bline.cpp

三次样条曲线的模拟过程

// BLine.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include "line.h"


#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];								// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];								// The title bar text

// Foward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_BLINE, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_BLINE);

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_BLINE);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= (LPCSTR)IDC_BLINE;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   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;
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR szHello[MAX_LOADSTRING];
	LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam); 
			// Parse the menu selections:
			switch (wmId)
			{
				case IDM_ABOUT:
				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);
				   break;
				default:
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			// TODO: Add any drawing code here...
			RECT rt;
			GetClientRect(hWnd, &rt);
		   
			{
			HPEN hPen    = ::CreatePen( PS_NULL, 1, RGB( 255, 255, 255 ) );
			HPEN hOldPen = (HPEN)::SelectObject( hdc, hPen );
			HBRUSH hBrush = ::CreateSolidBrush( RGB( 255, 0, 0 ) );
			HBRUSH hOldBrush = ( HBRUSH )::SelectObject( hdc, hBrush );
			int nCount	 = mousePoint.size();
			for ( int i = 0; i < nCount; i++ )
			{
				POINT pt = mousePoint[i];
				::Ellipse( hdc, pt.x - 3, pt.y -3, pt.x + 3, pt.y + 3);
			}

			::SelectObject( hdc, hOldPen );
			::SelectObject( hdc, hOldBrush );
			::DeleteObject( hPen );
			::DeleteObject( hBrush );

			nCount = linePoint.size();
			POINT pt;

			if ( nCount > 0 ) pt = linePoint[0];
			for ( i = 1; i < nCount; i++ )
			{
				::MoveToEx( hdc, pt.x, pt.y, NULL );
				::LineTo( hdc, linePoint[i].x, linePoint[i].y );
				pt = linePoint[i];
			}
			}
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		case WM_LBUTTONDOWN:
			{
				int xPos = LOWORD(lParam) ; 
				int yPos = HIWORD(lParam); 
				POINT pt;
				pt.x = xPos;
				pt.y = yPos;
				mousePoint.push_back( pt );

				B3Line( mousePoint, linePoint, controlPoint );

				RECT rect;
				::GetClientRect( hWnd, &rect );
				::InvalidateRect( hWnd, &rect, true );
			}
			break;
		case WM_RBUTTONUP:
			{
				bPressing = false;
				nIndex = -1;
			}
			break;
		case WM_RBUTTONDOWN:
			{
				int xPos = LOWORD(lParam) ; 
				int yPos = HIWORD(lParam); 
				POINT pt;
				pt.x = xPos;
				pt.y = yPos;

				int nResult = IsOnLine( controlPoint, mousePoint, pt, nIndex, true );		//	如果点击在曲线上那么就加入空虚控制点
				if ( nResult == 0 )
				{
				}
				else
				{
					if ( nResult == - 1 )
					{
						//	本次点击在曲线上
					}
					else if ( nResult == 1 )
					{
						bPressing = true;

						B3Line( mousePoint, linePoint, controlPoint);
						RECT rect;
						::GetClientRect( hWnd, &rect );
						::InvalidateRect( hWnd, &rect, true );

					}

				}
			}

			break;
		case WM_MOUSEMOVE:
			{
				if ( bPressing )
				{
					if ( nIndex >= 0 )
					{
						int xPos = LOWORD(lParam) ; 
						int yPos = HIWORD(lParam); 
						POINT pt;
						pt.x = xPos;
						pt.y = yPos;

						if ( EditMousePoint( mousePoint, nIndex, pt ) )
						{
							B3Line( mousePoint, linePoint, controlPoint);
							RECT rect;
							::GetClientRect( hWnd, &rect );
							::InvalidateRect( hWnd, &rect, true );
						}
					
					}
				}
			}
			break;

		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
			break;
	}
    return FALSE;
}