programs/taskmgr/graphctl.c

   1 /*
   2  *  ReactOS Task Manager
   3  *
   4  *  graphctl.c
   5  *
   6  *  Copyright (C) 2002  Robert Dickenson <robd@reactos.org>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #define WIN32_LEAN_AND_MEAN        /* Exclude rarely-used stuff from Windows headers */
  24 #include <windows.h>
  25 #include <commctrl.h>
  26 #include <stdlib.h>
  27 #include <memory.h>
  28 #include <tchar.h>
  29 #include <stdio.h>
  30
  31 #include <math.h>
  32 #include "graphctl.h"
  33 #include "taskmgr.h"
  34
  35 WNDPROC OldGraphCtrlWndProc;
  36
  37 static void GraphCtrl_Init(TGraphCtrl* this)
  38 {
  39     int i;
  40
  41     this->m_hWnd = 0;
  42     this->m_hParentWnd = 0;
  43     this->m_dcGrid = 0;
  44     this->m_dcPlot = 0;
  45     this->m_bitmapOldGrid = 0;
  46     this->m_bitmapOldPlot = 0;
  47     this->m_bitmapGrid = 0;
  48     this->m_bitmapPlot = 0;
  49     this->m_brushBack = 0;
  50
  51     this->m_penPlot[0] = 0;
  52     this->m_penPlot[1] = 0;
  53     this->m_penPlot[2] = 0;
  54     this->m_penPlot[3] = 0;
  55
  56     /* since plotting is based on a LineTo for each new point
  57      * we need a starting point (i.e. a "previous" point)
  58      * use 0.0 as the default first point.
  59      * these are public member variables, and can be changed outside
  60      * (after construction).  Therefore m_perviousPosition could be set to
  61      * a more appropriate value prior to the first call to SetPosition.
  62      */
  63     this->m_dPreviousPosition[0] = 0.0;
  64     this->m_dPreviousPosition[1] = 0.0;
  65     this->m_dPreviousPosition[2] = 0.0;
  66     this->m_dPreviousPosition[3] = 0.0;
  67
  68     /*  public variable for the number of decimal places on the y axis */
  69     this->m_nYDecimals = 3;
  70
  71     /*  set some initial values for the scaling until "SetRange" is called.
  72      *  these are protected varaibles and must be set with SetRange
  73      *  in order to ensure that m_dRange is updated accordingly
  74      */
  75     /*   m_dLowerLimit = -10.0; */
  76     /*   m_dUpperLimit =  10.0; */
  77     this->m_dLowerLimit = 0.0;
  78     this->m_dUpperLimit = 100.0;
  79     this->m_dRange      =  this->m_dUpperLimit - this->m_dLowerLimit;   /*  protected member variable */
  80
  81     /*  m_nShiftPixels determines how much the plot shifts (in terms of pixels)  */
  82     /*  with the addition of a new data point */
  83     this->m_nShiftPixels     = 4;
  84     this->m_nHalfShiftPixels = this->m_nShiftPixels/2;                     /*  protected */
  85     this->m_nPlotShiftPixels = this->m_nShiftPixels + this->m_nHalfShiftPixels;  /*  protected */
  86
  87     /*  background, grid and data colors */
  88     /*  these are public variables and can be set directly */
  89     this->m_crBackColor = RGB(  0,   0,   0);  /*  see also SetBackgroundColor */
  90     this->m_crGridColor = RGB(  0, 255, 255);  /*  see also SetGridColor */
  91     this->m_crPlotColor[0] = RGB(255, 255, 255);  /*  see also SetPlotColor */
  92     this->m_crPlotColor[1] = RGB(100, 255, 255);  /*  see also SetPlotColor */
  93     this->m_crPlotColor[2] = RGB(255, 100, 255);  /*  see also SetPlotColor */
