ipolylin.cpp

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/*
 * IPOLYLIN.CPP
 * Polyline Component Chapter 8
 *
 * Implementation of the IPolyline8 interface that we expose on the
 * CPolyline object.
 *
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
 *
 * Kraig Brockschmidt, Microsoft
 * Internet  :  [e-mail]
 * Compuserve:  >INTERNET:[e-mail]
 */


#include "polyline.h"


/*
 * CImpIPolyline:CImpIPolyline
 * CImpIPolyline::~CImpIPolyline
 *
 * Constructor Parameters:
 *  pObj            PCPolyline pointing to the object we live in.
 *  pUnkOuter       LPUNKNOWN of the controlling unknown.
 */

CImpIPolyline::CImpIPolyline(PCPolyline pObj, LPUNKNOWN pUnkOuter)
    {
    m_cRef=0;
    m_pObj=pObj;
    m_pUnkOuter=pUnkOuter;
    return;
    }


CImpIPolyline::~CImpIPolyline(void)
    {
    return;
    }




/*
 * CImpIPolyline::QueryInterface
 * CImpIPolyline::AddRef
 * CImpIPolyline::Release
 */

STDMETHODIMP CImpIPolyline::QueryInterface(REFIID riid, PPVOID ppv)
    {
    return m_pUnkOuter->QueryInterface(riid, ppv);
    }

STDMETHODIMP_(ULONG) CImpIPolyline::AddRef(void)
    {
    ++m_cRef;
    return m_pUnkOuter->AddRef();
    }

STDMETHODIMP_(ULONG) CImpIPolyline::Release(void)
    {
    --m_cRef;
    return m_pUnkOuter->Release();
    }





/*
 * CImpIPolyline::Init
 *
 * 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
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise E_OUTOFMEMORY
 */

STDMETHODIMP CImpIPolyline::Init(HWND hWndParent, LPRECT pRect
    , DWORD dwStyle, UINT uID)
    {
    SCODE           sc;

    m_pObj->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_pObj->m_hInst, m_pObj);

    sc=(NULL!=m_pObj->m_hWnd) ? S_OK : E_OUTOFMEMORY;
    return ResultFromScode(sc);
    }



//CHAPTER8MOD
/*
 * ReadFromFile and WriteToFile are replaced by the IPersistStorage
 * implementation.  We no longer read from files, instead we use
 * storages.
 */
//End CHAPTER8MOD




/*
 * CImpIPolyline::DataSet
 *
 * Purpose:
 *  Sets the current data in this Polyline to a given structure.
 *
 * Parameters:
 *  pplIn           PPOLYLINEDATA 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:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::DataSet(PPOLYLINEDATA pplIn
    , BOOL fSizeToData, BOOL fNotify)
    {
    PPOLYLINEDATA   ppl=&m_pObj->m_pl;
    RECT            rc;

    /*
     * Copy the structure in pplIn and repaint to reflect the
     * new point set.  Note that unlike the RectSet message, we
     * do no scaling, assuming that the rect in the structure
     * is appropriate for the data.
     */

    if (NULL==pplIn)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    *ppl=*pplIn;

    //Inform our parent of the data change
    if (NULL!=m_pObj->m_pAdv)
        {
        m_pObj->m_fDirty=TRUE;
        m_pObj->m_pAdv->OnDataChange();
        }

    /*
     * If we're scaling the window to fit the data, then use
     * RectSet passing our current rectangle as the new one.
     * That makes sure that the data won't change but that the
     * window is resized.
     */

    if (fSizeToData)
        {
        POINT       pt;

        /*
         * Get our offset in the parent window so we can RectSet
         * to the right place since RectSet expects rectangle in
         * parent coordinates and we get it in client coordinates.
         */
        GetWindowRect(m_pObj->m_hWnd, &rc);
        pt.x=rc.left;
        pt.y=rc.top;
        ScreenToClient(GetParent(m_pObj->m_hWnd), &pt);
        RECTSTORECT(ppl->rc, rc);
        OffsetRect(&rc, pt.x, pt.y);

        //This will also cause a repaint.
        RectSet(&rc, fNotify);
        }
    else
        {
        //Make sure we're updated.
        InvalidateRect(m_pObj->m_hWnd, NULL, TRUE);
        UpdateWindow(m_pObj->m_hWnd);
        }

    return NOERROR;
    }







/*
 * CImpIPolyline::DataGet
 *
 * Purpose:
 *  Retrieves the Polyline's current data.
 *
 * Parameters:
 *  pplIn           PPOLYLINEDATA into which we copy the data.
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::DataGet(PPOLYLINEDATA pplIn)
    {
    if (NULL==pplIn)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    *pplIn=m_pObj->m_pl;
    return NOERROR;
    }







