hellman 发表于 2009-5-12 10:33:00

怎么让预览的图案变大

<p>实现dwg的文件块在窗体上预览</p><p>一，使用块浏览器对象blockthumbnailhelper来预览</p><p>二，使用插件DwgThumbnail来实现</p><p>三，是使用网上提供的下面的代码来实现</p><p>class ViewDWG<br/>&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct BITMAPFILEHEADER<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public short bfType;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public int bfSize;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public short bfReserved1;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public short bfReserved2;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public int bfOffBits;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public static Image GetDwgImage(string FileName)<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!(File.Exists(FileName)))<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new FileNotFoundException("文件没有被找到");<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FileStream DwgF;&nbsp; //文件流<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int PosSentinel;&nbsp; //文件描述块的位置<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BinaryReader br;&nbsp; //读取二进制文件<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int TypePreview;&nbsp; //缩略图格式<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int PosBMP;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //缩略图位置 <br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int LenBMP;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //缩略图大小<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; short biBitCount; //缩略图比特深度 <br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BITMAPFILEHEADER biH; //BMP文件头，DWG文件中不包含位图文件头，要自行加上去<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; byte[] BMPInfo;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //包含在DWG文件中的BMP文件体<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MemoryStream BMPF = new MemoryStream(); //保存位图的内存文件流<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BinaryWriter bmpr = new BinaryWriter(BMPF); //写二进制文件类<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Image myImg = null;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF = new FileStream(FileName, FileMode.Open, FileAccess.Read);&nbsp;&nbsp; //文件流<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; br = new BinaryReader(DwgF);<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF.Seek(13, SeekOrigin.Begin); //从第十三字节开始读取<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PosSentinel = br.ReadInt32();&nbsp; //第13到17字节指示缩略图描述块的位置<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF.Seek(PosSentinel + 30, SeekOrigin.Begin);&nbsp; //将指针移到缩略图描述块的第31字节<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TypePreview = br.ReadByte();&nbsp; //第31字节为缩略图格式信息，2 为BMP格式，3为WMF格式<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (TypePreview == 1)<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else if (TypePreview == 2 || TypePreview == 3)<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PosBMP = br.ReadInt32(); //DWG文件保存的位图所在位置<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LenBMP = br.ReadInt32(); //位图的大小<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF.Seek(PosBMP + 14, SeekOrigin.Begin); //移动指针到位图块<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biBitCount = br.ReadInt16(); //读取比特深度<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF.Seek(PosBMP, SeekOrigin.Begin); //从位图块开始处读取全部位图内容备用<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BMPInfo = br.ReadBytes(LenBMP); //不包含文件头的位图信息<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; br.Close();<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DwgF.Close();<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfType = 19778; //建立位图文件头<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (biBitCount &lt; 9)<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfSize = 54 + 4 * (int)(Math.Pow(2, biBitCount)) + LenBMP;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfSize = 54 + LenBMP;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfReserved1 = 0; //保留字节<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfReserved2 = 0; //保留字节<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; biH.bfOffBits = 14 + 40 + 1024; //图像数据偏移<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //以下开始写入位图文件头<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(biH.bfType); //文件类型<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(biH.bfSize);&nbsp; //文件大小<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(biH.bfReserved1); //0<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(biH.bfReserved2); //0<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(biH.bfOffBits); //图像数据偏移<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Write(BMPInfo); //写入位图<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BMPF.Seek(0, SeekOrigin.Begin); //指针移到文件开始处<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; myImg = Image.FromStream(BMPF); //创建位图文件对象<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bmpr.Close();<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BMPF.Close();<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return myImg;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; catch (Exception ex)<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new Exception(ex.Message);<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</p><p>以上的方法都可以实现dwg块的预览，显示在窗体上，但都太小了，根本看不请，达不到预览的效果！怎么可以让预览图案便大？要设计缩放吗？</p><p>&nbsp;</p><p>好像还有一种可以用autodesk volo view 来实现，好像只支持cad2002一下的版本啊！这一种我还没用过！</p><p>请高手给我指导指导，下午之前做不出来，会有麻烦的</p>

hellman 发表于 2009-5-12 15:08:00

有没有知道的？给个思路也行啊

雪山飞狐_lzh 发表于 2009-5-12 17:03:00

<p>确实很小，我现在是把块图像转成jpg文件然后放到资源里</p>

hellman 发表于 2009-5-12 19:43:00

lzh741206发表于2009-5-12 17:03:00static/image/common/back.gif确实很小，我现在是把块图像转成jpg文件然后放到资源里

