polyline.cpp

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 *
 * Parameters:
 *  pRect           LPRECT in which to return the size.  The right
 *                  and bottom fields will contain the dimensions.
 *
 * Return Value:
 *  None
 */

void CPolyline::SizeGet(LPRECT pRect)
    {
    RectGet(pRect);
    return;
    }






/*
 * CPolyline::RectSet
 *
 * Purpose:
 *  Sets a new rectangle for the Polyline which sizes to fit.
 *
 * Parameters:
 *  pRect           LPRECT containing the new rectangle.
 *  fNotify         BOOL indicating if we're to notify anyone of
 *                  the change.
 *
 * Return Value:
 *  None
 */

void CPolyline::RectSet(LPRECT pRect, BOOL fNotify)
    {
    UINT        cx, cy;
    RECT        rc;

    //Scale the points from our current size to the new size
    cx=pRect->right-pRect->left;
    cy=pRect->bottom-pRect->top;

    SetWindowPos(m_hWnd, NULL, pRect->left, pRect->top
        , cx, cy, SWP_NOZORDER);

    SetRect(&rc, 0, 0, cx, cy);
    RECTTORECTS(rc, m_pl.rc);

    if (fNotify && NULL!=m_pAdv)
        m_pAdv->OnSizeChange();

    InvalidateRect(m_hWnd, NULL, TRUE);

    return;
    }







/*
 * CPolyline::SizeSet
 *
 * Purpose:
 *  Sets a new size for the Polyline which sizes to fit.
 *
 * Parameters:
 *  pRect           LPRECT containing the new rectangle.
 *  fNotify         BOOL indicating if we're to notify anyone of
 *                  the change.
 *
 * Return Value:
 *  None
 */

void CPolyline::SizeSet(LPRECT pRect, BOOL fNotify)
    {
    UINT        cx, cy;

    //Scale the points from our current size to the new size
    cx=pRect->right-pRect->left;
    cy=pRect->bottom-pRect->top;

    SetWindowPos(m_hWnd, NULL, 0, 0, (UINT)cx, (UINT)cy
        , SWP_NOMOVE | SWP_NOZORDER);

    if (fNotify && NULL!=m_pAdv)
        m_pAdv->OnSizeChange();

    InvalidateRect(m_hWnd, NULL, TRUE);

    return;
    }






/*
 * CPolyline::ColorSet
 *
 * Purpose:
 *  Changes for background or line color in the Polyline
 *
 * Parameters:
 *  iColor          UINT index of the color to change.
 *  cr              COLORREF new color to use.
 *
 * Return Value:
 *  COLORREF        Previous color for the index iColor.
 */

COLORREF CPolyline::ColorSet(UINT iColor, COLORREF cr)
    {
    COLORREF    crRet;

    switch (iColor)
        {
        case POLYLINECOLOR_BACKGROUND:
            crRet=m_pl.rgbBackground;
            m_pl.rgbBackground=cr;
            break;

        case POLYLINECOLOR_LINE:
            crRet=m_pl.rgbLine;
            m_pl.rgbLine=cr;
            break;
        }

    //If the color changed, repaint
    if (crRet!=cr)
        {
        if (NULL!=m_pAdv)
            m_pAdv->OnColorChange();

        InvalidateRect(m_hWnd, NULL, TRUE);
        UpdateWindow(m_hWnd);
        }

    return crRet;
    }







/*
 * CPolyline::ColorGet
 *
 * Purpose:
 *  Retrieves one of the colors currently in use by the Polyline.
 *
 * Parameters:
 *  iColor          UINT identifying the color of interest.
 *
 * Return Value:
 *  COLORREF        Current color for iColor.
 */

COLORREF CPolyline::ColorGet(UINT iColor)
    {
    COLORREF    crRet;

    crRet=(POLYLINECOLOR_BACKGROUND==iColor)
        ? m_pl.rgbBackground : m_pl.rgbLine;

    return crRet;
    }








/*
 * CPolyline::LineStyleSet
 *
 * Purpose:
 *  Changes the line style in use by the Polyline
 *
 * Parameters:
 *  iStyle          UINT style of the line to use.
 *
 * Return Value:
 *  UINT            Previous style.
 */

UINT CPolyline::LineStyleSet(UINT iStyle)
    {
    UINT        uRet=(UINT)m_pl.iLineStyle;

    //Validate the line style
    if (PS_SOLID==iStyle || PS_DASH==iStyle || PS_DOT==iStyle
        || PS_DASHDOT==iStyle || PS_DASHDOTDOT==iStyle)
        {
        m_pl.iLineStyle=iStyle;

        if (uRet!=(UINT)m_pl.iLineStyle)
            {
            if (NULL!=m_pAdv)
                m_pAdv->OnLineStyleChange();

