实验代码-基于Windows的绘图

// Win32Project1.cpp : 定义应用程序的入口点。 // #include "stdafx.h" #include "Win32Project1.h" #include <math.h> #include <time.h> #define MAX_LOADSTRING 100 #define PI 3.1415926 // 全局变量: HINSTANCE hInst; // 当前实例 TCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本 TCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名 // 此代码模块中包含的函数的前向声明: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY _tWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPTSTR lpCmdLine, _In_ int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); // TODO: 在此放置代码。 MSG msg; HACCEL hAccelTable; // 初始化全局字符串 LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hInstance, IDC_WIN32PROJECT1, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // 执行应用程序初始化: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WIN32PROJECT1)); // 主消息循环: while (GetMessage(&msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; } // // 函数: MyRegisterClass() // // 目的: 注册窗口类。 // 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_WIN32PROJECT1)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = MAKEINTRESOURCE(IDC_WIN32PROJECT1); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&wcex); } // // 函数: InitInstance(HINSTANCE, int) // // 目的: 保存实例句柄并创建主窗口 // // 注释: // // 在此函数中，我们在全局变量中保存实例句柄并 // 创建和显示主程序窗口。 // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; hInst = hInstance; // 将实例句柄存储在全局变量中 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; } // // 函数: WndProc(HWND, UINT, WPARAM, LPARAM) // // 目的: 处理主窗口的消息。 // // WM_COMMAND - 处理应用程序菜单 // WM_PAINT - 绘制主窗口 // WM_DESTROY - 发送退出消息并返回 // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; HPEN hpen; POINT Poly[5]; //外五边形的五个点 POINT Poly_s[5]; //内五边形的五个点 POINT BigTri[3]; //大三角形 POINT SmallTri[3]; //小三角形 double r = 200.0; //外圆半径 double rs = r*sin(PI/180*18)/cos(PI/180*36); //内圆半径 for(int i=0;i<5;i++) { Poly[i].x = (long)(r*cos(i*72.0/180*PI))+330; Poly[i].y = (long)(r*sin(i*72.0/180*PI))+250; Poly_s[i].x = (long)(rs*cos(i*72.0/180*PI+36.0/180*PI))+330; Poly_s[i].y = (long)(rs*sin(i*72.0/180*PI+36.0/180*PI))+250; } srand((unsigned)time(NULL));//置随机种子 switch (message) { case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // 分析菜单选择: 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_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: 在此添加任意绘图代码... hpen=CreatePen(PS_SOLID,2,RGB(255,0,0)); SelectObject(hdc,hpen); Polygon(hdc,Poly,5); DeleteObject(hpen); MoveToEx(hdc,Poly[0].x,Poly[0].y,NULL); for(int i=0;i<5;i++) //用不同颜色的线条连接互不相邻的两个点 { SelectObject(hdc,CreatePen(PS_SOLID,2,RGB(rand()%256,rand()%256,rand()%256))); LineTo(hdc,Poly[(i+2)%5].x,Poly[(i+2)%5].y); } SelectObject(hdc,CreateSolidBrush(RGB(rand()%256,rand()%256,rand()%256)));//画内部五边形 Polygon(hdc,Poly_s,5); for(int i=0;i<5;i++) //用不同的颜色画内部大三角形 { BigTri[0]=Poly[i%5]; BigTri[1]=Poly[(i+1)%5]; BigTri[2]=Poly_s[i%5]; SelectObject(hdc,CreateSolidBrush(RGB(rand()%256,rand()%256,rand()%256))); Polygon(hdc,BigTri,3); } for(int i=0;i<5;i++) //用不同的颜色画内部小三角形 { SmallTri[0]=Poly_s[i%5]; SmallTri[1]=Poly_s[(i+1)%5]; SmallTri[2]=Poly[(i+1)%5]; SelectObject(hdc,CreateSolidBrush(RGB(rand()%256,rand()%256,rand()%256))); Polygon(hdc,SmallTri,3); } EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // “关于”框的消息处理程序。 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; }