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//---------------------------------------------------------------------------
//
// <copyright file="Viewport2DVisual3D.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description:
//
// History:
// 4/12/2007: kurtb - Created
//
//---------------------------------------------------------------------------
using MS.Utility;
using MS.Internal;
using MS.Internal.Media;
using MS.Internal.Media3D;
using MS.Internal.PresentationCore;
using MS.Internal.KnownBoxes;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Windows;
using System.Windows.Media.Composition;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Documents;
using System.Collections;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media.Media3D
{
/// <summary>
/// The Viewport2DVisual3D class represents the link from 3D back to 2D, just as
/// Viewport3DVisual represents the link from 2D in to 3D.
/// </summary>
[ContentProperty("Visual")]
public sealed class Viewport2DVisual3D : Visual3D
{
/// <summary>
/// Constructs a new Viewport2DVisual3D
/// </summary>
public Viewport2DVisual3D()
{
_visualBrush = CreateVisualBrush();
_bitmapCacheBrush = CreateBitmapCacheBrush();
// create holders for the content
// We don't want this model to set itself as the IC for Geometry and Material
// so we set to to not be able to be an inheritance context.
GeometryModel3D model = new GeometryModel3D();
model.CanBeInheritanceContext = false;
Visual3DModel = model;
}
internal static bool Get3DPointFor2DCoordinate(Point point,
out Point3D point3D,
Point3DCollection positions,
PointCollection textureCoords,
Int32Collection triIndices)
{
point3D = new Point3D();
// walk through the triangles - and look for the triangles we care about
Point3D[] p = new Point3D[3];
Point[] uv = new Point[3];
if (positions != null && textureCoords != null)
{
if (triIndices == null || triIndices.Count == 0)
{
int texCoordCount = textureCoords.Count;
// in this case we have a non-indexed mesh
int count = positions.Count;
count = count - (count % 3);
for (int i = 0; i < count; i+=3)
{
for (int j = 0; j < 3; j++)
{
p[j] = positions[i + j];
if (i + j < texCoordCount)
{
uv[j] = textureCoords[i + j];
}
else
{
// In the case you have less texture coordinates than positions, MIL will set
// missing ones to be 0,0. We do the same to stay consistent.
// See CMILMesh3D::CopyTextureCoordinatesFromDoubles
uv[j] = new Point(0, 0);
}
}
if (M3DUtil.IsPointInTriangle(point, uv, p, out point3D))
{
return true;
}
}
}
else
{
// in this case we have an indexed mesh
int posLimit = positions.Count;
int texCoordLimit = textureCoords.Count;
for (int i = 2, count=triIndices.Count; i < count; i += 3)
{
bool validTextureCoordinates = true;
for (int j = 0; j < 3; j++)
{
// subtract 2 to take in to account we start i
// at the high range of indices
int index = triIndices[(i-2) + j];
// if a point or texture coordinate is out of range, end early since this is an error
if (index < 0 || index >= posLimit)
{
// no need to look anymore - see MeshGeometry3D RayHitTestIndexedList for
// reasoning why we stop
return false;
}
if (index < 0 || index >= texCoordLimit)
{
validTextureCoordinates = false;
break;
}
p[j] = positions[index];
uv[j] = textureCoords[index];
}
if (validTextureCoordinates)
{
if (M3DUtil.IsPointInTriangle(point, uv, p, out point3D))
{
return true;
}
}
}
}
}
return false;
}
/// <summary>
/// Converts a point given in texture coordinates to the corresponding
/// 2D point on the UIElement passed in.
/// </summary>
/// <param name="uv">The texture coordinate to convert</param>
/// <param name="visual">The UIElement whose coordinate system is to be used</param>
/// <returns>
/// The 2D point on the passed in UIElement cooresponding to the
/// passed in texture coordinate.
/// </returns>
internal static Point TextureCoordsToVisualCoords(Point uv, Visual visual)
{
return TextureCoordsToVisualCoords(uv, visual.CalculateSubgraphRenderBoundsOuterSpace());
}
// same as the above except we now take the rectangle giving the bounds of the visual
// rather than the visual itself
internal static Point TextureCoordsToVisualCoords(Point uv, Rect descBounds)
{
return new Point(uv.X * descBounds.Width + descBounds.Left,
uv.Y * descBounds.Height + descBounds.Top);
}
/// <summary>
/// Returns true and the intersection point for the given rayHitResult if there is an intersection,
/// and false otherwise.
