两跨连续梁影响线绘制(一)

题目大意：

如图所示，用户输入跨度L1和L2，绘制出B点的影响线。

效果：

步骤：

一、计算影响线

二、添加计算类：CCalculation

CCalculation.h

#pragma once
//计算影响线的公式
class CCalculation
{
public:CCalculation(void);CCalculation(const double l1,const double l2);CCalculation(const double l1,const double l2,const double l3);virtual ~CCalculation(void);
public:void Initlize(void);double GetInfluenceY(const double x) const;double GetEffectCoeffient() const;double GetSpanL1() const;double GetSpanL2() const;double GetSpanL3() const;double GetLength() const;
private:double m_dL1;double m_dL2;double m_dL3;};

CCalculation.cpp

#include "stdafx.h"
#include "CCalculation.h"
#include <math.h>CCalculation::CCalculation(void)
{
}CCalculation::CCalculation(const double l1,const double l2):m_dL1(l1),m_dL2(l2)
{}CCalculation::CCalculation(const double l1,const double l2,const double l3):m_dL1(l1),m_dL2(l2),m_dL3(l3)
{}CCalculation::~CCalculation(void)
{
}void CCalculation::Initlize(void)
{m_dL1 = 50;m_dL2 = 50;m_dL3 = 15;
}double CCalculation::GetInfluenceY(const double x) const
{double dL1=GetSpanL1();double dL2=GetSpanL2();double dL=GetLength();assert(x>=0);if (x>=0 && x<=dL1){return x*(dL1-x)*(dL1+x)/(dL1*(dL1+dL2));}else{return (x-dL1)*(dL2-(x-dL1))*(2*dL2-(x-dL1))/(dL2*(dL1+dL2));}
}double CCalculation::GetEffectCoeffient() const
{return m_dL1+m_dL2+m_dL3;
}double CCalculation::GetSpanL1() const
{return m_dL1;
}double CCalculation::GetSpanL2() const
{return m_dL2;
}double CCalculation::GetSpanL3() const
{return m_dL3;
}double CCalculation::GetLength() const
{return m_dL1+m_dL2;
}

三、添加绘制影响线的类：CDrawLine

CDrawLine.h

#pragma once
#include <afxwin.h>
class CDrawLine:public CWnd
{
public:CDrawLine(void);virtual ~CDrawLine(void);
public:void DrawInfulenceLine(CWnd *pWnd,double dLength1,double dLength2) const;};

