graphctl.c

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    SelectObject(m_dcGrid, oldFont);

    /*  y units */
    oldFont = (HFONT)SelectObject(m_dcGrid, yUnitFont);
    SetTextAlign(m_dcGrid, TA_CENTER|TA_BASELINE);
    TextOut(m_dcGrid, (m_rectClient.left+m_rectPlot.left)/2,
            (m_rectPlot.bottom+m_rectPlot.top)/2, m_strYUnitsString, _tcslen(m_strYUnitsString));
    SelectObject(m_dcGrid, oldFont);
#endif
    /*  at this point we are done filling the the grid bitmap,  */
    /*  no more drawing to this bitmap is needed until the setting are changed */

    /*  if we don't have one yet, set up a memory dc for the plot */
    if (this->m_dcPlot == NULL)
    {
        this->m_dcPlot = CreateCompatibleDC(dc);
        this->m_bitmapPlot = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
        this->m_bitmapOldPlot = (HBITMAP)SelectObject(this->m_dcPlot, this->m_bitmapPlot);
    }
    else if(bResize)
    {
        // the size of the drawing area has changed
        // so create a new bitmap of the appropriate size
        if(this->m_bitmapPlot != NULL)
        {
            this->m_bitmapPlot = (HBITMAP)SelectObject(this->m_dcPlot, this->m_bitmapOldPlot);
            DeleteObject(this->m_bitmapPlot);
            this->m_bitmapPlot = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
            SelectObject(this->m_dcPlot, this->m_bitmapPlot);
        }
    }

    /*  make sure the plot bitmap is cleared */
    SetBkColor(this->m_dcPlot, this->m_crBackColor);
    FillRect(this->m_dcPlot, &this->m_rectClient, this->m_brushBack);

    /*  finally, force the plot area to redraw */
    InvalidateRect(this->m_hParentWnd, &this->m_rectClient, TRUE);
    ReleaseDC(this->m_hParentWnd, dc);
}

double GraphCtrl_AppendPoint(TGraphCtrl* this,
                             double dNewPoint0, double dNewPoint1,
                             double dNewPoint2, double dNewPoint3)
{
    /*  append a data point to the plot & return the previous point */
    double dPrevious;

    dPrevious = this->m_dCurrentPosition[0];
    this->m_dCurrentPosition[0] = dNewPoint0;
    this->m_dCurrentPosition[1] = dNewPoint1;
    this->m_dCurrentPosition[2] = dNewPoint2;
    this->m_dCurrentPosition[3] = dNewPoint3;
    GraphCtrl_DrawPoint(this);
    /* Invalidate(); */
    return dPrevious;
}

void GraphCtrl_Paint(TGraphCtrl* this, HWND hWnd, HDC dc)
{
    HDC memDC;
    HBITMAP memBitmap;
    HBITMAP oldBitmap; /*  bitmap originally found in CMemDC */

/*   RECT rcClient; */
/*   GetClientRect(hWnd, &rcClient); */
/*   FillSolidRect(dc, &rcClient, RGB(255, 0, 255)); */
/*   m_nClientWidth = rcClient.right - rcClient.left; */
/*   m_nClientHeight = rcClient.bottom - rcClient.top; */

    /*  no real plotting work is performed here,  */
    /*  just putting the existing bitmaps on the client */

    /*  to avoid flicker, establish a memory dc, draw to it */
    /*  and then BitBlt it to the client */
    memDC = CreateCompatibleDC(dc);
    memBitmap = (HBITMAP)CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
    oldBitmap = (HBITMAP)SelectObject(memDC, memBitmap);

    if (memDC != NULL)
    {
        /*  first drop the grid on the memory dc */
        BitBlt(memDC, 0, 0, this->m_nClientWidth, this->m_nClientHeight, this->m_dcGrid, 0, 0, SRCCOPY);
        /*  now add the plot on top as a "pattern" via SRCPAINT. */
        /*  works well with dark background and a light plot */
        BitBlt(memDC, 0, 0, this->m_nClientWidth, this->m_nClientHeight, this->m_dcPlot, 0, 0, SRCPAINT);  /* SRCPAINT */
        /*  finally send the result to the display */
        BitBlt(dc, 0, 0, this->m_nClientWidth, this->m_nClientHeight, memDC, 0, 0, SRCCOPY);
    }
    SelectObject(memDC, oldBitmap);
    DeleteObject(memBitmap);
    DeleteDC(memDC);
}

void GraphCtrl_DrawPoint(TGraphCtrl* this)
{
    /*  this does the work of "scrolling" the plot to the left
     *  and appending a new data point all of the plotting is
     *  directed to the memory based bitmap associated with m_dcPlot
     *  the will subsequently be BitBlt'd to the client in Paint
     */
    int currX, prevX, currY, prevY;
    HPEN oldPen;
    RECT rectCleanUp;
    int i;

