oglmisc.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

/////////////////////////////////////////////////////////////////////////////
// Name:        misc.cpp
// Purpose:     Miscellaneous OGL support functions
// Author:      Julian Smart
// Modified by:
// Created:     12/07/98
// RCS-ID:      $Id: oglmisc.cpp,v 1.21 2005/10/06 18:17:23 ABX Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#if wxUSE_PROLOGIO
#include "wx/deprecated/wxexpr.h"
#endif

#include "wx/types.h"

#ifdef new
#undef new
#endif

#include <ctype.h>
#include <math.h>
#include <stdlib.h>

#include "wx/ogl/ogl.h"


wxFont*         g_oglNormalFont;
wxPen*          g_oglBlackPen;
wxPen*          g_oglWhiteBackgroundPen;
wxPen*          g_oglTransparentPen;
wxBrush*        g_oglWhiteBackgroundBrush;
wxPen*          g_oglBlackForegroundPen;
wxCursor*       g_oglBullseyeCursor = NULL;

wxChar*           oglBuffer = NULL;

wxList          oglObjectCopyMapping(wxKEY_INTEGER);



void wxOGLInitialize()
{
  g_oglBullseyeCursor = new wxCursor(wxCURSOR_BULLSEYE);

  g_oglNormalFont = new wxFont(10, wxSWISS, wxNORMAL, wxNORMAL);

  g_oglBlackPen = new wxPen(wxT("BLACK"), 1, wxSOLID);

  g_oglWhiteBackgroundPen = new wxPen(wxT("WHITE"), 1, wxSOLID);
  g_oglTransparentPen = new wxPen(wxT("WHITE"), 1, wxTRANSPARENT);
  g_oglWhiteBackgroundBrush = new wxBrush(wxT("WHITE"), wxSOLID);
  g_oglBlackForegroundPen = new wxPen(wxT("BLACK"), 1, wxSOLID);

  OGLInitializeConstraintTypes();

  // Initialize big buffer used when writing images
  oglBuffer = new wxChar[3000];

}

void wxOGLCleanUp()
{
    if (oglBuffer)
    {
        delete[] oglBuffer;
        oglBuffer = NULL;
    }
    oglBuffer = NULL;

    if (g_oglBullseyeCursor)
    {
        delete g_oglBullseyeCursor;
        g_oglBullseyeCursor = NULL;
    }

    if (g_oglNormalFont)
    {
        delete g_oglNormalFont;
        g_oglNormalFont = NULL;
    }
    if (g_oglBlackPen)
    {
        delete g_oglBlackPen;
        g_oglBlackPen = NULL;
    }
    if (g_oglWhiteBackgroundPen)
    {
        delete g_oglWhiteBackgroundPen;
        g_oglWhiteBackgroundPen = NULL;
    }
    if (g_oglTransparentPen)
    {
        delete g_oglTransparentPen;
        g_oglTransparentPen = NULL;
    }
    if (g_oglWhiteBackgroundBrush)
    {
        delete g_oglWhiteBackgroundBrush;
        g_oglWhiteBackgroundBrush = NULL;
    }
    if (g_oglBlackForegroundPen)
    {
        delete g_oglBlackForegroundPen;
        g_oglBlackForegroundPen = NULL;
    }

    OGLCleanUpConstraintTypes();
}

wxFont *oglMatchFont(int point_size)
{
  wxFont *font = wxTheFontList->FindOrCreateFont(point_size, wxSWISS, wxNORMAL, wxNORMAL);
#if 0
  switch (point_size)
  {
    case 4:
      font = swiss_font_4;
      break;
    case 6:
      font = swiss_font_6;
      break;
    case 8:
      font = swiss_font_8;
      break;
    case 12:
      font = swiss_font_12;
      break;
    case 14:
      font = swiss_font_14;
      break;
    case 18:
      font = swiss_font_18;
      break;
    case 24:
      font = swiss_font_24;
      break;
    default:
    case 10:
      font = swiss_font_10;
      break;
  }
#endif
  return font;
}

int FontSizeDialog(wxFrame *parent, int old_size)
{
  if (old_size <= 0)
    old_size = 10;
  wxString buf;
  buf << old_size;
  wxString ans = wxGetTextFromUser(wxT("Enter point size"), wxT("Font size"), buf, parent);
  if (ans.Length() == 0)
    return 0;

  long new_size = 0;
  ans.ToLong(&new_size);
  if ((new_size <= 0) || (new_size > 40))
  {
    wxMessageBox(wxT("Invalid point size!"), wxT("Error"), wxOK);
    return 0;
  }
  return new_size;
/*
  char *strings[8];
  strings[0] = "4";
  strings[1] = "6";
  strings[2] = "8";
  strings[3] = "10";
  strings[4] = "12";
  strings[5] = "14";
  strings[6] = "18";
  strings[7] = "24";
  char *ans = wxGetSingleChoice("Choose", "Choose a font size", 8, strings, parent);
  if (ans)
  {
    int size;
    sscanf(ans, "%d", &size);
    return oglMatchFont(size);
  }
  else return NULL;
*/
}

// Centre a list of strings in the given box. xOffset and yOffset are the
// the positions that these lines should be relative to, and this might be
// the same as m_xpos, m_ypos, but might be zero if formatting from left-justifying.
void oglCentreText(wxDC& dc, wxList *text_list,
                double m_xpos, double m_ypos, double width, double height,
                int formatMode)
{
  int n = text_list->GetCount();

  if (!text_list || (n == 0))
    return;

  // First, get maximum dimensions of box enclosing text

  long char_height = 0;
  long max_width = 0;
  long current_width = 0;

