justify2.c

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/*-----------------------------------------
   JUSTIFY2.C -- Justified Type Program #2
                 (c) Charles Petzold, 1998
  -----------------------------------------*/

#include <windows.h>
#include "resource.h"

#define OUTWIDTH 6       // Width of formatted output in inches
#define LASTCHAR 127     // Last character code used in text

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

TCHAR szAppName[] = TEXT ("Justify2") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     HWND     hwnd ;
     MSG      msg ;
     WNDCLASS wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = szAppName ;
     wndclass.lpszClassName = szAppName ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
               szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("Justified Type #2"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

void DrawRuler (HDC hdc, RECT * prc)
{
     static int iRuleSize [16] = { 360, 72, 144, 72, 216, 72, 144, 72,
                                   288, 72, 144, 72, 216, 72, 144, 72 } ;
     int        i, j ;
     POINT      ptClient ;
     
     SaveDC (hdc) ;
     
          // Set Logical Twips mapping mode
     
     SetMapMode (hdc, MM_ANISOTROPIC) ;
     SetWindowExtEx (hdc, 1440, 1440, NULL) ;
     SetViewportExtEx (hdc, GetDeviceCaps (hdc, LOGPIXELSX),
                            GetDeviceCaps (hdc, LOGPIXELSY), NULL) ;
     
          // Move the origin to a half inch from upper left
     
     SetWindowOrgEx (hdc, -720, -720, NULL) ;
     
          // Find the right margin (quarter inch from right)
     
     ptClient.x = prc->right ;
     ptClient.y = prc->bottom ;
     DPtoLP (hdc, &ptClient, 1) ;
     ptClient.x -= 360 ;
     
          // Draw the rulers
     
     MoveToEx (hdc, 0,               -360, NULL) ;
     LineTo   (hdc, OUTWIDTH * 1440, -360) ;
     MoveToEx (hdc, -360,               0, NULL) ;
     LineTo   (hdc, -360,      ptClient.y) ;
     
     for (i = 0, j = 0 ; i <= ptClient.x && i <= OUTWIDTH * 1440 ;
                         i += 1440 / 16, j++)
     {
          MoveToEx (hdc, i, -360, NULL) ;
          LineTo   (hdc, i, -360 - iRuleSize [j % 16]) ;
     }
     
     for (i = 0, j = 0 ; i <= ptClient.y ; i += 1440 / 16, j++)
     {
          MoveToEx (hdc, -360, i, NULL) ;
          LineTo   (hdc, -360 - iRuleSize [j % 16], i) ;
     }
     
     RestoreDC (hdc, -1) ;
}

/*----------------------------------------------------------------------
   GetCharDesignWidths:  Gets character widths for font as large as the
                         original design size
  ----------------------------------------------------------------------*/

UINT GetCharDesignWidths (HDC hdc, UINT uFirst, UINT uLast, int * piWidths)
{
     HFONT             hFont, hFontDesign ;
     LOGFONT           lf ;
     OUTLINETEXTMETRIC otm ;

     hFont = GetCurrentObject (hdc, OBJ_FONT) ;
     GetObject (hFont, sizeof (LOGFONT), &lf) ;

          // Get outline text metrics (we'll only be using a field that is
          //   independent of the DC the font is selected into)

     otm.otmSize = sizeof (OUTLINETEXTMETRIC) ;
     GetOutlineTextMetrics (hdc, sizeof (OUTLINETEXTMETRIC), &otm) ;

          // Create a new font based on the design size

     lf.lfHeight = - (int) otm.otmEMSquare ;
     lf.lfWidth  = 0 ;
     hFontDesign = CreateFontIndirect (&lf) ;

          // Select the font into the DC and get the character widths

     SaveDC (hdc) ;
     SetMapMode (hdc, MM_TEXT) ;
     SelectObject (hdc, hFontDesign) ;

     GetCharWidth (hdc, uFirst, uLast, piWidths) ;
     SelectObject (hdc, hFont) ;
     RestoreDC (hdc, -1) ;

          // Clean up

     DeleteObject (hFontDesign) ;

     return otm.otmEMSquare ;
}

/*---------------------------------------------------------------------
   GetScaledWidths:  Gets floating point character widths for selected
                     font size
  ---------------------------------------------------------------------*/

void GetScaledWidths (HDC hdc, double * pdWidths)
{
     double  dScale ;
     HFONT   hFont ;
     int     aiDesignWidths [LASTCHAR + 1] ;
     int     i ;
     LOGFONT lf ;
     UINT    uEMSquare ;

          // Call function above

     uEMSquare = GetCharDesignWidths (hdc, 0, LASTCHAR, aiDesignWidths) ;

          // Get LOGFONT for current font in device context

     hFont = GetCurrentObject (hdc, OBJ_FONT) ;
     GetObject (hFont, sizeof (LOGFONT), &lf) ;

          // Scale the widths and store as floating point values

     dScale = (double) -lf.lfHeight / (double) uEMSquare ;

     for (i = 0 ; i <= LASTCHAR ; i++)
          pdWidths[i] = dScale * aiDesignWidths[i] ;
}

/*--------------------------------------------------------------
   GetTextExtentFloat:  Calculates text width in floating point
  --------------------------------------------------------------*/

double GetTextExtentFloat (double * pdWidths, PTSTR psText, int iCount)
{
     double dWidth = 0 ;
     int    i ;

     for (i = 0 ; i < iCount ; i++)
          dWidth += pdWidths [psText[i]] ;

     return dWidth ;
}

/*------------------------------------------------------------------
   Justify:  Based on design units for screen/printer compatibility
  ------------------------------------------------------------------*/

void Justify (HDC hdc, PTSTR pText, RECT * prc, int iAlign)
{
     double dWidth, adWidths[LASTCHAR + 1] ;
     int    xStart, yStart, cSpaceChars ;
     PTSTR  pBegin, pEnd ;
     SIZE   size ;

          // Fill the adWidths array with floating point character widths

     GetScaledWidths (hdc, adWidths) ;

     yStart = prc->top ;
     do                            // for each text line
     {
          cSpaceChars = 0 ;        // initialize number of spaces in line

          while (*pText == ' ')    // skip over leading spaces
               pText++ ;

          pBegin = pText ;         // set pointer to char at beginning of line
          
          do                       // until the line is known
          {
               pEnd = pText ;      // set pointer to char at end of line

                    // skip to next space 
               
               while (*pText != '\0' && *pText++ != ' ') ;

               if (*pText == '\0')
                    break ;

                    // after each space encountered, calculate extents

               cSpaceChars++ ;
               dWidth = GetTextExtentFloat (adWidths, pBegin, 
                                                      pText - pBegin - 1) ;
          }
          while (dWidth < (double) (prc->right - prc->left)) ;
          
          cSpaceChars-- ;               // discount last space at end of line
          
          while (*(pEnd - 1) == ' ')    // eliminate trailing spaces
          {
               pEnd-- ;
               cSpaceChars-- ;
          }