lines.cpp

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

    wxExpr *y_expr = new wxExpr((double) point->y);
    point_list->Append(x_expr);
    point_list->Append(y_expr);
    list->Append(point_list);

    node = node->GetNext();
  }
  clause->AddAttributeValue(_T("controls"), list);

  // Write arc arrows in new OGL format, if there are any.
  // This is a list of lists. Each sublist comprises:
  // (arrowType arrowEnd xOffset arrowSize)
  if (m_arcArrows.GetCount() > 0)
  {
    wxExpr *arrow_list = new wxExpr(wxExprList);
    node = m_arcArrows.GetFirst();
    while (node)
    {
      wxArrowHead *head = (wxArrowHead *)node->GetData();
      wxExpr *head_list = new wxExpr(wxExprList);
      head_list->Append(new wxExpr((long)head->_GetType()));
      head_list->Append(new wxExpr((long)head->GetArrowEnd()));
      head_list->Append(new wxExpr(head->GetXOffset()));
      head_list->Append(new wxExpr(head->GetArrowSize()));
      head_list->Append(new wxExpr(wxExprString, head->GetName()));
      head_list->Append(new wxExpr(head->GetId()));

      // New members of wxArrowHead
      head_list->Append(new wxExpr(head->GetYOffset()));
      head_list->Append(new wxExpr(head->GetSpacing()));

      arrow_list->Append(head_list);

      node = node->GetNext();
    }
    clause->AddAttributeValue(_T("arrows"), arrow_list);
  }
}

void wxLineShape::ReadAttributes(wxExpr *clause)
{
  wxShape::ReadAttributes(clause);

  int iVal = (int) m_isSpline;
  clause->AssignAttributeValue(wxT("is_spline"), &iVal);
  m_isSpline = (iVal != 0);

  iVal = (int) m_maintainStraightLines;
  clause->AssignAttributeValue(wxT("keep_lines_straight"), &iVal);
  m_maintainStraightLines = (iVal != 0);

  clause->AssignAttributeValue(wxT("align_start"), &m_alignmentStart);
  clause->AssignAttributeValue(wxT("align_end"), &m_alignmentEnd);

  // Compatibility: check for no regions.
  if (m_regions.GetCount() == 0)
  {
    wxShapeRegion *newRegion = new wxShapeRegion;
    newRegion->SetName(_T("Middle"));
    newRegion->SetSize(150, 50);
    m_regions.Append((wxObject *)newRegion);
    if (m_text.GetCount() > 0)
    {
      newRegion->ClearText();
      wxNode *node = m_text.GetFirst();
      while (node)
      {
        wxShapeTextLine *textLine = (wxShapeTextLine *)node->GetData();
        wxNode *next = node->GetNext();
        newRegion->GetFormattedText().Append((wxObject *)textLine);
        delete node;
        node = next;
      }
    }

    newRegion = new wxShapeRegion;
    newRegion->SetName(wxT("Start"));
    newRegion->SetSize(150, 50);
    m_regions.Append((wxObject *)newRegion);

    newRegion = new wxShapeRegion;
    newRegion->SetName(wxT("End"));
    newRegion->SetSize(150, 50);
    m_regions.Append((wxObject *)newRegion);
  }

  m_attachmentTo = 0;
  m_attachmentFrom = 0;

  clause->AssignAttributeValue(wxT("attachment_to"), &m_attachmentTo);
  clause->AssignAttributeValue(wxT("attachment_from"), &m_attachmentFrom);

  wxExpr *line_list = NULL;