  // Store text extents for speed
  double *widths = new double[n];

  wxObjectList::compatibility_iterator current = text_list->GetFirst();
  int i = 0;
  while (current)
  {
    wxShapeTextLine *line = (wxShapeTextLine *)current->GetData();
    dc.GetTextExtent(line->GetText(), &current_width, &char_height);
    widths[i] = current_width;

    if (current_width > max_width)
      max_width = current_width;
    current = current->GetNext();
    i ++;
  }

  double max_height = n*char_height;

  double xoffset, yoffset, xOffset, yOffset;

  if (formatMode & FORMAT_CENTRE_VERT)
  {
    if (max_height < height)
      yoffset = (double)(m_ypos - (height/2.0) + (height - max_height)/2.0);
    else
      yoffset = (double)(m_ypos - (height/2.0));
    yOffset = m_ypos;
  }
  else
  {
    yoffset = 0.0;
    yOffset = 0.0;
  }

  if (formatMode & FORMAT_CENTRE_HORIZ)
  {
    xoffset = (double)(m_xpos - width/2.0);
    xOffset = m_xpos;
  }
  else
  {
    xoffset = 0.0;
    xOffset = 0.0;
  }

  current = text_list->GetFirst();
  i = 0;

  while (current)
  {
    wxShapeTextLine *line = (wxShapeTextLine *)current->GetData();

    double x;
    if ((formatMode & FORMAT_CENTRE_HORIZ) && (widths[i] < width))
      x = (double)((width - widths[i])/2.0 + xoffset);
    else
      x = xoffset;
    double y = (double)(i*char_height + yoffset);

    line->SetX( x - xOffset ); line->SetY( y - yOffset );
    current = current->GetNext();
    i ++;
  }

  delete[] widths;
}

// Centre a list of strings in the given box
void oglCentreTextNoClipping(wxDC& dc, wxList *text_list,
                              double m_xpos, double m_ypos, double width, double height)
{
  int n = text_list->GetCount();

  if (!text_list || (n == 0))
    return;

  // First, get maximum dimensions of box enclosing text

  long char_height = 0;
  long max_width = 0;
  long current_width = 0;

  // Store text extents for speed
  double *widths = new double[n];

  wxObjectList::compatibility_iterator current = text_list->GetFirst();
  int i = 0;
  while (current)
  {
    wxShapeTextLine *line = (wxShapeTextLine *)current->GetData();
    dc.GetTextExtent(line->GetText(), &current_width, &char_height);
    widths[i] = current_width;

    if (current_width > max_width)
      max_width = current_width;
    current = current->GetNext();
    i ++;
  }

  double max_height = n*char_height;

  double yoffset = (double)(m_ypos - (height/2.0) + (height - max_height)/2.0);

  double xoffset = (double)(m_xpos - width/2.0);

  current = text_list->GetFirst();
  i = 0;

  while (current)
  {
    wxShapeTextLine *line = (wxShapeTextLine *)current->GetData();

    double x = (double)((width - widths[i])/2.0 + xoffset);
    double y = (double)(i*char_height + yoffset);

    line->SetX( x - m_xpos ); line->SetY( y - m_ypos );
    current = current->GetNext();
    i ++;
  }
  delete widths;
}

void oglGetCentredTextExtent(wxDC& dc, wxList *text_list,
                              double WXUNUSED(m_xpos), double WXUNUSED(m_ypos), double WXUNUSED(width), double WXUNUSED(height),
                              double *actual_width, double *actual_height)
{
  int n = text_list->GetCount();

  if (!text_list || (n == 0))
  {
    *actual_width = 0;
    *actual_height = 0;
    return;
  }

  // First, get maximum dimensions of box enclosing text

  long char_height = 0;
  long max_width = 0;
  long current_width = 0;

  wxObjectList::compatibility_iterator current = text_list->GetFirst();
  while (current)
  {
    wxShapeTextLine *line = (wxShapeTextLine *)current->GetData();
    dc.GetTextExtent(line->GetText(), &current_width, &char_height);

    if (current_width > max_width)
      max_width = current_width;
    current = current->GetNext();
  }

  *actual_height = n*char_height;
  *actual_width = max_width;
}

// Format a string to a list of strings that fit in the given box.
// Interpret %n and 10 or 13 as a new line.
wxStringList *oglFormatText(wxDC& dc, const wxString& text, double width, double WXUNUSED(height), int formatMode)
{
  // First, parse the string into a list of words
  wxStringList word_list;

  // Make new lines into NULL strings at this point
  int i = 0; int j = 0; int len = text.Length();
  wxChar word[400]; word[0] = 0;
  bool end_word = false; bool new_line = false;
  while (i < len)
  {
    switch (text[i])
    {
      case wxT('%'):
      {
        i ++;
        if (i == len)
        { word[j] = wxT('%'); j ++; }
        else
        {
          if (text[i] == wxT('n'))
          { new_line = true; end_word = true; i++; }
          else
          { word[j] = wxT('%'); j ++; word[j] = text[i]; j ++; i ++; }
        }
        break;
      }
      case 10:
      {
        new_line = true; end_word = true; i++;
        break;
      }
      case 13:
      {
        new_line = true; end_word = true; i++;
        break;
      }
      case wxT(' '):
      {
        end_word = true;
        i ++;
        break;
      }
      default:
      {
        word[j] = text[i];
        j ++; i ++;
        break;
      }
    }
    if (i == len) end_word = true;
    if (end_word)
    {
      word[j] = 0;
      j = 0;
      word_list.Add(word);
      end_word = false;
    }
    if (new_line)
    {
      word_list.Append(NULL);
      new_line = false;
    }
  }
  // Now, make a list of strings which can fit in the box
  wxStringList *string_list = new wxStringList;

  wxString buffer;
  wxStringList::compatibility_iterator node = word_list.GetFirst();
  long x, y;

  while (node)
  {