2dcadview.cpp

Visual c++.程序设计培训教程

// 2DCADView.cpp : implementation of the CMy2DCADView class
//

#include "stdafx.h"
#include "2DCAD.h"

#include "2DCADDoc.h"
#include "2DCADView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView
//自定义消息
#define       WM_MY_MESSAGE            (WM_USER + 101)

IMPLEMENT_DYNCREATE(CMy2DCADView, CView)

BEGIN_MESSAGE_MAP(CMy2DCADView, CView)
	ON_WM_CONTEXTMENU()
	//{{AFX_MSG_MAP(CMy2DCADView)
	ON_COMMAND(ID_GRAPH_POINT, OnGraphPoint)
	ON_UPDATE_COMMAND_UI(ID_GRAPH_POINT, OnUpdateGraphPoint)
	ON_UPDATE_COMMAND_UI(ID_GRAPH_LINE, OnUpdateGraphLine)
	ON_WM_LBUTTONDOWN()
	ON_WM_SETCURSOR()
	ON_WM_KEYDOWN()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_MY_MESSAGE, OnMyMessage) //自定义消息
	ON_COMMAND(ID_GRAPH_LINE, OnGraphLine)
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView construction/destruction

CMy2DCADView::CMy2DCADView()
{
	// TODO: add construction code here
	m_bIsPoint = FALSE;
	m_bIsLine  = FALSE;

	m_nStep = 0;//操作步数初始为0
	m_nStartX = m_nStartY = 0;//坐标值初始也为0
	m_nEndX = m_nEndY = 0;
}

CMy2DCADView::~CMy2DCADView()
{
}

BOOL CMy2DCADView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView drawing

void CMy2DCADView::OnDraw(CDC* pDC)
{
	CMy2DCADDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView printing

BOOL CMy2DCADView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CMy2DCADView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CMy2DCADView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView diagnostics

#ifdef _DEBUG
void CMy2DCADView::AssertValid() const
{
	CView::AssertValid();
}

void CMy2DCADView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CMy2DCADDoc* CMy2DCADView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMy2DCADDoc)));
	return (CMy2DCADDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMy2DCADView message handlers

void CMy2DCADView::OnGraphPoint() 
{
	// TODO: Add your command handler code here
	CClientDC dc(this);
	//在视图区中输出文本“画点”
	dc.TextOut(100, 100, "画点");

	m_bIsPoint = TRUE;//允许画点
	m_bIsLine  = FALSE;

	SendMessage(WM_MY_MESSAGE);//发送自定义消息
}

void CMy2DCADView::OnUpdateGraphPoint(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetRadio(m_bIsPoint);//根据布尔变量的值控制用户界面更新
}

//手动添加的消息映射函数
void CMy2DCADView::OnGraphLine() 
{
	CClientDC dc(this);
	//在视图区中输出文本“画线”
	dc.TextOut(100, 100, "画线");

	m_bIsLine  = TRUE;//允许画线
	m_bIsPoint = FALSE;
}

void CMy2DCADView::OnUpdateGraphLine(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetRadio(m_bIsLine);//根据布尔变量的值控制用户界面更新
}

#include "resource.h"
void CMy2DCADView::OnContextMenu(CWnd*, CPoint point)
{

	// CG: This block was added by the Pop-up Menu component
	{
		if (point.x == -1 && point.y == -1){
			//keystroke invocation
			CRect rect;
			GetClientRect(rect);
			ClientToScreen(rect);

			point = rect.TopLeft();
			point.Offset(5, 5);
		}

		CMenu menu;//声明一个CMenu类的对象
		VERIFY(menu.LoadMenu(CG_IDR_POPUP_MY2_DCADVIEW));//从资源中装载菜单

		CMenu* pPopup = menu.GetSubMenu(0);//获取弹出菜单的子菜单
		ASSERT(pPopup != NULL);
		CWnd* pWndPopupOwner = this;

		//使用循环获取菜单的所属窗口
		while (pWndPopupOwner->GetStyle() & WS_CHILD)
			pWndPopupOwner = pWndPopupOwner->GetParent();

		//使用TrackPopupMenu函数弹出并跟踪菜单
		pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y,
			pWndPopupOwner);
	}
}

//自定义消息的处理函数
LRESULT CMy2DCADView::OnMyMessage(WPARAM wParam, LPARAM lParam)
{
	CClientDC dc(this);
	//在视图区中输出文本“测试自定义消息”
	dc.TextOut(100, 50, "测试自定义消息");

	return 1;
}

void CMy2DCADView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
/*	CClientDC dc(this);//获取设备环境
	//在视图区中输出文本“鼠标左键按下”
	dc.TextOut(100, 100, "鼠标左键按下");
	
	if( nFlags & MK_SHIFT )
	{//检查在按下鼠标左键的同时，Shift键是否被按下
		dc.TextOut(100, 50, "Shift键被按下");
	}
*/

