MFC画图

MFC画图

#include "stdafx.h"
#include "huaquxian.h"
#include "huaquxianDlg.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()


// ChuaquxianDlg 对话框



ChuaquxianDlg::ChuaquxianDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(IDD_HUAQUXIAN_DIALOG, pParent)
	, m_coeff1(_T(""))
	, m_coeff2(_T(""))
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void ChuaquxianDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EDIT1, m_coeff1);
	DDX_Text(pDX, IDC_EDIT2, m_coeff2);
}

BEGIN_MESSAGE_MAP(ChuaquxianDlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, &ChuaquxianDlg::OnBnClickedButton1)
	ON_BN_CLICKED(IDC_BUTTON2, &ChuaquxianDlg::OnBnClickedButton2)
END_MESSAGE_MAP()


// ChuaquxianDlg 消息处理程序

BOOL ChuaquxianDlg::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 ChuaquxianDlg::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 ChuaquxianDlg::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();
	}
	CDC *pDC = GetDC();
	CPen pen1, pen2;
	pen1.CreatePen(PS_SOLID, 2, RGB(0, 255, 0));
	pen2.CreatePen(PS_SOLID, 2, RGB(100, 160, 240));
	pDC->SelectObject(&pen1);
	CRect rc;
	rc.SetRect(30, 80, 440, 380);
	pDC->Rectangle(rc);
	pen1.DeleteObject();

	pDC->SelectObject(&pen2);
	pDC->MoveTo(110, 230);
	pDC->LineTo(380, 230);
	pDC->LineTo(365, 220);
	pDC->MoveTo(380, 230);
	pDC->LineTo(365, 240);
	for (int i = -5; i <= 5; i++)
	{
		pDC->MoveTo(25 * i + 235, 225);
		pDC->LineTo(25 * i + 235, 235);
		CString Str;
		Str.Format(_T("%d"), i);
		if ((i != 0)&(i != 1) &(i != -1))
		{
			pDC->TextOut(25 * i + 230, 235, Str);
		}
	}

	pDC->MoveTo(235, 355);
	pDC->LineTo(235, 85);
	pDC->LineTo(225, 100);
	pDC->MoveTo(235, 85);
	pDC->LineTo(245, 100);
	for (int j = -5; j <= 5; j++)
	{
		pDC->MoveTo(230, 230 + 25 * j);
		pDC->LineTo(240, 230 + 25 * j);
		CString Str;
		Str.Format(_T("%d"), 0 - j);
		if ((j != 0) & (j != 1) & (j != -1))
		{
			pDC->TextOut(210, 220 + 25 * j, Str);
		}
	}
	pen2.DeleteObject();
	ReleaseDC(pDC);
}

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



void ChuaquxianDlg::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码
	UpdateData(TRUE);
	CString str1, str2;
	str1 = m_coeff1;
	str2 = m_coeff2;
	double a, b;
	a = atof(str1);
	b = atof(str2);
	CPoint point1, point2,point3;
	point1.x = 160;
	point1.y = 230 + 3 * a * 25 - 25 * b;
	point2.x = 310;
	point2.y = 230 - 3 * a * 25 - 25 * b;


	point3.x = 235 + 25 * a;
	point3.y = 230 - 25 * b;

	CDC *pDC = GetDC();
	CPen pen;
	pen.CreatePen(PS_SOLID, 2, RGB(0, 0, 200));
	pDC->SelectObject(&pen);
	pDC->MoveTo(point1.x, point1.y);
	pDC->LineTo(point2.x, point2.y);
	
	int offset = 5;

	pDC->MoveTo(point3.x - offset, point3.y - offset);
	pDC->LineTo(point3.x + offset, point3.y + offset);

	pDC->MoveTo(point3.x - offset, point3.y - offset);
	pDC->LineTo(point3.x + offset, point3.y + offset);

	pDC->MoveTo(point3.x - offset, point3.y + offset);
	pDC->LineTo(point3.x + offset, point3.y - offset);

	pDC->MoveTo(point3.x - offset, point3.y);
	pDC->LineTo(point3.x + offset, point3.y);

	pDC->MoveTo(point3.x, point3.y- offset);
	pDC->LineTo(point3.x, point3.y+ offset);
	//pDC->LineTo(point3.x, point3.y);
	bool flag = pDC->SetPixelV(point3, RGB(255, 255, 0));
	pen.DeleteObject();
	ReleaseDC(pDC);
	UpdateData(FALSE);
}


void ChuaquxianDlg::OnBnClickedButton2()
{
	// TODO: 在此添加控件通知处理程序代码
	// 清空绘制区域
	CRect rectDlg;
	GetClientRect(rectDlg);			// 获得窗体的大小
	int pointWidth = rectDlg.Width();		// 获取窗体宽度
	int pointHeight = rectDlg.Height();		// 获取窗体高度
	RedrawWindow(CRect(0, 0, pointWidth, pointHeight));		// 重绘指定区域

	UpdateData(TRUE);
	CString st1 = NULL, st2 = NULL;
	m_coeff1 = st1;
	m_coeff2 = st2;
	UpdateData(FALSE);
}