Nadesłany przez Krzysztof Zajączkowski, 02 lutego 2009 01:00
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prosta_prosta_c/Przeciecie/przeciecie.cpp:
// Autor: Krzysztof Zajączkowski // www.algorytm.org #include <windows.h> #include <math.h> class dPoint2D{ double x; double y; public: dPoint2D(double x,double y); dPoint2D operator -(dPoint2D p); dPoint2D operator +(dPoint2D p); dPoint2D operator *(double k); double operator *(dPoint2D p); double SickDistance2D(dPoint2D p); double Length(); dPoint2D GetPointOnLine(dPoint2D &fP,dPoint2D &lP); double X(); double Y(); void X(double x); void Y(double y); }; dPoint2D::dPoint2D(double x,double y){ this->x = x; this->y = y; } double dPoint2D::X(){ return x; } double dPoint2D::Y(){ return y; } void dPoint2D::Y(double y){ this->y = y; } void dPoint2D::X(double x){ this->x = x; } dPoint2D dPoint2D::operator *(double k){ dPoint2D temp(x * k,y * k); return temp; } double dPoint2D::operator *(dPoint2D p){ return p.X() * x + p.Y() * y; } double dPoint2D::SickDistance2D(dPoint2D p){ return pow(x - p.X(),2.0) + pow(y - p.Y(),2.0); } double dPoint2D::Length(){ return sqrt(x * x + y * y); } dPoint2D dPoint2D::operator -(dPoint2D p){ dPoint2D temp(this->x - p.X(),this->y - p.Y()); return temp; } dPoint2D dPoint2D::operator +(dPoint2D p){ dPoint2D temp(this->x + p.X(),this->y + p.Y()); return temp; } dPoint2D dPoint2D::GetPointOnLine(dPoint2D &fP,dPoint2D &lP){ //double u = ((x - fP.X()) * (lP.X() - fP.X()) + (y - fP.Y()) * (lP.Y() - fP.Y())) / (lP.SickDistance2D(fP)); double u = (((*this) - fP) * (lP - fP))/ ((fP - lP) * (fP - lP)); return fP + (lP - fP) * u; } LRESULT CALLBACK WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam){ static dPoint2D v1(20,300); // Punkty linii L1 static dPoint2D v2(300,20); static dPoint2D v3(500,500); // Punkty linii L2 static dPoint2D v4(100,100); static dPoint2D v5(0,0); // Punkt przecięcia static POINT MousePos; static dPoint2D *pt = NULL; switch(msg) { case WM_CREATE: { dPoint2D v6(0,0); v6 = v1 + v4 - v3; dPoint2D v7(0,0); dPoint2D v8(0,0); v7 = v6.GetPointOnLine(v1,v2); v8 = v4.GetPointOnLine(v1,v2); double v4v5_length = (v6 - v1).Length() / (v6 - v7).Length() * (v8 - v4).Length(); dPoint2D v9(0,0); v9 = v8.GetPointOnLine(v3,v4); v5 = (v9 - v4) * (v4v5_length / (v4 - v9).Length()); double l = v5.Length(); v5 = v5 + v4; } break; case WM_PAINT: { PAINTSTRUCT ps; HDC hdc = BeginPaint(hWnd,&ps); HPEN hPen = CreatePen(PS_SOLID,2,RGB(0,0,255)); SelectObject(hdc,hPen); MoveToEx(hdc,(int)v1.X(),(int)v1.Y(),NULL); LineTo(hdc,(int)v2.X(),(int)v2.Y()); MoveToEx(hdc,(int)v3.X(),(int)v3.Y(),NULL); LineTo(hdc,(int)v4.X(),(int)v4.Y()); Ellipse(hdc,(int)(v5.X() - 5),(int)(v5.Y() - 5),(int)(v5.X() + 5),(int)(v5.Y() + 5)); DeleteObject(hPen); EndPaint(hWnd,&ps); } break; case WM_LBUTTONDOWN: { if( 5 > abs(MousePos.x - v1.X()) && 5 > abs(MousePos.y - v1.Y())){ pt = &v1; }else if( 5 > abs(MousePos.x - v2.X()) && 5 > abs(MousePos.y - v2.Y())){ pt = &v2; }else if( 5 > abs(MousePos.x - v3.X()) && 5 > abs(MousePos.y - v3.Y())){ pt = &v3; }else if( 5 > abs(MousePos.x - v4.X()) && 5 > abs(MousePos.y - v4.Y())){ pt = &v4; } } break; case WM_LBUTTONUP: { pt = NULL; } break; case WM_RBUTTONDOWN: { } break; case WM_MOUSEMOVE: { MousePos.x = LOWORD(lParam); MousePos.y = HIWORD(lParam); if(pt){ //POINT pt; pt->X(MousePos.x); pt->Y(MousePos.y); dPoint2D v6(0,0); v6 = v1 + v4 - v3; dPoint2D v7(0,0); dPoint2D v8(0,0); v7 = v6.GetPointOnLine(v1,v2); v8 = v4.GetPointOnLine(v1,v2); double v4v5_length = (v6 - v1).Length() / (v6 - v7).Length() * (v8 - v4).Length(); dPoint2D v9(0,0); v9 = v8.GetPointOnLine(v3,v4); v5 = (v9 - v4) * (v4v5_length / (v4 - v9).Length()); double l = v5.Length(); v5 = v5 + v4; InvalidateRect(hWnd,NULL,true); } } break; case WM_DESTROY: { PostQuitMessage(0); } break; } return DefWindowProc(hWnd,msg,wParam,lParam); } int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE ,LPSTR ,int ){ WNDCLASS wnd; wnd.cbClsExtra = NULL; wnd.cbWndExtra = NULL; wnd.hbrBackground = CreateSolidBrush(RGB(0,0,0)); wnd.hCursor = LoadCursor(NULL,IDC_ARROW); wnd.hIcon = LoadIcon(NULL, IDI_APPLICATION); wnd.hInstance = hInstance; wnd.lpfnWndProc = WndProc; wnd.lpszClassName = "PunktPrzecieciaProstych"; wnd.lpszMenuName = NULL; wnd.style = CS_VREDRAW|CS_HREDRAW; if(!RegisterClass(&wnd)){ MessageBox(NULL,"Coś nie tak","Informacja",MB_OK); return 0; } HWND hwnd = CreateWindow("PunktPrzecieciaProstych","Autor: Krzysztof Zajączkowski, kontakt: malyszkz@wp.pl",WS_OVERLAPPEDWINDOW,0,0,800,600,NULL,NULL,hInstance,NULL); ShowWindow(hwnd, SW_SHOWNORMAL); UpdateWindow(hwnd); MSG msg; while(GetMessage(&msg,NULL,0,0)){ DispatchMessage(&msg); TranslateMessage(&msg); } return 0; }