B样条曲线插值程序，实现B样条曲线的经典算法.zip

/******************************************************************************************************/ // // // VERSION : 1.0 // NAME : BSpline.cpp (Non Uniform Non Rational B-Splines) // DESC : a class for B-Splines // AUTOR : Stefan Beck | tolschock@gmx.de // DATE : 28.04.2004 // UPDATE : 28.04.2004 | 29.04.2004 // BUGS : none // /******************************************************************************************************/ #include <windows.h> #include "BSpline.h" // class for BSplines /******************************************************************************************************/ HWND hWnd = 0; // handle on the main application HDC hDC; // graphics context HWND CreateMainWindow(HINSTANCE hInstance); // create window and set its properties LRESULT CALLBACK MessageHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam); // process messages BSpline b1(3, 40); // a BSpline Object // organisationally variables //---------------------------------------------------------------------------------------- bool picked = 0; // is a controll point picked ? int picked_cp = 0; // which kp is picked ? int loc_x = 500; // local x coordinates int loc_y = 400; // local y coordinates #include "functions.h" // include necesary functions /******************************************************************************************************/ /******************************************************************************************************/ LRESULT CALLBACK MessageHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_DESTROY: { PostQuitMessage(0); return 0; }break; /****************************************************************************/ case WM_LBUTTONDOWN: // add cp { if(b1.GetControllPoint(lParam, hDC) >= 0) // mouse is over point { picked_cp = b1.GetControllPoint(lParam, hDC); // whichh kp is picked ? picked = 1; // kp is picked } else // add a new controll point { if(b1.GetCPNr() < b1.GetMaxCP()) { b1.SetCPValue(b1.GetCPNr(), LOWORD(lParam)-loc_x, HIWORD(lParam)-loc_y, 0); b1.SetCPNr(b1.GetCPNr()+1); b1.createNodeVector(); } InvalidateRect(hWnd, 0, TRUE); } return 0; }break; /****************************************************************************/ case WM_LBUTTONUP: { if( picked==1 ){ picked_cp = 0; picked = 0; } return 0; }break; /****************************************************************************/ case WM_RBUTTONDOWN: // remove cp { if(b1.GetControllPoint(lParam, hDC) == b1.GetCPNr()-1) // delete the last kp { if(b1.GetCPNr() > b1.GetDegree()+1) { b1.SetCPNr(b1.GetCPNr()-1); b1.createNodeVector(); } } InvalidateRect(hWnd, 0, TRUE); return 0; }break; /****************************************************************************/ case WM_MOUSEMOVE: // move cp { if( picked==1 ) // if picked { b1.SetCPValue(picked_cp, LOWORD(lParam)-loc_x, HIWORD(lParam)-loc_y, 20); InvalidateRect(hWnd, 0, TRUE); } return 0; }break; /****************************************************************************/ case WM_PAINT: { PAINTSTRUCT ps; // paintstructure hDC = BeginPaint(hWnd, &ps); // here the paintings starts //------------------------------------------------------------------------------------------------- b1.ShowTextInfo(hDC); // infos about the nV, and thhe control points b1.ShowControlElements(lParam, hDC); // show control points and control lines //b1.BSplinePoints(hDC); b1.BSplineLines(hDC); //------------------------------------------------------------------------------------------------- EndPaint(hWnd, &ps); // and here ends the paintings return 0; }break; } return DefWindowProc(hWnd, msg, wParam, lParam); } /******************************************************************************************************/