/// <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)); }
}
}
/// <summary>
/// Get picked geometry from a <see cref="PickableNode"/> with <see cref="ZeroIndexBuffer"/> as index buffer.
/// </summary>
/// <param name="node"></param>
public ZeroIndexPicker(PickableNode node) : base(node)
{
}
/// <summary>
/// Get picked geometry from a <see cref="PickableNode"/> with <see cref="DrawArraysCmd"/> as index buffer.
/// </summary>
/// <param name="node"></param>
/// <param name="positionBuffer"></param>
/// <param name="drawCommand"></param>
public DrawElementsPicker(PickableNode node, VertexBuffer positionBuffer, DrawElementsCmd drawCommand)
: base(node, positionBuffer)
{
this.DrawCommand = drawCommand;
}
/// <summary>
/// Get picked geometry from a <see cref="PickableNode"/> with <see cref="ZeroIndexBuffer"/> as index buffer.
/// </summary>
/// <param name="node"></param>
public OneIndexPicker(PickableNode node) : base(node)
{
}
/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="stageVertexId"></param>
/// <returns></returns>
public override PickedGeometry GetPickedGeometry(PickingEventArgs arg, uint stageVertexId)
{
PickableNode node = this.Renderer;
uint lastVertexId;
if (!node.GetLastVertexIdOfPickedGeometry(stageVertexId, out lastVertexId))
{
return(null);
}
// 找到 lastIndexId
RecognizedPrimitiveInfo lastIndexId = this.GetLastIndexIdOfPickedGeometry(
arg, lastVertexId);
if (lastIndexId == null)
{
Debug.WriteLine(string.Format(
"Got lastVertexId[{0}] but no lastIndexId! Params are [{1}] [{2}]",
lastVertexId, arg, stageVertexId));
{ return(null); }
}
PickingGeometryTypes geometryType = arg.GeometryType;
DrawMode drawMode = node.PickingRenderUnit.VertexArrayObject.IndexBuffer.Mode;
GeometryType typeOfMode = drawMode.ToGeometryType();
if ((geometryType & PickingGeometryTypes.Point) == PickingGeometryTypes.Point)
{
// 获取pickedGeometry
if (typeOfMode == GeometryType.Point)
{
return(PickWhateverItIs(arg, stageVertexId, lastIndexId, typeOfMode));
}
else if (typeOfMode == GeometryType.Line)
{
if (this.OnPrimitiveTest(lastVertexId, drawMode))
{
return(PickPoint(arg, stageVertexId, lastVertexId));
}
else
{
return(null);
}
}
else
{
OneIndexPointSearcher searcher = GetPointSearcher(drawMode);
if (searcher != null)// line is from triangle, quad or polygon
{
return(SearchPoint(arg, stageVertexId, lastVertexId, lastIndexId, 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, lastIndexId, typeOfMode));
}
else
{
OneIndexLineSearcher searcher = GetLineSearcher(drawMode);
if (searcher != null)// line is from triangle, quad or polygon
{
return(SearchLine(arg, stageVertexId, lastIndexId, 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, lastIndexId, typeOfMode));
}
else
{
return(null);
}
//{ throw new Exception(string.Format("Lack of searcher for [{0}]", mode)); }
}
}
/// <summary>
/// Get picked geometry.
/// </summary>
/// <param name="node"></param>
public PickerBase(PickableNode node)
{
this.Renderer = node;
}
/// <summary>
/// Get picked geometry.
/// </summary>
/// <param name="node"></param>
/// <param name="positionBuffer"></param>
public PickerBase(PickableNode node, VertexBuffer positionBuffer)
{
this.Node = node;
this.PositionBuffer = positionBuffer;
}
/// <summary>
/// Get picked geometry.
/// </summary>
/// <param name="node"></param>
public PickerBase(PickableNode node)
{
this.Node = node;
}
/// <summary>
/// Get picked geometry from a <see cref="PickableNode"/> with <see cref="DrawArraysCmd"/> as index buffer.
/// </summary>
/// <param name="node"></param>
/// <param name="positionBuffer"></param>
/// <param name="drawCommand"></param>
public DrawElementsPicker(PickableNode node, VertexBuffer positionBuffer, IDrawCommand drawCommand) : base(node, positionBuffer, drawCommand)
{
}
/// <summary>
/// Get picked geometry.
/// </summary>
/// <param name="node"></param>
/// <param name="positionBuffer"></param>
/// <param name="drawCommand"></param>
public PickerBase(PickableNode node, VertexBuffer positionBuffer, IDrawCommand drawCommand)
{
this.Node = node;
this.PositionBuffer = positionBuffer;
this.DrawCommand = drawCommand;
}