/// </summary>
/// <param name="rayHitResult"></param>
/// <param name="outputPoint">The output point if there was an intersection</param>
/// <returns>
/// Returns the point of intersection in outputPoint if there is one, and returns true
/// to indicate this.
/// </returns>
internal static bool GetIntersectionInfo(RayHitTestResult rayHitResult, out Point outputPoint)
{
bool success = false;
outputPoint = new Point();
// try to cast to a RaymeshGeometry3DHitTestResult
RayMeshGeometry3DHitTestResult rayMeshResult = rayHitResult as RayMeshGeometry3DHitTestResult;
if (rayMeshResult != null)
{
// we can now extract the mesh and visual for the object we hit
MeshGeometry3D geom = rayMeshResult.MeshHit;
// pull the barycentric coordinates of the intersection point
double vertexWeight1 = rayMeshResult.VertexWeight1;
double vertexWeight2 = rayMeshResult.VertexWeight2;
double vertexWeight3 = rayMeshResult.VertexWeight3;
// the indices in to where the actual intersection occurred
int index1 = rayMeshResult.VertexIndex1;
int index2 = rayMeshResult.VertexIndex2;
int index3 = rayMeshResult.VertexIndex3;
PointCollection textureCoordinates = geom.TextureCoordinates;
// texture coordinates of the three vertices hit
// in the case that no texture coordinates are supplied we will simply
// treat it as if no intersection occurred
if (textureCoordinates != null &&
index1 < textureCoordinates.Count &&
index2 < textureCoordinates.Count &&
index3 < textureCoordinates.Count)
{
Point texCoord1 = textureCoordinates[index1];
Point texCoord2 = textureCoordinates[index2];
Point texCoord3 = textureCoordinates[index3];
// get the final uv values based on the barycentric coordinates
outputPoint = new Point(texCoord1.X * vertexWeight1 +
texCoord2.X * vertexWeight2 +
texCoord3.X * vertexWeight3,
texCoord1.Y * vertexWeight1 +
texCoord2.Y * vertexWeight2 +
texCoord3.Y * vertexWeight3);
success = true;
}
}
return success;
}
/// <summary>
/// Converts a point on the passed in UIElement to the corresponding
/// texture coordinate for that point. The function assumes (0, 0)
/// is the upper-left texture coordinate and (1,1) is the lower-right.
/// </summary>
/// <param name="pt">The 2D point on the passed in UIElement to convert</param>
/// <param name="visual">The UIElement whose coordinate system is being used</param>
/// <returns>
/// The texture coordinate corresponding to the 2D point on the passed in UIElement
/// </returns>
internal static Point VisualCoordsToTextureCoords(Point pt, Visual visual)
{
return VisualCoordsToTextureCoords(pt, visual.CalculateSubgraphRenderBoundsOuterSpace());
}
// same as the above except we now take the rectangle giving the bounds of the visual
// rather than the visual itself
internal static Point VisualCoordsToTextureCoords(Point pt, Rect descBounds)
{
return new Point((pt.X - descBounds.Left) / (descBounds.Right - descBounds.Left),
(pt.Y - descBounds.Top) / (descBounds.Bottom - descBounds.Top));
}
/// <summary>
/// GenerateMaterial creates the material for the InteractiveModelVisual3D. The
/// material is composed of the Visual, which is displayed on a VisualBrush on a
/// DiffuseMaterial, as well as any post materials which are also applied.
/// </summary>
private void GenerateMaterial()
{
Material material = Material;
// We clone the material so that we can modify parts of it without affecting the
// original material that it came from.
if (material != null)
{
material = material.CloneCurrentValue();
}
((GeometryModel3D)Visual3DModel).Material = material;
if (material != null)
{
SwapInCyclicBrush(material);
}
}
/// <summary>
/// The visual applied to the VisualBrush, which is then used on the 3D object.
///
/// We AddOwner this property to get the same special treatment as VisualBrush's VisualProperty
/// gets in InheritanceContext linkups and because both properties are used to describe the
/// Visual content of the owner.
