/// <summary>
/// Parses a PolyQuadraticBezierSegment element.
/// </summary>
PolyQuadraticBezierSegment ParsePolyQuadraticBezierSegment()
{
Debug.Assert(this.reader.Name == "PolyQuadraticBezierSegment");
PolyQuadraticBezierSegment seg = new PolyQuadraticBezierSegment();
while (MoveToNextAttribute())
{
switch (this.reader.Name)
{
case "IsStroked":
seg.IsStroked = ParseBool(this.reader.Value);
break;
case "Points":
seg.Points = Point.ParsePoints(this.reader.Value);
break;
default:
UnexpectedAttribute(this.reader.Name);
break;
}
}
MoveBeyondThisElement();
return seg;
}
/// <summary>
/// Writes the specified PolyQuadraticBezierSegment to the content stream.
/// </summary>
internal void WriteSegment(PolyQuadraticBezierSegment seg)
{
#if true
if (!DevHelper.FlattenPolyQuadraticBezierSegment)
{
int count = seg.Points.Count;
PointStopCollection points = seg.Points;
Point pt0 = this.currentPoint;
for (int idx = 0; idx < count - 1; )
{
Point pt1 = points[idx++];
Point pt2 = points[idx++];
// Cannot believe it: I just guessed the formula and it works!
WriteLiteral("{0:0.####} {1:0.####} {2:0.####} {3:0.####} {4:0.####} {5:0.####} c\n",
pt1.X - (pt1.X - pt0.X) / 3, pt1.Y - (pt1.Y - pt0.Y) / 3,
pt1.X + (pt2.X - pt1.X) / 3, pt1.Y + (pt2.Y - pt1.Y) / 3,
pt2.X, pt2.Y);
this.currentPoint = pt0 = pt2;
}
}
else
{
PolyLineSegment lseg = WpfUtils.FlattenSegment(this.currentPoint, seg);
WriteSegment(lseg);
}
#else
// TODO: Convert quadratic Bezier curve in cubic Bézier curve
PolyLineSegment lseg = WpfUtils.FlattenSegment(this.currentPoint, seg);
WriteSegment(lseg);
#endif
}
/// <summary>
/// Parses a PathGeometry from a data string element.
/// </summary>
PathGeometry ParsePathGeometry(string data)
{
#if DEBUG_
// XPS = M 20,100 C 45,50 70,150 95,100 S 145,150 170,100 220,150 245,100 C 220,50 195,150 170,100 S 120,150 95,100 45,150 20,100
// XXX = M20,100C45,50 70,150 95,100 120,50 145,150 170,100 195,50 220,150 245,100 220,50 195,150 170,100 145,50 120,150 95,100 70,50 45,150 20,100
if (data.StartsWith("M 20,100 C 45,50 70,150 95,100 S 145,"))
Debugger.Break();
#endif
PathGeometry geo = TryParseStaticResource<PathGeometry>(data);
if (geo != null)
return geo;
data = FixHack(data);
// From the algorithm on page 365 in XPS 1.0 specs
// See Petzold page 813
geo = new PathGeometry();
Point point = new Point();
PathFigure figure = null;
TokenizerHelper helper = new TokenizerHelper(data);
helper.NextTokenRequired();
do
{
string token = helper.GetCurrentToken();
switch (token[0])
{
// FillRule
case 'F':
geo.FillRule = helper.NextTokenRequired() == "1" ? FillRule.NonZero : FillRule.EvenOdd;
break;
// Move
case 'M':
{
figure = new PathFigure();
geo.Figures.Add(figure);
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
figure.StartPoint = point;
}
break;
// Move
case 'm':
{
figure = new PathFigure();
geo.Figures.Add(figure);
point = new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired()));
figure.StartPoint = point;
}
break;
// Line
case 'L':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Line
case 'l':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Horizontal Line
case 'H':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point.X = ParseDouble(helper.NextTokenRequired());
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Horizontal Line
case 'h':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point.X += ParseDouble(helper.NextTokenRequired());
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Vertical Line
case 'V':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point.Y = ParseDouble(helper.NextTokenRequired());
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Vertical Line
case 'v':
{
PolyLineSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyLineSegment) != null)
{ }
else
{
seg = new PolyLineSegment();
figure.Segments.Add(seg);
}
do
{
point.Y += ParseDouble(helper.NextTokenRequired());
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Elliptical Arc
case 'A':
do
{
// I cannot believe it: "A70.1,50.1 1,34 0 0 170.1,30.1"
// The rotation angle "1,34" uses a ',' instead of a '.' in my German Windows Vista!