  // When image is created, there are default control points. Override
  // them if there are some in the file.
  clause->AssignAttributeValue(wxT("controls"), &line_list);

  if (line_list)
  {
    // Read a list of lists for the spline controls
    if (m_lineControlPoints)
    {
      ClearPointList(*m_lineControlPoints);
    }
    else
      m_lineControlPoints = new wxList;

    wxExpr *node = line_list->value.first;

    while (node)
    {
      wxExpr *xexpr = node->value.first;
      double x = xexpr->RealValue();

      wxExpr *yexpr = xexpr->next;
      double y = yexpr->RealValue();

      wxRealPoint *point = new wxRealPoint(x, y);
      m_lineControlPoints->Append((wxObject*) point);

      node = node->next;
    }
  }

  // Read arrow list, for new OGL code
  wxExpr *arrow_list = NULL;

  clause->AssignAttributeValue(wxT("arrows"), &arrow_list);
  if (arrow_list)
  {
    wxExpr *node = arrow_list->value.first;

    while (node)
    {
      WXTYPE arrowType = ARROW_ARROW;
      int arrowEnd = 0;
      double xOffset = 0.0;
      double arrowSize = 0.0;
      wxString arrowName;
      long arrowId = -1;

      wxExpr *type_expr = node->Nth(0);
      wxExpr *end_expr = node->Nth(1);
      wxExpr *dist_expr = node->Nth(2);
      wxExpr *size_expr = node->Nth(3);
      wxExpr *name_expr = node->Nth(4);
      wxExpr *id_expr = node->Nth(5);

      // New members of wxArrowHead
      wxExpr *yOffsetExpr = node->Nth(6);
      wxExpr *spacingExpr = node->Nth(7);

      if (type_expr)
          arrowType = (WXTYPE)type_expr->IntegerValue();
      if (end_expr)
        arrowEnd = (int)end_expr->IntegerValue();
      if (dist_expr)
        xOffset = dist_expr->RealValue();
      if (size_expr)
        arrowSize = size_expr->RealValue();
      if (name_expr)
        arrowName = name_expr->StringValue();
      if (id_expr)
        arrowId = id_expr->IntegerValue();

      if (arrowId == -1)
        arrowId = wxNewId();
      else
        wxRegisterId(arrowId);

      wxArrowHead *arrowHead = AddArrow(arrowType, arrowEnd, arrowSize, xOffset, arrowName, NULL, arrowId);
      if (yOffsetExpr)
        arrowHead->SetYOffset(yOffsetExpr->RealValue());
      if (spacingExpr)
        arrowHead->SetSpacing(spacingExpr->RealValue());

      node = node->next;
    }
  }
}
#endif

void wxLineShape::Copy(wxShape& copy)
{
  wxShape::Copy(copy);

  wxASSERT( copy.IsKindOf(CLASSINFO(wxLineShape)) );

  wxLineShape& lineCopy = (wxLineShape&) copy;

  lineCopy.m_to = m_to;
  lineCopy.m_from = m_from;
  lineCopy.m_attachmentTo = m_attachmentTo;
  lineCopy.m_attachmentFrom = m_attachmentFrom;
  lineCopy.m_isSpline = m_isSpline;
  lineCopy.m_alignmentStart = m_alignmentStart;
  lineCopy.m_alignmentEnd = m_alignmentEnd;
  lineCopy.m_maintainStraightLines = m_maintainStraightLines;
  lineCopy.m_lineOrientations.Clear();

  wxNode *node = m_lineOrientations.GetFirst();
  while (node)
  {
    lineCopy.m_lineOrientations.Append(node->GetData());
    node = node->GetNext();
  }

  if (lineCopy.m_lineControlPoints)
  {
    ClearPointList(*lineCopy.m_lineControlPoints);
    delete lineCopy.m_lineControlPoints;
  }

  lineCopy.m_lineControlPoints = new wxList;

  node = m_lineControlPoints->GetFirst();
  while (node)
  {
    wxRealPoint *point = (wxRealPoint *)node->GetData();
    wxRealPoint *new_point = new wxRealPoint(point->x, point->y);
    lineCopy.m_lineControlPoints->Append((wxObject*) new_point);
    node = node->GetNext();
  }

  // Copy arrows
  lineCopy.ClearArrowsAtPosition(-1);
  node = m_arcArrows.GetFirst();
  while (node)
  {
    wxArrowHead *arrow = (wxArrowHead *)node->GetData();
    lineCopy.m_arcArrows.Append(new wxArrowHead(*arrow));
    node = node->GetNext();
  }
}

