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//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2001
//
// File: RectangleGeometry.cs
//------------------------------------------------------------------------------
using System;
using MS.Internal;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using System.Collections;
using System.Text;
using System.Globalization;
using System.Windows.Media;
using System.Windows.Media.Composition;
using System.Windows;
using System.Text.RegularExpressions;
using System.Windows.Media.Animation;
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 Rectangles and RoundedRectangles.
/// </summary>
public sealed partial class RectangleGeometry : Geometry
{
#region Constructors
/// <summary>
///
/// </summary>
public RectangleGeometry()
{
}
/// <summary>
/// Constructor - sets the rounded rectangle to equal the passed in parameters
/// </summary>
public RectangleGeometry(Rect rect)
{
Rect = rect;
}
/// <summary>
/// Constructor - sets the rounded rectangle to equal the passed in parameters
/// </summary>
public RectangleGeometry(Rect rect,
double radiusX,
double radiusY) : this(rect)
{
RadiusX = radiusX;
RadiusY = radiusY;
}
/// <summary>
///
/// </summary>
/// <param name="rect"></param>
/// <param name="radiusX"></param>
/// <param name="radiusY"></param>
/// <param name="transform"></param>
public RectangleGeometry(
Rect rect,
double radiusX,
double radiusY,
Transform transform) : this(rect, radiusX, radiusY)
{
Transform = transform;
}
#endregion
/// <summary>
/// Gets the bounds of this Geometry as an axis-aligned bounding box
/// </summary>
public override Rect Bounds
{
get
{
ReadPreamble();
Rect boundsRect;
Rect currentRect = Rect;
Transform transform = Transform;
if (currentRect.IsEmpty)
{
boundsRect = Rect.Empty;
}
else if (transform == null || transform.IsIdentity)
{
boundsRect = currentRect;
}
else
{
double radiusX = RadiusX;
double radiusY = RadiusY;
if (radiusX == 0 && radiusY == 0)
{
boundsRect = currentRect;
transform.TransformRect(ref boundsRect);
}
else
{
//
// Transformed rounded rectangles are more tricky.
//
//
Matrix geometryMatrix;
Transform.GetTransformValue(transform, out geometryMatrix);
boundsRect = RectangleGeometry.GetBoundsHelper(
null /* no pen */,
Matrix.Identity,
currentRect,
radiusX,
radiusY,
geometryMatrix,
StandardFlatteningTolerance,
ToleranceType.Absolute);
}
}
return boundsRect;
}
}
internal override bool AreClose(Geometry geometry)
{
RectangleGeometry rectGeometry2 = geometry as RectangleGeometry;
if (rectGeometry2 != null)
{
RectangleGeometry rectGeometry1 = this;
Rect rect1 = rectGeometry1.Rect;
Rect rect2 = rectGeometry2.Rect;
return (
DoubleUtil.AreClose(rect1.X, rect2.X) &&
DoubleUtil.AreClose(rect1.Y, rect2.Y) &&
DoubleUtil.AreClose(rect1.Width, rect2.Width) &&
DoubleUtil.AreClose(rect1.Height, rect2.Height) &&
DoubleUtil.AreClose(rectGeometry1.RadiusX, rectGeometry2.RadiusX) &&
DoubleUtil.AreClose(rectGeometry1.RadiusY, rectGeometry2.RadiusY) &&
(rectGeometry1.Transform == rectGeometry2.Transform) &&
(rectGeometry1.IsFrozen == rectGeometry2.IsFrozen)
);
}
return base.AreClose(geometry);
}
/// <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 RectangleGeometry.GetBoundsHelper(