///
/// </summary>
public static readonly DependencyProperty VisualProperty =
VisualBrush.VisualProperty.AddOwner(
typeof(Viewport2DVisual3D),
new PropertyMetadata(null, new PropertyChangedCallback(OnVisualChanged)));
/// <summary>
/// </summary>
public Visual Visual
{
get { return (Visual)GetValue(VisualProperty); }
set { SetValue(VisualProperty, value); }
}
/// <summary>
/// The visual brush that the internal visual is contained on.
/// </summary>
private VisualBrush InternalVisualBrush
{
get { return _visualBrush; }
set { _visualBrush = value; }
}
private BitmapCacheBrush InternalBitmapCacheBrush
{
get { return _bitmapCacheBrush; }
set { _bitmapCacheBrush = value; }
}
internal static void OnVisualChanged(Object sender, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2DVisual3D = ((Viewport2DVisual3D)sender);
// remove the old parent, add on a new one
Visual oldValue = (Visual)e.OldValue;
Visual newValue = (Visual)e.NewValue;
if (oldValue != newValue)
{
//
// The following code deals with properly setting up the new child to have its inheritance context
// only point towards this Viewport2DVisual3D.
//
// When we add the new visual as a child, if that visual is an FE (which most will be) we expect it to
// clear the inheritance context (IC) since it has a visual parent. In the case of a non-FE they don't
// deal with ICs anyway, so they should have a null IC. The Assert that follows then guards against
// the child not having a null inheritance context.
//
// We then set the target Visual on the internal brush to be this new visual. Since when we created
// the brush we set it to not be an inheritance context, the InheritanceContext should still be null.
//
// We become the IC after returning from this function, since the function that calls this change handler
// will set us as the IC.
//
if (viewport2DVisual3D.CacheMode as BitmapCache != null)
{
viewport2DVisual3D.InternalBitmapCacheBrush.Target = newValue;
Debug.Assert((newValue == null || newValue.InheritanceContext == null),
"Expected BitmapCacheBrush to remove the InheritanceContext on newValue");
}
else
{
// Add ourselves as the parent of the object
viewport2DVisual3D.RemoveVisualChild(oldValue);
viewport2DVisual3D.AddVisualChild(newValue);
Debug.Assert((newValue == null || newValue.InheritanceContext == null),
"Expected AddVisualChild to remove the InheritanceContext on newValue");
// Change the brush's target
viewport2DVisual3D.InternalVisualBrush.Visual = newValue;
// setting the visual brush to use this new child should not invalidate our previous condition
Debug.Assert((newValue == null || newValue.InheritanceContext == null),
"Expected the InternalVisualBrush not to set the InheritanceContext");
}
}
}
/// <summary>
/// AttachChild
///
/// This method is called to add a 2D Visual child to the Viewport2DVisual3D
///
/// </summary>
private void AddVisualChild(Visual child)
{
if (child == null)
{
return;
}
if (child._parent != null)
{
throw new ArgumentException(SR.Get(SRID.Visual_HasParent));
}
// Set the parent pointer.
child._parent = this;
// NOTE: Since the 2D object is on a VisualBrush, it will allow it to handle
// the dirtyness of the 2D object, realization information, as well as layout. See
// Visual(3D).AddVisualChild for the things they propagate on adding a new child
// Fire notifications
this.OnVisualChildrenChanged(child, null /* no removed child */);
child.FireOnVisualParentChanged(null);
}
/// <summary>
/// DisconnectChild
///
/// This method is called to remove the 2D visual child of the Viewport2DVisual3D
///
/// </summary>
private void RemoveVisualChild(Visual child)
{
if (child == null || child._parent == null)
{
return;
}
if (child._parent != this)
{
throw new ArgumentException(SR.Get(SRID.Visual_NotChild));
}
// NOTE: We'll let the VisualBrush handle final cleanup from the channel
//
child._parent = null;
// NOTE: We also let the VisualBrush handle any flag propagation issues (so Visual(3D).RemoveVisualChild for
// the things they propagate) as well as layout.
