D1_SIZE_F size = g_render_target->GetSize(); D2D1_ELLIPSE ellipse; ellipse.point = D2D1::Point2F(size.width/2.0, size.height/2.0); ellipse.radiusX = 200; ellipse.radiusY =100; g_render_target->FillEllipse(&ellipse, g_brush);//绘制图形 g_render_target->EndDraw(); } void OnDestroy() { g_brush->Release(); g_render_target->Release(); g_factory->Release(); } LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) { switch(msg) { case WM_PAINT: OnPaint(); break; case WM_SIZE: OnSize(lparam); break; case WM_DESTROY: OnDestroy(); PostQuitMessage(0); break; default: return DefWindowProc(hwnd, msg, wparam, lparam); } return 0; } int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { WNDCLASSEX wc; MSG msg; memset(&wc,0,sizeof(wc)); wc.cbSize = sizeof(WNDCLASSEX); wc.lpfnWndProc = WndProc; wc.hInstance = hinst; wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wc.lpszClassName = "WindowClass"; wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); if(!RegisterClassEx(&wc)) { MessageBox(NULL, "Window Registration Failed!","Error!",MB_ICONEXCLAMATION|MB_OK); return 0; } g_hinst = hinst; g_hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"WindowClass","Direct2D Demo",WS_VISIBLE|WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hinst, NULL); if(g_hwnd == NULL) { MessageBox(NULL, "Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK); return 0; } if(!AppInit()) { MessageBox(NULL, "Application Initialisation Failed !","Error",MB_ICONEXCLAMATION|MB_OK); return 0; } while(GetMessage(&msg, NULL, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; }
来源:https://www.cnblogs.com/lonelyxmas/p/10823166.html