    if (this->m_dcPlot != NULL)
    {
        /*  shift the plot by BitBlt'ing it to itself
         *  note: the m_dcPlot covers the entire client
         *        but we only shift bitmap that is the size
         *        of the plot rectangle
         *  grab the right side of the plot (exluding m_nShiftPixels on the left)
         *  move this grabbed bitmap to the left by m_nShiftPixels
         */
        BitBlt(this->m_dcPlot, this->m_rectPlot.left, this->m_rectPlot.top+1,
               this->m_nPlotWidth, this->m_nPlotHeight, this->m_dcPlot,
               this->m_rectPlot.left+this->m_nShiftPixels, this->m_rectPlot.top+1,
               SRCCOPY);

        /*  establish a rectangle over the right side of plot */
        /*  which now needs to be cleaned up proir to adding the new point */
        rectCleanUp = this->m_rectPlot;
        rectCleanUp.left  = rectCleanUp.right - this->m_nShiftPixels;

        /*  fill the cleanup area with the background */
        FillRect(this->m_dcPlot, &rectCleanUp, this->m_brushBack);

        /*  draw the next line segement */
        for (i = 0; i < MAX_PLOTS; i++)
        {
            /*  grab the plotting pen */
            oldPen = (HPEN)SelectObject(this->m_dcPlot, this->m_penPlot[i]);

            /*  move to the previous point */
            prevX = this->m_rectPlot.right-this->m_nPlotShiftPixels;
            prevY = this->m_rectPlot.bottom -
                (long)((this->m_dPreviousPosition[i] - this->m_dLowerLimit) * this->m_dVerticalFactor);
            MoveToEx(this->m_dcPlot, prevX, prevY, NULL);

            /*  draw to the current point */
            currX = this->m_rectPlot.right-this->m_nHalfShiftPixels;
            currY = this->m_rectPlot.bottom -
                (long)((this->m_dCurrentPosition[i] - this->m_dLowerLimit) * this->m_dVerticalFactor);
            LineTo(this->m_dcPlot, currX, currY);

            /*  Restore the pen  */
            SelectObject(this->m_dcPlot, oldPen);

            /*  if the data leaks over the upper or lower plot boundaries
             *  fill the upper and lower leakage with the background
             *  this will facilitate clipping on an as needed basis
             *  as opposed to always calling IntersectClipRect
             */
            if ((prevY <= this->m_rectPlot.top) || (currY <= this->m_rectPlot.top))
            {
                RECT rc;
                rc.bottom = this->m_rectPlot.top+1;
                rc.left = prevX;
                rc.right = currX+1;
                rc.top = this->m_rectClient.top;
                FillRect(this->m_dcPlot, &rc, this->m_brushBack);
            }
            if ((prevY >= this->m_rectPlot.bottom) || (currY >= this->m_rectPlot.bottom))
            {
                RECT rc;
                rc.bottom = this->m_rectClient.bottom+1;
                rc.left = prevX;
                rc.right = currX+1;
                rc.top = this->m_rectPlot.bottom+1;
                /* RECT rc(prevX, m_rectPlot.bottom+1, currX+1, m_rectClient.bottom+1); */
                FillRect(this->m_dcPlot, &rc, this->m_brushBack);
            }

            /*  store the current point for connection to the next point */
            this->m_dPreviousPosition[i] = this->m_dCurrentPosition[i];
        }
    }
}

void GraphCtrl_Resize(TGraphCtrl* this)
{
    /*  NOTE: Resize automatically gets called during the setup of the control */
    GetClientRect(this->m_hWnd, &this->m_rectClient);

    /*  set some member variables to avoid multiple function calls */
    this->m_nClientHeight = this->m_rectClient.bottom - this->m_rectClient.top;/* m_rectClient.Height(); */
    this->m_nClientWidth  = this->m_rectClient.right - this->m_rectClient.left;/* m_rectClient.Width(); */

    /*  the "left" coordinate and "width" will be modified in  */
    /*  InvalidateCtrl to be based on the width of the y axis scaling */
#if 0
    this->m_rectPlot.left   = 20;
    this->m_rectPlot.top    = 10;
    this->m_rectPlot.right  = this->m_rectClient.right-10;
    this->m_rectPlot.bottom = this->m_rectClient.bottom-25;
#else
    this->m_rectPlot.left   = 0;
    this->m_rectPlot.top    = -1;
    this->m_rectPlot.right  = this->m_rectClient.right-0;
    this->m_rectPlot.bottom = this->m_rectClient.bottom-0;
#endif

