/// <summary>
/// Select graphics by an extent
/// </summary>
/// <param name="aExtent">extent</param>
/// <param name="selectedGraphics">ref selected graphics</param>
/// <returns>if selected</returns>
public bool SelectGraphics(Extent aExtent, ref GraphicCollection selectedGraphics)
{
selectedGraphics.GraphicList.Clear();
int i, j;
PointD aPoint = new PointD();
aPoint.X = (aExtent.minX + aExtent.maxX) / 2;
aPoint.Y = (aExtent.minY + aExtent.maxY) / 2;
foreach (Graphic aGraphic in _graphicList)
{
switch (aGraphic.Shape.ShapeType)
{
case ShapeTypes.Point:
for (i = 0; i < Count; i++)
{
PointShape aPS = (PointShape)_graphicList[i].Shape;
if (MIMath.PointInExtent(aPS.Point, aExtent))
{
selectedGraphics.Add(aGraphic);
}
}
break;
case ShapeTypes.Polyline:
case ShapeTypes.PolylineZ:
for (i = 0; i < Count; i++)
{
PolylineShape aPLS = (PolylineShape)_graphicList[i].Shape;
if (MIMath.IsExtentCross(aExtent, aPLS.Extent))
{
for (j = 0; j < aPLS.Points.Count; j++)
{
aPoint = aPLS.Points[j];
if (MIMath.PointInExtent(aPoint, aExtent))
{
selectedGraphics.Add(aGraphic);
break;
}
}
}
}
break;
case ShapeTypes.Polygon:
case ShapeTypes.Rectangle:
for (i = Count - 1; i >= 0; i--)
{
PolygonShape aPGS = (PolygonShape)_graphicList[i].Shape;
if (!(aPGS.PartNum > 1))
{
if (MIMath.PointInPolygon(aPGS.Points, aPoint))
{
selectedGraphics.Add(aGraphic);
}
}
else
{
for (int p = 0; p < aPGS.PartNum; p++)
{
ArrayList pList = new ArrayList();
if (p == aPGS.PartNum - 1)
{
for (int pp = aPGS.parts[p]; pp < aPGS.PointNum; pp++)
{
pList.Add(aPGS.Points[pp]);
}
}
else
{
for (int pp = aPGS.parts[p]; pp < aPGS.parts[p + 1]; pp++)
{
pList.Add(aPGS.Points[pp]);
}
}
if (MIMath.PointInPolygon(pList, aPoint))
{
selectedGraphics.Add(aGraphic);
break;
}
}
}
}
break;
}
}
if (selectedGraphics.Count > 0)
{
return(true);
}
else
{
return(false);
}
}