pen,
worldMatrix,
Rect,
RadiusX,
RadiusY,
geometryMatrix,
tolerance,
type);
}
/// <SecurityNote>
/// Critical - it calls a critical method, Geometry.GetBoundsHelper and has an unsafe block
/// TreatAsSafe - returning a RectangleGeometry's bounds is considered safe
/// </SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
internal static Rect GetBoundsHelper(Pen pen, Matrix worldMatrix, Rect rect, double radiusX, double radiusY,
Matrix geometryMatrix, double tolerance, ToleranceType type)
{
Rect boundingRect;
Debug.Assert(worldMatrix != null);
Debug.Assert(geometryMatrix != null);
if (rect.IsEmpty)
{
boundingRect = Rect.Empty;
}
else if ( (pen == null || pen.DoesNotContainGaps) &&
geometryMatrix.IsIdentity && worldMatrix.IsIdentity)
{
double strokeThickness = 0.0;
boundingRect = rect;
if (Pen.ContributesToBounds(pen))
{
strokeThickness = Math.Abs(pen.Thickness);
boundingRect.X -= 0.5*strokeThickness;
boundingRect.Y -= 0.5*strokeThickness;
boundingRect.Width += strokeThickness;
boundingRect.Height += strokeThickness;
}
}
else
{
unsafe
{
uint pointCount, segmentCount;
GetCounts(rect, radiusX, radiusY, out pointCount, out segmentCount);
// We've checked that rect isn't empty above
Invariant.Assert(pointCount != 0);
Point * pPoints = stackalloc Point[(int)pointCount];
RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY);
fixed (byte *pTypes = RectangleGeometry.GetTypeList(rect, radiusX, radiusY))
{
boundingRect = Geometry.GetBoundsHelper(
pen,
&worldMatrix,
pPoints,
pTypes,
pointCount,
segmentCount,
&geometryMatrix,
tolerance,
type,
false); // skip hollows - meaningless here, this is never a hollow
}
}
}
return boundingRect;
}
/// <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)
{
if (IsEmpty())
{
return false;
}
double radiusX = RadiusX;
double radiusY = RadiusY;
Rect rect = Rect;
uint pointCount = GetPointCount(rect, radiusX, radiusY);
uint segmentCount = GetSegmentCount(rect, radiusX, radiusY);
unsafe
{
Point *pPoints = stackalloc Point[(int)pointCount];
RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY);
fixed (byte* pTypes = GetTypeList(rect, radiusX, radiusY))
{
return ContainsInternal(
pen,
hitPoint,
tolerance,
type,
pPoints,
pointCount,
pTypes,
segmentCount);
}
}
}
/// <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)
{
ReadPreamble();
if (IsEmpty())
{
return 0.0;
}
double radiusX = RadiusX;
double radiusY = RadiusY;
Rect rect = Rect;
// Get the area of the bounding rectangle
double area = Math.Abs(rect.Width * rect.Height);
// correct it for the rounded corners
area -= Math.Abs(radiusX * radiusY) * (4.0 - Math.PI);
// Adjust to internal transformation
Transform transform = Transform;
if (!transform.IsIdentity)
{
area *= Math.Abs(transform.Value.Determinant);
}
return area;
}
internal override PathFigureCollection GetTransformedFigureCollection(Transform transform)
{
if (IsEmpty())
{
return null;
}
// Combine the transform argument with the internal transform
Matrix matrix = GetCombinedMatrix(transform);
double radiusX = RadiusX;
double radiusY = RadiusY;
Rect rect = Rect;
if (IsRounded(radiusX, radiusY))
{
Point[] points = GetPointList(rect, radiusX, radiusY);
// Transform if applicable.