    /*  set some member variables to avoid multiple function calls */
    this->m_nPlotHeight = this->m_rectPlot.bottom - this->m_rectPlot.top;/* m_rectPlot.Height(); */
    this->m_nPlotWidth  = this->m_rectPlot.right - this->m_rectPlot.left;/* m_rectPlot.Width(); */

    /*  set the scaling factor for now, this can be adjusted  */
    /*  in the SetRange functions */
    this->m_dVerticalFactor = (double)this->m_nPlotHeight / this->m_dRange;
}

#if 0
void TGraphCtrl::Reset()
{
    /*  to clear the existing data (in the form of a bitmap) */
    /*  simply invalidate the entire control */
    InvalidateCtrl();
}
#endif

extern TGraphCtrl PerformancePageCpuUsageHistoryGraph;
extern TGraphCtrl PerformancePageMemUsageHistoryGraph;
extern HWND hPerformancePageCpuUsageHistoryGraph;
extern HWND hPerformancePageMemUsageHistoryGraph;

INT_PTR CALLBACK
GraphCtrl_WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    RECT        rcClient;
    HDC            hdc;
    PAINTSTRUCT     ps;

    switch (message)
    {
    case WM_ERASEBKGND:
        return TRUE;
    /*
     *  Filter out mouse  & keyboard messages
     */
    /* case WM_APPCOMMAND: */
    case WM_CAPTURECHANGED:
    case WM_LBUTTONDBLCLK:
    case WM_LBUTTONDOWN:
    case WM_LBUTTONUP:
    case WM_MBUTTONDBLCLK:
    case WM_MBUTTONDOWN:
    case WM_MBUTTONUP:
    case WM_MOUSEACTIVATE:
    case WM_MOUSEHOVER:
    case WM_MOUSELEAVE:
    case WM_MOUSEMOVE:
    /* case WM_MOUSEWHEEL: */
    case WM_NCHITTEST:
    case WM_NCLBUTTONDBLCLK:
    case WM_NCLBUTTONDOWN:
    case WM_NCLBUTTONUP:
    case WM_NCMBUTTONDBLCLK:
    case WM_NCMBUTTONDOWN:
    case WM_NCMBUTTONUP:
    /* case WM_NCMOUSEHOVER: */
    /* case WM_NCMOUSELEAVE: */
    case WM_NCMOUSEMOVE:
    case WM_NCRBUTTONDBLCLK:
    case WM_NCRBUTTONDOWN:
    case WM_NCRBUTTONUP:
    /* case WM_NCXBUTTONDBLCLK: */
    /* case WM_NCXBUTTONDOWN: */
    /* case WM_NCXBUTTONUP: */
    case WM_RBUTTONDBLCLK:
    case WM_RBUTTONDOWN:
    case WM_RBUTTONUP:
    /* case WM_XBUTTONDBLCLK: */
    /* case WM_XBUTTONDOWN: */
    /* case WM_XBUTTONUP: */
    case WM_ACTIVATE:
    case WM_CHAR:
    case WM_DEADCHAR:
    case WM_GETHOTKEY:
    case WM_HOTKEY:
    case WM_KEYDOWN:
    case WM_KEYUP:
    case WM_KILLFOCUS:
    case WM_SETFOCUS:
    case WM_SETHOTKEY:
    case WM_SYSCHAR:
    case WM_SYSDEADCHAR:
    case WM_SYSKEYDOWN:
    case WM_SYSKEYUP:
        return 0;

    case WM_NCCALCSIZE:
        return 0;

    case WM_SIZE:
        if (hWnd == hPerformancePageMemUsageHistoryGraph)
        {
            GraphCtrl_Resize(&PerformancePageMemUsageHistoryGraph);
            GraphCtrl_InvalidateCtrl(&PerformancePageMemUsageHistoryGraph, TRUE);
        }
        if (hWnd == hPerformancePageCpuUsageHistoryGraph)
        {
            GraphCtrl_Resize(&PerformancePageCpuUsageHistoryGraph);
            GraphCtrl_InvalidateCtrl(&PerformancePageCpuUsageHistoryGraph, TRUE);
        }
        return 0;

    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        GetClientRect(hWnd, &rcClient);
        if (hWnd == hPerformancePageMemUsageHistoryGraph)
            GraphCtrl_Paint(&PerformancePageMemUsageHistoryGraph, hWnd, hdc);
        if (hWnd == hPerformancePageCpuUsageHistoryGraph)
            GraphCtrl_Paint(&PerformancePageCpuUsageHistoryGraph, hWnd, hdc);
        EndPaint(hWnd, &ps);
        return 0;
    }

    /*
     *  We pass on all non-handled messages
     */
    return CallWindowProc((WNDPROC)OldGraphCtrlWndProc, hWnd, message, wParam, lParam);
}