[CommandMethod("changeZoom")]
static public void CommandChangeViewportZoom()
{
// access database and editor
Database db = Application.DocumentManager.
MdiActiveDocument.Database;
Editor ed = Application.DocumentManager.
MdiActiveDocument.Editor;
using (Transaction tr = db.
TransactionManager.StartTransaction())
{
LayoutManager layoutMgr = LayoutManager.Current;
Layout layoutObj;
DBDictionary layoutDict;
ed.WriteMessage("Number of Layouts = {0}\n",
layoutMgr.LayoutCount);
ed.WriteMessage("Current Layout = {0}\n",
layoutMgr.CurrentLayout);
Point3d x_Min = db.Extmin;
Point3d x_Max = db.Extmax;
using (layoutDict = tr.GetObject(db.LayoutDictionaryId,
OpenMode.ForRead) as DBDictionary)
{
foreach (DictionaryEntry layoutEntry in layoutDict)
{
using (layoutObj = tr.GetObject(
(ObjectId)(layoutEntry.Value),
OpenMode.ForRead) as Layout)
{
// Set the CurrentLayout to the layout
// if it is not Modelspace
if (layoutObj.LayoutName != "Model")
layoutMgr.CurrentLayout = layoutObj.LayoutName;
ed.WriteMessage("Layout Name = {0}\n",
layoutObj.LayoutName);
BlockTableRecord r = tr.GetObject(
layoutObj.BlockTableRecordId,
OpenMode.ForRead) as BlockTableRecord;
foreach (ObjectId obj in r)
{
DBObject dbobj = tr.GetObject(obj, OpenMode.ForRead);
Viewport vp = dbobj as Viewport;
if (vp != null)
{
ed.WriteMessage("\nnumber of Viewport = {0}",
vp.Number);
// get the screen aspect ratio to calculate
// the height and width
double mScrRatio;
// width/height
mScrRatio = (vp.Width / vp.Height);
Point3d mMaxExt = db.Extmax;
Point3d mMinExt = db.Extmin;
Extents3d mExtents = new Extents3d();
mExtents.Set(mMinExt, mMaxExt);
// prepare Matrix for DCS to WCS transformation
Matrix3d matWCS2DCS;
matWCS2DCS = Matrix3d.PlaneToWorld(vp.ViewDirection);
matWCS2DCS = Matrix3d.Displacement(
vp.ViewTarget - Point3d.Origin)
* matWCS2DCS;
matWCS2DCS = Matrix3d.Rotation(
-vp.TwistAngle, vp.ViewDirection,
vp.ViewTarget) * matWCS2DCS;
matWCS2DCS = matWCS2DCS.Inverse();
// tranform the extents to the DCS
// defined by the viewdir
mExtents.TransformBy(matWCS2DCS);
// width of the extents in current view
double mWidth;
mWidth = (mExtents.MaxPoint.X - mExtents.MinPoint.X);
// height of the extents in current view
double mHeight;
mHeight = (mExtents.MaxPoint.Y - mExtents.MinPoint.Y);
// get the view center point
Point2d mCentPt = new Point2d(
((mExtents.MaxPoint.X + mExtents.MinPoint.X) * 0.5),
((mExtents.MaxPoint.Y + mExtents.MinPoint.Y) * 0.5));
// check if the width ‘fits‘ in current window,
// if not then get the new height as
// per the viewports aspect ratio
if (mWidth > (mHeight * mScrRatio))
mHeight = mWidth / mScrRatio;
// set the viewport parameters
if (vp.Number == 2)
{
vp.UpgradeOpen();
// set the view height - adjusted by 1%
vp.ViewHeight = mHeight * 1.01;
// set the view center
vp.ViewCenter = mCentPt;
vp.Visible = true;
vp.On = true;
vp.UpdateDisplay();
ed.SwitchToModelSpace();
Application.SetSystemVariable("CVPORT", vp.Number);
}
if (vp.Number == 3)
{
vp.UpgradeOpen();
vp.ViewHeight = mHeight * 1.25;
//set the view center
vp.ViewCenter = mCentPt;
vp.Visible = true;
vp.On = true;
vp.UpdateDisplay();
ed.SwitchToModelSpace();
Application.SetSystemVariable("CVPORT", vp.Number);
}
}
}
}
}
}
tr.Commit();
}
}
原文地址：http://www.cnblogs.com/swtool/p/3832314.html