// Override select, to create/delete temporary label-moving objects
void wxLineShape::Select(bool select, wxDC* dc)
{
  wxShape::Select(select, dc);
  if (select)
  {
    for (int i = 0; i < 3; i++)
    {
      wxNode *node = m_regions.Item(i);
      if (node)
      {
        wxShapeRegion *region = (wxShapeRegion *)node->GetData();
        if (region->m_formattedText.GetCount() > 0)
        {
          double w, h, x, y, xx, yy;
          region->GetSize(&w, &h);
          region->GetPosition(&x, &y);
          GetLabelPosition(i, &xx, &yy);
          if (m_labelObjects[i])
          {
            m_labelObjects[i]->Select(false);
            m_labelObjects[i]->RemoveFromCanvas(m_canvas);
            delete m_labelObjects[i];
          }
          m_labelObjects[i] = OnCreateLabelShape(this, region, w, h);
          m_labelObjects[i]->AddToCanvas(m_canvas);
          m_labelObjects[i]->Show(true);
          if (dc)
            m_labelObjects[i]->Move(*dc, (double)(x + xx), (double)(y + yy));
          m_labelObjects[i]->Select(true, dc);
        }
      }
    }
  }
  else
  {
    for (int i = 0; i < 3; i++)
    {
      if (m_labelObjects[i])
      {
        m_labelObjects[i]->Select(false, dc);
        m_labelObjects[i]->Erase(*dc);
        m_labelObjects[i]->RemoveFromCanvas(m_canvas);
        delete m_labelObjects[i];
        m_labelObjects[i] = NULL;
      }
    }
  }
}

/*
 * Line control point
 *
 */

IMPLEMENT_DYNAMIC_CLASS(wxLineControlPoint, wxControlPoint)

wxLineControlPoint::wxLineControlPoint(wxShapeCanvas *theCanvas, wxShape *object, double size, double x, double y, int the_type):
  wxControlPoint(theCanvas, object, size, x, y, the_type)
{
  m_xpos = x;
  m_ypos = y;
  m_type = the_type;
  m_point = NULL;
}

wxLineControlPoint::~wxLineControlPoint()
{
}

void wxLineControlPoint::OnDraw(wxDC& dc)
{
  wxRectangleShape::OnDraw(dc);
}

// Implement movement of Line point
void wxLineControlPoint::OnDragLeft(bool draw, double x, double y, int keys, int attachment)
{
    m_shape->GetEventHandler()->OnSizingDragLeft(this, draw, x, y, keys, attachment);
}

void wxLineControlPoint::OnBeginDragLeft(double x, double y, int keys, int attachment)
{
    m_shape->GetEventHandler()->OnSizingBeginDragLeft(this, x, y, keys, attachment);
}

void wxLineControlPoint::OnEndDragLeft(double x, double y, int keys, int attachment)
{
    m_shape->GetEventHandler()->OnSizingEndDragLeft(this, x, y, keys, attachment);
}

// Control points ('handles') redirect control to the actual shape, to make it easier
// to override sizing behaviour.
void wxLineShape::OnSizingDragLeft(wxControlPoint* pt, bool WXUNUSED(draw), double x, double y, int WXUNUSED(keys), int WXUNUSED(attachment))
{
  wxLineControlPoint* lpt = (wxLineControlPoint*) pt;

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  dc.SetLogicalFunction(OGLRBLF);

  wxPen dottedPen(*wxBLACK, 1, wxDOT);
  dc.SetPen(dottedPen);
  dc.SetBrush((* wxTRANSPARENT_BRUSH));

  if (lpt->m_type == CONTROL_POINT_LINE)
  {
    m_canvas->Snap(&x, &y);

    lpt->SetX(x); lpt->SetY(y);
    lpt->m_point->x = x; lpt->m_point->y = y;

    wxLineShape *lineShape = (wxLineShape *)this;

    const wxPen *old_pen = lineShape->GetPen();
    const wxBrush *old_brush = lineShape->GetBrush();

    wxPen dottedPen(*wxBLACK, 1, wxDOT);
    lineShape->SetPen(& dottedPen);
    lineShape->SetBrush(wxTRANSPARENT_BRUSH);

    lineShape->GetEventHandler()->OnMoveLink(dc, false);

    lineShape->SetPen(old_pen);
    lineShape->SetBrush(old_brush);
  }

  if (lpt->m_type == CONTROL_POINT_ENDPOINT_FROM || lpt->m_type == CONTROL_POINT_ENDPOINT_TO)
  {
//    lpt->SetX(x); lpt->SetY(y);
  }

