用C++写的一个简单的界面演示系统
void CMiniDrawDoc::AddFigure (CFigure *PFigure)
{
m_FigArray.Add (PFigure);
SetModifiedFlag ();
}
CFigure *CMiniDrawDoc::GetFigure (int Index)
{
if (Index m_FigArray.GetUpperBound ())
return 0;
return (CFigure *)m_FigArray.GetAt (Index);
}
int CMiniDrawDoc::GetNumFigs ()
{
return m_FigArray.GetSize ();
}
void CMiniDrawDoc::DeleteContents()
{
// TODO: Add your specialized code here and/or call the base class
int Index = m_FigArray.GetSize ();
while (Index--)
delete m_FigArray.GetAt (Index);
m_FigArray.RemoveAll ();
CDocument::DeleteContents();
}
void CMiniDrawDoc::OnEditClearAll()
{
// TODO: Add your command handler code here
DeleteContents ();
UpdateAllViews (0);
SetModifiedFlag ();
}
void CMiniDrawDoc::OnUpdateEditClearAll(CCmdUI* pCmdUI)
{
// TODO: Add your command update UI handler code here
pCmdUI->Enable (m_FigArray.GetSize ());
}
void CMiniDrawDoc::OnEditUndo()
{
// TODO: Add your command handler code here
int Index = m_FigArray.GetUpperBound ();
if (Index > -1)
{
delete m_FigArray.GetAt (Index);
m_FigArray.RemoveAt (Index);
}
UpdateAllViews (0);
SetModifiedFlag ();
}
void CMiniDrawDoc::OnUpdateEditUndo(CCmdUI* pCmdUI)
{
// TODO: Add your command update UI handler code here
pCmdUI->Enable (m_FigArray.GetSize ());
}
// implementation of figure classes:
IMPLEMENT_SERIAL (CFigure, CObject, 3)
CRect CFigure::GetDimRect ()
{
return CRect
(min (m_X1, m_X2),
min (m_Y1, m_Y2),
max (m_X1, m_X2) + 1,
max (m_Y1, m_Y2) + 1);
}
void CFigure::Serialize (CArchive& ar)
{
if (ar.IsStoring ())
ar << m_X1 << m_Y1 << m_X2 << m_Y2 <> m_X1 >> m_Y1 >> m_X2 >> m_Y2 >> m_Color;
}
IMPLEMENT_SERIAL (CLine, CFigure, 3)
CLine::CLine (int X1, int Y1, int X2, int Y2, COLORREF Color, int Thickness)
{
m_X1 = X1;
m_Y1 = Y1;
m_X2 = X2;
m_Y2 = Y2;
m_Color = Color;
m_Thickness = Thickness;
}
void CLine::Serialize (CArchive& ar)
{
CFigure::Serialize (ar);
if (ar.IsStoring ())
ar <> m_Thickness;
}
void CLine::Draw (CDC *PDC)
{
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_SOLID, m_Thickness, m_Color);
POldPen = PDC->SelectObject (&Pen);
// draw figure:
PDC->MoveTo (m_X1, m_Y1);
PDC->LineTo (m_X2, m_Y2);
// remove pen/brush:
PDC->SelectObject (POldPen);
}
IMPLEMENT_SERIAL (CRectangle, CFigure, 3)
CRectangle::CRectangle (int X1, int Y1, int X2, int Y2,
COLORREF Color, int Thickness)
{
m_X1 = X1;
m_Y1 = Y1;
m_X2 = X2;
m_Y2 = Y2;
m_Color = Color;
m_Thickness = Thickness;
}
void CRectangle::Serialize (CArchive& ar)
{
CFigure::Serialize (ar);
if (ar.IsStoring ())
ar <> m_Thickness;
}
void CRectangle::Draw (CDC *PDC)
{
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, m_Thickness, m_Color);
POldPen = PDC->SelectObject (&Pen);
PDC->SelectStockObject (NULL_BRUSH);
// draw figure:
PDC->Rectangle (m_X1, m_Y1, m_X2, m_Y2);
// remove pen/brush:
PDC->SelectObject (POldPen);
}
IMPLEMENT_SERIAL (CRectFill, CFigure, 3)
CRectFill::CRectFill (int X1, int Y1, int X2, int Y2, COLORREF Color)
{
m_X1 = min (X1, X2);
m_Y1 = min (Y1, Y2);
m_X2 = max (X1, X2);
m_Y2 = max (Y1, Y2);
m_Color = Color;
}
void CRectFill::Draw (CDC *PDC)
{
CBrush Brush, *POldBrush;
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, 1, m_Color);
