//从符号创建几何形体
private static IGeometry CreateGeometryFromSymbol(ISymbol sym, IEnvelope env)
{
if (sym is IMarkerSymbol)
{
IArea area = (IArea)env;
return((IGeometry)area.Centroid);
}
else if (sym is ILineSymbol || sym is ITextSymbol)
{
IPolyline line = new PolylineClass();
IPoint pt = new PointClass();
pt.PutCoords(env.LowerLeft.X, (env.LowerLeft.Y + env.UpperRight.Y) / 2);
line.FromPoint = pt;
pt = new PointClass();
pt.PutCoords(env.UpperRight.X, (env.LowerLeft.Y + env.UpperRight.Y) / 2);
line.ToPoint = pt;
return((IGeometry)line);
}
else if (sym is IFillSymbol)
{
IPolygon polygon = new PolygonClass();
IPointCollection ptCol = (IPointCollection)polygon;
IPoint pt = new PointClass();
pt.PutCoords(env.LowerLeft.X, env.LowerLeft.Y);
ptCol.AddPoints(1, ref pt);
pt.PutCoords(env.UpperLeft.X, env.UpperLeft.Y);
ptCol.AddPoints(1, ref pt);
pt.PutCoords(env.UpperRight.X, env.UpperRight.Y);
ptCol.AddPoints(1, ref pt);
pt.PutCoords(env.LowerRight.X, env.LowerRight.Y);
ptCol.AddPoints(1, ref pt);
pt.PutCoords(env.LowerLeft.X, env.LowerLeft.Y);
ptCol.AddPoints(1, ref pt);
return((IGeometry)polygon);
}
else
{
return(null);
}
}
private static IGeometry CreateGeometryFromSymbol(ISymbol sym, IEnvelope env)
{
IPoint point;
if (sym is IMarkerSymbol)
{
IArea area = (IArea)env;
return(area.Centroid);
}
if ((sym is ILineSymbol) || (sym is ITextSymbol))
{
IPolyline polyline = new PolylineClass();
point = new PointClass();
point.PutCoords(env.LowerLeft.X, (env.LowerLeft.Y + env.UpperRight.Y) / 2.0);
polyline.FromPoint = point;
point = new PointClass();
point.PutCoords(env.UpperRight.X, (env.LowerLeft.Y + env.UpperRight.Y) / 2.0);
polyline.ToPoint = point;
if (sym is ITextSymbol)
{
(sym as ITextSymbol).Text = "样本字符";
}
return(polyline);
}
if (sym is IFillSymbol)
{
IPolygon polygon = new PolygonClass();
IPointCollection points = (IPointCollection)polygon;
point = new PointClass();
point.PutCoords(env.LowerLeft.X, env.LowerLeft.Y);
points.AddPoints(1, ref point);
point.PutCoords(env.UpperLeft.X, env.UpperLeft.Y);
points.AddPoints(1, ref point);
point.PutCoords(env.UpperRight.X, env.UpperRight.Y);
points.AddPoints(1, ref point);
point.PutCoords(env.LowerRight.X, env.LowerRight.Y);
points.AddPoints(1, ref point);
point.PutCoords(env.LowerLeft.X, env.LowerLeft.Y);
points.AddPoints(1, ref point);
return(polygon);
}
return(null);
}
/// <summary>
/// 转化包络为几何面形状
/// </summary>
/// <param name="geometry">ESRI几何形状接口</param>
/// <returns>ESRI几何形状（面）接口</returns>
public static IGeometry ConvertEnvelopeToPolygon(IGeometry geometry)
{
if ((IsValidGeometry(geometry)) && (geometry is IEnvelope))
{
IEnvelope envelope = (IEnvelope)geometry;
IGeometry polygon = new Polygon() as IGeometry;
IPointCollection pointCollection = (IPointCollection)polygon;
IPoint point = envelope.LowerLeft;
pointCollection.AddPoints(1, ref point);
point = envelope.LowerRight;
pointCollection.AddPoints(1, ref point);
point = envelope.UpperRight;
pointCollection.AddPoints(1, ref point);
point = envelope.UpperLeft;
pointCollection.AddPoints(1, ref point);
ITopologicalOperator topoOp = (ITopologicalOperator)polygon;
topoOp.Simplify();
return(polygon);
}
else
{
return(null);
}
}
