1.程序界面

2.实现步骤

1.创建一个RulerBox类继承CWnd

RulerBox.h文件

#if !defined(AFX_RULERBOX_H__603E9AFC_6C42_4D69_8EF5_6791BA4133F4__INCLUDED_)<br /> #define AFX_RULERBOX_H__603E9AFC_6C42_4D69_8EF5_6791BA4133F4__INCLUDED_</p> <p>#if _MSC_VER > 1000<br /> #pragma once<br /> #endif // _MSC_VER > 1000<br /> // RulerBox.h : header file<br /> //</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // RulerBox window</p> <p>class RulerBox : public CWnd<br /> {<br /> // Construction<br /> public:<br /> RulerBox();</p> <p>// Attributes<br /> public:</p> <p>// Operations<br /> public:</p> <p>// Overrides<br /> // ClassWizard generated virtual function overrides<br /> //{{AFX_VIRTUAL(RulerBox)<br /> public:<br /> virtual BOOL Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext = NULL);<br /> //}}AFX_VIRTUAL</p> <p>// Implementation<br /> public:<br /> void Create(CWnd* pParentWnd,DWORD dwStyle,int type,int x,int y,int length);<br /> void SetPixPerM();<br /> void DrawBackGround(CDC* pDC);<br /> void SetBackGroundColor(COLORREF color);<br /> virtual ~RulerBox();</p> <p> // Generated message map functions<br /> protected:<br /> //{{AFX_MSG(RulerBox)<br /> afx_msg void OnPaint();<br /> //}}AFX_MSG<br /> DECLARE_MESSAGE_MAP()<br /> public:<br /> void DrawHorizontalRuler(CDC* pDC);<br /> void DrawVerticalRuler(CDC* pDC);<br /> public:<br /> CRect rect;//标尺区域<br /> int width;//标尺宽度，单位为像素<br /> int height;//标尺高度，单位为像素<br /> private:<br /> COLORREF backColor;//背景色<br /> int rulerType;//标尺类型，0为水平标尺，1为垂直标尺</p> <p> int nhPixPerM;//获得水平方向上每厘米多少个像素<br /> int nvPixPerM;//获得垂直方向上每厘米多少个像素</p> <p> int longRuler;//尺子长度，单位为厘米<br /> int widthRuler;//尺子的宽度，单位为厘米</p> <p> double longPreCM;//厘米刻度线的长度，单位为厘米<br /> double longPreMM;//毫米刻度线的长度，单位为厘米<br /> };</p> <p>/////////////////////////////////////////////////////////////////////////////</p> <p>//{{AFX_INSERT_LOCATION}}<br /> // Microsoft Visual C++ will insert additional declarations immediately before the previous line.</p> <p>#endif // !defined(AFX_RULERBOX_H__603E9AFC_6C42_4D69_8EF5_6791BA4133F4__INCLUDED_)<br />

