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SCHMOO
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POLYLINE.CPP
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C/C++ Source or Header
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1993-06-16
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25KB
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1,152 lines
/*
* POLYLINE.CPP
*
* Implementation of the CPolyline class.
*
* Copyright (c)1993 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Software Design Engineer
* Microsoft Systems Developer Relations
*
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "schmoo.h"
/*
* CPolyline:CPolyline
* CPolyline::~CPolyline
*
* Constructor Parameters:
* hInst HINSTANCE of the application we're in.
*/
CPolyline::CPolyline(HINSTANCE hInst)
: CWindow(hInst)
{
m_pAdv=NULL;
m_hWnd=NULL;
return;
}
CPolyline::~CPolyline(void)
{
//No need to destroy our window since we're a child
return;
}
/*
* CPolyline::FInit
*
* Purpose:
* Instantiates a polyline window within a given parent. The
* parent may be a main application window, could be an MDI child
* window. We really do not care.
*
* Parameters:
* hWndParent HWND of the parent of this window
* pRect LPRECT that this window should occupy
* dwStyle DWORD containing the window's style flags
* uID UINT ID to associate with this window
* pAdv LPCPolylineAdviseSink of the sink wanting our notifications.
*
* Return Value:
* BOOL TRUE if the function succeeded, FALSE otherwise.
*/
BOOL CPolyline::FInit(HWND hWndParent, LPRECT pRect, DWORD dwStyle, UINT uID
, LPCPolylineAdviseSink pAdv)
{
m_hWnd=CreateWindowEx(WS_EX_NOPARENTNOTIFY, SZCLASSPOLYLINE
, SZCLASSPOLYLINE, dwStyle, pRect->left, pRect->top
, pRect->right-pRect->left, pRect->bottom-pRect->top
, hWndParent, (HMENU)uID, m_hInst, (LPVOID)this);
if (NULL!=m_hWnd)
m_pAdv=pAdv;
return (NULL!=m_hWnd);
}
/*
* CPolyline::New
*
* Purpose:
* Cleans out and reinitializes the data to defaults.
*
* Parameters:
* None
*
* Return Value:
* None
*/
void CPolyline::New(void)
{
UINT i;
m_pl.wVerMaj=VERSIONMAJOR;
m_pl.wVerMin=VERSIONMINOR;
//Our rectangle is the size of our window's client area.
GetClientRect(m_hWnd, &m_pl.rc);
//Clean out the POLYLINE structure and repaint the window.
for (i=0; i< CPOLYLINEPOINTS; i++)
{
m_pl.rgpt[i].x=0;
m_pl.rgpt[i].y=0;
}
m_pl.cPoints =0;
m_pl.rgbBackground=GetSysColor(COLOR_WINDOW);
m_pl.rgbLine =GetSysColor(COLOR_WINDOWTEXT);
m_pl.iLineStyle =PS_SOLID;
InvalidateRect(m_hWnd, NULL, TRUE);
UpdateWindow(m_hWnd);
//Inform the advise sink of this data change.
if (NULL!=m_pAdv)
m_pAdv->OnDataChange();
return;
}
/*
* CPolyline::Undo
*
* Purpose:
* Reverses previous actions in a Polyline.
*
* Parameters:
* None
*
* Return Value:
* BOOL TRUE if we can Undo more, FALSE otherwise.
*/
BOOL CPolyline::Undo(void)
{
//Decrement the number of active points and repaint.
if (m_pl.cPoints > 0)
{
m_pl.cPoints--;
InvalidateRect(m_hWnd, NULL, TRUE);
UpdateWindow(m_hWnd);
}
if (NULL!=m_pAdv)
m_pAdv->OnPointChange();
//Return if we can undo any more.
return (0!=m_pl.cPoints);
}
/*
* CPolyline::ReadFromFile
*
* Purpose:
* Loads our data (any known version) from a file handle returning
* the version number of the data or an error value.
*
* Parameters:
* pszFile LPSTR of the file to open.
*
* Return Value:
* LONG Version number or negative POLYLINE_E_* value.
