/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="stageVertexId">The last vertex's id that constructs the picked primitive.
/// <para>This id is in scene's all <see cref="IPickable"/>s' order.</para></param>
/// <param name="baseId">Index of first vertex of the buffer that The geometry belongs to.
/// <para>This id is in scene's all <see cref="IPickable"/>s' order.</para></param>
/// <returns></returns>
public override PickedGeometry GetPickedGeometry(PickingEventArgs arg, uint stageVertexId, uint baseId)
{
if (stageVertexId < baseId)
{
return(null);
}
uint singleNodeVertexId = stageVertexId - baseId;
if (this.PositionBuffer.Length <= singleNodeVertexId)
{
return(null);
}
PickableNode node = this.Node;
// Find primitiveInfo
RecognizedPrimitiveInfo primitiveInfo = this.GetPrimitiveInfoOfPickedGeometry(arg, singleNodeVertexId, baseId);
if (primitiveInfo == null)
{
Debug.WriteLine(string.Format(
"Got singleNodeVertexId[{0}] but no primitiveInfo! Params are [{1}] [{2}]",
singleNodeVertexId, arg, stageVertexId));
{ return(null); }
}
PickingGeometryTypes geometryType = arg.GeometryType;
DrawMode drawMode = this.DrawCommand.CurrentMode;
GeometryType typeOfMode = drawMode.ToGeometryType();
if ((geometryType & PickingGeometryTypes.Point) == PickingGeometryTypes.Point)
{
// 获取pickedGeometry
if (typeOfMode == GeometryType.Point)
{
return(PickWhateverItIs(arg, stageVertexId, primitiveInfo, typeOfMode));
}
else
{
DrawElementsPointSearcher searcher = GetPointSearcher(drawMode);
if (searcher != null)// line is from triangle, quad or polygon
{
return(SearchPoint(arg, singleNodeVertexId, stageVertexId, primitiveInfo, searcher));
}
else
{
throw new Exception(string.Format("Lack of searcher for [{0}]", drawMode));
}
}
}
else if ((geometryType & PickingGeometryTypes.Line) == PickingGeometryTypes.Line)
{
// 获取pickedGeometry
if (typeOfMode == GeometryType.Point) // want a line when rendering GL_POINTS
{
return(null);
}
if (typeOfMode == GeometryType.Line)
{
return(PickWhateverItIs(arg, stageVertexId, primitiveInfo, typeOfMode));
}
else
{
DrawElementsLineSearcher searcher = GetLineSearcher(drawMode);
if (searcher != null)// line is from triangle, quad or polygon
{
return(SearchLine(arg, singleNodeVertexId, stageVertexId, primitiveInfo, searcher));
}
else
{
throw new Exception(string.Format("Lack of searcher for [{0}]", drawMode));
}
}
}
else
{
if (geometryType.Contains(typeOfMode)) // I want what it is
{
return(PickWhateverItIs(arg, stageVertexId, primitiveInfo, typeOfMode));
}
else
{
return(null);
}
//{ throw new Exception(string.Format("Lack of searcher for [{0}]", mode)); }
}
}
private static DrawElementsPointSearcher GetPointSearcher(DrawMode mode)
{
DrawElementsPointSearcher result = null;
switch (mode)
{
case DrawMode.Points:
break;
case DrawMode.Lines:
result = pointInLine;
break;
case DrawMode.LineLoop:
result = pointInLine;
break;
case DrawMode.LineStrip:
result = pointInLine;
break;
case DrawMode.Triangles:
result = pointInTriangle;
break;
case DrawMode.TriangleStrip:
result = pointInTriangle;
break;
case DrawMode.TriangleFan:
result = pointInTriangle;
break;
case DrawMode.Quads:
result = pointInQuad;
break;
case DrawMode.QuadStrip:
result = pointInQuad;
break;
case DrawMode.Polygon:
result = pointInPolygon;
break;
case DrawMode.LinesAdjacency:
result = pointInLine;
break;
case DrawMode.LineStripAdjacency:
result = pointInLine;
break;
case DrawMode.TrianglesAdjacency:
result = pointInTriangle;
break;
case DrawMode.TriangleStripAdjacency:
result = pointInTriangle;
break;
case DrawMode.Patches:
break;
default:
throw new NotDealWithNewEnumItemException(typeof(DrawMode));
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="stageVertexId"></param>
/// <param name="singleNodeVertexId"></param>
/// <param name="primitiveInfo"></param>
/// <param name="searcher"></param>
/// <returns></returns>
private PickedGeometry SearchPoint(PickingEventArgs arg, uint singleNodeVertexId, uint stageVertexId, RecognizedPrimitiveInfo primitiveInfo, DrawElementsPointSearcher searcher)
{
uint id = searcher.Search(arg, primitiveInfo, singleNodeVertexId, stageVertexId, this);
if (id == uint.MaxValue)
{
return(null);
} // Scene's changed before second rendering for picking>
uint baseId = stageVertexId - singleNodeVertexId;
var vertexIds = new uint[] { (id - baseId) };
vec3[] positions = FillPickedGeometrysPosition(vertexIds);
var pickedGeometry = new PickedGeometry(GeometryType.Point, positions, vertexIds, stageVertexId, this.Node);
return(pickedGeometry);
}
/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="stageVertexId"></param>
/// <param name="lastVertexId"></param>
/// <param name="primitiveInfo"></param>
/// <param name="searcher"></param>
/// <returns></returns>
private PickedGeometry SearchPoint(PickingEventArgs arg, uint stageVertexId, uint lastVertexId, RecognizedPrimitiveInfo primitiveInfo, DrawElementsPointSearcher searcher)
{
var vertexIds = new uint[] { searcher.Search(arg, primitiveInfo, this), };
vec3[] positions = FillPickedGeometrysPosition(vertexIds);
var pickedGeometry = new PickedGeometry(GeometryType.Point, positions, vertexIds, stageVertexId, this.Node);
return(pickedGeometry);
}