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//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2001
//
// File: LineGeometry.cs
//------------------------------------------------------------------------------
using System;
using MS.Internal;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using System.Collections;
using System.Text;
using System.Globalization;
using System.Windows.Media;
using System.Windows;
using System.Text.RegularExpressions;
using System.Windows.Media.Animation;
using System.Windows.Media.Composition;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media
{
/// <summary>
/// This is the Geometry class for Lines.
/// </summary>
public sealed partial class LineGeometry : Geometry
{
#region Constructors
/// <summary>
///
/// </summary>
public LineGeometry()
{
}
/// <summary>
///
/// </summary>
public LineGeometry(Point startPoint, Point endPoint)
{
StartPoint = startPoint;
EndPoint = endPoint;
}
/// <summary>
///
/// </summary>
public LineGeometry(
Point startPoint,
Point endPoint,
Transform transform) : this(startPoint, endPoint)
{
Transform = transform;
}
#endregion
/// <summary>
/// Gets the bounds of this Geometry as an axis-aligned bounding box
/// </summary>
public override Rect Bounds
{
get
{
ReadPreamble();
Rect rect = new Rect(StartPoint, EndPoint);
Transform transform = Transform;
if (transform != null && !transform.IsIdentity)
{
transform.TransformRect(ref rect);
}
return rect;
}
}
/// <summary>
/// Returns the axis-aligned bounding rectangle when stroked with a pen, after applying
/// the supplied transform (if non-null).
/// </summary>
internal override Rect GetBoundsInternal(Pen pen, Matrix worldMatrix, double tolerance, ToleranceType type)
{
Matrix geometryMatrix;
Transform.GetTransformValue(Transform, out geometryMatrix);
return LineGeometry.GetBoundsHelper(
pen,
worldMatrix,
StartPoint,
EndPoint,
geometryMatrix,
tolerance,
type);
}
/// <SecurityNote>
/// Critical - it calls a critical method, Geometry.GetBoundsHelper and has an unsafe block
/// TreatAsSafe - returning a LineGeometry's bounds is considered safe
/// </SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
internal static Rect GetBoundsHelper(Pen pen, Matrix worldMatrix, Point pt1, Point pt2,
Matrix geometryMatrix, double tolerance, ToleranceType type)
{
Debug.Assert(worldMatrix != null);
Debug.Assert(geometryMatrix != null);
if (pen == null && worldMatrix.IsIdentity && geometryMatrix.IsIdentity)
{
return new Rect(pt1, pt2);
}
else
{
unsafe
{
Point* pPoints = stackalloc Point[2];
pPoints[0] = pt1;
pPoints[1] = pt2;
fixed (byte *pTypes = LineGeometry.s_lineTypes)
{
return Geometry.GetBoundsHelper(
pen,
&worldMatrix,
pPoints,
pTypes,
c_pointCount,
c_segmentCount,
&geometryMatrix,
tolerance,
type,
false); // skip hollows - meaningless here, this is never a hollow
}
}
}
}
/// <SecurityNote>
/// Critical - contains unsafe block and calls critical method Geometry.ContainsInternal.
/// TreatAsSafe - as this doesn't expose anything sensitive.
/// </SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
internal override bool ContainsInternal(Pen pen, Point hitPoint, double tolerance, ToleranceType type)
{
unsafe
{
Point *pPoints = stackalloc Point[2];
pPoints[0] = StartPoint;
pPoints[1] = EndPoint;
fixed (byte* pTypes = GetTypeList())
{
return ContainsInternal(
pen,
hitPoint,
tolerance,
type,
pPoints,
GetPointCount(),
pTypes,
GetSegmentCount());
}
}
}
/// <summary>
/// Returns true if this geometry is empty
/// </summary>
public override bool IsEmpty()
{
return false;
}
/// <summary>
/// Returns true if this geometry may have curved segments
/// </summary>
public override bool MayHaveCurves()
{
return false;
}
/// <summary>
/// Gets the area of this geometry
/// </summary>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public override double GetArea(double tolerance, ToleranceType type)
{
return 0.0;
}
private byte[] GetTypeList() { return s_lineTypes; }
private static byte[] s_lineTypes = new byte[] { (byte)MILCoreSegFlags.SegTypeLine };
private uint GetPointCount() { return c_pointCount; }
private uint GetSegmentCount() { return c_segmentCount; }
/// <summary>
/// GetAsPathGeometry - return a PathGeometry version of this Geometry
/// </summary>
internal override PathGeometry GetAsPathGeometry()
{
PathStreamGeometryContext ctx = new PathStreamGeometryContext(FillRule.EvenOdd, Transform);
PathGeometry.ParsePathGeometryData(GetPathGeometryData(), ctx);
return ctx.GetPathGeometry();
}
internal override PathFigureCollection GetTransformedFigureCollection(Transform transform)
{
// This is lossy for consistency with other GetPathFigureCollection() implementations
// however this limitation doesn't otherwise need to exist for LineGeometry.
Point startPoint = StartPoint;
Point endPoint = EndPoint;
// Apply internal transform
Transform internalTransform = Transform;
if (internalTransform != null && !internalTransform.IsIdentity)
{
Matrix matrix = internalTransform.Value;
startPoint *= matrix;
endPoint *= matrix;
}
// Apply external transform
if (transform != null && !transform.IsIdentity)
{
Matrix matrix = transform.Value;
startPoint *= matrix;
endPoint *= matrix;
}
PathFigureCollection collection = new PathFigureCollection();
collection.Add(
new PathFigure(
startPoint,
new PathSegment[]{new LineSegment(endPoint, true)},
false // ==> not closed
)
);
return collection;
}
/// <summary>
/// GetPathGeometryData - returns a byte[] which contains this Geometry represented
/// as a path geometry's serialized format.
/// </summary>
internal override PathGeometryData GetPathGeometryData()
{
if (IsObviouslyEmpty())
{
return Geometry.GetEmptyPathGeometryData();
}
PathGeometryData data = new PathGeometryData();
data.FillRule = FillRule.EvenOdd;
data.Matrix = CompositionResourceManager.TransformToMilMatrix3x2D(Transform);
ByteStreamGeometryContext ctx = new ByteStreamGeometryContext();
ctx.BeginFigure(StartPoint, true /* is filled */, false /* is closed */);
ctx.LineTo(EndPoint, true /* is stroked */, false /* is smooth join */);
ctx.Close();
data.SerializedData = ctx.GetData();
return data;
}
#region Static Data
private const UInt32 c_segmentCount = 1;
private const UInt32 c_pointCount = 2;
#endregion
}
}
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