/// <summary>
/// 获取矩形属性
/// </summary>
public static RectangleData GetRectangleData(this Database db, ObjectId id)
{
RectangleData data = new RectangleData();
if (db.IsRectangle(id))
{
PLineData plinedata = db.GetPLineData(id);
for (int i = 0; i < 4; i++)
{
Vector3d vec1 = plinedata.Vectors[i];
Vector3d vec2 = plinedata.Vectors[(i + 1) % 4];
if (vec1 == new Vector3d(1, 0, 0) && vec2 == new Vector3d(0, 1, 0))
{
data.IsClockWise = false;
data.BasePointIndex = i;
data.BasePoint = plinedata.VertexPoints[i];
}
else if (vec1 == new Vector3d(0, 1, 0) && vec2 == new Vector3d(1, 0, 0))
{
data.IsClockWise = true;
data.BasePointIndex = i;
data.BasePoint = plinedata.VertexPoints[i];
}
}
Point3d p0 = plinedata.VertexPoints[0];
Point3d p2 = plinedata.VertexPoints[2];
data.Width = Math.Abs(p2.X - p0.X);
data.Height = Math.Abs(p2.Y - p0.Y);
}
return(data);
}
/// <summary>
/// 判断多段线是否为矩形
/// </summary>
public static bool IsRectangle(this Database db, ObjectId id)
{
bool flag = false;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
// 获取图形对象
Entity ent = trans.GetObject(id, OpenMode.ForWrite) as Entity;
if (ent.GetType() == typeof(Polyline))
{
db.PLinePurge(id);
PLineData plinedata = db.GetPLineData(id);
if (plinedata.VertexCount == 4)
{
if (plinedata.Vectors[0].DotProduct(plinedata.Vectors[1]).ToString() == "0" &&
plinedata.Vectors[1].DotProduct(plinedata.Vectors[2]).ToString() == "0" &&
plinedata.Vectors[2].DotProduct(plinedata.Vectors[3]).ToString() == "0")
{
flag = true;
}
}
}
trans.Commit();
}
return(flag);
}
/// <summary>
/// 获取多段线属性
/// </summary>
public static PLineData GetPLineData(this Database db, ObjectId Id)
{
PLineData data = new PLineData();
using (Transaction trans = db.TransactionManager.StartTransaction())
{
Entity ent = trans.GetObject(Id, OpenMode.ForRead) as Entity;
data.PLineId = Id;
try
{
Polyline pline = ent as Polyline;
data.StartPoint = pline.StartPoint;
data.EndPoint = pline.EndPoint;
data.Length = pline.Length;
data.VertexCount = pline.NumberOfVertices;
data.IsClosed = pline.Closed;
data.VertexPoints = new Point3d[data.VertexCount];
data.Vectors = new Vector3d[data.VertexCount];
for (int i = 0; i < data.VertexCount; i++)
{
data.VertexPoints[i] = pline.GetPoint3dAt(i);
data.Vectors[i] = pline.GetFirstDerivative(pline.GetPoint3dAt(i)).GetNormal();
}
}
catch (Autodesk.AutoCAD.Runtime.Exception e)
{
throw e;
}
trans.Commit();
}
return(data);
}
/// <summary>
/// 删除多段线中的多余点并将应闭合的多段线闭合
/// </summary>
public static void PLinePurge(this Database db, ObjectId id)
{
using (Transaction trans = db.TransactionManager.StartTransaction())
{
// 打开块表
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
// 打开块表记录
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead);
// 获取图形对象
Entity ent = trans.GetObject(id, OpenMode.ForWrite) as Entity;
if (ent.GetType() == typeof(Polyline))
{
Polyline pline = ent as Polyline;
PLineData plinedata = db.GetPLineData(id);
/// 删除多段线中的多余点
if (plinedata.VertexCount > 2)
{
// 为避免下标出现问题, 从下标最大处开始遍历
for (int i = plinedata.VertexCount - 2; i > 0; i--)
{
if (plinedata.Vectors[i - 1] == plinedata.Vectors[i])
{
btr.UpgradeOpen();
pline.RemoveVertexAt(i);
btr.DowngradeOpen();
}
}
}
// 重新读取
plinedata = db.GetPLineData(id);
if (plinedata.VertexPoints[0] == plinedata.VertexPoints[plinedata.VertexCount - 1])
{
btr.UpgradeOpen();
pline.Closed = true;
pline.RemoveVertexAt(plinedata.VertexCount - 1);
btr.DowngradeOpen();
}
}
trans.Commit();
}
}
