public Vector3 GetElementPositionWithoutColliding(ICircleElement element, Vector3 oldPosition, Vector3 newPosition)
{
var allButMe = decoSpaceIndex.GetElements(newPosition).Where(e => e != element).ToList();
newPosition = allButMe.Aggregate(newPosition, (current, circleElement) => PushPositionAway(current, element.CircleElementProperties.Radius, (ICircleElement)circleElement));
return(!CanMoveWithoutCollision(element, newPosition) ? oldPosition : newPosition); //If still collision after correction => Don't move
}
public bool MoveDetectCollision(ICircleElement element, Vector3 previousPosition, Vector3 Position)
{
var oldBasePosition = decoSpaceIndex.GetBasePosition(previousPosition);
var newBasePosition = decoSpaceIndex.GetBasePosition(Position);
if (oldBasePosition != newBasePosition)
{
decoSpaceIndex.MoveElementBetweenChunks(element, oldBasePosition, newBasePosition);
}
return(decoSpaceIndex.GetElements(Position).Any(e => collide((ICircleElement)e, element, Position)));
}
public Vector3 PushPositionAway(Vector3 Position, float radius, ICircleElement other)
{
if (radius == 0f || other.CircleElementProperties.Radius == 0f)
{
return(Position);
}
var otherRad = other.CircleElementProperties.Radius;
var distance = Position - other.IndexPosition;
var sqrMagnitude = distance.sqrMagnitude;
var totalRadius = otherRad + radius;
if (sqrMagnitude > totalRadius * totalRadius)
{
return(Position);
}
return(other.IndexPosition + (totalRadius + 0.01f) * distance.normalized);
}
private bool collide(ICircleElement a, ICircleElement b, Vector3 bPosition)
{
if (a == b)
{
return(false);
}
if (a.CircleElementProperties == null)
{
return(false);
}
if (b.CircleElementProperties == null)
{
return(false);
}
if (a.CircleElementProperties.Radius == 0f || b.CircleElementProperties.Radius == 0f)
{
return(false);
}
return((a.IndexPosition - bPosition).sqrMagnitude < (a.CircleElementProperties.Radius + b.CircleElementProperties.Radius) * (a.CircleElementProperties.Radius + b.CircleElementProperties.Radius));
}
/// <summary>
/// 添加图元
/// </summary>
/// <param name="pGeometry"></param>
/// <param name="pActiveView"></param>
/// <param name="pSymbol"></param>
/// <param name="key"></param>
/// <returns></returns>
public IElement AddElement(IGeometry pGeometry, ISymbol pSymbol, string key)
{
try
{
IActiveView pActiveView = mapControl.ActiveView;
IGraphicsContainer pGraphicsContainer = pActiveView.GraphicsContainer;
IElement pElement = null;
ILineElement pLineElement = null;
IFillShapeElement pFillShapeElement = null;
IMarkerElement pMarkerElement = null;
ICircleElement pCircleElement = null;
IElementProperties pElmentProperties = null;
switch (pGeometry.GeometryType)
{
case esriGeometryType.esriGeometryEnvelope:
{
pElement = new RectangleElement();
pElement.Geometry = pGeometry;
pFillShapeElement = (IFillShapeElement)pElement;
pFillShapeElement.Symbol = (IFillSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryPolyline:
{
pElement = new LineElement();
pElement.Geometry = pGeometry;
pLineElement = (ILineElement)pElement;
pLineElement.Symbol = (ILineSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryLine:
{
pElement = new LineElement();
pElement.Geometry = pGeometry;
pLineElement = (ILineElement)pElement;
pLineElement.Symbol = (ILineSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryPolygon:
{
pElement = new PolygonElement();
pElement.Geometry = pGeometry;
pFillShapeElement = (IFillShapeElement)pElement;
pFillShapeElement.Symbol = (IFillSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryMultipoint:
case esriGeometryType.esriGeometryPoint:
{
pElement = new MarkerElement();
pElement.Geometry = pGeometry;
pMarkerElement = (IMarkerElement)pElement;
pMarkerElement.Symbol = (IMarkerSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryCircularArc:
{
pElement = new CircleElement();
pElement.Geometry = pGeometry;
pCircleElement = (ICircleElement)pElement;
break;
}
default:
pElement = null;
break;
}
if (pElement != null)
{
pElmentProperties = pElement as IElementProperties;
pElmentProperties.Name = key;
pGraphicsContainer.AddElement(pElement, 0);
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, pGeometry.Envelope);
return(pElement);
}
else
{
return(null);
}
}
catch (Exception ex)
{
return(null);
}
}
public void Move(ICircleElement element, Vector3 Position)
{
decoSpaceIndex.Move(element, Position);
}
public List <ICircleElement> GetColliders(ICircleElement element, Vector3 Position)
{
return(decoSpaceIndex.GetElements(Position).Where(e => collide((ICircleElement)e, element, Position)).Select(e => (ICircleElement)e).ToList());
}
public bool CanMoveWithoutCollision(ICircleElement element, Vector3 Position)
{
return(!decoSpaceIndex.GetElements(Position).Any(e => collide((ICircleElement)e, element, Position)));
}