<p></p>你把块转成jpg文件，难道你下次就不调用了吗？要是在调用怎么办？

雪山飞狐_lzh 发表于 2009-5-13 14:56:00

调用什么?

yunzhong80 发表于 2009-5-14 11:28:00

我也遇到这问题，期待那位大大解决

雪山飞狐_lzh 发表于 2009-5-15 21:51:00

本帖最后由 作者 于 2009-5-16 9:37:03 编辑

这几天收集Kean的专题，无意间发现了这个：
AutoCAD .NET version of the ObjectARX BlockView sample这里有个ObjectArx的解决方案，参考一下吧
总是需要在自定义控件上显示DWG图形，如在一个对话框上动态浏览一个DWG图形，于是写了一个控件，专门用来动态浏览DWG，这个控件从CStatic中派生，运用AcGs类库中的AcGsView，AcGsDevice，AcGsModel来协作显示DWG图形。
从CStatic派生，使用方便，只要在对话框中放一个CStatic，然后把CStatic的对象名换成fcGsPreviewCtrl即可。
fcGsPreviewCtrl.h
/********************************************************************
日 期： 2007/10/08
文件 名: fcgspreviewctrl.h
作 者： Racky Ye
单 位：
描 述： 用来预览DWG图形的控件
*********************************************************************/
#ifndef _FC_GS_PREVIEW_CTRL_H__
#define _FC_GS_PREVIEW_CTRL_H__
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "acgi.h"
#include <math.h>
#include "gs.h"
#include "acgs.h"
#include "acgsmanager.h"
// 用来预览DWG图形的控件
class fcGsPreviewCtrl : public CStatic
{
public:
fcGsPreviewCtrl();
virtual ~fcGsPreviewCtrl();
public:
//函数功能:传入dwg文件即可预览
BOOL Init(LPCTSTR szDwgFile);
//函数功能:传入数据库指针即可预览数据库中的实体
BOOL Init(AcDbDatabase *pDb);
// 缩放到整个图纸可见
void ZoomE();
void Clear();
protected:
void InitGS(HINSTANCE hRes); // 初始化图形系统
BOOL InitInner(AcDbDatabase *pDb); // 内部初始化
bool GetActiveViewPortInfo (ads_real &height, ads_real &width, AcGePoint3d &target,
AcGeVector3d &viewDir, ads_real &viewTwist, bool getViewCenter);
//获得块中的所有实体
void GetAllEnt(const AcDbObjectId& idBlockRec, AcDbObjectIdArray& IDArray);
//获得实体的范围
Acad::ErrorStatus GetEntExtents(const AcDbObjectId& idEnt, AcDbExtents& extents);
void GetEntExtents(const AcDbObjectIdArray& aridEnt, AcDbExtents& extents);
void Mid(const AcGePoint3d& pt1, const AcGePoint3d& pt2, AcGePoint3d& ptMid);
protected:
//{{AFX_MSG(fcGsPreviewCtrl)
afx_msg void OnPaint();
afx_msg void OnSize(UINT nType, int cx, int cy);
afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt);
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnMButtonDown(UINT nFlags, CPoint point);
afx_msg void OnMButtonUp(UINT nFlags, CPoint point);
afx_msg void OnMouseMove(UINT nFlags, CPoint point);
afx_msg UINT OnNcHitTest(CPoint point);
afx_msg void OnSetFocus(CWnd* pOldWnd);
afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
private:
AcDbExtents m_extents; // 图纸范围
HCURSOR m_hPanCursor; // 移动时的图标
HCURSOR m_hCrossCursor; // 十字图标
HCURSOR m_hOrbitCursor; // 旋转图标
AcGsView *m_pView; // 图形系统中的视图，用来绘制图形的区域
AcGsDevice *m_pDevice; // 图形系统中的设备，
AcGsModel *m_pModel;
bool m_bPanning; // 是否处于移动图形状态
bool m_bOrbiting; // 是否处于旋转图形状态
AcDbDatabase* m_pDb; // 该预览空间绑定的数据库
CPoint m_StartPt; // 移动或旋转时的起点
};
/////////////////////////////////////////////////////////////////////////////