// Fire notifications
child.FireOnVisualParentChanged(this);
OnVisualChildrenChanged(null /* no child added */, child);
}
/// <summary>
/// Creates the VisualBrush that will be used to hold the interactive
/// 2D content.
/// </summary>
/// <returns>The VisualBrush to hold the interactive 2D content</returns>
private VisualBrush CreateVisualBrush()
{
VisualBrush vb = new VisualBrush();
// We don't want the VisualBrush being the InheritanceContext for the Visual it contains. Rather we want
// that to be the Viewport2DVisual3D itself.
vb.CanBeInheritanceContext = false;
vb.ViewportUnits = BrushMappingMode.Absolute;
vb.TileMode = TileMode.None;
// set any rendering options in the visual brush - we do this to still give access to these caching hints
// without exposing the visual brush
RenderOptions.SetCachingHint(vb, (CachingHint)GetValue(CachingHintProperty));
RenderOptions.SetCacheInvalidationThresholdMinimum(vb, (double)GetValue(CacheInvalidationThresholdMinimumProperty));
RenderOptions.SetCacheInvalidationThresholdMaximum(vb, (double)GetValue(CacheInvalidationThresholdMaximumProperty));
return vb;
}
/// <summary>
/// Creates the BitmapCacheBrush that will be used to hold the interactive
/// 2D content.
/// </summary>
/// <returns>The BitmapCacheBrush to hold the interactive 2D content</returns>
private BitmapCacheBrush CreateBitmapCacheBrush()
{
BitmapCacheBrush bcb = new BitmapCacheBrush();
// We don't want the cache brush being the InheritanceContext for the Visual it contains. Rather we want
// that to be the Viewport2DVisual3D itself.
bcb.CanBeInheritanceContext = false;
// Ensure that the brush supports rendering all properties on the Visual to match VisualBrush behavior.
bcb.AutoWrapTarget = true;
bcb.BitmapCache = CacheMode as BitmapCache;
return bcb;
}
/// <summary>
/// Replaces any instances of the sentinal brush with the internal brush
/// </summary>
/// <param name="material">The material to look through</param>
private void SwapInCyclicBrush(Material material)
{
int numMaterialsSwapped = 0;
Stack<Material> materialStack = new Stack<Material>();
materialStack.Push(material);
Brush internalBrush = (CacheMode as BitmapCache != null) ? (Brush)InternalBitmapCacheBrush : (Brush)InternalVisualBrush;
while (materialStack.Count > 0)
{
Material currMaterial = materialStack.Pop();
if (currMaterial is DiffuseMaterial)
{
DiffuseMaterial diffMaterial = (DiffuseMaterial)currMaterial;
if ((Boolean)diffMaterial.GetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty))
{
diffMaterial.Brush = internalBrush;
numMaterialsSwapped++;
}
}
else if (currMaterial is EmissiveMaterial)
{
EmissiveMaterial emmMaterial = (EmissiveMaterial)currMaterial;
if ((Boolean)emmMaterial.GetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty))
{
emmMaterial.Brush = internalBrush;
numMaterialsSwapped++;
}
}
else if (currMaterial is SpecularMaterial)
{
SpecularMaterial specMaterial = (SpecularMaterial)currMaterial;
if ((Boolean)specMaterial.GetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty))
{
specMaterial.Brush = internalBrush;
numMaterialsSwapped++;
}
}
else if (currMaterial is MaterialGroup)
{
MaterialGroup matGroup = (MaterialGroup)currMaterial;
// the IsVisualHostMaterialProperty should not be set on a MaterialGroup - verify that
if ((Boolean)matGroup.GetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty))
{
throw new ArgumentException(SR.Get(SRID.Viewport2DVisual3D_MaterialGroupIsInteractiveMaterial), "material");
}
// iterate over the children and put them on the stack of materials to modify
MaterialCollection children = matGroup.Children;
if (children != null)
{
for (int i=0, count = children.Count; i < count; i++)
{
Material m = children[i];
materialStack.Push(m);
}
}
}
else
{
