旋转下落

#define _USE_MATH_DEFINES#include <math.h>#include <windows.h>#pragma comment(linker, "/subsystem:windows")double sin_deg(double deg){return sin(deg*M_PI/180.0);}double cos_deg(double deg){return cos(deg*M_PI/180.0);}void RotateAndDown(double deg, HWND hWnd){XFORM xForm1={0};XFORM xForm2={0};XFORM xForm3={0};HDC hDC = GetDC(hWnd);SetGraphicsMode(hDC, GM_ADVANCED);SetMapMode(hDC, MM_LOENGLISH);int deg_rot = (int)deg;//旋转矩阵xForm1.eM11 = (FLOAT) cos_deg(deg_rot);xForm1.eM12 = (FLOAT) sin_deg(deg_rot);xForm1.eM21 = (FLOAT) (0-sin_deg(deg_rot));xForm1.eM22 = (FLOAT) cos_deg(deg_rot);xForm1.eDx = (FLOAT) 0.0;xForm1.eDy = (FLOAT) 0.0;//平移矩阵xForm2.eM11 = (FLOAT) 1;xForm2.eM12 = (FLOAT) 0;xForm2.eM21 = (FLOAT) 0;xForm2.eM22 = (FLOAT) 1;xForm2.eDx = (FLOAT) 0.0;xForm2.eDy = (FLOAT) (0-deg);//数学理论：矩阵的线性变换是支持乘法原理的。//关键：将旋转矩阵与平移矩阵相乘，从而得到一个新的矩阵，它能同时执行旋转和平移变换。CombineTransform(&xForm3, &xForm1, &xForm2);SetWorldTransform(hDC, &xForm3);RECT rect={0};GetClientRect(hWnd, (LPRECT) &rect);DPtoLP(hDC, (LPPOINT) &rect, 2);SelectObject(hDC, CreatePen(PS_SOLID, 10, RGB(0,255,0)));Rectangle(hDC, rect.right/2-100, rect.bottom/2-100, rect.right/2+100, rect.bottom/2+100);SelectObject(hDC, CreatePen(PS_SOLID, 5, RGB(255,0,0)));Rectangle(hDC, rect.right/2-1, rect.bottom/2-1, rect.right/2, rect.bottom/2);ReleaseDC(hWnd, hDC);}DWORD WINAPI DrawThread(LPVOID lpParameter){static int n=0;HWND hwnd = (HWND)lpParameter;InvalidateRect(hwnd, NULL, TRUE);for ( n=0; n<=360; n+=5 ){if ( n != 360 ) InvalidateRect(hwnd, NULL, TRUE);Sleep(10);RotateAndDown(n, hwnd);Sleep(10);}return 0;}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){switch (message){case WM_CREATE:CreateThread(NULL, 0, DrawThread, (LPVOID)hwnd, 0, NULL);break;case WM_LBUTTONUP:CreateThread(NULL, 0, DrawThread, (LPVOID)hwnd, 0, NULL);break;case WM_RBUTTONUP:InvalidateRect(hwnd, NULL, TRUE);break;case WM_CLOSE:break;case WM_DESTROY:PostQuitMessage(0);break;}return DefWindowProc(hwnd, message, wParam, lParam);}int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){WNDCLASS wndclass={0};wndclass.cbClsExtra = 0;wndclass.cbWndExtra = 0;wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);wndclass.hInstance = hInstance;wndclass.lpfnWndProc = WndProc;wndclass.lpszClassName = "L";wndclass.lpszMenuName = NULL;wndclass.style = CS_HREDRAW | CS_VREDRAW;if ( !RegisterClass(&wndclass) ){MessageBox(NULL, "窗口注册失败！", "信息", 0);return 0;}HWND hwnd = CreateWindow("L","旋转下落",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);if ( hwnd == NULL ){MessageBox(NULL, "窗口创建失败！", "信息", 0);return 0;}ShowWindow(hwnd, nShowCmd);UpdateWindow(hwnd);MSG msg={0};while ( GetMessage(&msg, NULL, 0, 0) ){TranslateMessage(&msg);DispatchMessage(&msg);}if ( !UnregisterClass(wndclass.lpszClassName, hInstance) ){MessageBox(NULL,"窗口注销失败！","信息",0);}return msg.wParam;}