  94     this->m_crPlotColor[3] = RGB(255, 255, 100);  /*  see also SetPlotColor */
  95
  96     /*  protected variables */
  97     for (i = 0; i < MAX_PLOTS; i++)
  98     {
  99         this->m_penPlot[i] = CreatePen(PS_SOLID, 0, this->m_crPlotColor[i]);
 100     }
 101     this->m_brushBack = CreateSolidBrush(this->m_crBackColor);
 102
 103     /*  public member variables, can be set directly  */
 104     strcpy(this->m_strXUnitsString, "Samples");  /*  can also be set with SetXUnits */
 105     strcpy(this->m_strYUnitsString, "Y units");  /*  can also be set with SetYUnits */
 106
 107     /*  protected bitmaps to restore the memory DC's */
 108     this->m_bitmapOldGrid = NULL;
 109     this->m_bitmapOldPlot = NULL;
 110 }
 111
 112 #if 0
 113 TGraphCtrl::~TGraphCtrl(void)
 114 {
 115     /*  just to be picky restore the bitmaps for the two memory dc's */
 116     /*  (these dc's are being destroyed so there shouldn't be any leaks) */
 117     if (m_bitmapOldGrid != NULL) SelectObject(m_dcGrid, m_bitmapOldGrid);
 118     if (m_bitmapOldPlot != NULL) SelectObject(m_dcPlot, m_bitmapOldPlot);
 119     if (m_bitmapGrid    != NULL) DeleteObject(m_bitmapGrid);
 120     if (m_bitmapPlot    != NULL) DeleteObject(m_bitmapPlot);
 121     if (m_dcGrid        != NULL) DeleteDC(m_dcGrid);
 122     if (m_dcPlot        != NULL) DeleteDC(m_dcPlot);
 123     if (m_brushBack     != NULL) DeleteObject(m_brushBack);
 124 }
 125 #endif
 126
 127 static void GraphCtrl_Resize(TGraphCtrl* this)
 128 {
 129     /*  NOTE: Resize automatically gets called during the setup of the control */
 130     GetClientRect(this->m_hWnd, &this->m_rectClient);
 131
 132     /*  set some member variables to avoid multiple function calls */
 133     this->m_nClientHeight = this->m_rectClient.bottom - this->m_rectClient.top;/* m_rectClient.Height(); */
 134     this->m_nClientWidth  = this->m_rectClient.right - this->m_rectClient.left;/* m_rectClient.Width(); */
 135
 136     /*  the "left" coordinate and "width" will be modified in  */
 137     /*  InvalidateCtrl to be based on the width of the y axis scaling */
 138 #if 0
 139     this->m_rectPlot.left   = 20;
 140     this->m_rectPlot.top    = 10;
 141     this->m_rectPlot.right  = this->m_rectClient.right-10;
 142     this->m_rectPlot.bottom = this->m_rectClient.bottom-25;
 143 #else
 144     this->m_rectPlot.left   = 0;
 145     this->m_rectPlot.top    = -1;
 146     this->m_rectPlot.right  = this->m_rectClient.right-0;
 147     this->m_rectPlot.bottom = this->m_rectClient.bottom-0;
 148 #endif
 149
 150     /*  set some member variables to avoid multiple function calls */
 151     this->m_nPlotHeight = this->m_rectPlot.bottom - this->m_rectPlot.top;/* m_rectPlot.Height(); */
 152     this->m_nPlotWidth  = this->m_rectPlot.right - this->m_rectPlot.left;/* m_rectPlot.Width(); */
 153
 154     /*  set the scaling factor for now, this can be adjusted  */
 155     /*  in the SetRange functions */
 156     this->m_dVerticalFactor = (double)this->m_nPlotHeight / this->m_dRange;
 157 }
 158
 159 BOOL GraphCtrl_Create(TGraphCtrl* this, HWND hWnd, HWND hParentWnd, UINT nID)
 160 {
 161     GraphCtrl_Init(this);
 162     this->m_hParentWnd = hParentWnd;
 163     this->m_hWnd = hWnd;