/*
 * CImpIPolyline::DataSetMem
 *
 * Purpose:
 *  Sets the Polyline's data using a global memory handle
 *  instead of a pointer.
 *
 * Parameters:
 *  hMem            HGLOBAL containing the data.
 *  fFree           BOOL indicating if we're to free the data.
 *                  The memory will be freed regardless of any
 *                  error returned from here.
 *  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:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::DataSetMem(HGLOBAL hMem, BOOL fFree
    , BOOL fSizeToData, BOOL fNotify)
    {
    PPOLYLINEDATA   ppl;
    HRESULT         hr=ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    if (NULL!=hMem)
        {
        ppl=(PPOLYLINEDATA)GlobalLock(hMem);
        hr=DataSet(ppl, fSizeToData, fNotify);

        GlobalUnlock(hMem);

        if (fFree)
            GlobalFree(hMem);
        }

    return hr;
    }







/*
 * CImpIPolyline::DataGetMem
 *
 * Purpose:
 *  Retrieves the Polyline's data in a global memory handle.
 *
 * Parameters:
 *  phMem           HGLOBAL * in which to store the handle.
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::DataGetMem(HGLOBAL *phMem)
    {
    HGLOBAL         hMem;
    PPOLYLINEDATA   ppl;
    HRESULT         hr=ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    if (NULL==phMem)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    hMem=GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE, CBPOLYLINEDATA);

    if (NULL!=hMem)
        {
        ppl=(PPOLYLINEDATA)GlobalLock(hMem);
        hr=DataGet(ppl);

        GlobalUnlock(hMem);

        if (FAILED(hr))
            {
            GlobalFree(hMem);
            hMem=NULL;
            }
        }

    *phMem=hMem;
    return hr;
    }




/*
 * CImpIPolyline::RenderBitmap
 *
 * Purpose:
 *  Creates a bitmap image of the current Polyline.
 *
 * Parameters:
 *  phBmp           HBITMAP * in which to return the bitmap.
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::RenderBitmap(HBITMAP *phBmp)
    {
    HDC             hDC;
    HDC             hMemDC;
    HBITMAP         hBmp;
    RECT            rc;
    HGDIOBJ         hObj;

    if (NULL==phBmp)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    //Render a bitmap the size of the current rectangle.
    hDC=GetDC(m_pObj->m_hWnd);
    hMemDC=CreateCompatibleDC(hDC);

    GetClientRect(m_pObj->m_hWnd, &rc);
    hBmp=CreateCompatibleBitmap(hDC, rc.right, rc.bottom);

    if (NULL!=hBmp)
        {
        //Draw the POLYLINEDATA into the bitmap.
        hObj=SelectObject(hMemDC, hBmp);
        m_pObj->Draw(hMemDC, FALSE, TRUE);
        SelectObject(hMemDC, hObj);
        }

    DeleteDC(hMemDC);
    ReleaseDC(m_pObj->m_hWnd, hDC);

    *phBmp=hBmp;
    return NOERROR;
    }







/*
 * CImpIPolyline::RenderMetafile
 *
 * Purpose:
 *  Renders the current image of the Polyline into a metafile.
 *
 * Parameters:
 *  phMF            HMETAFILE * in which to return the
 *                  new metafile.
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::RenderMetafile(HMETAFILE *phMF)
    {
    HDC             hDC;
    HMETAFILE       hMF;
    RECT            rc;

    if (NULL==phMF)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    //Create a memory metafile and return its handle.
    hDC=(HDC)CreateMetaFile(NULL);
    hMF=NULL;

    if (NULL!=hDC)
        {
        /*
         * This is absolutely essential to the metafile so it
         * can be scaled in the clipboard and any destination
         * application.
         */
        SetMapMode(hDC, MM_ANISOTROPIC);
        GetClientRect(m_pObj->m_hWnd, &rc);
        SetWindowOrgEx(hDC, 0, 0, NULL);
        SetWindowExtEx(hDC, rc.right, rc.bottom, NULL);

        m_pObj->Draw(hDC, TRUE, TRUE);
        hMF=CloseMetaFile(hDC);
        }

    *phMF=hMF;
    return NOERROR;
    }






/*
 * CImpIPolyline::RenderMetafilePict
 *
 * Purpose:
 *  Renders the current Polyline into a METAFILEPICT structure in
 *  global memory.
 *
 * Parameters:
 *  phMem           HGLOBAL * in which to return the
 *                  METAFILEPICT.
 *
 * Return Value:
 *  HRESULT         NOERROR if successful, otherwise a
 *                  POLYLINE_E_ value.
 */

STDMETHODIMP CImpIPolyline::RenderMetafilePict(HGLOBAL *phMem)
    {
    HGLOBAL         hMem;
    HMETAFILE       hMF;
    LPMETAFILEPICT  pMF;
    RECT            rc;
    HRESULT         hr;

    if (NULL==phMem)
        return ResultFromScode(POLYLINE_E_INVALIDPOINTER);

    //Get the metafile
    hr=RenderMetafile(&hMF);

    if (FAILED(hr))
        return hr;

    //Allocate the METAFILEPICT structure.
    hMem=GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE
        , sizeof(METAFILEPICT));

    if (NULL==hMem)
        {
        DeleteMetaFile(hMF);
        return ResultFromScode(E_FAIL);
        }