//A70.1,50.1 1,34 0 0 170.1,30.1
ArcSegment seg = new ArcSegment();
figure.Segments.Add(seg);
seg.Size = new Size(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.RotationAngle = ParseDouble(helper.NextTokenRequired());
seg.IsLargeArc = helper.NextTokenRequired() == "1";
seg.SweepDirection = helper.NextTokenRequired() == "1" ? SweepDirection.Clockwise : SweepDirection.Counterclockwise;
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Point = point;
} while (!Char.IsLetter(helper.PeekNextCharacter()));
break;
// Elliptical Arc
case 'a':
do
{
ArcSegment seg = new ArcSegment();
figure.Segments.Add(seg);
seg.Size = new Size(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.RotationAngle = ParseDouble(helper.NextTokenRequired());
seg.IsLargeArc = helper.NextTokenRequired() == "1";
seg.SweepDirection = helper.NextTokenRequired() == "1" ? SweepDirection.Clockwise : SweepDirection.Counterclockwise;
point = new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired()));
seg.Point = point;
} while (!Char.IsLetter(helper.PeekNextCharacter()));
break;
// Cubic Bézier Curve
case 'C':
{
PolyBezierSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyBezierSegment) != null)
{ }
else
{
seg = new PolyBezierSegment();
figure.Segments.Add(seg);
}
do
{
seg.Points.Add(new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired())));
seg.Points.Add(new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired())));
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Cubic Bézier Curve
case 'c':
{
PolyBezierSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyBezierSegment) != null)
{ }
else
{
seg = new PolyBezierSegment();
figure.Segments.Add(seg);
}
do
{
seg.Points.Add(new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired())));
seg.Points.Add(new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired())));
point = new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Smooth Cubic Bézier Curve
case 'S':
{
PolyBezierSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyBezierSegment) != null)
{ }
else
{
seg = new PolyBezierSegment();
figure.Segments.Add(seg);
}
do
{
Point pt = new Point();
int count = seg.Points.Count;
segCount = figure.Segments.Count;
if (count > 0)
{
Point lastCtrlPoint = seg.Points[count - 2];
pt.X = 2 * point.X - lastCtrlPoint.X;
pt.Y = 2 * point.Y - lastCtrlPoint.Y;
}
else if (segCount > 1 && figure.Segments[count - 2] is PolyBezierSegment)
{
PolyBezierSegment lastSeg = (PolyBezierSegment)figure.Segments[count - 2];
count = lastSeg.Points.Count;
Point lastCtrlPoint = lastSeg.Points[count - 2];
pt.X = 2 * point.X - lastCtrlPoint.X;
pt.Y = 2 * point.Y - lastCtrlPoint.Y;
}
else
{
pt = point;
}
seg.Points.Add(pt);
seg.Points.Add(new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired())));
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Smooth Cubic Bézier Curve
case 's':
{
PolyBezierSegment seg;
int segCount = figure.Segments.Count;
if (segCount > 0 && (seg = figure.Segments[segCount - 1] as PolyBezierSegment) != null)
{ }
else
{
seg = new PolyBezierSegment();
figure.Segments.Add(seg);
}
do
{
Point pt = new Point();
int count = seg.Points.Count;
segCount = figure.Segments.Count;
if (count > 0)
{
Point lastCtrlPoint = seg.Points[count - 2];
pt.X = 2 * point.X - lastCtrlPoint.X;
pt.Y = 2 * point.Y - lastCtrlPoint.Y;
}
else if (segCount > 1 && figure.Segments[count - 2] is PolyBezierSegment)
{
PolyBezierSegment lastSeg = (PolyBezierSegment)figure.Segments[count - 2];
count = lastSeg.Points.Count;
Point lastCtrlPoint = lastSeg.Points[count - 2];
pt.X = 2 * point.X - lastCtrlPoint.X;
pt.Y = 2 * point.Y - lastCtrlPoint.Y;
}
else
{
pt = point;
}
seg.Points.Add(pt);
seg.Points.Add(new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired())));
point = new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Quadratic Bézier Curve
case 'Q':
{
PolyQuadraticBezierSegment seg = new PolyQuadraticBezierSegment();
figure.Segments.Add(seg);
do
{
seg.Points.Add(new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired())));
point = new Point(ParseDouble(helper.NextTokenRequired()), ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Quadratic Bézier Curve
case 'q':
{
PolyQuadraticBezierSegment seg = new PolyQuadraticBezierSegment();
figure.Segments.Add(seg);
do
{
seg.Points.Add(new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired())));
point = new Point(point.X + ParseDouble(helper.NextTokenRequired()), point.Y + ParseDouble(helper.NextTokenRequired()));
seg.Points.Add(point);
} while (!Char.IsLetter(helper.PeekNextCharacter()));
}
break;
// Close
case 'Z':
case 'z':
{
figure.IsClosed = true;
if (figure.Segments.Count > 0)
{
PathSegment seg = figure.Segments[0];
}
point = figure.StartPoint;
figure = null;
}
break;
default:
Debug.Assert(false);
break;
}
} while (helper.NextToken());
return geo;
}