drawn.cpp

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

wxOpPolyDraw::~wxOpPolyDraw()
{
  delete[] m_points;
}

wxDrawOp *wxOpPolyDraw::Copy(wxPseudoMetaFile *WXUNUSED(newImage))
{
  wxRealPoint *newPoints = new wxRealPoint[m_noPoints];
  for (int i = 0; i < m_noPoints; i++)
  {
    newPoints[i].x = m_points[i].x;
    newPoints[i].y = m_points[i].y;
  }
  wxOpPolyDraw *newOp = new wxOpPolyDraw(m_op, m_noPoints, newPoints);
  return newOp;
}

void wxOpPolyDraw::Do(wxDC& dc, double xoffset, double yoffset)
{
  switch (m_op)
  {
    case DRAWOP_DRAW_POLYLINE:
    {
        wxPoint *actualPoints = new wxPoint[m_noPoints];
        int i;
        for (i = 0; i < m_noPoints; i++)
        {
            actualPoints[i].x = WXROUND(m_points[i].x);
            actualPoints[i].y = WXROUND(m_points[i].y);
        }

        dc.DrawLines(m_noPoints, actualPoints, WXROUND(xoffset), WXROUND(yoffset));

        delete[] actualPoints;
        break;
    }
    case DRAWOP_DRAW_POLYGON:
    {
        wxPoint *actualPoints = new wxPoint[m_noPoints];
        int i;
        for (i = 0; i < m_noPoints; i++)
        {
            actualPoints[i].x = WXROUND(m_points[i].x);
            actualPoints[i].y = WXROUND(m_points[i].y);
        }

        dc.DrawPolygon(m_noPoints, actualPoints, WXROUND(xoffset), WXROUND(yoffset));

        delete[] actualPoints;
        break;
    }
    case DRAWOP_DRAW_SPLINE:
    {
        wxPoint *actualPoints = new wxPoint[m_noPoints];
        int i;
        for (i = 0; i < m_noPoints; i++)
        {
            actualPoints[i].x = WXROUND(m_points[i].x);
            actualPoints[i].y = WXROUND(m_points[i].y);
        }

        dc.DrawSpline(m_noPoints, actualPoints); // no offsets in DrawSpline // , xoffset, yoffset);

        delete[] actualPoints;
        break;
    }
    default:
      break;
  }
}

void wxOpPolyDraw::Scale(double scaleX, double scaleY)
{
  for (int i = 0; i < m_noPoints; i++)
  {
    m_points[i].x *= scaleX;
    m_points[i].y *= scaleY;
  }
}

void wxOpPolyDraw::Translate(double x, double y)
{
  for (int i = 0; i < m_noPoints; i++)
  {
    m_points[i].x += x;
    m_points[i].y += y;
  }
}

void wxOpPolyDraw::Rotate(double x, double y, double WXUNUSED(theta), double sinTheta, double cosTheta)
{
  for (int i = 0; i < m_noPoints; i++)
  {
    double x1 = m_points[i].x;
    double y1 = m_points[i].y;
    m_points[i].x = x1*cosTheta - y1*sinTheta + x*(1.0 - cosTheta) + y*sinTheta;
    m_points[i].y = x1*sinTheta + y1*cosTheta + y*(1.0 - cosTheta) + x*sinTheta;
  }
}

#if wxUSE_PROLOGIO
wxExpr *wxOpPolyDraw::WriteExpr(wxPseudoMetaFile *WXUNUSED(image))
{
  wxExpr *expr = new wxExpr(wxExprList);
  expr->Append(new wxExpr((long)m_op));
  expr->Append(new wxExpr((long)m_noPoints));

//  char buf1[9];
  wxChar buf2[5];
  wxChar buf3[5];

  oglBuffer[0] = 0;

  /*
   * Store each coordinate pair in a hex string to save space.
   * E.g. "1B9080CD". 4 hex digits per coordinate pair.
   *
   */

  for (int i = 0; i < m_noPoints; i++)
  {
    long signedX = (long)(m_points[i].x*100.0);
    long signedY = (long)(m_points[i].y*100.0);

