.NET - how to set the zoom in Paperspace Viewports
问题：
I need to control the zoom value in viewports on a layout. How can this be done using the .NET API????
解答：
Attached is a C# project with two custom commands. "TestVP" command iterates through all of the layouts and changes the zoom by setting the ViewHeight and ViewCenter of the viewports. The CVPORT variable is used to set the current viewport. This example uses the extents of the database so run the code in a drawing that has at least one entity. Please note that only viewports with the number 2 and 3 are handled in this example. "NewLayout" command in the example project creates a new layout and adds a viewport.
static public void TestVP()
{
Database db = HostApplicationServices.WorkingDatabase;
Autodesk.AutoCAD.EditorInput.Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
//db.TileMode = false;
try
{
Transaction tr;
using (tr = db.TransactionManager.StartTransaction())
{
LayoutManager layoutMgr = LayoutManager.Current;
Layout layoutObj;
DBDictionary layoutDict;
ed.WriteMessage("Number of Layouts = " + layoutMgr.LayoutCount.ToString() + "\n");
ed.WriteMessage("Current Layout = " + layoutMgr.CurrentLayout + "\n");
Point3d x_Min = db.Extmin;
Point3d x_Max = db.Extmax;
using (layoutDict = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForRead))
{
foreach (DictionaryEntry layoutEntry in layoutDict)
{
using (layoutObj = (Layout)tr.GetObject((ObjectId)(layoutEntry.Value), OpenMode.ForRead))
{
// Set the CurrentLayout to the layout if it is not Modelspace
if(layoutObj.LayoutName.ToString()!= "Model")
layoutMgr.CurrentLayout = layoutObj.LayoutName.ToString();
ed.WriteMessage("Layout Name = " + layoutObj.LayoutName + "\n");
BlockTableRecord r = (BlockTableRecord)tr.GetObject(layoutObj.BlockTableRecordId, OpenMode.ForRead);
foreach (ObjectId obj in r)
{
DBObject dbobj = tr.GetObject(obj, OpenMode.ForRead);
Autodesk.AutoCAD.DatabaseServices.Viewport vp = dbobj as Autodesk.AutoCAD.DatabaseServices.Viewport;
if (vp != null)
{
ed.WriteMessage("\nnumber of Viewport = " + vp.Number.ToString());
//get the screen aspect ratio to calculate the height and width
double mScrRatio;
mScrRatio = (vp.Width / vp.Height);//width/height
Point3d mMaxExt = db.Extmax;
Point3d mMinExt = db.Extmin;
Extents3d mExtents;
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();
vp.ViewHeight = mHeight * 1.01; //set the view height - adjusted by 1%
vp.ViewCenter = mCentPt; //set the view center
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;
vp.ViewCenter = mCentPt; //set the view center
vp.Visible = true;
vp.On = true;
vp.UpdateDisplay();
ed.SwitchToModelSpace();
Application.SetSystemVariable("CVPORT", vp.Number);
}
}//if
}//for each
}//using layoutObj
}//for each dictionaryEntry
}//using layout dict
tr.Commit();
}
}
catch (System.Exception ex)
{
ed.WriteMessage(ex.ToString());
}
}
{:1_10:}{:1_14:}
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