 164     GraphCtrl_Resize(this);
 165     return 0;
 166 }
 167
 168 static void GraphCtrl_InvalidateCtrl(TGraphCtrl* this)
 169 {
 170     /*  There is a lot of drawing going on here - particularly in terms of  */
 171     /*  drawing the grid.  Don't panic, this is all being drawn (only once) */
 172     /*  to a bitmap.  The result is then BitBlt'd to the control whenever needed. */
 173     int i, j;
 174     int nCharacters;
 175     int nTopGridPix, nMidGridPix, nBottomGridPix;
 176
 177     HPEN oldPen;
 178     HPEN solidPen = CreatePen(PS_SOLID, 0, this->m_crGridColor);
 179     /* HFONT axisFont, yUnitFont, oldFont; */
 180     /* char strTemp[50]; */
 181
 182     /*  in case we haven't established the memory dc's */
 183     /* CClientDC dc(this); */
 184     HDC dc = GetDC(this->m_hParentWnd);
 185
 186     /*  if we don't have one yet, set up a memory dc for the grid */
 187     if (this->m_dcGrid == NULL)
 188     {
 189         this->m_dcGrid = CreateCompatibleDC(dc);
 190         this->m_bitmapGrid = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
 191         this->m_bitmapOldGrid = SelectObject(this->m_dcGrid, this->m_bitmapGrid);
 192     }
 193
 194     SetBkColor(this->m_dcGrid, this->m_crBackColor);
 195
 196     /*  fill the grid background */
 197     FillRect(this->m_dcGrid, &this->m_rectClient, this->m_brushBack);
 198
 199     /*  draw the plot rectangle: */
 200     /*  determine how wide the y axis scaling values are */
 201     nCharacters = abs((int)log10(fabs(this->m_dUpperLimit)));
 202     nCharacters = max(nCharacters, abs((int)log10(fabs(this->m_dLowerLimit))));
 203
 204     /*  add the units digit, decimal point and a minus sign, and an extra space */
 205     /*  as well as the number of decimal places to display */
 206     nCharacters = nCharacters + 4 + this->m_nYDecimals;
 207
 208     /*  adjust the plot rectangle dimensions */
 209     /*  assume 6 pixels per character (this may need to be adjusted) */
 210     /*   m_rectPlot.left = m_rectClient.left + 6*(nCharacters); */
 211     this->m_rectPlot.left = this->m_rectClient.left;
 212     this->m_nPlotWidth    = this->m_rectPlot.right - this->m_rectPlot.left;/* m_rectPlot.Width(); */
 213
 214     /*  draw the plot rectangle */
 215     oldPen = SelectObject(this->m_dcGrid, solidPen);
 216     MoveToEx(this->m_dcGrid, this->m_rectPlot.left, this->m_rectPlot.top, NULL);
 217     LineTo(this->m_dcGrid, this->m_rectPlot.right+1, this->m_rectPlot.top);
 218     LineTo(this->m_dcGrid, this->m_rectPlot.right+1, this->m_rectPlot.bottom+1);
 219     LineTo(this->m_dcGrid, this->m_rectPlot.left, this->m_rectPlot.bottom+1);
 220     /*   LineTo(m_dcGrid, m_rectPlot.left, m_rectPlot.top); */
 221     SelectObject(this->m_dcGrid, oldPen);
 222     DeleteObject(solidPen);
 223
 224     /*  draw the dotted lines,
 225      *  use SetPixel instead of a dotted pen - this allows for a
 226      *  finer dotted line and a more "technical" look
 227      */
 228     nMidGridPix    = (this->m_rectPlot.top + this->m_rectPlot.bottom)/2;
 229     nTopGridPix    = nMidGridPix - this->m_nPlotHeight/4;
 230     nBottomGridPix = nMidGridPix + this->m_nPlotHeight/4;
 231
 232     for (i=this->m_rectPlot.left; i<this->m_rectPlot.right; i+=2)