    // Scale to 0 -> 64K
    unsigned int unSignedX = (unsigned int)(signedX + 32767.0);
    unsigned int unSignedY = (unsigned int)(signedY + 32767.0);

    IntToHex(unSignedX, buf2);
    IntToHex(unSignedY, buf3);

    // Don't overrun the buffer
    if ((i*8) < 3000)
    {
      wxStrcat(oglBuffer, buf2);
      wxStrcat(oglBuffer, buf3);
    }
  }
  expr->Append(new wxExpr(wxExprString, oglBuffer));
  return expr;
}

void wxOpPolyDraw::ReadExpr(wxPseudoMetaFile *WXUNUSED(image), wxExpr *expr)
{
  m_noPoints = (int)expr->Nth(1)->IntegerValue();

  wxChar buf1[5];
  wxChar buf2[5];

  m_points = new wxRealPoint[m_noPoints];
  int i = 0;
  int bufPtr = 0;
  wxString hexString = expr->Nth(2)->StringValue();
  while (i < m_noPoints)
  {
    buf1[0] = hexString[(size_t)bufPtr];
    buf1[1] = hexString[(size_t)(bufPtr + 1)];
    buf1[2] = hexString[(size_t)(bufPtr + 2)];
    buf1[3] = hexString[(size_t)(bufPtr + 3)];
    buf1[4] = 0;

    buf2[0] = hexString[(size_t)(bufPtr + 4)];
    buf2[1] = hexString[(size_t)(bufPtr + 5)];
    buf2[2] = hexString[(size_t)(bufPtr + 6)];
    buf2[3] = hexString[(size_t)(bufPtr + 7)];
    buf2[4] = 0;

    bufPtr += 8;

//    int signedX = (signed int)HexToInt(buf1);
//    int signedY = (signed int)HexToInt(buf2);
    long unSignedX = HexToInt(buf1);
    long unSignedY = HexToInt(buf2);
    // Scale -32K -> +32K
    long signedX = unSignedX - 32767;
    long signedY = unSignedY - 32767;
#if defined(__WXMSW__) && 0
    int testX = (signed int)unSignedX;
    int testY = (signed int)unSignedY;
#endif

    m_points[i].x = (double)(signedX / 100.0);
    m_points[i].y = (double)(signedY / 100.0);

    i ++;
  }
}
#endif

// Draw an outline using the current operation.
bool wxOpPolyDraw::OnDrawOutline(wxDC& dc, double x, double y, double w, double h, double oldW, double oldH)
{
    dc.SetBrush(* wxTRANSPARENT_BRUSH);

    // Multiply all points by proportion of new size to old size
    double x_proportion = (double)(fabs(w/oldW));
    double y_proportion = (double)(fabs(h/oldH));

    int n = m_noPoints;
    wxPoint *intPoints = new wxPoint[n];
    int i;
    for (i = 0; i < n; i++)
    {
        intPoints[i].x = WXROUND (x_proportion * m_points[i].x);
        intPoints[i].y = WXROUND (y_proportion * m_points[i].y);
    }
    dc.DrawPolygon(n, intPoints, (long) x, (long) y);
    delete[] intPoints;
    return true;
}

// Assume (x1, y1) is centre of box (most generally, line end at box)
bool wxOpPolyDraw::GetPerimeterPoint(double x1, double y1,
                                     double x2, double y2,
                                     double *x3, double *y3,
                                     double xOffset, double yOffset,
                                     int attachmentMode)
{
  int n = m_noPoints;