POldPen = PDC->SelectObject (&Pen);
Brush.CreateSolidBrush (m_Color);
POldBrush = PDC->SelectObject (&Brush);
// draw figure:
PDC->Rectangle (m_X1, m_Y1, m_X2, m_Y2);
// remove pen/brush:
PDC->SelectObject (POldPen);
PDC->SelectObject (POldBrush);
}
IMPLEMENT_SERIAL (CRectRound, CFigure, 3)
CRectRound::CRectRound (int X1, int Y1, int X2, int Y2,
COLORREF Color, int Thickness)
{
m_X1 = min (X1, X2);
m_Y1 = min (Y1, Y2);
m_X2 = max (X1, X2);
m_Y2 = max (Y1, Y2);
m_Color = Color;
m_Thickness = Thickness;
}
void CRectRound::Serialize (CArchive& ar)
{
CFigure::Serialize (ar);
if (ar.IsStoring ())
ar <> m_Thickness;
}
void CRectRound::Draw (CDC *PDC)
{
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, m_Thickness, m_Color);
POldPen = PDC->SelectObject (&Pen);
PDC->SelectStockObject (NULL_BRUSH);
// draw figure:
int SizeRound = (m_X2 - m_X1 + m_Y2 - m_Y1) / 6;
PDC->RoundRect (m_X1, m_Y1, m_X2, m_Y2, SizeRound, SizeRound);
// remove pen/brush:
PDC->SelectObject (POldPen);
}
IMPLEMENT_SERIAL (CRectRoundFill, CFigure, 3)
CRectRoundFill::CRectRoundFill (int X1, int Y1, int X2, int Y2, COLORREF Color)
{
m_X1 = min (X1, X2);
m_Y1 = min (Y1, Y2);
m_X2 = max (X1, X2);
m_Y2 = max (Y1, Y2);
m_Color = Color;
}
void CRectRoundFill::Draw (CDC *PDC)
{
CBrush Brush, *POldBrush;
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, 1, m_Color);
POldPen = PDC->SelectObject (&Pen);
Brush.CreateSolidBrush (m_Color);
POldBrush = PDC->SelectObject (&Brush);
// draw figure:
int SizeRound = (m_X2 - m_X1 + m_Y2 - m_Y1) / 6;
PDC->RoundRect (m_X1, m_Y1, m_X2, m_Y2, SizeRound, SizeRound);
// remove pen/brush:
PDC->SelectObject (POldPen);
PDC->SelectObject (POldBrush);
}
IMPLEMENT_SERIAL (CCircle, CFigure, 3)
CCircle::CCircle (int X1, int Y1, int X2, int Y2,
COLORREF Color, int Thickness)
{
m_X1 = min (X1, X2);
m_Y1 = min (Y1, Y2);
m_X2 = max (X1, X2);
m_Y2 = max (Y1, Y2);
m_Color = Color;
m_Thickness = Thickness;
}
void CCircle::Serialize (CArchive& ar)
{
CFigure::Serialize (ar);
if (ar.IsStoring ())
ar <> m_Thickness;
}
void CCircle::Draw (CDC *PDC)
{
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, m_Thickness, m_Color);
POldPen = PDC->SelectObject (&Pen);
PDC->SelectStockObject (NULL_BRUSH);
// draw figure:
PDC->Ellipse (m_X1, m_Y1, m_X2, m_Y2);
// remove pen/brush:
PDC->SelectObject (POldPen);
}
IMPLEMENT_SERIAL (CCircleFill, CFigure, 3)
CCircleFill::CCircleFill (int X1, int Y1, int X2, int Y2, COLORREF Color)
{
m_X1 = min (X1, X2);
m_Y1 = min (Y1, Y2);
m_X2 = max (X1, X2);
m_Y2 = max (Y1, Y2);
m_Color = Color;
}
void CCircleFill::Draw (CDC *PDC)
{
CBrush Brush, *POldBrush;
CPen Pen, *POldPen;
// select pen/brush:
Pen.CreatePen (PS_INSIDEFRAME, 1, m_Color);
POldPen = PDC->SelectObject (&Pen);
Brush.CreateSolidBrush (m_Color);
POldBrush = PDC->SelectObject (&Brush);
// draw figure:
PDC->Ellipse (m_X1, m_Y1, m_X2, m_Y2);
// remove pen/brush:
PDC->SelectObject (POldPen);
PDC->SelectObject (POldBrush);
}
本文介绍了一次实验，目标是基于C++和QT创建一个具有图形界面和逻辑运算符功能的计算器。实验内容包括增加&&、||、!逻辑运算符，实现异常处理和图形交互。在QT界面设计中，通过学习和查找资源，成功将按钮与功能关联，实现了计算器的交互。测试结果显示，虽然存在一些逻辑运算处理上的限制，但整体上完成了预期的功能。
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