Direct2D绘制多种风格的线条

#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; static bool g_flag_app_exit; ID2D1Factory * g_factory; ID2D1HwndRenderTarget * g_render_target; ID2D1SolidColorBrush * g_brush; ID2D1StrokeStyle * g_stroke_style_list[5]; #define SafeRelease(p) if(p){p->Release(); p = NULL;} 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(1.0f, 1.0f, 1.0f), &g_brush); for(int i=0; i<5; i++) { g_factory->CreateStrokeStyle(D2D1::StrokeStyleProperties( D2D1_CAP_STYLE_TRIANGLE, D2D1_CAP_STYLE_ROUND, D2D1_CAP_STYLE_ROUND, D2D1_LINE_JOIN_MITER, 1.0f, (D2D1_DASH_STYLE)i, 10.0f), NULL, 0, &(g_stroke_style_list[i])); } return true; } void OnPaint() { if(!g_render_target) return; g_render_target->BeginDraw(); g_render_target->Clear(D2D1::ColorF(0.12f, 0.12f, 0.12f)); const int OFFY = 50.0f; D2D1_POINT_2F p1 = {20.0f, 40.0f}; D2D1_POINT_2F p2 = {600.0f, 40.0f}; for(int i=0; i<5; i++) { g_render_target->DrawLine(p1, p2, g_brush, 8.0f, g_stroke_style_list[i]); p1.y += OFFY; p2.y += OFFY; } g_render_target->EndDraw(); } void AppShutdown() { //MessageBox(NULL, "Released","Message!", MB_OK); for(int i=0; i<5; i++) { SafeRelease(g_stroke_style_list[i]); } SafeRelease(g_brush); SafeRelease(g_render_target); SafeRelease(g_factory); } 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_CLOSE: g_flag_app_exit = true; return 1; 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, "Failed to create window !","Error!",MB_ICONEXCLAMATION|MB_OK); return 0; } if(!AppInit()) { MessageBox(NULL, "Failed to initialize application !","Error",MB_ICONEXCLAMATION|MB_OK); return 0; } while(!g_flag_app_exit) { if(PeekMessage(&msg, g_hwnd, 0, 0, PM_REMOVE)) { if(msg.message == WM_QUIT) break; TranslateMessage(&msg); DispatchMessage(&msg); } } AppShutdown(); return msg.wParam; }