	CClientDC dc(this);//获取设备环境
	//////////////////////////////////////////////////
	//          以下的代码在视图区中画点            //
	//////////////////////////////////////////////////
	if(m_bIsPoint)//如果程序处于画点状态
	{
		//调用CDC::Ellipse函数以点为中心，画一个小的圆圈
		dc.Ellipse(point.x-2, point.y-2, point.x+2, point.y+2);
	}

	//////////////////////////////////////////////////
	//          以下的代码在视图区中画线段          //
	//////////////////////////////////////////////////
	if(m_bIsLine)//如果程序处于画线状态
	{
		if(m_nStep == 0)//如果是线段起点，则记录起点坐标
		{
			m_nStartX = point.x;
			m_nStartY = point.y;

			m_nStep ++;//操作步数加1
			
			SetCapture();//捕捉鼠标
		}
		else//如果是线段终点，则在视图区中画出线段
		{
			dc.MoveTo(m_nStartX, m_nStartY);
			dc.LineTo(point.x, point.y);//使用MoveTo、LineTo函数画线

			m_nStep = 0;//完成一次画线段后，将操作步数归零
			m_nStartX = m_nStartY = 0;//将记录起点坐标归零
			m_nEndX = m_nEndY = 0;//将终点坐标归零

			::ReleaseCapture();//释放鼠标捕捉
		}
	}

	CView::OnLButtonDown(nFlags, point);
}


BOOL CMy2DCADView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bIsPoint)
	{//如果处于画点状态，就使用自定义的IDC_POINTER光标
		HCURSOR   hCursor;

		hCursor = AfxGetApp()->LoadCursor(IDC_POINTER);//装载自定义光标
		SetCursor(hCursor);							   //设置光标

		return TRUE;//直接返回，不再调用CView::OnSetCursor
	}

	if(m_bIsLine) 
	{//如果处于画线状态，就使用Windows系统的IDC_CROSS十字光标
		HCURSOR   hCursor;

		hCursor = AfxGetApp()->LoadStandardCursor(IDC_CROSS);//装载自定义光标
		SetCursor(hCursor);									 //设置光标

		return TRUE;
	} 
	
	//其它情况下，由基类的OnSetCursor函数来设置缺省光标形状
	return CView::OnSetCursor(pWnd, nHitTest, message);
}

void CMy2DCADView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	//如果按下Esc键，则终止所有的绘图工作
	if(nChar == VK_ESCAPE)
	{
		//清除掉画点和画线状态
		m_bIsPoint = FALSE;
		m_bIsLine  = FALSE;

		//将一些成员变量恢复初始值
		m_nStep = 0;//操作步数归零
		m_nStartX = m_nStartY = 0;//记录起点坐标归零

		::ReleaseCapture();//释放鼠标捕捉
	}

	//将消息交给基类的OnKeyDown函数处理
	CView::OnKeyDown(nChar, nRepCnt, nFlags);
}


void CMy2DCADView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CClientDC dc(this);//获取设备环境

	/////////////////////////////////////////////////
	//          在画线段过程中拉出橡皮线           //
	/////////////////////////////////////////////////
	if(m_bIsLine)
	{
		if(m_nStep != 0)//如果不是起始点，拉出橡皮条
		{
			dc.SetROP2(R2_NOTXORPEN);//设置线条模式
			if(m_nEndX !=0)
			{//如果不是第一次画线，则擦除上一条线
				dc.MoveTo(m_nStartX, m_nStartY);
				dc.LineTo(m_nEndX, m_nEndY);
			}

			//更新终点的坐标值
			m_nEndX = point.x;
			m_nEndY = point.y;
			//画出新的线段
			dc.MoveTo(m_nStartX, m_nStartY);
			dc.LineTo(m_nEndX, m_nEndY);
		}
	}
	
	//////////////////////////////////////////////////////////////////
	//            在状态栏的第二个窗格中输出鼠标当前位置            //
	//////////////////////////////////////////////////////////////////
	CString str;	//声明一个字符串
	CStatusBar* pStatus;

	pStatus = (CStatusBar*)AfxGetApp()->m_pMainWnd->
		GetDescendantWindow(AFX_IDW_STATUS_BAR);//获取状态栏窗口指针

	if (pStatus) //如果获取指针成功（不为空）
	{
		str.Format("x = %3d，y = %3d", point.x, point.y);//将坐标写入字符串
		pStatus->SetPaneText(1, str);//将字符串输出到第二个窗格
	}

	//调用基类的鼠标移动消息处理函数
	CView::OnMouseMove(nFlags, point);
}