if (!matrix.IsIdentity)
{
for (int i=0; i<points.Length; i++)
{
points[i] *= matrix;
}
}
PathFigureCollection collection = new PathFigureCollection();
collection.Add(
new PathFigure(
points[0],
new PathSegment[]{
new BezierSegment(points[1], points[2], points[3], true, true),
new LineSegment(points[4], true, true),
new BezierSegment(points[5], points[6], points[7], true, true),
new LineSegment(points[8], true, true),
new BezierSegment(points[9], points[10], points[11], true, true),
new LineSegment(points[12], true, true),
new BezierSegment(points[13], points[14], points[15], true, true)},
true // closed
)
);
return collection;
}
else
{
PathFigureCollection collection = new PathFigureCollection();
collection.Add(
new PathFigure(
rect.TopLeft * matrix,
new PathSegment[]{
new PolyLineSegment(
new Point[]
{
rect.TopRight * matrix,
rect.BottomRight * matrix,
rect.BottomLeft * matrix
},
true)},
true // closed
)
);
return collection;
}
}
internal static bool IsRounded(double radiusX, double radiusY)
{
return (radiusX != 0.0) && (radiusY != 0.0);
}
internal bool IsRounded()
{
return RadiusX != 0.0
&& RadiusY != 0.0;
}
/// <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();
}
/// <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);
double radiusX = RadiusX;
double radiusY = RadiusY;
Rect rect = Rect;
ByteStreamGeometryContext ctx = new ByteStreamGeometryContext();
if (IsRounded(radiusX, radiusY))
{
Point[] points = GetPointList(rect, radiusX, radiusY);
ctx.BeginFigure(points[0], true /* is filled */, true /* is closed */);
ctx.BezierTo(points[1], points[2], points[3], true /* is stroked */, false /* is smooth join */);
ctx.LineTo(points[4], true /* is stroked */, false /* is smooth join */);
ctx.BezierTo(points[5], points[6], points[7], true /* is stroked */, false /* is smooth join */);
ctx.LineTo(points[8], true /* is stroked */, false /* is smooth join */);
ctx.BezierTo(points[9], points[10], points[11], true /* is stroked */, false /* is smooth join */);
ctx.LineTo(points[12], true /* is stroked */, false /* is smooth join */);
ctx.BezierTo(points[13], points[14], points[15], true /* is stroked */, false /* is smooth join */);
}
else
{
ctx.BeginFigure(rect.TopLeft, true /* is filled */, true /* is closed */);
ctx.LineTo(Rect.TopRight, true /* is stroked */, false /* is smooth join */);
ctx.LineTo(Rect.BottomRight, true /* is stroked */, false /* is smooth join */);
ctx.LineTo(Rect.BottomLeft, true /* is stroked */, false /* is smooth join */);
}
ctx.Close();
data.SerializedData = ctx.GetData();
return data;
}
/// <summary>
/// </summary>
/// <returns></returns>
/// <SecurityNote>
/// Critical - Calls critical code
/// TreatAsSafe - returning a RectangleGeometry's point list is considered safe
/// </SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
private Point[] GetPointList(Rect rect, double radiusX, double radiusY)
{
uint pointCount = GetPointCount(rect, radiusX, radiusY);
Point[] points = new Point[pointCount];
unsafe
{
fixed(Point *pPoints = points)
{
RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY);
}
}
return points;
}
/// <SecurityNote>
/// Critical - Accepts pointer arguments
/// </SecurityNote>
[SecurityCritical]
private unsafe static void GetPointList(Point * points, uint pointsCount, Rect rect, double radiusX, double radiusY)
{
if (IsRounded(radiusX, radiusY))
{
// It is a rounded rectangle
Invariant.Assert(pointsCount >= c_roundedPointCount);
radiusX = Math.Min(rect.Width * (1.0 / 2.0), Math.Abs(radiusX));
radiusY = Math.Min(rect.Height * (1.0 / 2.0), Math.Abs(radiusY));