CDrawLine.cpp

#include "stdafx.h"
#include "CDrawLine.h"#include "resource.h"
#include "CCalculation.h"
#include "InfluenceLineDlg.h"CDrawLine::CDrawLine(void)
{}CDrawLine::~CDrawLine(void)
{
}void CDrawLine::DrawInfulenceLine(CWnd *pWnd,double dLength1,double dLength2) const
{CRect rect;pWnd->GetClientRect(&rect);CDC *pDC = pWnd->GetDC();pWnd->Invalidate();pWnd->UpdateWindow();CPen newPen;       CPen *pOldPen;    CBrush newBrush;   CBrush *pOldBrush; newBrush.CreateSolidBrush(RGB(255,255,255));   pOldBrush = pDC->SelectObject(&newBrush);   pDC->Rectangle(rect);   pDC->SelectObject(pOldBrush);   newBrush.DeleteObject();   newPen.CreatePen(PS_SOLID, 2, RGB(0,0,0));   pOldPen = pDC->SelectObject(&newPen);   CCalculation Cal(dLength1,dLength2);double dL = Cal.GetLength();double dL1 = Cal.GetSpanL1();double dL2 = Cal.GetSpanL2();int nWidth = rect.Width();int nHeight = rect.Height();pDC->MoveTo(nWidth/10,nHeight/2);pDC->LineTo(9*nWidth/10,nHeight/2);CPoint Pt1[4];Pt1[0] = CPoint(nWidth/10, nHeight/2);Pt1[1] = CPoint(nWidth/10-12, nHeight/2+20);Pt1[2] = CPoint(nWidth/10+12,  nHeight/2+20);Pt1[3] = CPoint(nWidth/10, nHeight/2);pDC->Polyline(Pt1, 4);CPoint Pt2[4];Pt2[0] = CPoint(nWidth/10+(int)(dL1*(8*nWidth/10)/dL), nHeight/2);Pt2[1] = CPoint(int(nWidth/10+dL1*(8*nWidth/10)/dL-12), nHeight/2+20);Pt2[2] = CPoint(int(nWidth/10+dL1*(8*nWidth/10)/dL+12),  nHeight/2+20);Pt2[3] = CPoint(nWidth/10+(int)(dL1*(8*nWidth/10)/dL), nHeight/2);pDC->Polyline(Pt2, 4);CPoint Pt3[4];Pt3[0] = CPoint(9*nWidth/10, nHeight/2);Pt3[1] = CPoint(9*nWidth/10-12, nHeight/2+20);Pt3[2] = CPoint(9*nWidth/10+12,  nHeight/2+20);Pt3[3] = CPoint(9*nWidth/10, nHeight/2);pDC->Polyline(Pt3, 4);pDC->TextOut(nWidth/10,nHeight/2+25,_T("A"));pDC->TextOut(nWidth/10+(int)(dL1*(8*nWidth/10)/dL),nHeight/2+25,_T("B"));pDC->TextOut(9*nWidth/10,nHeight/2+25,_T("C"));pDC->TextOut(nWidth/10+(int)(dL1/2*(8*nWidth/10)/dL),nHeight/2-25,_T("L1"));pDC->TextOut(nWidth/10+((int)dL1+(int)dL2/2)*(8*nWidth/10)/(int)dL,nHeight/2-25,_T("L2"));//绘制影响线int nX=0;int nY=0;pDC->MoveTo(nWidth/10,nHeight/2);for (int i = 0;i <=(int)dL; i++){nX=nWidth/10+(i*8*nWidth/10)/(int)dL;nY=nHeight/2 + (int)(Cal.GetInfluenceY(i))*2;   pDC->LineTo(nX,nY);}//输出最大弯矩影响系数int nMaxY1=(int)(Cal.GetInfluenceY(dLength1/2));    int nMaxY2=(int)(Cal.GetInfluenceY(dLength1+dLength2/2));CString strY1=_T("");CString strY2=_T("");strY1.Format(_T("%d"),nMaxY1);strY2.Format(_T("%d"),nMaxY2);pDC->TextOut(nWidth/10+(int)(dL1/2*(8*nWidth/10)/dL),nHeight/2 +nMaxY1*2+7,strY1);pDC->TextOut(nWidth/10+(int)(dL1+dL2/2)*(8*nWidth/10)/(int)dL-10,nHeight/2 +nMaxY2*2+7,strY2);pDC->SelectObject(pOldPen);   newPen.DeleteObject();
}

四、对话框类：InfluenceLineDlg

InfluenceLineDlg.h


// InfluenceLineDlg.h : 头文件
//#pragma once
#include "afxwin.h"// CInfluenceLineDlg 对话框
class CInfluenceLineDlg : public CDialogEx
{
// 构造
public:CInfluenceLineDlg(CWnd* pParent = NULL);    // 标准构造函数// 对话框数据enum { IDD = IDD_INFLUENCELINE_DIALOG };protected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持// 实现
protected:HICON m_hIcon;// 生成的消息映射函数virtual BOOL OnInitDialog();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();DECLARE_MESSAGE_MAP()
public:afx_msg void OnBnClickedButtonInfluenceline();double m_dLength1;double m_dLength2;CStatic m_picDraw;double m_dLength3;double m_dEffCoeff;afx_msg void OnBnClickedButtonEffectCoeffient();
};

InfluenceLineDlg.cpp


// InfluenceLineDlg.cpp : 实现文件
//#include "stdafx.h"
#include "InfluenceLine.h"
#include "InfluenceLineDlg.h"
#include "afxdialogex.h"
#include "CCalculation.h"
#include "CDrawLine.h"#ifdef _DEBUG
#define new DEBUG_NEW
#endif// 用于应用程序“关于”菜单项的 CAboutDlg 对话框class CAboutDlg : public CDialogEx
{
public:CAboutDlg();// 对话框数据enum { IDD = IDD_ABOUTBOX };protected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持// 实现
protected:DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{CDialogEx::DoDataExchange(pDX);
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()// CInfluenceLineDlg 对话框CInfluenceLineDlg::CInfluenceLineDlg(CWnd* pParent /*=NULL*/): CDialogEx(CInfluenceLineDlg::IDD, pParent), m_dLength3(0), m_dEffCoeff(0)
{m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);CCalculation calInit;calInit.Initlize();m_dLength1 = calInit.GetSpanL1();m_dLength2 = calInit.GetSpanL2();m_dLength3 = calInit.GetSpanL3();m_dEffCoeff = calInit.GetEffectCoeffient();
}void CInfluenceLineDlg::DoDataExchange(CDataExchange* pDX)
{CDialogEx::DoDataExchange(pDX);DDX_Text(pDX, IDC_EDIT1, m_dLength1);DDX_Text(pDX, IDC_EDIT2, m_dLength2);DDX_Control(pDX, IDC_INFLUENCELINE_DRAW, m_picDraw);DDX_Text(pDX, IDC_EDIT4, m_dLength3);DDX_Text(pDX, IDC_EDIT_COEFFICIENT, m_dEffCoeff);
}BEGIN_MESSAGE_MAP(CInfluenceLineDlg, CDialogEx)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON_INFLUENCELINE, &CInfluenceLineDlg::OnBnClickedButtonInfluenceline)ON_BN_CLICKED(IDC_BUTTON_EFFECT_COEFFIENT, &CInfluenceLineDlg::OnBnClickedButtonEffectCoeffient)
END_MESSAGE_MAP()// CInfluenceLineDlg 消息处理程序BOOL CInfluenceLineDlg::OnInitDialog()
{CDialogEx::OnInitDialog();// 将“关于...”菜单项添加到系统菜单中。// IDM_ABOUTBOX 必须在系统命令范围内。ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL){BOOL bNameValid;CString strAboutMenu;bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);ASSERT(bNameValid);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动//  执行此操作SetIcon(m_hIcon, TRUE);         // 设置大图标SetIcon(m_hIcon, FALSE);        // 设置小图标// TODO: 在此添加额外的初始化代码return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}void CInfluenceLineDlg::OnSysCommand(UINT nID, LPARAM lParam)
{if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialogEx::OnSysCommand(nID, lParam);}
}// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。void CInfluenceLineDlg::OnPaint()
{if (IsIconic()){CPaintDC dc(this); // 用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);// 使图标在工作区矩形中居中int cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// 绘制图标dc.DrawIcon(x, y, m_hIcon);}else{CDialogEx::OnPaint();//初始化影响线CWnd *pWnd = GetDlgItem(IDC_INFLUENCELINE_DRAW);CDrawLine Draw;Draw.DrawInfulenceLine(pWnd,m_dLength1,m_dLength2);}
}//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CInfluenceLineDlg::OnQueryDragIcon()
{return static_cast<HCURSOR>(m_hIcon);
}void CInfluenceLineDlg::OnBnClickedButtonInfluenceline()
{// TODO: 在此添加控件通知处理程序代码UpdateData(TRUE);if (m_dLength1<30 || m_dLength1>160 || m_dLength2<30 || m_dLength2>160){AfxMessageBox(_T("连续梁适用跨度为30~160m!"));return;}//绘制影响线CWnd *pWnd = GetDlgItem(IDC_INFLUENCELINE_DRAW);CDrawLine Draw;Draw.DrawInfulenceLine(pWnd,m_dLength1,m_dLength2);
}void CInfluenceLineDlg::OnBnClickedButtonEffectCoeffient()
{// TODO: 在此添加控件通知处理程序代码UpdateData(TRUE);CCalculation calEfCo(m_dLength1,m_dLength2,m_dLength3);m_dEffCoeff = calEfCo.GetEffectCoeffient();UpdateData(FALSE);
}

项目完整代码：

链接：https://pan.baidu.com/s/1Gc7eSYktCzVOZrSaqGb9Ew
提取码：sa5x

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