 233     {
 234         SetPixel(this->m_dcGrid, i, nTopGridPix,    this->m_crGridColor);
 235         SetPixel(this->m_dcGrid, i, nMidGridPix,    this->m_crGridColor);
 236         SetPixel(this->m_dcGrid, i, nBottomGridPix, this->m_crGridColor);
 237     }
 238
 239     for (i=this->m_rectPlot.left; i<this->m_rectPlot.right; i+=10)
 240     {
 241         for (j=this->m_rectPlot.top; j<this->m_rectPlot.bottom; j+=2)
 242         {
 243             SetPixel(this->m_dcGrid, i, j, this->m_crGridColor);
 244             /*       SetPixel(m_dcGrid, i, j, m_crGridColor); */
 245             /*       SetPixel(m_dcGrid, i, j, m_crGridColor); */
 246         }
 247     }
 248
 249 #if 0
 250     /*  create some fonts (horizontal and vertical) */
 251     /*  use a height of 14 pixels and 300 weight  */
 252     /*  (these may need to be adjusted depending on the display) */
 253     axisFont = CreateFont (14, 0, 0, 0, 300,
 254                            FALSE, FALSE, 0, ANSI_CHARSET,
 255                            OUT_DEFAULT_PRECIS,
 256                            CLIP_DEFAULT_PRECIS,
 257                            DEFAULT_QUALITY,
 258                            DEFAULT_PITCH|FF_SWISS, "Arial");
 259     yUnitFont = CreateFont (14, 0, 900, 0, 300,
 260                             FALSE, FALSE, 0, ANSI_CHARSET,
 261                             OUT_DEFAULT_PRECIS,
 262                             CLIP_DEFAULT_PRECIS,
 263                             DEFAULT_QUALITY,
 264                             DEFAULT_PITCH|FF_SWISS, "Arial");
 265
 266     /*  grab the horizontal font */
 267     oldFont = SelectObject(m_dcGrid, axisFont);
 268
 269     /*  y max */
 270     SetTextColor(m_dcGrid, m_crGridColor);
 271     SetTextAlign(m_dcGrid, TA_RIGHT|TA_TOP);
 272     sprintf(strTemp, "%.*lf", m_nYDecimals, m_dUpperLimit);
 273     TextOut(m_dcGrid, m_rectPlot.left-4, m_rectPlot.top, strTemp, _tcslen(strTemp));
 274
 275     /*  y min */
 276     SetTextAlign(m_dcGrid, TA_RIGHT|TA_BASELINE);
 277     sprintf(strTemp, "%.*lf", m_nYDecimals, m_dLowerLimit);
 278     TextOut(m_dcGrid, m_rectPlot.left-4, m_rectPlot.bottom, strTemp, _tcslen(strTemp));
 279
 280     /*  x min */
 281     SetTextAlign(m_dcGrid, TA_LEFT|TA_TOP);
 282     TextOut(m_dcGrid, m_rectPlot.left, m_rectPlot.bottom+4, "0", 1);
 283
 284     /*  x max */
 285     SetTextAlign(m_dcGrid, TA_RIGHT|TA_TOP);
 286     sprintf(strTemp, "%d", m_nPlotWidth/m_nShiftPixels);
 287     TextOut(m_dcGrid, m_rectPlot.right, m_rectPlot.bottom+4, strTemp, _tcslen(strTemp));
 288
 289     /*  x units */
 290     SetTextAlign(m_dcGrid, TA_CENTER|TA_TOP);
 291     TextOut(m_dcGrid, (m_rectPlot.left+m_rectPlot.right)/2,
 292             m_rectPlot.bottom+4, m_strXUnitsString, _tcslen(m_strXUnitsString));
 293
 294     /*  restore the font */
 295     SelectObject(m_dcGrid, oldFont);
 296
 297     /*  y units */
 298     oldFont = SelectObject(m_dcGrid, yUnitFont);
 299     SetTextAlign(m_dcGrid, TA_CENTER|TA_BASELINE);
 300     TextOut(m_dcGrid, (m_rectClient.left+m_rectPlot.left)/2,
 301             (m_rectPlot.bottom+m_rectPlot.top)/2, m_strYUnitsString, _tcslen(m_strYUnitsString));
 302     SelectObject(m_dcGrid, oldFont);
 303 #endif