}

void wxLineShape::OnSizingBeginDragLeft(wxControlPoint* pt, double x, double y, int WXUNUSED(keys), int WXUNUSED(attachment))
{
  wxLineControlPoint* lpt = (wxLineControlPoint*) pt;

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  wxLineShape *lineShape = (wxLineShape *)this;
  if (lpt->m_type == CONTROL_POINT_LINE)
  {
    lpt->m_originalPos = * (lpt->m_point);
    m_canvas->Snap(&x, &y);

    this->Erase(dc);

    // Redraw start and end objects because we've left holes
    // when erasing the line
    lineShape->GetFrom()->OnDraw(dc);
    lineShape->GetFrom()->OnDrawContents(dc);
    lineShape->GetTo()->OnDraw(dc);
    lineShape->GetTo()->OnDrawContents(dc);

    this->SetDisableLabel(true);
    dc.SetLogicalFunction(OGLRBLF);

    lpt->m_xpos = x; lpt->m_ypos = y;
    lpt->m_point->x = x; lpt->m_point->y = y;

    const wxPen *old_pen = lineShape->GetPen();
    const wxBrush *old_brush = lineShape->GetBrush();

    wxPen dottedPen(*wxBLACK, 1, wxDOT);
    lineShape->SetPen(& dottedPen);
    lineShape->SetBrush(wxTRANSPARENT_BRUSH);

    lineShape->GetEventHandler()->OnMoveLink(dc, false);

    lineShape->SetPen(old_pen);
    lineShape->SetBrush(old_brush);
  }

  if (lpt->m_type == CONTROL_POINT_ENDPOINT_FROM || lpt->m_type == CONTROL_POINT_ENDPOINT_TO)
  {
    m_canvas->SetCursor(wxCursor(wxCURSOR_BULLSEYE));
    lpt->m_oldCursor = wxSTANDARD_CURSOR;
  }
}

void wxLineShape::OnSizingEndDragLeft(wxControlPoint* pt, double x, double y, int WXUNUSED(keys), int WXUNUSED(attachment))
{
  wxLineControlPoint* lpt = (wxLineControlPoint*) pt;

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  this->SetDisableLabel(false);
  wxLineShape *lineShape = (wxLineShape *)this;

  if (lpt->m_type == CONTROL_POINT_LINE)
  {
    m_canvas->Snap(&x, &y);

    wxRealPoint pt = wxRealPoint(x, y);

    // Move the control point back to where it was;
    // MoveControlPoint will move it to the new position
    // if it decides it wants. We only moved the position
    // during user feedback so we could redraw the line
    // as it changed shape.
    lpt->m_xpos = lpt->m_originalPos.x; lpt->m_ypos = lpt->m_originalPos.y;
    lpt->m_point->x = lpt->m_originalPos.x; lpt->m_point->y = lpt->m_originalPos.y;

    OnMoveMiddleControlPoint(dc, lpt, pt);
  }
  if (lpt->m_type == CONTROL_POINT_ENDPOINT_FROM)
  {
    if (lpt->m_oldCursor)
      m_canvas->SetCursor(* lpt->m_oldCursor);

//    this->Erase(dc);

//    lpt->m_xpos = x; lpt->m_ypos = y;

    if (lineShape->GetFrom())
    {
      lineShape->GetFrom()->MoveLineToNewAttachment(dc, lineShape, x, y);
    }
  }
  if (lpt->m_type == CONTROL_POINT_ENDPOINT_TO)
  {
    if (lpt->m_oldCursor)
      m_canvas->SetCursor(* lpt->m_oldCursor);