RulerBox.cpp文件

// RulerBox.cpp : implementation file<br /> //</p> <p>#include "stdafx.h"<br /> #include "Ruler.h"<br /> #include "RulerBox.h"</p> <p>#ifdef _DEBUG<br /> #define new DEBUG_NEW<br /> #undef THIS_FILE<br /> static char THIS_FILE[] = __FILE__;<br /> #endif</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // RulerBox</p> <p>RulerBox::RulerBox()<br /> {<br /> backColor = RGB(233,235,234);//初始化背景色<br /> SetPixPerM();//初始化每厘米像素值<br /> widthRuler=2;//尺子宽度为2厘米<br /> longPreCM=0.5;//厘米刻度线长度为0.5厘米<br /> longPreMM=0.25;//毫米刻度线的长度为0.25厘米<br /> }</p> <p>RulerBox::~RulerBox()<br /> {<br /> }</p> <p>BEGIN_MESSAGE_MAP(RulerBox, CWnd)<br /> //{{AFX_MSG_MAP(RulerBox)<br /> ON_WM_PAINT()<br /> //}}AFX_MSG_MAP<br /> END_MESSAGE_MAP()</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // RulerBox message handlers</p> <p>void RulerBox::OnPaint()<br /> {<br /> CPaintDC dc(this);<br /> dc.SetBkMode(TRANSPARENT);//设置背景透明<br /> //DrawBackGround(&dc);//绘制背景</p> <p> if(rulerType==1)//垂直标尺<br /> {<br /> DrawVerticalRuler(&dc);<br /> }<br /> else if(rulerType==0)//水平标尺<br /> {<br /> DrawHorizontalRuler(&dc);<br /> }<br /> }</p> <p>//设置背景色<br /> void RulerBox::SetBackGroundColor(COLORREF color)<br /> {<br /> backColor = color;<br /> }</p> <p>//画背景<br /> void RulerBox::DrawBackGround(CDC *pDC)<br /> {<br /> CBrush br(backColor);//创建画刷<br /> CRect rect;<br /> GetClientRect(&rect);//获得客户区域<br /> pDC->FillRect(&rect,&br);//填充客户区域<br /> }</p> <p>//设置每厘米的像素值<br /> void RulerBox::SetPixPerM()<br /> {<br /> HDC hdcScreen=CreateDC("DISPLAY",NULL,NULL,NULL);//创建一个屏幕设备<br /> int nHpix=GetDeviceCaps(hdcScreen,HORZRES);//获取屏幕水平像素值<br /> int nVpix=GetDeviceCaps(hdcScreen,VERTRES);//获取屏幕垂直像素值<br /> int nhMM=GetDeviceCaps(hdcScreen,HORZSIZE);//获取屏幕宽度，单位为毫米<br /> int nvMM=GetDeviceCaps(hdcScreen,VERTSIZE);//获取屏幕高度，单位为毫米<br /> nhPixPerM=nHpix/nhMM*10;//获取水平方向每厘米的像素值<br /> nvPixPerM=nVpix/nvMM*10;//获取垂直方向每厘米的像素值<br /> }</p> <p>BOOL RulerBox::Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)<br /> {<br /> // TODO: Add your specialized code here and/or call the base class</p> <p> return CWnd::Create(lpszClassName, lpszWindowName, dwStyle, rect, pParentWnd, nID, pContext);<br /> }</p> <p>//该方法用来创建标尺，type为尺子类型，0为水平直尺，1为垂直直尺，x,y为直尺坐标，longRuler为尺子长度单位为厘米<br /> void RulerBox::Create(CWnd *pParentWnd, DWORD dwStyle,int type,int x,int y,int length)<br /> {<br /> this->longRuler = length+1;//尺子长度<br /> rulerType = type;//标尺类型</p> <p> if(type==0)//水平标尺<br /> {<br /> rect.left=x;//标尺横坐标<br /> rect.top=y;//标尺纵坐标<br /> rect.right=x+longRuler*nhPixPerM;<br /> rect.bottom=y+widthRuler*nvPixPerM;<br /> width = longRuler*nhPixPerM;//标尺宽度，单位为像素<br /> height = widthRuler*nvPixPerM;//标尺高度，单位为像素<br /> }<br /> else if(type==1)//垂直标尺<br /> {<br /> rect.left=x;//标尺横坐标<br /> rect.top=y;//标尺纵坐标<br /> rect.right=x+widthRuler*nhPixPerM;<br /> rect.bottom=y+longRuler*nvPixPerM;<br /> width = widthRuler*nhPixPerM;//标尺宽度，单位为像素<br /> height = longRuler*nvPixPerM;//标尺高度，单位为像素<br /> }</p> <p> this->Create(NULL,NULL,dwStyle,rect,pParentWnd,NULL);<br /> }</p> <p>//画图垂直标尺<br /> void RulerBox::DrawVerticalRuler(CDC *pDC)<br /> {<br /> //画标尺长度<br /> pDC->MoveTo(nhPixPerM+0.99*nhPixPerM,0.5*nhPixPerM);<br /> pDC->LineTo(nhPixPerM+0.99*nhPixPerM,nvPixPerM*(longRuler-1)+0.5*nhPixPerM);</p> <p> //画厘米刻度线<br /> for(int i=0;i<longRuler;i++)<br /> {<br /> pDC->MoveTo(nhPixPerM+0.99*nhPixPerM,i*nvPixPerM+0.5*nhPixPerM);<br /> pDC->LineTo(nhPixPerM-longPreCM*nhPixPerM+0.99*nhPixPerM,i*nvPixPerM+0.5*nhPixPerM);</p> <p> //画刻度标记<br /> CString text;<br /> text.Format("%d",i);</p> <p> CRect rect(nhPixPerM-0.9*nhPixPerM+0.99*nhPixPerM,i*nvPixPerM+0.5*nhPixPerM-7,nhPixPerM-0.9*nhPixPerM+15+0.99*nhPixPerM,i*nvPixPerM+0.5*nhPixPerM+13);<br /> pDC->SetBkMode(TRANSPARENT);//设置背景透明<br /> pDC->DrawText(text,&rect,DT_LEFT|DT_WORDBREAK);<br /> }</p> <p> //画毫米刻度线<br /> for(int j=0;j<longRuler*10-9;j++)<br /> {<br /> pDC->MoveTo(nhPixPerM+0.99*nhPixPerM,j*nvPixPerM/10+0.5*nhPixPerM);<br /> pDC->LineTo(nhPixPerM-longPreMM*nhPixPerM+0.99*nhPixPerM,j*nvPixPerM/10+0.5*nhPixPerM);<br /> }<br /> }</p> <p>//画水平标尺<br /> void RulerBox::DrawHorizontalRuler(CDC *pDC)<br /> {<br /> //画标尺长度<br /> pDC->MoveTo(0.5*nvPixPerM,nvPixPerM+0.99*nvPixPerM);<br /> pDC->LineTo(nhPixPerM*(longRuler-1)+0.5*nvPixPerM,nvPixPerM+0.99*nvPixPerM);</p> <p> //画厘米刻度线<br /> for(int i=0;i<longRuler;i++)<br /> {<br /> pDC->MoveTo(i*nhPixPerM+0.5*nvPixPerM,nvPixPerM+0.99*nvPixPerM);<br /> pDC->LineTo(i*nhPixPerM+0.5*nvPixPerM,nvPixPerM-longPreCM*nvPixPerM+0.99*nvPixPerM);</p> <p> //画刻度标记<br /> CString text;<br /> text.Format("%d",i);</p> <p> CRect rect(i*nhPixPerM+0.42*nvPixPerM,nvPixPerM-longPreCM*nvPixPerM-15+0.99*nvPixPerM,i*nhPixPerM+0.42*nvPixPerM+15,nvPixPerM-longPreCM*nvPixPerM+0.99*nvPixPerM);<br /> pDC->SetBkMode(TRANSPARENT);//设置背景透明<br /> pDC->DrawText(text,&rect,DT_LEFT|DT_WORDBREAK);<br /> }</p> <p> //画毫米刻度线<br /> for(int j=0;j<longRuler*10-9;j++)<br /> {<br /> pDC->MoveTo(j*nhPixPerM/10+0.5*nvPixPerM,nvPixPerM+0.99*nvPixPerM);<br /> pDC->LineTo(j*nhPixPerM/10+0.5*nvPixPerM,nvPixPerM-longPreMM*nvPixPerM+0.99*nvPixPerM);<br /> }<br /> }<br />   

2.使用RulerBox类

1.在RulerDlg中定义

private:<br /> RulerBox rulerBoxH;<br /> RulerBox rulerBoxV;

2.在RulerDlg的OnInitDialog()方法中创建标尺

rulerBoxV.Create(this,WS_CHILD|WS_VISIBLE,1,159,60,10);<br /> rulerBoxH.Create(this,WS_CHILD|WS_VISIBLE,0,220,0,10);