 304     /*  at this point we are done filling the grid bitmap,  */
 305     /*  no more drawing to this bitmap is needed until the settings are changed */
 306
 307     /*  if we don't have one yet, set up a memory dc for the plot */
 308     if (this->m_dcPlot == NULL)
 309     {
 310         this->m_dcPlot = CreateCompatibleDC(dc);
 311         this->m_bitmapPlot = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
 312         this->m_bitmapOldPlot = SelectObject(this->m_dcPlot, this->m_bitmapPlot);
 313     }
 314
 315     /*  make sure the plot bitmap is cleared */
 316     SetBkColor(this->m_dcPlot, this->m_crBackColor);
 317     FillRect(this->m_dcPlot, &this->m_rectClient, this->m_brushBack);
 318
 319     /*  finally, force the plot area to redraw */
 320     InvalidateRect(this->m_hParentWnd, &this->m_rectClient, TRUE);
 321     ReleaseDC(this->m_hParentWnd, dc);
 322 }
 323
 324 void GraphCtrl_SetRange(TGraphCtrl* this, double dLower, double dUpper, int nDecimalPlaces)
 325 {
 326     /* ASSERT(dUpper > dLower); */
 327     this->m_dLowerLimit     = dLower;
 328     this->m_dUpperLimit     = dUpper;
 329     this->m_nYDecimals      = nDecimalPlaces;
 330     this->m_dRange          = this->m_dUpperLimit - this->m_dLowerLimit;
 331     this->m_dVerticalFactor = (double)this->m_nPlotHeight / this->m_dRange;
 332     /*  clear out the existing garbage, re-start with a clean plot */
 333     GraphCtrl_InvalidateCtrl(this);
 334 }
 335
 336 #if 0
 337 void TGraphCtrl::SetXUnits(const char* string)
 338 {
 339     lstrcpynA(m_strXUnitsString, string, sizeof(m_strXUnitsString));
 340     /*  clear out the existing garbage, re-start with a clean plot */
 341     InvalidateCtrl();
 342 }
 343
 344 void TGraphCtrl::SetYUnits(const char* string)
 345 {
 346     lstrcpynA(m_strYUnitsString, string, sizeof(m_strYUnitsString));
 347     /*  clear out the existing garbage, re-start with a clean plot */
 348     InvalidateCtrl();
 349 }
 350 #endif
 351
 352 void GraphCtrl_SetGridColor(TGraphCtrl* this, COLORREF color)
 353 {
 354     this->m_crGridColor = color;
 355     /*  clear out the existing garbage, re-start with a clean plot */
 356     GraphCtrl_InvalidateCtrl(this);
 357 }
 358
 359 void GraphCtrl_SetPlotColor(TGraphCtrl* this, int plot, COLORREF color)
 360 {
 361     this->m_crPlotColor[plot] = color;
 362     DeleteObject(this->m_penPlot[plot]);
 363     this->m_penPlot[plot] = CreatePen(PS_SOLID, 0, this->m_crPlotColor[plot]);
 364     /*  clear out the existing garbage, re-start with a clean plot */
 365     GraphCtrl_InvalidateCtrl(this);
 366 }
 367
 368 void GraphCtrl_SetBackgroundColor(TGraphCtrl* this, COLORREF color)
 369 {
 370     this->m_crBackColor = color;
 371     DeleteObject(this->m_brushBack);
 372     this->m_brushBack = CreateSolidBrush(this->m_crBackColor);
 373     /*  clear out the existing garbage, re-start with a clean plot */
 374     GraphCtrl_InvalidateCtrl(this);
 375 }
 376
 377 static void GraphCtrl_DrawPoint(TGraphCtrl* this)
 378 {
 379     /*  this does the work of "scrolling" the plot to the left
 380      *  and appending a new data point all of the plotting is
 381      *  directed to the memory based bitmap associated with m_dcPlot