Invariant.Assert(true, "Unexpected Material type encountered. V2DV3D handles DiffuseMaterial, EmissiveMaterial, SpecularMaterial, and MaterialGroup.");
}
}
// throw if there is more than 1 interactive material
if (numMaterialsSwapped > 1)
{
throw new ArgumentException(SR.Get(SRID.Viewport2DVisual3D_MultipleInteractiveMaterials), "material");
}
}
/// <summary>
/// The 3D geometry that the InteractiveModelVisual3D represents
/// </summary>
public static readonly DependencyProperty GeometryProperty =
DependencyProperty.Register(
"Geometry",
typeof(Geometry3D),
typeof(Viewport2DVisual3D),
new PropertyMetadata(null, new PropertyChangedCallback(OnGeometryChanged)));
/// <summary>
/// </summary>
public Geometry3D Geometry
{
get { return (Geometry3D)GetValue(GeometryProperty); }
set { SetValue(GeometryProperty, value); }
}
internal static void OnGeometryChanged(Object sender, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2DVisual3D = ((Viewport2DVisual3D)sender);
viewport2DVisual3D.InvalidateAllCachedValues();
if (!e.IsASubPropertyChange)
{
((GeometryModel3D)viewport2DVisual3D.Visual3DModel).Geometry = viewport2DVisual3D.Geometry;
}
}
private void InvalidateAllCachedValues()
{
// invalidate all of them
InternalPositionsCache = null;
InternalTextureCoordinatesCache = null;
InternalTriangleIndicesCache = null;
}
// the cache of frozen positions for use with the various transforms
internal Point3DCollection InternalPositionsCache
{
get
{
if (_positionsCache == null)
{
Debug.Assert(Geometry == null || Geometry is MeshGeometry3D);
MeshGeometry3D geometry = Geometry as MeshGeometry3D;
if (geometry != null)
{
_positionsCache = geometry.Positions;
if (_positionsCache != null)
{
_positionsCache = (Point3DCollection)_positionsCache.GetCurrentValueAsFrozen();
}
}
}
return _positionsCache;
}
set
{
_positionsCache = value;
}
}
// the cache of frozen internal texture coordinates
internal PointCollection InternalTextureCoordinatesCache
{
get
{
if (_textureCoordinatesCache == null)
{
Debug.Assert(Geometry == null || Geometry is MeshGeometry3D);
MeshGeometry3D geometry = Geometry as MeshGeometry3D;
if (geometry != null)
{
_textureCoordinatesCache= geometry.TextureCoordinates;
if (_textureCoordinatesCache != null)
{
_textureCoordinatesCache = (PointCollection)_textureCoordinatesCache.GetCurrentValueAsFrozen();
}
}
}
return _textureCoordinatesCache;
}
set
{
_textureCoordinatesCache = value;
}
}
// the cache of frozen internal triangle indices
internal Int32Collection InternalTriangleIndicesCache
{
get
{
if (_triangleIndicesCache== null)
{
Debug.Assert(Geometry == null || Geometry is MeshGeometry3D);
MeshGeometry3D geometry = Geometry as MeshGeometry3D;
if (geometry != null)
{
_triangleIndicesCache = geometry.TriangleIndices;
if (_triangleIndicesCache != null)
{
_triangleIndicesCache = (Int32Collection)_triangleIndicesCache.GetCurrentValueAsFrozen();
}
}
}
return _triangleIndicesCache;
}
set
{
_triangleIndicesCache = value;
}
}
/// <summary>
/// The material used to visually represent the Viewport2DVisual3D
/// </summary>
public static readonly DependencyProperty MaterialProperty =
DependencyProperty.Register("Material",
typeof(Material),
typeof(Viewport2DVisual3D),
new PropertyMetadata(null,
new PropertyChangedCallback(OnMaterialPropertyChanged)));
/// <summary>
/// Material for this Viewport2DVisual3D.
/// </summary>
public Material Material
{
get { return (Material)GetValue(MaterialProperty); }
set { SetValue(MaterialProperty, value); }
}
internal static void OnMaterialPropertyChanged(Object sender, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2DVisual3D = ((Viewport2DVisual3D)sender);
viewport2DVisual3D.GenerateMaterial();
}
/// <summary>
/// The attached dependency property used to indicate whether a material should be made
/// interactive.
