IPickedGeometry IColorCodedPicking.Pick(uint stageVertexID)
{
IColorCodedPicking element = this as IColorCodedPicking;
PickedGeometryIndexed pickedGeometry = element.TryPick <PickedGeometryIndexed>(
PrimitiveModes.TriangleStrip, stageVertexID);
if (pickedGeometry == null)
{
return(null);
}
// Fill primitive's positions and colors. This maybe changes much more than lines above in second dev.
uint lastVertexID;
if (element.GetLastVertexIDOfPickedGeometry(stageVertexID, out lastVertexID))
{
pickedGeometry.CubeIndex = lastVertexID / 8;
var vertexIndex = lastVertexID % 8;
pickedGeometry.positions = new vec3[1] {
unitCubePos[vertexIndex]
};
}
return(pickedGeometry);
}
/// <summary>
/// Get the primitive of <paramref name="element"/> according to vertex's id.
/// <para>Returns <code>null</code> if <paramref name="element"/> is null or <paramref name="stageVertexID"/> does not belong to any of this <paramref name="element"/>'s vertices.</para>
/// <para>Note: the <paramref name="stageVertexID"/> refers to the last vertex that constructs the primitive. And it's unique in scene's all elements.</para>
/// </summary>
/// <typeparam name="T">Subclass of <see cref="IPickedGeometry"/></typeparam>
/// <param name="element">the scene's element that contains the primitive.</param>
/// <param name="mode">specifies what type of primitive it is.</param>
/// <param name="stageVertexID">Refers to the last vertex that constructs the primitive. And it's unique in scene's all elements.</param>
/// <param name="positions">element's vertices' position array.</param>
/// <returns></returns>
public static T TryPick <T>(
this IColorCodedPicking element, PrimitiveModes mode, uint stageVertexID, float[] positions)
where T : IPickedGeometry, new()
{
if (positions == null)
{
throw new ArgumentNullException("positions");
}
T pickedGeometry = element.TryPick <T>(mode, stageVertexID);
// Fill primitive's positions and colors. This maybe changes much more than lines above in second dev.
if (pickedGeometry != null)
{
uint lastVertexID;
if (element.GetLastVertexIDOfPickedGeometry(stageVertexID, out lastVertexID))
{
int vertexCount = pickedGeometry.GeometryType.GetVertexCount();
if (vertexCount == -1)
{
vertexCount = positions.Length / 3;
}
float[] geometryPositions = new float[vertexCount * 3];
uint i = lastVertexID * 3 + 2;
for (int j = (geometryPositions.Length - 1); j >= 0; i--, j--)
{
if (i == uint.MaxValue)// This is when mode is GL_LINE_LOOP.
{
i = (uint)positions.Length - 1;
}
geometryPositions[j] = positions[i];
}
var poss = new vec3[vertexCount];
for (int t = 0; t < vertexCount; t++)
{
poss[t] = new vec3(geometryPositions[t * 3 + 0], geometryPositions[t * 3 + 1], geometryPositions[t * 3 + 2]);
}
pickedGeometry.positions = poss;
}
}
return(pickedGeometry);
}
IPickedGeometry IColorCodedPicking.Pick(uint stageVertexID)
{
IColorCodedPicking element = this as IColorCodedPicking;
PickedGeometryColored pickedGeometry = element.TryPick <PickedGeometryColored>(
this.Model.Mode, stageVertexID, this.Model.Positions);
if (pickedGeometry == null)
{
return(null);
}
// Fill primitive's positions and colors. This maybe changes much more than lines above in second dev.
uint lastVertexID;
if (element.GetLastVertexIDOfPickedGeometry(stageVertexID, out lastVertexID))
{
ScientificModel model = this.Model;
int vertexCount = pickedGeometry.GeometryType.GetVertexCount();
if (vertexCount == -1)
{
vertexCount = model.VertexCount;
}
float[] geometryColors = new float[vertexCount * 3];
float[] modelColors = model.Colors;
uint i = lastVertexID * 3 + 2;
for (int j = (geometryColors.Length - 1); j >= 0; i--, j--)
{
if (i == uint.MaxValue)// This is when mode is GL_LINE_LOOP.
{
i = (uint)modelColors.Length - 1;
}
geometryColors[j] = modelColors[i];
}
pickedGeometry.colors = geometryColors;
}
return(pickedGeometry);
}