*/
LONG CPolyline::ReadFromFile(LPSTR pszFile)
{
OFSTRUCT of;
HFILE hFile;
POLYLINEDATA pl;
UINT cb=-1;
UINT cbExpect=0;
if (NULL==pszFile)
return POLYLINE_E_READFAILURE;
hFile=OpenFile(pszFile, &of, OF_READ);
if (HFILE_ERROR==hFile)
return POLYLINE_E_READFAILURE;
//Read version numbers and seek back to file beginning.
cb=_lread(hFile, (LPSTR)&pl, 2*sizeof(WORD));
if (2*sizeof(WORD)!=cb)
{
_lclose(hFile);
return POLYLINE_E_READFAILURE;
}
_llseek(hFile, 0L, 0);
/*
* For version 2.0, read the entire file. For version 1.0 read
* the file up to CBPOLYLINEDATAVER10. For anything else, give an
* error.
*/
switch (pl.wVerMaj)
{
case VERSIONMAJOR: //2.x
switch (pl.wVerMin)
{
case VERSIONMINOR: //2.0
cbExpect=CBPOLYLINEDATA;
break;
default:
break;
}
break;
case 1: //1.x
switch (pl.wVerMin)
{
case 0: //1.0
cbExpect=CBPOLYLINEDATA10;
break;
default:
break;
}
break;
default:
break;
}
if (0==cbExpect)
{
_lclose(hFile);
return POLYLINE_E_UNSUPPORTEDVERSION;
}
cb=_lread(hFile, (LPSTR)&pl, cbExpect);
_lclose(hFile);
if (cbExpect!=cb)
return POLYLINE_E_READFAILURE;
/*
* If we loaded successfully, make the data current. By using DataSet
* we centralize our version upgrading. We size the polyline window
* to the data AND notify the document so it sizes to the polyline.
*/
DataSet(&pl, TRUE, TRUE);
//Return what version we just loaded.
return MAKELONG(pl.wVerMin, pl.wVerMaj);
}
/*
* CPolyline::WriteToFile
*
* Purpose:
* Ignorantly writes our current data into an opened file in a particular
* version.
*
* Parameters:
* pszFile LPSTR filename in which to store the data.
* lVer LONG providing version number Major (HI) and Minor (Low)
*
* Return Value:
* LONG A POLYLINE_E_* value.
*/
LONG CPolyline::WriteToFile(LPSTR pszFile, LONG lVer)
{
UINT cb;
UINT cbExpect=0;
WORD wVerMaj=HIWORD(lVer);
WORD wVerMin=LOWORD(lVer);
POLYLINEDATA pl;
HFILE hFile;
OFSTRUCT of;
if (NULL==pszFile)
return POLYLINE_E_READFAILURE;
//Get a copy of our data in the version we're going to save.
DataGet(&pl, lVer);
switch (wVerMaj)
{
case VERSIONMAJOR: //2.x
switch (wVerMin)
{
case VERSIONMINOR: //2.0
cbExpect=CBPOLYLINEDATA;
break;
default:
break;
}
break;
case 1: //1.x
switch (wVerMin)
{
case 0: //1.0
cbExpect=CBPOLYLINEDATA10;
break;
default:
break;
}
break;
default:
break;
}
if (0==cbExpect)
return POLYLINE_E_UNSUPPORTEDVERSION;
hFile=OpenFile(pszFile, &of, OF_CREATE | OF_WRITE);
if (HFILE_ERROR==hFile)
return DOCERR_COULDNOTOPEN;
cb=_lwrite(hFile, (LPSTR)&pl, cbExpect);
_lclose(hFile);
return (cbExpect==cb) ? POLYLINE_E_NONE : POLYLINE_E_WRITEFAILURE;
}
/*
* CPolyline::DataSet
*
* Purpose:
* Sets the current data in this Polyline to a given structure.
*
* Parameters:
* ppl LPPOLYLINEDATA to initialize to.
* fSizeToData BOOL indicating if we're to size to the data or scale it.
* fNotify BOOL indicating if we're to send an advise on this change.
*
* Return Value:
* LONG A POLYLINE_E_* value.
*/
LONG CPolyline::DataSet(LPPOLYLINEDATA ppl, BOOL fSizeToData,