/// </summary>
public static readonly DependencyProperty IsVisualHostMaterialProperty =
DependencyProperty.RegisterAttached(
"IsVisualHostMaterial",
typeof(Boolean),
typeof(Viewport2DVisual3D),
new PropertyMetadata(BooleanBoxes.FalseBox));
/// <summary>
/// Sets the attached property IsVisualHostMaterial for the given element.
/// </summary>
/// <param name="element">The element to which to write the IsVisualHostMaterial attached property.</param>
/// <param name="value">The value to set</param>
public static void SetIsVisualHostMaterial(Material element, Boolean value)
{
// [BreakingChange] Dev10 TFS Bug #453513
// We should throw ArgumentNullException if element is null.
element.SetValue(IsVisualHostMaterialProperty, BooleanBoxes.Box(value));
}
/// <summary>
/// Reads the attached property IsVisualHostMaterial from the given element.
/// </summary>
/// <param name="element">The element from which to read the IsVisualHostMaterial attached property.</param>
/// <returns>The property's value.</returns>
public static Boolean GetIsVisualHostMaterial(Material element)
{
// [BreakingChange] Dev10 TFS Bug #453513
// We should throw ArgumentNullException if element is null.
return (bool)element.GetValue(IsVisualHostMaterialProperty);
}
public static readonly DependencyProperty CacheModeProperty =
DependencyProperty.Register(
"CacheMode",
typeof(CacheMode),
typeof(Viewport2DVisual3D),
new PropertyMetadata(null, new PropertyChangedCallback(OnCacheModeChanged)));
public CacheMode CacheMode
{
get { return (CacheMode)GetValue(CacheModeProperty); }
set { SetValue(CacheModeProperty, value); }
}
internal static void OnCacheModeChanged(Object sender, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2DVisual3D = ((Viewport2DVisual3D)sender);
BitmapCache oldValue = (CacheMode)e.OldValue as BitmapCache;
BitmapCache newValue = (CacheMode)e.NewValue as BitmapCache;
if (oldValue != newValue)
{
viewport2DVisual3D.InternalBitmapCacheBrush.BitmapCache = newValue;
//
// The BitmapCacheBrush doesn't point directly at the Visual like the VisualBrush does,
// since BitmapCacheBrush ignores most properties on a Visual by design. In order for
// those properties to be respected to match the internal VisualBrush's behavior, we insert
// a dummy Visual node between the V2DV3D and its 2D Visual. We then target the dummy
// node with the brush instead.
//
if (oldValue == null)
{
//
// If we are swapping from using the VisualBrush to using the BitmapCacheBrush...
//
// Remove the visual child from the V2DV3D and add the dummy child.
viewport2DVisual3D.RemoveVisualChild(viewport2DVisual3D.Visual);
viewport2DVisual3D.AddVisualChild(viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget);
Debug.Assert( (viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget == null
|| viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget.InheritanceContext == null),
"Expected AddVisualChild to remove the InheritanceContext on InternalTarget");
// Swap the brush pointing to the visual. The cache brush will re-parent the visual to the dummy.
viewport2DVisual3D.InternalVisualBrush.Visual = null;
viewport2DVisual3D.InternalBitmapCacheBrush.Target = viewport2DVisual3D.Visual;
// setting the cache brush to use this new child should not invalidate our previous condition
Debug.Assert( (viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget == null
|| viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget.InheritanceContext == null),
"Expected the InternalBitmapCacheBrush not to set the InheritanceContext");
}
if (newValue == null)
{
//
// If we are swapping from using the BitmapCacheBrush to using the VisualBrush...
//
// Swap the brush pointing to the visual. The cache brush will remove the dummy as the parent
// of the visual.
viewport2DVisual3D.InternalBitmapCacheBrush.Target = null;
viewport2DVisual3D.InternalVisualBrush.Visual = viewport2DVisual3D.Visual;
// Remove the dummy child and re-add the visual as the V2DV3D's child.
viewport2DVisual3D.RemoveVisualChild(viewport2DVisual3D.InternalBitmapCacheBrush.InternalTarget);
viewport2DVisual3D.AddVisualChild(viewport2DVisual3D.Visual);
Debug.Assert((viewport2DVisual3D.Visual == null || viewport2DVisual3D.Visual.InheritanceContext == null),
"Expected AddVisualChild to remove the InheritanceContext on Visual");
}
// If we changed from using one brush to the other we need to regenerate the Material.
if (oldValue == null || newValue == null)
{
viewport2DVisual3D.GenerateMaterial();
}
}
}
/// <summary>
/// Derived classes override this property to enable the Visual code to enumerate
/// the Visual children. Derived classes need to return the number of children
/// from this method.