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(_FC_GS_PREVIEW_CTRL_H__)
CPP文件：
/********************************************************************
日 期： 2007/10/08
文件 名: fcgspreviewctrl.cpp
作 者： Racky Ye
单 位：
描 述： 用来预览DWG图形的控件
*********************************************************************/
#include "StdAfx.h"
#include "resource.h"
#include "fcGsPreviewCtrl.h"
#include "dbents.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
fcGsPreviewCtrl::fcGsPreviewCtrl()
{
m_hPanCursor = NULL; // 移动时的图标
m_hCrossCursor = NULL; // 十字图标
m_hOrbitCursor = NULL; // 旋转图标
m_pView = NULL; // 图形系统中的视图，用来绘制图形的区域
m_pDevice = NULL; // 图形系统中的设备，
m_pModel = NULL;
m_bPanning = false; // 是否处于移动图形状态
m_bOrbiting = false; // 是否处于旋转图形状态
m_pDb = NULL; // 该预览空间绑定的数据库
}
fcGsPreviewCtrl::~fcGsPreviewCtrl()
{
Clear();
}
BEGIN_MESSAGE_MAP(fcGsPreviewCtrl, CStatic)
//{{AFX_MSG_MAP(fcGsPreviewCtrl)
ON_WM_PAINT()
ON_WM_SIZE()
ON_WM_MOUSEWHEEL()
ON_WM_LBUTTONDOWN()
ON_WM_MBUTTONDOWN()
ON_WM_MBUTTONUP()
ON_WM_MOUSEMOVE()
ON_WM_NCHITTEST()
ON_WM_SETFOCUS()
ON_WM_LBUTTONUP()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// fcGsPreviewCtrl message handlers
void fcGsPreviewCtrl::OnPaint()
{
CPaintDC dc(this);
//刷新图形系统视图
if (m_pView)
{
m_pView->invalidate();
m_pView->update();
}
}
void fcGsPreviewCtrl::OnSize(UINT nType, int cx, int cy)
{
CRect rect;
if (m_pDevice)
{
GetClientRect(&rect);
m_pDevice->onSize(rect.Width(), rect.Height());
}
}
BOOL fcGsPreviewCtrl::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
if (m_pView)
{
if (zDelta < 0)
m_pView->zoom(0.5);
else
m_pView->zoom(1.5);
Invalidate();
}
return TRUE;
}
void fcGsPreviewCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
SetFocus();
//设置光标样式
m_bOrbiting = true;
SetCapture();
::SetClassLong(m_hWnd, GCL_HCURSOR, NULL);
::SetCursor(m_hOrbitCursor);
m_StartPt = point;
}
void fcGsPreviewCtrl::OnMButtonDown(UINT nFlags, CPoint point)
{
//开始移动
m_bPanning = true;
SetCapture();
::SetClassLong(m_hWnd,GCL_HCURSOR,NULL);
::SetCursor(m_hPanCursor);
m_StartPt = point;
}
void fcGsPreviewCtrl::OnMButtonUp(UINT nFlags, CPoint point)
{
ReleaseCapture();
m_bPanning = false;
::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor);
}
//函数功能:鼠标滚轮放大缩小视图
void fcGsPreviewCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
if (m_pView)
{
if (m_bPanning)
{
//完成从设备坐标系统到世界坐标系统的转换
AcGeVector3d pan_vec(-(point.x-m_StartPt.x),point.y-m_StartPt.y,0);
pan_vec.transformBy(m_pView->viewingMatrix() * m_pView->worldToDeviceMatrix().inverse());
m_pView->dolly(pan_vec);
Invalidate();
m_StartPt = point;
}
else if (m_bOrbiting)
{
const double Half_Pi = 1.570796326795;
AcGsDCRect view_rect;
m_pView->getViewport (view_rect);
int nViewportX = (view_rect.m_max.x - view_rect.m_min.x) + 1;
int nViewportY = (view_rect.m_max.y - view_rect.m_min.y) + 1;