  // First check for situation where the line is vertical,
  // and we would want to connect to a point on that vertical --
  // oglFindEndForPolyline can't cope with this (the arrow
  // gets drawn to the wrong place).
  if ((attachmentMode == ATTACHMENT_MODE_NONE) && (x1 == x2))
  {
    // Look for the point we'd be connecting to. This is
    // a heuristic...
    int i;
    for (i = 0; i < n; i++)
    {
      wxRealPoint *point = & (m_points[i]);
      if (point->x == 0.0)
      {
        if ((y2 > y1) && (point->y > 0.0))
        {
          *x3 = point->x + xOffset;
          *y3 = point->y + yOffset;
          return true;
        }
        else if ((y2 < y1) && (point->y < 0.0))
        {
          *x3 = point->x + xOffset;
          *y3 = point->y + yOffset;
          return true;
        }
      }
    }
  }

  double *xpoints = new double[n];
  double *ypoints = new double[n];

  for (int i = 0; i < n; i++)
  {
    wxRealPoint *point = & (m_points[i]);
    xpoints[i] = point->x + xOffset;
    ypoints[i] = point->y + yOffset;
  }

  oglFindEndForPolyline(n, xpoints, ypoints,
                        x1, y1, x2, y2, x3, y3);

  delete[] xpoints;
  delete[] ypoints;

  return true;
}


/*
 * Utilities
 *
 */

#if wxUSE_PROLOGIO

static char hexArray[] = {
    _T('0'), _T('1'), _T('2'), _T('3'), _T('4'), _T('5'), _T('6'), _T('7'),
    _T('8'), _T('9'), _T('A'), _T('B'), _T('C'), _T('D'), _T('E'), _T('F') };

// Convert unsigned 16-bit integer to 4-character hex string
static void IntToHex(unsigned int dec, wxChar *buf)
{
  int digit1 = (int)(dec/4096);
  int digit2 = (int)((dec - (digit1*4096))/256);
  int digit3 = (int)((dec - (digit1*4096) - (digit2*256))/16);
  int digit4 = dec - (digit1*4096 + digit2*256 + digit3*16);

  buf[0] = hexArray[digit1];
  buf[1] = hexArray[digit2];
  buf[2] = hexArray[digit3];
  buf[3] = hexArray[digit4];
  buf[4] = 0;
}

// One hex digit to decimal number
static int HexToInt1(wxChar hex)
{
  switch (hex)
  {
    case _T('0'):
      return 0;
    case _T('1'):
      return 1;
    case _T('2'):
      return 2;
    case _T('3'):
      return 3;
    case _T('4'):
      return 4;
    case _T('5'):
      return 5;
    case _T('6'):
      return 6;
    case _T('7'):
      return 7;
    case _T('8'):
      return 8;
    case _T('9'):
      return 9;
    case _T('A'):
      return 10;
    case _T('B'):
      return 11;
    case _T('C'):
      return 12;
    case _T('D'):
      return 13;
    case _T('E'):
      return 14;
    case _T('F'):
      return 15;
  }

  return 0;
}

// 4-digit hex string to unsigned integer
static unsigned long HexToInt(wxChar *buf)
{
  long d1 = (long)(HexToInt1(buf[0])*4096.0) ;
  long d2 = (long)(HexToInt1(buf[1])*256.0) ;
  long d3 = (long)(HexToInt1(buf[2])*16.0) ;
  long d4 = (long)(HexToInt1(buf[3])) ;
  unsigned long n = (long)(d1 + d2 + d3 + d4) ;
  return n;
}

#endif // wxUSE_PROLOGIO

/*
 * wxPseudo meta-file
 *
 */

IMPLEMENT_DYNAMIC_CLASS(wxPseudoMetaFile, wxObject)

wxPseudoMetaFile::wxPseudoMetaFile()
{
  m_currentRotation = 0;
  m_rotateable = true;
  m_width = 0.0;
  m_height = 0.0;
  m_outlinePen = NULL;
  m_fillBrush = NULL;
  m_outlineOp = -1;
}

wxPseudoMetaFile::wxPseudoMetaFile(wxPseudoMetaFile& mf):wxObject()
{
  mf.Copy(*this);
}

wxPseudoMetaFile::~wxPseudoMetaFile()
{
  Clear();
}

void wxPseudoMetaFile::Clear()
{
  wxNode *node = m_ops.GetFirst();
  while (node)
  {
    wxDrawOp *op = (wxDrawOp *)node->GetData();
    delete op;
    node = node->GetNext();
  }
  m_ops.Clear();
  m_gdiObjects.Clear();
  m_outlineColours.Clear();
  m_fillColours.Clear();
  m_outlineOp = -1;
}

