C++&QT实现计算器图形界面交互

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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一、实验目的和要求

要求:在实验-03、实验-05的作业内容基础上

(1)增加图形交互功能。

(2)增加3个逻辑运算符 &&、||、 !,并能处理逻辑运算符和算术运算符的混合运算。

(3)增加容错功能,能进行异常处理。

说明

(1)其中牵涉到数据结构相关的可复用代码,可自行选择。

(2)提交时间:3周至4周左右时长,具体时间节点另行通知。

(3)其它要求同实验-01 。

二、实验环境

编译器:Vscode & DevC++&QT creator个人推荐下载版本

系统:Windows10

CPU:i5-8265U@1.60GHz

三、实验内容

拥有图形界面的可操作计算器

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); }
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