int centerX = int(nViewportX / 2.0f) + view_rect.m_min.x;
int centerY = int(nViewportY / 2.0f) + view_rect.m_min.y;
const double radius = min (nViewportX, nViewportY) * 0.4f;
// 从最后和新的鼠标位置计算出两个矢量
AcGeVector3d last_vector ((m_StartPt.x - centerX) / radius,
-(m_StartPt.y - centerY) / radius,
0.0);
if (last_vector.lengthSqrd () > 1.0) // 超出半径范围
last_vector.normalize ();
else
last_vector.z = sqrt (1.0 - last_vector.x * last_vector.x - last_vector.y * last_vector.y);
AcGeVector3d new_vector((point.x - centerX) / radius,
-(point.y - centerY) / radius,
0.0);
if (new_vector.lengthSqrd () > 1.0) // 超出半径范围
new_vector.normalize ();
else
new_vector.z = sqrt (1.0 - new_vector.x * new_vector.x - new_vector.y * new_vector.y);
// 确定相机操作的角度
AcGeVector3d rotation_vector (last_vector);
rotation_vector = rotation_vector.crossProduct (new_vector); // rotation_vector = last_vector x new_vector
AcGeVector3d work_vector (rotation_vector);
work_vector.z = 0.0f; // rotation_vector到xy平面的投影
double roll_angle = atan2 (work_vector.x, work_vector.y); // 假设相机的向上矢量是朝上的
// 计算向上的矢量和工作矢量的夹角
double length = rotation_vector.length ();
double orbit_y_angle = (length != 0.0) ? acos (rotation_vector.z / length) + Half_Pi : Half_Pi; // represents inverse cosine of the dot product of the
if (length > 1.0f)
length = 1.0f;
double rotation_angle = asin (length);
// view操作
m_pView->roll( roll_angle);
m_pView->orbit( 0.0f, orbit_y_angle);
m_pView->orbit( rotation_angle, 0.0f);
m_pView->orbit( 0.0f, -orbit_y_angle);
m_pView->roll(-roll_angle);
Invalidate();
m_StartPt = point;
}
else
{
::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor);
SetFocus();
}
}
}
UINT fcGsPreviewCtrl::OnNcHitTest(CPoint point)
{
return HTCLIENT;
}
void fcGsPreviewCtrl::OnSetFocus(CWnd* pOldWnd)
{
::SetClassLong(m_hWnd, GCL_HCURSOR, (long)m_hCrossCursor);
}
void fcGsPreviewCtrl::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bOrbiting = false;
::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor);
ReleaseCapture();
}
void fcGsPreviewCtrl::Clear()
{
AcGsManager *pGsManager = acgsGetGsManager();
RXASSERT(pGsManager);
if (m_pView)
{
m_pView->eraseAll();
if (m_pDevice)
{
bool b = m_pDevice->erase(m_pView);
RXASSERT(b);
}
AcGsClassFactory *pFactory = pGsManager->getGSClassFactory();
RXASSERT(pFactory);
pFactory->deleteView(m_pView);
m_pView = NULL;
}
if (m_pModel)
{
pGsManager->destroyAutoCADModel(m_pModel);
m_pModel = NULL;
}
if (m_pDevice)
{
pGsManager->destroyAutoCADDevice(m_pDevice);
m_pDevice = NULL;
}
if (m_pDb)
{
delete m_pDb;
m_pDb = NULL;
}
}
//函数功能:传入dwg文件即可预览
BOOL fcGsPreviewCtrl::Init(LPCTSTR szDwgFile)
{
Clear();
m_pDb = new AcDbDatabase(false,true);
Acad::ErrorStatus es = m_pDb->readDwgFile(szDwgFile);
if (es != Acad::eOk)
{
delete m_pDb;
m_pDb = NULL;
}
return InitInner(m_pDb);
