// windowsgdi.cpp : Defines the entry point for the application.//#include "stdafx.h"#include "windowsgdi.h"#define MAX_LOADSTRING 100// Global Variables:HINSTANCE hInst;// current instanceTCHAR szTitle[MAX_LOADSTRING];// The title bar textTCHAR szWindowClass[MAX_LOADSTRING];// the main window class name// Forward declarations of functions included in this code module:ATOMMyRegisterClass(HINSTANCE hInstance);BOOLInitInstance(HINSTANCE, int);LRESULT CALLBACKWndProc(HWND, UINT, WPARAM, LPARAM);INT_PTR CALLBACKAbout(HWND, UINT, WPARAM, LPARAM);int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow){UNREFERENCED_PARAMETER(hPrevInstance);UNREFERENCED_PARAMETER(lpCmdLine); // TODO: Place code here.MSG msg;HACCEL hAccelTable;// Initialize global stringsLoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);LoadString(hInstance, IDC_WINDOWSGDI, szWindowClass, MAX_LOADSTRING);MyRegisterClass(hInstance);// Perform application initialization:if (!InitInstance (hInstance, nCmdShow)){return FALSE;}hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINDOWSGDI));// Main message loop:while (GetMessage(&msg, NULL, 0, 0)){if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)){TranslateMessage(&msg);DispatchMessage(&msg);}}return (int) msg.wParam;}//// FUNCTION: MyRegisterClass()//// PURPOSE: Registers the window class.//// COMMENTS://// This function and its usage are only necessary if you want this code// to be compatible with Win32 systems prior to the 'RegisterClassEx'// function that was added to Windows 95. It is important to call this function// so that the application will get 'well formed' small icons associated// with it.//ATOM MyRegisterClass(HINSTANCE hInstance){WNDCLASSEX wcex;wcex.cbSize = sizeof(WNDCLASSEX);wcex.style= CS_HREDRAW | CS_VREDRAW;wcex.lpfnWndProc= WndProc;wcex.cbClsExtra= 0;wcex.cbWndExtra= 0;wcex.hInstance= hInstance;wcex.hIcon= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINDOWSGDI));wcex.hCursor= LoadCursor(NULL, IDC_ARROW);wcex.hbrBackground= (HBRUSH)(COLOR_WINDOW+1);wcex.lpszMenuName= MAKEINTRESOURCE(IDC_WINDOWSGDI);wcex.lpszClassName= szWindowClass;wcex.hIconSm= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));return RegisterClassEx(&wcex);}//// FUNCTION: InitInstance(HINSTANCE, int)//// PURPOSE: Saves instance handle and creates main window//// COMMENTS://// In this function, we save the instance handle in a global variable and// create and display the main program window.//BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){ HWND hWnd; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE;}//// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)//// PURPOSE: Processes messages for the main window.//// WM_COMMAND- process the application menu// WM_PAINT- Paint the main window// WM_DESTROY- post a quit message and return////void DrawBezier(HDC hdc, POINT b[]){PolyBezier(hdc,b,4);}LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){ static POINT b[4];int wmId, wmEvent;PAINTSTRUCT ps;HDC hdc;static int cxClient, cyClient;switch (message){case WM_SIZE:cxClient=LOWORD(lParam);cyClient=HIWORD(lParam);b[0].x=cxClient/4;b[0].y=cxClient/4;b[1].x=cxClient/7;b[1].y=cxClient/4;b[2].x=cxClient/3;b[2].y=cxClient/2;b[3].x=cxClient/6;b[3].y=cxClient/3;return 0;case WM_COMMAND:wmId = LOWORD(wParam);wmEvent = HIWORD(wParam);// Parse the menu selections:switch (wmId){case IDM_ABOUT:DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);break;case IDM_EXIT:DestroyWindow(hWnd);break;default:return DefWindowProc(hWnd, message, wParam, lParam);}break;case WM_LBUTTONDOWN:case WM_RBUTTONDOWN:case WM_MOUSEMOVE:if(wParam&MK_LBUTTON||wParam&MK_RBUTTON){ hdc=GetDC(hWnd);SelectObject (hdc, GetStockObject (WHITE_PEN)) ; DrawBezier (hdc, b) ;if (wParam & MK_LBUTTON){b[1].x=LOWORD(lParam); b[1].y=HIWORD(lParam);}if(wParam&MK_RBUTTON){b[2].x=LOWORD(lParam);b[2].y=HIWORD(lParam);}SelectObject(hdc,GetStockObject (BLACK_PEN));DrawBezier(hdc,b);ReleaseDC(hWnd,hdc);}return 0;case WM_PAINT:InvalidateRect(hWnd,NULL,TRUE);hdc = BeginPaint(hWnd, &ps);DrawBezier( hdc, b);// TODO: Add any drawing code here...EndPaint(hWnd, &ps);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hWnd, message, wParam, lParam);}return 0;}// Message handler for about box.INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){UNREFERENCED_PARAMETER(lParam);switch (message){case WM_INITDIALOG:return (INT_PTR)TRUE;case WM_COMMAND:if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL){EndDialog(hDlg, LOWORD(wParam));return (INT_PTR)TRUE;}break;}return (INT_PTR)FALSE;}