 382      *  the will subsequently be BitBlt'd to the client in Paint
 383      */
 384     int currX, prevX, currY, prevY;
 385     HPEN oldPen;
 386     RECT rectCleanUp;
 387     int i;
 388
 389     if (this->m_dcPlot != NULL)
 390     {
 391         /*  shift the plot by BitBlt'ing it to itself
 392          *  note: the m_dcPlot covers the entire client
 393          *        but we only shift bitmap that is the size
 394          *        of the plot rectangle
 395          *  grab the right side of the plot (excluding m_nShiftPixels on the left)
 396          *  move this grabbed bitmap to the left by m_nShiftPixels
 397          */
 398         BitBlt(this->m_dcPlot, this->m_rectPlot.left, this->m_rectPlot.top+1,
 399                this->m_nPlotWidth, this->m_nPlotHeight, this->m_dcPlot,
 400                this->m_rectPlot.left+this->m_nShiftPixels, this->m_rectPlot.top+1,
 401                SRCCOPY);
 402
 403         /*  establish a rectangle over the right side of plot */
 404         /*  which now needs to be cleaned up proir to adding the new point */
 405         rectCleanUp = this->m_rectPlot;
 406         rectCleanUp.left  = rectCleanUp.right - this->m_nShiftPixels;
 407
 408         /*  fill the cleanup area with the background */
 409         FillRect(this->m_dcPlot, &rectCleanUp, this->m_brushBack);
 410
 411         /*  draw the next line segment */
 412         for (i = 0; i < MAX_PLOTS; i++)
 413         {
 414             /*  grab the plotting pen */
 415             oldPen = SelectObject(this->m_dcPlot, this->m_penPlot[i]);
 416
 417             /*  move to the previous point */
 418             prevX = this->m_rectPlot.right-this->m_nPlotShiftPixels;
 419             prevY = this->m_rectPlot.bottom -
 420                 (int)((this->m_dPreviousPosition[i] - this->m_dLowerLimit) * this->m_dVerticalFactor);
 421             MoveToEx(this->m_dcPlot, prevX, prevY, NULL);
 422
 423             /*  draw to the current point */
 424             currX = this->m_rectPlot.right-this->m_nHalfShiftPixels;
 425             currY = this->m_rectPlot.bottom -
 426                 (int)((this->m_dCurrentPosition[i] - this->m_dLowerLimit) * this->m_dVerticalFactor);
 427             LineTo(this->m_dcPlot, currX, currY);
 428
 429             /*  Restore the pen  */
 430             SelectObject(this->m_dcPlot, oldPen);
 431
 432             /*  if the data leaks over the upper or lower plot boundaries
 433              *  fill the upper and lower leakage with the background
 434              *  this will facilitate clipping on an as needed basis
 435              *  as opposed to always calling IntersectClipRect
 436              */
 437             if ((prevY <= this->m_rectPlot.top) || (currY <= this->m_rectPlot.top))
 438             {
 439                 RECT rc;
 440                 rc.bottom = this->m_rectPlot.top+1;
 441                 rc.left = prevX;
 442                 rc.right = currX+1;
 443                 rc.top = this->m_rectClient.top;
 444                 FillRect(this->m_dcPlot, &rc, this->m_brushBack);
 445             }
 446             if ((prevY >= this->m_rectPlot.bottom) || (currY >= this->m_rectPlot.bottom))
 447             {
 448                 RECT rc;