///
/// By default a Visual does not have any children.
///
/// Remark: During this virtual method the Visual tree must not be modified.
/// </summary>
protected override int Visual3DChildrenCount
{
get { return 0; }
}
/// <summary>
/// Derived class must implement to support Visual children. The method must return
/// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1.
///
/// By default a Visual3D does not have any children.
///
/// Remark:
/// Need to lock down Visual tree during the callbacks.
/// During this virtual call it is not valid to modify the Visual tree.
///
/// It is okay to type this protected API to the 2D Visual. The only 2D Visual with
/// 3D childern is the Viewport3DVisual which is sealed. -- Microsoft 01/17/06
/// </summary>
protected override Visual3D GetVisual3DChild(int index)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
/// <summary>
/// Returns the number of children of this object (in most cases this will be
/// the number of Visuals, but it some cases, Viewport3DVisual for instance,
/// this is the number of Visual3Ds).
///
/// Used only by VisualTreeHelper.
/// </summary>
internal override int InternalVisual2DOr3DChildrenCount
{
get
{
// Call the right virtual method.
return (Visual != null ? 1 : 0);
}
}
/// <summary>
/// Returns the child at index "index" (in most cases this will be
/// a Visual, but it some cases, Viewport3DVisual for instance,
/// this is a Visual3D).
///
/// Used only by VisualTreeHelper.
/// </summary>
internal override DependencyObject InternalGet2DOr3DVisualChild(int index)
{
Visual visualChild = Visual;
if (index != 0 || visualChild == null)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
return visualChild;
}
/// <summary>
/// CachingHintProperty - Hints the rendering engine that rendered content should be cached
/// when possible.
/// </summary>
private static readonly DependencyProperty CachingHintProperty =
RenderOptions.CachingHintProperty.AddOwner(
typeof(Viewport2DVisual3D),
new UIPropertyMetadata(
new PropertyChangedCallback(OnCachingHintChanged)));
private static void OnCachingHintChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2D = (Viewport2DVisual3D) d;
RenderOptions.SetCachingHint(viewport2D._visualBrush, (CachingHint)e.NewValue);
}
/// <summary>
/// CacheInvalidationThresholdMinimum -
/// </summary>
private static readonly DependencyProperty CacheInvalidationThresholdMinimumProperty =
RenderOptions.CacheInvalidationThresholdMinimumProperty.AddOwner(
typeof(Viewport2DVisual3D),
new UIPropertyMetadata(
new PropertyChangedCallback(OnCacheInvalidationThresholdMinimumChanged)));
private static void OnCacheInvalidationThresholdMinimumChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2D = (Viewport2DVisual3D) d;
RenderOptions.SetCacheInvalidationThresholdMinimum(viewport2D._visualBrush, (double)e.NewValue);
}
/// <summary>
/// CacheInvalidationThresholdMaximum -
/// </summary>
private static readonly DependencyProperty CacheInvalidationThresholdMaximumProperty =
RenderOptions.CacheInvalidationThresholdMaximumProperty.AddOwner(
typeof(Viewport2DVisual3D),
new UIPropertyMetadata(
new PropertyChangedCallback(OnCacheInvalidationThresholdMaximumChanged)));
private static void OnCacheInvalidationThresholdMaximumChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Viewport2DVisual3D viewport2D = (Viewport2DVisual3D) d;
RenderOptions.SetCacheInvalidationThresholdMaximum(viewport2D._visualBrush, (double)e.NewValue);
}
//------------------------------------------------------------------------
//
// PRIVATE DATA
//
//------------------------------------------------------------------------
// the actual visual that is created
private VisualBrush _visualBrush;
private BitmapCacheBrush _bitmapCacheBrush;
private Point3DCollection _positionsCache = null;
private PointCollection _textureCoordinatesCache = null;
private Int32Collection _triangleIndicesCache = null;
}
}
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