public static IPointCollection TriangleToPolygon(ITinTriangle itinTriangle_0)
{
IPointCollection pointCollection = new Ring();
itinTriangle_0.QueryAsRing(pointCollection as IRing);
IPointCollection pointCollection2 = new Polygon();
pointCollection2.AddPointCollection(pointCollection);
return(pointCollection2);
}
public static IPolygon CreatePolygonByPoints(List <IPoint> points_list)
{
IPolygon pPolygon;
IPointCollection polygon_pt_cl = new Polygon();
IPolyline pPolyline = new Polyline() as IPolyline;
// create new pointcollection
IPointCollection line_pt_cl = pPolyline as IPointCollection;
object o = Type.Missing;
foreach (IPoint point in points_list)
{
line_pt_cl.AddPoint(point, ref o, ref o);
}
//create polygon from pointcollection
polygon_pt_cl.AddPointCollection(line_pt_cl);
pPolygon = polygon_pt_cl as IPolygon;
pPolygon.Close();
return(pPolygon);
}
private void CalculateArea(int x, int y, int pntnum)
{
double num;
string str;
string str1 = string.Concat(" 平方", this.GetUnitDesc(_context.FocusMap.MapUnits));
object value = Missing.Value;
IPoint mapPoint = ((IActiveView)this._context.FocusMap).ScreenDisplay.DisplayTransformation.ToMapPoint(x, y);
if (!(pntnum != 1 ? true : this._polygonFeedback != null))
{
this._polygonFeedback = new NewPolygonFeedbackClass();
this._polygonFeedback.Start(mapPoint);
this._polygonFeedback.Display = ((IActiveView)this._context.FocusMap).ScreenDisplay;
this._pointCollection = new Polygon() as IPointCollection;
this._pointCollection.AddPoint(mapPoint, ref value, ref value);
graphicsContainer.DeleteAllElements();
((IActiveView)this._context.FocusMap).PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}
else if (this._polygonFeedback != null)
{
switch (pntnum)
{
case 1:
{
this._polygonFeedback.AddPoint(mapPoint);
this._pointCollection.AddPoint(mapPoint, ref value, ref value);
if (this._pointCollection.PointCount > 2)
{
ITextElement textElement = new ParagraphTextElementClass();
IPointCollection polygonClass = new Polygon() as IPointCollection;
polygonClass.AddPointCollection(this._pointCollection);
polygonClass.AddPoint(_pointCollection.Point[0]);
num = Math.Abs(((IArea)polygonClass).Area);
str = string.Concat("总面积 = ", num.ToString("#.##"), str1);
textElement.Text = str;
textElement.Symbol = pDistSymbol;
IElement element = textElement as IElement;
element.Geometry = polygonClass as IGeometry;
graphicsContainer.DeleteAllElements();
graphicsContainer.AddElement(element, 0);
((IActiveView)this._context.FocusMap).PartialRefresh(esriViewDrawPhase.esriViewGraphics,
null, null);
}
break;
}
case 2:
{
this._polygonFeedback.MoveTo(mapPoint);
if (this._pointCollection.PointCount <= 1)
{
break;
}
IPointCollection polygonClass = new Polygon() as IPointCollection;
polygonClass.AddPointCollection(this._pointCollection);
polygonClass.AddPoint(mapPoint, ref value, ref value);
num = Math.Abs(((IArea)polygonClass).Area);
str = string.Concat("总面积 = ", num.ToString("#.##"), str1);
//ITextElement textElement = new ParagraphTextElementClass();
//textElement.Text = str;
//textElement.Symbol = pDistSymbol;
//IElement element = textElement as IElement;
//element.Geometry = polygonClass as IGeometry;
//graphicsContainer.DeleteAllElements();
//graphicsContainer.AddElement(element, 0);
//activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
break;
}
case 3:
{
IPolygon polygon = this._polygonFeedback.Stop();
if (polygon.IsEmpty)
{
// this.m_HookHelper.SetStatus("");
}
else
{
num = Math.Abs(((IArea)polygon).Area);
str = string.Concat("总面积 = ", num.ToString("#.##"), str1);
ITextElement textElement = new ParagraphTextElementClass();
textElement.Text = str;
textElement.Symbol = pDistSymbol;
IElement element = textElement as IElement;
element.Geometry = polygon as IGeometry;
graphicsContainer.DeleteAllElements();
graphicsContainer.AddElement(element, 0);
((IActiveView)this._context.FocusMap).PartialRefresh(esriViewDrawPhase.esriViewGraphics,
null, null);
}
this._polygonFeedback = null;
this._pointCollection = null;
((IActiveView)this._context.FocusMap).Refresh();
break;
}
}
}
}