            InvalidateRect(m_hWnd, NULL, TRUE);
            UpdateWindow(m_hWnd);
            }
        }

    return uRet;
    }







/*
 * CPolyline::LineStyleGet
 *
 * Purpose:
 *  Retrieves the current line style in use in the Polyline
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  UINT            Current line style.
 */

UINT CPolyline::LineStyleGet(void)
    {
    return m_pl.iLineStyle;
    }






/*
 * CPolyline::RenderBitmap
 *
 * Purpose:
 *  Creates a bitmap image of the current Polyline.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  HBITMAP         Handle to the newly rendered bitmap.
 */

HBITMAP CPolyline::RenderBitmap(void)
    {
    HDC         hDC;
    HDC         hMemDC;
    HBITMAP     hBmp;
    RECT        rc;
    HGDIOBJ     hObj;

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

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

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

    DeleteDC(hMemDC);
    ReleaseDC(m_hWnd, hDC);

    return hBmp;
    }







/*
 * CPolyline::RenderMetafile
 *
 * Purpose:
 *  Renders the current image of the Polyline into a metafile.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  HMETAFILE       Handle to the newly created metafile.
 */

HMETAFILE CPolyline::RenderMetafile(void)
    {
    HDC         hDC;
    HMETAFILE   hMF;
    RECT        rc;

    //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_hWnd, &rc);
        SetWindowOrgEx(hDC, 0, 0, NULL);
        SetWindowExtEx(hDC, rc.right, rc.bottom, NULL);

        Draw(hDC, TRUE, TRUE);
        hMF=CloseMetaFile(hDC);
        }

    return hMF;
    }






/*
 * CPolyline::RenderMetafilePict
 *
 * Purpose:
 *  Renders the current Polyline into a METAFILEPICT structure in
 *  global memory.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  HGLOBAL         Memory containing the METAFILEPICT structure.
 */

HGLOBAL CPolyline::RenderMetafilePict(void)
    {
    HGLOBAL         hMem;
    HMETAFILE       hMF;
    LPMETAFILEPICT  pMF;
    RECT            rc;


    //Get the metafile
    hMF=RenderMetafile();

    if (NULL==hMF)
        return NULL;

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

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

    /*
     * Global lock only fails in PMODE if the selector is invalid
     * (like it was discarded) or references a 0 length segment,
     * neither of which can happen here.
     */
    pMF=(LPMETAFILEPICT)GlobalLock(hMem);

    pMF->hMF=hMF;
    pMF->mm=MM_ANISOTROPIC;

    //Insert the extents in MM_HIMETRIC units.
    GetClientRect(m_hWnd, &rc);
    RectConvertMappings(&rc, FALSE);
    pMF->xExt=rc.right;
    pMF->yExt=rc.bottom;

    GlobalUnlock(hMem);
    return hMem;
    }






/*
 * CPolyline::RectConvertMappings
 *
 * Purpose:
 *  Converts the contents of a rectangle from device (MM_TEXT) or
 *  HIMETRIC to the other.
 *
 * Parameters:
 *  pRect           LPRECT containing the rectangle to convert.
 *  fToDevice       BOOL TRUE to convert from HIMETRIC to device,
 *                  FALSE to convert device to HIMETRIC.
 *
 * Return Value:
 *  None
 */

void CPolyline::RectConvertMappings(LPRECT pRect, BOOL fToDevice)
    {
    HDC      hDC;
    int      iLpx, iLpy;

    if (NULL==pRect)
        return;

    hDC=GetDC(NULL);
    iLpx=GetDeviceCaps(hDC, LOGPIXELSX);
    iLpy=GetDeviceCaps(hDC, LOGPIXELSY);
    ReleaseDC(NULL, hDC);

    if (fToDevice)
        {
        pRect->left=MulDiv(iLpx, pRect->left, HIMETRIC_PER_INCH);
        pRect->top =MulDiv(iLpy, pRect->top , HIMETRIC_PER_INCH);

        pRect->right=MulDiv(iLpx, pRect->right,  HIMETRIC_PER_INCH);
        pRect->bottom=MulDiv(iLpy, pRect->bottom,HIMETRIC_PER_INCH);

       #ifdef NEVER
        /*
         * In this conversion we may get situations where the top
         * coordinate is larger than the bottom, which messes us up.
         */
        if (pRect->bottom < pRect->top)
            {
            iLpy=pRect->top;
            pRect->top=pRect->bottom;
            pRect->bottom=iLpy;
            }
       #endif
        }
    else
        {
        pRect->left=MulDiv(pRect->left, HIMETRIC_PER_INCH, iLpx);
        pRect->top =MulDiv(pRect->top , HIMETRIC_PER_INCH, iLpy);

        pRect->right =MulDiv(pRect->right, HIMETRIC_PER_INCH, iLpx);
        pRect->bottom=MulDiv(pRect->bottom,HIMETRIC_PER_INCH, iLpy);
        }

    return;
    }