#include <windows.h> #include <math.h> LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam); #define R 200 #define PI 3.1415926 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) { //声明全局数据：类名 static TCHAR szClassName[] = TEXT("MyWindows"); HWND hwnd; MSG msg; //注册窗口类 WNDCLASS wndclass; wndclass.hInstance = hInstance; wndclass.lpszClassName = szClassName; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.lpfnWndProc = WndProc; wndclass.lpszMenuName = NULL; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.style = CS_HREDRAW; if (!RegisterClass(&wndclass)) { MessageBox(NULL, TEXT("this program must run in Windows NT!"), szClassName, MB_ICONERROR); return 0; } hwnd = CreateWindow( szClassName, TEXT("MyFirstPractice"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL ); ShowWindow(hwnd, nShowCmd); UpdateWindow(hwnd); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; RECT rect; static HBRUSH hBrush, hOldBrush; // 绘制一个多边形，可填充是需要极点的个数polygon POINT apt1[4] = { 100, 200, 200, 100, 300, 200,200, 300 }; // 绘制一个关闭多边形polyline需要极点数+1 注意：用线绘制的关闭图像不具有填充能力 // POINT apt2[5] = { 400, 200, 500, 100, 600, 200, 500, 300, 400, 200 }; POINT apt2[5]; int cxClient, cyClient; //星星的中心位置 switch (message) { case WM_PAINT: hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rect); cxClient = rect.right / 2; cyClient = rect.bottom / 2; //获取五个极点 //左上极点 apt2[0].x = cxClient - (int)(R*cos(PI / 5)); apt2[0].y = cyClient - (int)(R*sin(PI / 5)); //右上极点 apt2[1].x = cxClient + (int)(R*cos(PI / 5)); apt2[1].y = cyClient - (int)(R*sin(PI / 5)); //左下极点 apt2[2].x = cxClient - (int)(R*cos(PI / 5)); apt2[2].y = cyClient + (int)(R*sin(PI / 5)); //上极点 apt2[3].x = cxClient; apt2[3].y = cyClient - R; //右下极点 apt2[4].x = cxClient + (int)(R*cos(PI / 5)); apt2[4].y = cyClient + (int)(R*sin(PI / 5)); hBrush = CreateSolidBrush(RGB(255,255,0)); hOldBrush = SelectObject(hdc, hBrush); // SetPolyFillMode(hdc, ALTERNATE); //交替填充 SetPolyFillMode(hdc, WINDING); //螺旋填充，填充所有能够一笔完成的图形 // Polygon(hdc, apt2, 5); // Polyline(hdc, apt2, 5); // SelectObject(hdc, hOldBrush); DeleteObject(hOldBrush); EndPaint(hwnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }