mfc动态显示数据-折线图

爱钓鱼的程序猿

已于 2023-12-27 21:41:28 修改

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文章标签： mfc c++

于 2023-12-27 21:36:48 首次发布

本文链接：https://blog.youkuaiyun.com/m0_69637774/article/details/135256435

版权

什么控件都不需要，建一个mfc关于dialog的工程就行，文中数据的使用随机数产生

// MFCPaintDlg.h : 头文件
//

#pragma once
#include <vector>
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;
// CMFCPaintDlg 对话框
class CMFCPaintDlg : public CDialogEx
{
// 构造
public:
CMFCPaintDlg(CWnd* pParent = NULL); // 标准构造函数

// 对话框数据
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_MFCPAINT_DIALOG };
#endif

protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持

   int left = 80, right = 1080, top = 20, bottom = 1020;
   void paintGrid(CPaintDC& dc);
   int currentTime = 0;
   CTime nowTime;
   vector<CTime> timeVec;

   int point[5] = { 1000,3000,2000,8000,1000 };
   vector<int> data;
// 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 OnTimer(UINT_PTR nIDEvent);

};

// MFCPaintDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "MFCPaint.h"
#include "MFCPaintDlg.h"
#include "afxdialogex.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
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_ABOUTBOX };
#endif

protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持

// 实现
protected:
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()

// CMFCPaintDlg 对话框

CMFCPaintDlg::CMFCPaintDlg(CWnd* pParent /*=NULL*/)
: CDialogEx(IDD_MFCPAINT_DIALOG, pParent)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMFCPaintDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CMFCPaintDlg, CDialogEx)
   ON_WM_SYSCOMMAND()
   ON_WM_PAINT()
   ON_WM_QUERYDRAGICON()
   ON_WM_TIMER()
END_MESSAGE_MAP()

// CMFCPaintDlg 消息处理程序

BOOL CMFCPaintDlg::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

ShowWindow(SW_NORMAL);

   // TODO: 在此添加额外的初始化代码
   CRect rect;
   GetWindowRect(&rect);
   rect.bottom = rect.top + 1200;
   rect.right = rect.left + 1200;
   MoveWindow(rect);

   // 获取屏幕的宽度和高度
   int screenWidth = GetSystemMetrics(SM_CXSCREEN);
   int screenHeight = GetSystemMetrics(SM_CYSCREEN);

SetWindowPos(this, (screenWidth - 1200) / 2, (screenHeight - 1200) / 2,1200,1200,100);

// 设置种子，以确保每次运行程序时生成不同的随机数序列
srand((int)time(NULL));

SetTimer(1,1000,NULL);
return TRUE; // 除非将焦点设置到控件，否则返回 TRUE
}

void CMFCPaintDlg::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 CMFCPaintDlg::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
   {
       CPaintDC dc(this); // 用于绘制的设备上下文
       paintGrid(dc);
       CDialogEx::OnPaint();
   }
}

//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 CMFCPaintDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}

void CMFCPaintDlg::paintGrid(CPaintDC& dc)
{
   dc.MoveTo(left, top);
   dc.LineTo(left, bottom);
   dc.LineTo(right, bottom);
   dc.LineTo(right, top);
   dc.LineTo(left, top);

   //这三句的作用是将画布清除及上面的点，而在下面重新进行网格绘制
   CRect rect;
   GetClientRect(&rect);
   dc.FillSolidRect(rect, RGB(255, 255, 255)); // 使用白色填充整个画布

int j = 0;

   // 显示网格
   CPen pen(PS_SOLID, 1, RGB(150, 150, 150)); //创建笔，虚线，并调整坐标颜色灰色
   CPen* pOldPen = (CPen*)dc.SelectObject(&pen);
   for (int x = left; x <= right; x += 100)
   {
       dc.MoveTo(x, top);
       dc.LineTo(x, bottom);
   }

   for (int i = 0; i < timeVec.size(); i++)
   {
       CString strTime;
       strTime = timeVec[timeVec.size() - i - 1].Format(_T("%H:%M:%S"));
       CSize textSize = dc.GetTextExtent(strTime); // 获取文本尺寸

       int textX = right - i * 100 - textSize.cx / 2;// 计算时间文本的位置
       int textY = bottom + 10;

dc.TextOut(textX, textY, strTime);
}

   for (int y = bottom; y >= top; y -= 100) {
       dc.MoveTo(left, y);
       dc.LineTo(right, y);

       CRect textRect(left - 200, y - 10, left - 3, y + 10);
       CString yInfo;
       yInfo.Format(_T("%.2f"), -32767 + 6553.4 * j);
       dc.DrawText(yInfo, &textRect, DT_SINGLELINE | DT_RIGHT);
       j += 1;
   }

   // 显示坐标轴X
   CPen pen2(PS_SOLID, 3, RGB(0, 0, 0));
   CPen* pOldPen2 = (CPen*)dc.SelectObject(&pen2);
   dc.MoveTo(left - 10,bottom / 2 + 10);
   dc.LineTo(right + 10, bottom / 2 + 10);
   dc.LineTo(right + 5, bottom / 2 + 5);
   dc.MoveTo(right + 10, bottom / 2 + 10);
   dc.LineTo(right + 5, bottom / 2 + 15);
   //Y
   dc.MoveTo(right / 2 + 40, bottom + 10);
   dc.LineTo(right / 2 + 40, top - 10);
   dc.LineTo(right / 2 + 35, top - 5);
   dc.MoveTo(right / 2 + 40, top - 10);
   dc.LineTo(right / 2 + 45, top - 5);

   CPen pen3(PS_DOT, 3, RGB(255, 0, 0)); // 创建红色的画笔
   CPen* pOldPen3 = dc.SelectObject(&pen3);
   for (int i = 0; i < data.size(); i++)
   {
       int pointX = right - (timeVec.size() - i - 1) * 100;// 计算数据点的位置
       int pointY = bottom - (int)(((data[i] + 32767) / 65535.0) * 1000); // 根据数据值计算Y坐标

dc.Ellipse(pointX - 3, pointY - 3, pointX + 3, pointY + 3);
dc.TextOut(pointX + 10, pointY - 10, static_cast<LPCWSTR>(CString(std::to_string(data[i]).c_str())));

       if (i > 0)
       {
           int startX = right - (timeVec.size() - i) * 100;
           int startY;
           if (data[i - 1] > 0)
               startY = bottom - (int)(((data[i - 1] + 32767) / 65535.0) * 1000);
           else
               startY = top - (int)((data[i - 1] - 32767) / 65535.0 * 1000);
           int endX = right - (timeVec.size() - i - 1) * 100;
           int endY;
           if (data[i] > 0)
               endY = bottom - (int)(((data[i] + 32767) / 65535.0) * 1000);
           else
               endY = top - (int)((data[i] - 32767) / 65535.0 * 1000);
           dc.MoveTo(startX, startY);
           dc.LineTo(endX, endY);
       }
   }
   dc.SelectObject(pOldPen3);
}

void CMFCPaintDlg::OnTimer(UINT_PTR nIDEvent)
{
   // TODO: 在此添加消息处理程序代码和/或调用默认值
   if (nIDEvent == 1)
   {
       // 更新currentTime的值
       currentTime += 1; // 假设每秒钟增加1

       nowTime = CTime::GetCurrentTime();

       timeVec.push_back(nowTime);

       // 生成随机数
       int randomNumber = std::rand();
       if(currentTime % 2 == 0)
           data.push_back(-randomNumber);
       else
           data.push_back(randomNumber);

       if (timeVec.size() == 12)
       {
           timeVec.erase(timeVec.begin());
           data.erase(data.begin());
       }
       InvalidateRect(NULL, FALSE);// 触发重绘
   }
   CDialogEx::OnTimer(nIDEvent);
}