}
//函数功能:传入数据库指针即可预览数据库中的实体
BOOL fcGsPreviewCtrl::Init(AcDbDatabase *pDb)
{
Clear();
return InitInner(pDb);
}
//函数功能:获得当前视口的信息。
//输出参数:height 视口高度，width 视口宽度，target 视口中心点，viewDir 视口的观察向量，twist 扭曲的视口
bool fcGsPreviewCtrl::GetActiveViewPortInfo (ads_real &height, ads_real &width,
AcGePoint3d &target, AcGeVector3d &viewDir,
ads_real &viewTwist, bool getViewCenter)
{
AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();
if (pDb == NULL)
return false;
AcDbViewportTable *pVTable = NULL;
Acad::ErrorStatus es = pDb->getViewportTable (pVTable, AcDb::kForRead);
if (es == Acad::eOk)
{
AcDbViewportTableRecord *pViewPortRec = NULL;
es = pVTable->getAt ("*Active", pViewPortRec, AcDb::kForRead);
if (es == Acad::eOk)
{
height = pViewPortRec->height ();
width = pViewPortRec->width ();
if (getViewCenter == true)
{
struct resbuf rb;
memset (&rb, 0, sizeof (struct resbuf));
acedGetVar ("VIEWCTR", &rb);
target = AcGePoint3d (rb.resval.rpoint, rb.resval.rpoint, rb.resval.rpoint);
}
else
{
target = pViewPortRec->target ();
}
viewDir = pViewPortRec->viewDirection ();
viewTwist = pViewPortRec->viewTwist ();
}
pVTable->close ();
pViewPortRec->close();
}
return (true);
}
//函数功能:初始化图形系统
void fcGsPreviewCtrl::InitGS(HINSTANCE hRes)
{
// 加载光标
if (m_hPanCursor == NULL)
m_hPanCursor = LoadCursor(hRes,MAKEINTRESOURCE(IDI_PAN));
if (m_hCrossCursor == NULL)
m_hCrossCursor = LoadCursor(hRes,MAKEINTRESOURCE(IDI_CROSS));
if (m_hOrbitCursor == NULL)
m_hOrbitCursor = LoadCursor(hRes,MAKEINTRESOURCE(IDI_ORBIT));
::SetClassLong(m_hWnd,GCL_HCURSOR,NULL);
// 初始化视图
// 获得图形系统管理器
AcGsManager *pGsManager = acgsGetGsManager();
RXASSERT(pGsManager);
// 获得图形系统类工厂
AcGsClassFactory *pFactory = pGsManager->getGSClassFactory();
RXASSERT(pFactory);
// 创建图形系统设备
m_pDevice = pGsManager->createAutoCADDevice(m_hWnd);
RXASSERT(m_pDevice);
CRect rect;
GetClientRect(&rect);
m_pDevice->onSize(rect.Width(), rect.Height());
// 创建图形系统视图
m_pView = pFactory->createView();
RXASSERT(m_pView);
m_pModel = pGsManager->createAutoCADModel();
RXASSERT(m_pModel);
m_pDevice->add(m_pView);
double height = 0.0, width = 0.0, viewTwist = 0.0;
AcGePoint3d ptTargetView;
AcGeVector3d vecViewDir;
GetActiveViewPortInfo (height, width, ptTargetView, vecViewDir, viewTwist, true);
m_pView->setView(ptTargetView + vecViewDir, ptTargetView,
AcGeVector3d(0.0, 1.0, 0.0), 1.0, 1.0);
}
BOOL fcGsPreviewCtrl::InitInner(AcDbDatabase *pDb)
{
if (pDb == NULL)
{
m_pDb = new AcDbDatabase(true, true);
}
else
{
m_pDb = pDb;
}
if (m_pDb == NULL)
return FALSE;
Acad::ErrorStatus es = Acad::eOk;
AcDbBlockTableRecord *pRec = NULL;
AcDbBlockTable *pTab = NULL;
if ((es = m_pDb->getBlockTable(pTab, AcDb::kForRead))!=Acad::eOk)
return FALSE;
if ((es = pTab->getAt(ACDB_MODEL_SPACE,pRec,AcDb::kForRead))!=Acad::eOk)
{
pTab->close();