double bezierX = ((1.0 - EllipseGeometry.c_arcAsBezier) * radiusX);
double bezierY = ((1.0 - EllipseGeometry.c_arcAsBezier) * radiusY);
points[1].X = points[0].X = points[15].X = points[14].X = rect.X;
points[2].X = points[13].X = rect.X + bezierX;
points[3].X = points[12].X = rect.X + radiusX;
points[4].X = points[11].X = rect.Right - radiusX;
points[5].X = points[10].X = rect.Right - bezierX;
points[6].X = points[7].X = points[8].X = points[9].X = rect.Right;
points[2].Y = points[3].Y = points[4].Y = points[5].Y = rect.Y;
points[1].Y = points[6].Y = rect.Y + bezierY;
points[0].Y = points[7].Y = rect.Y + radiusY;
points[15].Y = points[8].Y = rect.Bottom - radiusY;
points[14].Y = points[9].Y = rect.Bottom - bezierY;
points[13].Y = points[12].Y = points[11].Y = points[10].Y = rect.Bottom;
points[16] = points[0];
}
else
{
// The rectangle is not rounded
Invariant.Assert(pointsCount >= c_squaredPointCount);
points[0].X = points[3].X = points[4].X = rect.X;
points[1].X = points[2].X = rect.Right;
points[0].Y = points[1].Y = points[4].Y = rect.Y;
points[2].Y = points[3].Y = rect.Bottom;
}
}
private static byte[] GetTypeList(Rect rect, double radiusX, double radiusY)
{
if (rect.IsEmpty)
{
return null;
}
else if (IsRounded(radiusX, radiusY))
{
return s_roundedPathTypes;
}
else
{
return s_squaredPathTypes;
}
}
private uint GetPointCount(Rect rect, double radiusX, double radiusY)
{
if (rect.IsEmpty)
{
return 0;
}
else if (IsRounded(radiusX, radiusY))
{
return c_roundedPointCount;
}
else
{
return c_squaredPointCount;
}
}
private uint GetSegmentCount(Rect rect, double radiusX, double radiusY)
{
if (rect.IsEmpty)
{
return 0;
}
else if (IsRounded(radiusX, radiusY))
{
return c_roundedSegmentCount;
}
else
{
return c_squaredSegmentCount;
}
}
private static void GetCounts(Rect rect, double radiusX, double radiusY, out uint pointCount, out uint segmentCount)
{
if (rect.IsEmpty)
{
pointCount = 0;
segmentCount = 0;
}
else if (IsRounded(radiusX, radiusY))
{
// The rectangle is rounded
pointCount = c_roundedPointCount;
segmentCount = c_roundedSegmentCount;
}
else
{
pointCount = c_squaredPointCount;
segmentCount = c_squaredSegmentCount;
}
}
#region Public Methods
/// <summary>
/// Returns true if this geometry is empty
/// </summary>
public override bool IsEmpty()
{
return Rect.IsEmpty;
}
/// <summary>
/// Returns true if this geometry may have curved segments
/// </summary>
public override bool MayHaveCurves()
{
return IsRounded();
}
#endregion Public Methods
#region InstanceData
// Rouneded
static private UInt32 c_roundedSegmentCount = 8;
static private UInt32 c_roundedPointCount = 17;
static private byte smoothBezier = (byte)MILCoreSegFlags.SegTypeBezier |
(byte)MILCoreSegFlags.SegIsCurved |
(byte)MILCoreSegFlags.SegSmoothJoin;
static private byte smoothLine = (byte)MILCoreSegFlags.SegTypeLine | (byte)MILCoreSegFlags.SegSmoothJoin;
static private byte[] s_roundedPathTypes = {
(byte)MILCoreSegFlags.SegTypeBezier |
(byte)MILCoreSegFlags.SegIsCurved |
(byte)MILCoreSegFlags.SegSmoothJoin |
(byte)MILCoreSegFlags.SegClosed,
smoothLine,
smoothBezier,
smoothLine,
smoothBezier,
smoothLine,
smoothBezier,
smoothLine
};
// Squared
private const UInt32 c_squaredSegmentCount = 4;
private const UInt32 c_squaredPointCount = 5;
private static readonly byte[] s_squaredPathTypes = {
(byte)MILCoreSegFlags.SegTypeLine | (byte)MILCoreSegFlags.SegClosed,
(byte)MILCoreSegFlags.SegTypeLine,
(byte)MILCoreSegFlags.SegTypeLine,
(byte)MILCoreSegFlags.SegTypeLine
};
#endregion
}
}
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