/// <summary>
/// 确保布局中的图纸显示在布局中的中间，而不需要使用缩放命令来显示
/// </summary>
/// <param name="db">数据库对象</param>
/// <param name="layoutName">布局的名称</param>
public static void CenterLayoutViewport(this Database db, string layoutName)
{
Extents3d ext = db.GetAllEntsExtent();
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = db.BlockTableId.GetObject(OpenMode.ForRead) as BlockTable;
foreach (ObjectId btrId in bt)
{
BlockTableRecord btr = btrId.GetObject(OpenMode.ForRead) as BlockTableRecord;
if (btr.IsLayout)
{
Layout layout = btr.LayoutId.GetObject(OpenMode.ForRead) as Layout;
if (layout.LayoutName.CompareTo(layoutName) == 0)
{
int vpIndex = 0;
ObjectId firstViewportId = new ObjectId();
ObjectId secondViewportId = new ObjectId();
foreach (ObjectId entId in btr)
{
Entity ent = entId.GetObject(OpenMode.ForWrite) as Entity;
if (ent is Viewport)
{
if (vpIndex == 0)
{
firstViewportId = entId;
vpIndex++;
}
else if (vpIndex == 1)
{
secondViewportId = entId;
}
}
}
// 布局复制过来之后得到了两个视口，第一个视口与模型空间关联，第二个视口则是在正确的位置上
if (firstViewportId.IsValid && secondViewportId.IsValid)
{
Viewport secondVP = secondViewportId.GetObject(OpenMode.ForWrite) as Viewport;
secondVP.ColorIndex = 1;
secondVP.Erase();
Viewport firstVP = firstViewportId.GetObject(OpenMode.ForWrite) as Viewport;
firstVP.CenterPoint = secondVP.CenterPoint;
firstVP.Height = secondVP.Height;
firstVP.Width = secondVP.Width;
firstVP.ColorIndex = 5;
Point3d midPt = GeTools.MidPoint(ext.MinPoint, ext.MaxPoint);
firstVP.ViewCenter = new Point2d(midPt.X, midPt.Y);;
double xScale = secondVP.Width / ((ext.MaxPoint.X - ext.MinPoint.X) * 1.1);
double yScale = secondVP.Height / ((ext.MaxPoint.Y - ext.MinPoint.Y) * 1.1);
firstVP.CustomScale = Math.Min(xScale, yScale);
}
}
}
}
trans.Commit();
}
}
/// <summary>
/// 根据外接矩形创建椭圆
/// </summary>
/// <param name="ellipse">椭圆对象</param>
/// <param name="pt1">外接矩形的角点</param>
/// <param name="pt2">外接矩形的角点</param>
public static void CreateEllipse(this Ellipse ellipse, Point3d pt1, Point3d pt2)
{
//椭圆的中心点
Point3d center = GeTools.MidPoint(pt1, pt2);
Vector3d normal = Vector3d.ZAxis;//法向量
//椭圆1/2长轴的矢量，矢量的起点为椭圆的中心，终点为椭圆长轴的一个端点
Vector3d majorAxis = new Vector3d(Math.Abs(pt1.X - pt2.X) / 2, 0, 0);
//椭圆短轴与长轴的长度比例
double ratio = Math.Abs((pt1.Y - pt2.Y) / (pt1.X - pt2.X));
//设置椭圆的参数
ellipse.Set(center, normal, majorAxis, ratio, 0, 2 * Math.PI);
}
/// <summary>
/// 两点创建圆
/// </summary>
/// <param name="circle">圆对象</param>
/// <param name="startPoint">起点</param>
/// <param name="endPoint">终点</param>
public static void CreateCircle(this Circle circle, Point3d startPoint, Point3d endPoint)
{
circle.Center = GeTools.MidPoint(startPoint, endPoint);
circle.Radius = startPoint.DistanceTo(endPoint) / 2;
}