return FALSE;
}
pTab->close();
AcDbObjectId idRec = pRec->id();
AcDbObjectIdArray aridEnt;
GetAllEnt(idRec, aridEnt);
GetEntExtents(aridEnt, m_extents);
InitGS(_hdllInstance);
m_pView->add(pRec, m_pModel);
pRec->close();
ZoomE();
return TRUE;
}
// 缩放到整个图纸可见
void fcGsPreviewCtrl::ZoomE()
{
AcGePoint3d ptTargetView;
Mid(m_extents.maxPoint(), m_extents.minPoint(), ptTargetView);
double dLenght = m_extents.maxPoint().x - m_extents.minPoint().x;
double dWidth = m_extents.maxPoint().y - m_extents.minPoint().y;
m_pView->setView(ptTargetView + AcGeVector3d::kZAxis,ptTargetView,AcGeVector3d::kYAxis,dLenght*1.05,dWidth*1.05);
OnPaint();
}
void fcGsPreviewCtrl::Mid(const AcGePoint3d& pt1, const AcGePoint3d& pt2, AcGePoint3d& ptMid)
{
ptMid.x = 0.5 *(pt1.x + pt2.x);
ptMid.y = 0.5 *(pt1.y + pt2.y);
ptMid.z = 0.5 *(pt1.z + pt2.z);
}
//函数功能:获得块中的所有实体
void fcGsPreviewCtrl::GetAllEnt(const AcDbObjectId& idBlockRec, AcDbObjectIdArray& IDArray)
{
IDArray.setPhysicalLength(0);
Acad::ErrorStatus es;
AcDbBlockTableRecord *pBlkRec = NULL;
if (Acad::eOk != (es = acdbOpenObject(pBlkRec,idBlockRec,AcDb::kForRead)))
{
return;
}
AcDbBlockTableRecordIterator *pIt = NULL;
pBlkRec->newIterator(pIt);
pBlkRec->close();
for (pIt->start(); !pIt->done(); pIt->step())
{
AcDbObjectId idEnt;
if (Acad::eOk == pIt->getEntityId(idEnt))
{
IDArray.append(idEnt);
}
}
delete pIt;
pIt = NULL;
}
//函数功能:获得实体的范围
Acad::ErrorStatus fcGsPreviewCtrl::GetEntExtents(const AcDbObjectId& idEnt, AcDbExtents& extents)
{
Acad::ErrorStatus es;
AcDbEntity *pEnt = NULL;
if (Acad::eOk == acdbOpenObject(pEnt, idEnt, AcDb::kForRead))
{
AcDbBlockReference *pBlkRef = AcDbBlockReference::cast(pEnt);
if (pBlkRef)
{
es = pBlkRef->geomExtentsBestFit(extents);
}
else
{
es = pEnt->getGeomExtents(extents);
}
pEnt->close();
}
return (es);
}
void fcGsPreviewCtrl::GetEntExtents(const AcDbObjectIdArray& aridEnt, AcDbExtents& extents)
{
for (int i = 0; i<aridEnt.length();i++)
{
AcDbExtents tem;
if (GetEntExtents(aridEnt, tem) == Acad::eOk)
{
extents.addExt(tem);
}
}
}

雪山飞狐_lzh 发表于 2009-5-16 09:58:00

hellman 发表于 2009-5-20 16:38:00

还有个问题想问一下高人啊！在插入一个文件中的块到当前文件中，在插入之前怎么先获得这个块的大小？？？

雪山飞狐_lzh 发表于 2009-5-20 16:55:00

本帖最后由 作者 于 2009-5-20 17:24:18 编辑

你可以在将块引用加入数据库前调用GeometricExtents属性获取
或者遍历块定义实体
参考下上面ObjectArx的GetEntExtents方法
或者试下：      
      public static void Test5()
      {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead, false);
                BlockTableRecord btr = (BlockTableRecord)tr.GetObject(bt["myblock"], OpenMode.ForRead, false);
                Extents3d ext3d = new Extents3d();
                ext3d.AddBlockExtents(btr);
                doc.Editor.WriteMessage("\n{0}\n{1}", ext3d.MinPoint, ext3d.MaxPoint);
            }
      }


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