 449                 rc.bottom = this->m_rectClient.bottom+1;
 450                 rc.left = prevX;
 451                 rc.right = currX+1;
 452                 rc.top = this->m_rectPlot.bottom+1;
 453                 /* RECT rc(prevX, m_rectPlot.bottom+1, currX+1, m_rectClient.bottom+1); */
 454                 FillRect(this->m_dcPlot, &rc, this->m_brushBack);
 455             }
 456
 457             /*  store the current point for connection to the next point */
 458             this->m_dPreviousPosition[i] = this->m_dCurrentPosition[i];
 459         }
 460     }
 461 }
 462
 463 double GraphCtrl_AppendPoint(TGraphCtrl* this,
 464                              double dNewPoint0, double dNewPoint1,
 465                              double dNewPoint2, double dNewPoint3)
 466 {
 467     /*  append a data point to the plot & return the previous point */
 468     double dPrevious;
 469
 470     dPrevious = this->m_dCurrentPosition[0];
 471     this->m_dCurrentPosition[0] = dNewPoint0;
 472     this->m_dCurrentPosition[1] = dNewPoint1;
 473     this->m_dCurrentPosition[2] = dNewPoint2;
 474     this->m_dCurrentPosition[3] = dNewPoint3;
 475     GraphCtrl_DrawPoint(this);
 476     /* Invalidate(); */
 477     return dPrevious;
 478 }
 479
 480 static void GraphCtrl_Paint(TGraphCtrl* this, HWND hWnd, HDC dc)
 481 {
 482     HDC memDC;
 483     HBITMAP memBitmap;
 484     HBITMAP oldBitmap; /*  bitmap originally found in CMemDC */
 485
 486 /*   RECT rcClient; */
 487 /*   GetClientRect(hWnd, &rcClient); */
 488 /*   FillSolidRect(dc, &rcClient, RGB(255, 0, 255)); */
 489 /*   m_nClientWidth = rcClient.right - rcClient.left; */
 490 /*   m_nClientHeight = rcClient.bottom - rcClient.top; */
 491
 492     /*  no real plotting work is performed here,  */
 493     /*  just putting the existing bitmaps on the client */
 494
 495     /*  to avoid flicker, establish a memory dc, draw to it */
 496     /*  and then BitBlt it to the client */
 497     memDC = CreateCompatibleDC(dc);
 498     memBitmap = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
 499     oldBitmap = SelectObject(memDC, memBitmap);
 500
 501     if (memDC != NULL)
 502     {
 503         /*  first drop the grid on the memory dc */
 504         BitBlt(memDC, 0, 0, this->m_nClientWidth, this->m_nClientHeight, this->m_dcGrid, 0, 0, SRCCOPY);
 505         /*  now add the plot on top as a "pattern" via SRCPAINT. */
 506         /*  works well with dark background and a light plot */
 507         BitBlt(memDC, 0, 0, this->m_nClientWidth, this->m_nClientHeight, this->m_dcPlot, 0, 0, SRCPAINT);  /* SRCPAINT */
 508         /*  finally send the result to the display */
 509         BitBlt(dc, 0, 0, this->m_nClientWidth, this->m_nClientHeight, memDC, 0, 0, SRCCOPY);
 510     }
 511     SelectObject(memDC, oldBitmap);
 512     DeleteObject(memBitmap);
 513     DeleteDC(memDC);
 514 }
 515
 516 #if 0
 517 void TGraphCtrl::Reset(void)
 518 {
 519     /*  to clear the existing data (in the form of a bitmap) */
 520     /*  simply invalidate the entire control */
 521     InvalidateCtrl();
 522 }
 523 #endif
 524
 525 extern TGraphCtrl PerformancePageCpuUsageHistoryGraph;
 526 extern TGraphCtrl PerformancePageMemUsageHistoryGraph;