void wxPseudoMetaFile::Draw(wxDC& dc, double xoffset, double yoffset)
{
  wxNode *node = m_ops.GetFirst();
  while (node)
  {
    wxDrawOp *op = (wxDrawOp *)node->GetData();
    op->Do(dc, xoffset, yoffset);
    node = node->GetNext();
  }
}

void wxPseudoMetaFile::Scale(double sx, double sy)
{
  wxNode *node = m_ops.GetFirst();
  while (node)
  {
    wxDrawOp *op = (wxDrawOp *)node->GetData();
    op->Scale(sx, sy);
    node = node->GetNext();
  }
  m_width *= sx;
  m_height *= sy;
}

void wxPseudoMetaFile::Translate(double x, double y)
{
  wxNode *node = m_ops.GetFirst();
  while (node)
  {
    wxDrawOp *op = (wxDrawOp *)node->GetData();
    op->Translate(x, y);
    node = node->GetNext();
  }
}

void wxPseudoMetaFile::Rotate(double x, double y, double theta)
{
  double theta1 = theta-m_currentRotation;
  if (theta1 == 0.0) return;
  double cosTheta = (double)cos(theta1);
  double sinTheta = (double)sin(theta1);

  wxNode *node = m_ops.GetFirst();
  while (node)
  {
    wxDrawOp *op = (wxDrawOp *)node->GetData();
    op->Rotate(x, y, theta, sinTheta, cosTheta);
    node = node->GetNext();
  }
  m_currentRotation = theta;
}

#if wxUSE_PROLOGIO
void wxPseudoMetaFile::WriteAttributes(wxExpr *clause, int whichAngle)
{
  wxString widthStr;
  widthStr.Printf(wxT("meta_width%d"), whichAngle);

  wxString heightStr;
  heightStr.Printf(wxT("meta_height%d"), whichAngle);

  wxString outlineStr;
  outlineStr.Printf(wxT("outline_op%d"), whichAngle);

  wxString rotateableStr;
  rotateableStr.Printf(wxT("meta_rotateable%d"), whichAngle);

  // Write width and height
  clause->AddAttributeValue(widthStr, m_width);
  clause->AddAttributeValue(heightStr, m_height);
  clause->AddAttributeValue(rotateableStr, (long)m_rotateable);
  clause->AddAttributeValue(outlineStr, (long)m_outlineOp);

  // Write GDI objects
  wxChar buf[50];
  int i = 1;
  wxNode *node = m_gdiObjects.GetFirst();
  while (node)
  {
    wxSprintf(buf, _T("gdi%d_%d"), whichAngle, i);
    wxObject *obj = (wxObject *)node->GetData();
    wxExpr *expr = NULL;
    if (obj)
    {
      if (obj->IsKindOf(CLASSINFO(wxPen)))
      {
        wxPen *thePen = (wxPen *)obj;
        expr = new wxExpr(wxExprList);
        expr->Append(new wxExpr((long)gyTYPE_PEN));
        expr->Append(new wxExpr((long)thePen->GetWidth()));
        expr->Append(new wxExpr((long)thePen->GetStyle()));
        expr->Append(new wxExpr((long)thePen->GetColour().Red()));
        expr->Append(new wxExpr((long)thePen->GetColour().Green()));
        expr->Append(new wxExpr((long)thePen->GetColour().Blue()));
      }
      else if (obj->IsKindOf(CLASSINFO(wxBrush)))
      {
        wxBrush *theBrush = (wxBrush *)obj;
        expr = new wxExpr(wxExprList);
        expr->Append(new wxExpr((long)gyTYPE_BRUSH));
        expr->Append(new wxExpr((long)theBrush->GetStyle()));
        expr->Append(new wxExpr((long)theBrush->GetColour().Red()));
        expr->Append(new wxExpr((long)theBrush->GetColour().Green()));