 527 extern HWND hPerformancePageCpuUsageHistoryGraph;
 528 extern HWND hPerformancePageMemUsageHistoryGraph;
 529
 530 INT_PTR CALLBACK
 531 GraphCtrl_WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 532 {
 533     RECT        rcClient;
 534     HDC            hdc;
 535     PAINTSTRUCT     ps;
 536
 537     switch (message)
 538     {
 539     case WM_ERASEBKGND:
 540         return TRUE;
 541     /*
 542      *  Filter out mouse  & keyboard messages
 543      */
 544     /* case WM_APPCOMMAND: */
 545     case WM_CAPTURECHANGED:
 546     case WM_LBUTTONDBLCLK:
 547     case WM_LBUTTONDOWN:
 548     case WM_LBUTTONUP:
 549     case WM_MBUTTONDBLCLK:
 550     case WM_MBUTTONDOWN:
 551     case WM_MBUTTONUP:
 552     case WM_MOUSEACTIVATE:
 553     case WM_MOUSEHOVER:
 554     case WM_MOUSELEAVE:
 555     case WM_MOUSEMOVE:
 556     /* case WM_MOUSEWHEEL: */
 557     case WM_NCHITTEST:
 558     case WM_NCLBUTTONDBLCLK:
 559     case WM_NCLBUTTONDOWN:
 560     case WM_NCLBUTTONUP:
 561     case WM_NCMBUTTONDBLCLK:
 562     case WM_NCMBUTTONDOWN:
 563     case WM_NCMBUTTONUP:
 564     /* case WM_NCMOUSEHOVER: */
 565     /* case WM_NCMOUSELEAVE: */
 566     case WM_NCMOUSEMOVE:
 567     case WM_NCRBUTTONDBLCLK:
 568     case WM_NCRBUTTONDOWN:
 569     case WM_NCRBUTTONUP:
 570     /* case WM_NCXBUTTONDBLCLK: */
 571     /* case WM_NCXBUTTONDOWN: */
 572     /* case WM_NCXBUTTONUP: */
 573     case WM_RBUTTONDBLCLK:
 574     case WM_RBUTTONDOWN:
 575     case WM_RBUTTONUP:
 576     /* case WM_XBUTTONDBLCLK: */
 577     /* case WM_XBUTTONDOWN: */
 578     /* case WM_XBUTTONUP: */
 579     case WM_ACTIVATE:
 580     case WM_CHAR:
 581     case WM_DEADCHAR:
 582     case WM_GETHOTKEY:
 583     case WM_HOTKEY:
 584     case WM_KEYDOWN:
 585     case WM_KEYUP:
 586     case WM_KILLFOCUS:
 587     case WM_SETFOCUS:
 588     case WM_SETHOTKEY:
 589     case WM_SYSCHAR:
 590     case WM_SYSDEADCHAR:
 591     case WM_SYSKEYDOWN:
 592     case WM_SYSKEYUP:
 593         return 0;
 594
 595     case WM_NCCALCSIZE:
 596         return 0;
 597
 598     case WM_SIZE:
 599         if (hWnd == hPerformancePageMemUsageHistoryGraph)
 600         {
 601             GraphCtrl_Resize(&PerformancePageMemUsageHistoryGraph);
 602             GraphCtrl_InvalidateCtrl(&PerformancePageMemUsageHistoryGraph);
 603         }
 604         if (hWnd == hPerformancePageCpuUsageHistoryGraph)
 605         {
 606             GraphCtrl_Resize(&PerformancePageCpuUsageHistoryGraph);
 607             GraphCtrl_InvalidateCtrl(&PerformancePageCpuUsageHistoryGraph);
 608         }
 609         return 0;
 610
 611     case WM_PAINT:
 612         hdc = BeginPaint(hWnd, &ps);
 613         GetClientRect(hWnd, &rcClient);
 614         if (hWnd == hPerformancePageMemUsageHistoryGraph)
 615             GraphCtrl_Paint(&PerformancePageMemUsageHistoryGraph, hWnd, hdc);
 616         if (hWnd == hPerformancePageCpuUsageHistoryGraph)
 617             GraphCtrl_Paint(&PerformancePageCpuUsageHistoryGraph, hWnd, hdc);
 618         EndPaint(hWnd, &ps);
 619         return 0;
 620     }
 621
 622     /*
 623      *  We pass on all non-handled messages
 624      */
 625     return CallWindowProc((WNDPROC)OldGraphCtrlWndProc, hWnd, message, wParam, lParam);
 626 }