private IEnumerable <Shape> _addSerieAsBezier(Point[] points, bool animate = true)
{
if (points.Length < 2)
{
return(Enumerable.Empty <Shape>());
}
var addedFigures = new List <Shape>();
Point[] cp1, cp2;
BezierSpline.GetCurveControlPoints(points, out cp1, out cp2);
var lines = new PathSegmentCollection();
var areaLines = new PathSegmentCollection {
new LineSegment(points[0], true)
};
var l = 0d;
for (var i = 0; i < cp1.Length; ++i)
{
lines.Add(new BezierSegment(cp1[i], cp2[i], points[i + 1], true));
areaLines.Add(new BezierSegment(cp1[i], cp2[i], points[i + 1], true));
//it would be awesome to use a better formula to calculate bezier lenght
l += Math.Sqrt(
Math.Pow(Math.Abs(cp1[i].X - cp2[i].X), 2) +
Math.Pow(Math.Abs(cp1[i].Y - cp2[i].Y), 2));
l += Math.Sqrt(
Math.Pow(Math.Abs(cp2[i].X - points[i + 1].X), 2) +
Math.Pow(Math.Abs(cp2[i].Y - points[i + 1].Y), 2));
}
//aprox factor, it was calculated by aproximation.
//the more line is curved, the more it fails.
l = l * .65;
areaLines.Add(new LineSegment(new Point(points.Max(x => x.X), ToPlotArea(Chart.Min.Y, AxisTags.Y)), true));
var f = new PathFigure(points[0], lines, false);
var fa = new PathFigure(new Point(points.Min(x => x.X), ToPlotArea(Chart.Min.Y, AxisTags.Y)), areaLines, false);
var g = new PathGeometry(new[] { f });
var ga = new PathGeometry(new[] { fa });
var path = new Path
{
Stroke = Stroke,
StrokeThickness = StrokeThickness,
Data = g,
StrokeEndLineCap = PenLineCap.Round,
StrokeStartLineCap = PenLineCap.Round,
StrokeDashOffset = l,
StrokeDashArray = new DoubleCollection {
l, l
},
ClipToBounds = true
};
var patha = new Path
{
StrokeThickness = 0,
Data = ga,
Fill = Fill,
ClipToBounds = true
};
Chart.Canvas.Children.Add(path);
addedFigures.Add(path);
Chart.Canvas.Children.Add(patha);
addedFigures.Add(patha);
var draw = new DoubleAnimationUsingKeyFrames
{
BeginTime = TimeSpan.FromSeconds(0),
KeyFrames = new DoubleKeyFrameCollection
{
new SplineDoubleKeyFrame
{
KeyTime = TimeSpan.FromMilliseconds(1),
Value = l
},
new SplineDoubleKeyFrame
{
KeyTime = TimeSpan.FromMilliseconds(750),
Value = 0
}
}
};
Storyboard.SetTarget(draw, path);
Storyboard.SetTargetProperty(draw, new PropertyPath(Shape.StrokeDashOffsetProperty));
var sbDraw = new Storyboard();
sbDraw.Children.Add(draw);
var animated = false;
if (!Chart.DisableAnimation)
{
if (animate)
{
sbDraw.Begin();
animated = true;
}
}
if (!animated)
{
path.StrokeDashOffset = 0;
}
return(addedFigures);
}
private IEnumerable <Shape> _addSerieAsBezier(Point[] points, bool animate = true)
{
if (points.Length < 2)
{
return(Enumerable.Empty <Shape>());
}
var addedFigures = new List <Shape>();
Point[] cp1, cp2;
BezierSpline.GetCurveControlPoints(points, out cp1, out cp2);
var lines = new PathSegmentCollection();
var areaLines = new PathSegmentCollection {
new LineSegment(points[0], true)
};
var l = 0d;
for (var i = 0; i < cp1.Length; ++i)
{
lines.Add(new BezierSegment(cp1[i], cp2[i], points[i + 1], true));
areaLines.Add(new BezierSegment(cp1[i], cp2[i], points[i + 1], true));
l += GetBezierLength(new [] { points[i], cp1[i], cp2[i], points[i + 1] });
}
l *= 1.05;
l /= StrokeThickness;
var lastP = Chart.Invert
? new Point(ToDrawMargin(Chart.Min.X, AxisTags.X), points.Min(x => x.Y))
: new Point(points.Max(x => x.X), ToDrawMargin(Chart.Min.Y, AxisTags.Y));
areaLines.Add(new LineSegment(lastP, true));
var f = new PathFigure(points[0], lines, false);
var aOrigin = Chart.Invert
? new Point(ToDrawMargin(Chart.Min.X, AxisTags.X), points.Max(x => x.Y))
: new Point(points.Min(x => x.X), ToDrawMargin(Chart.Min.Y, AxisTags.Y));
var fa = new PathFigure(aOrigin, areaLines, false);
var g = new PathGeometry(new[] { f });
var ga = new PathGeometry(new[] { fa });
var path = new Path
{
Stroke = Stroke,
StrokeThickness = StrokeThickness,
Data = g,
StrokeEndLineCap = PenLineCap.Round,
StrokeStartLineCap = PenLineCap.Round,
StrokeDashOffset = l,
StrokeDashArray = new DoubleCollection {
l, l
},
ClipToBounds = true
};
var patha = new Path
{
StrokeThickness = 0,
Data = ga,
Fill = Fill,
ClipToBounds = true
};
Chart.DrawMargin.Children.Add(path);
addedFigures.Add(path);
Chart.DrawMargin.Children.Add(patha);
addedFigures.Add(patha);
var draw = new DoubleAnimationUsingKeyFrames
{
BeginTime = TimeSpan.FromSeconds(0),
KeyFrames = new DoubleKeyFrameCollection
{
new SplineDoubleKeyFrame
{
KeyTime = TimeSpan.FromMilliseconds(1),
Value = l
},
new SplineDoubleKeyFrame
{
KeyTime = TimeSpan.FromMilliseconds(750),
Value = 0
}
}
};
Storyboard.SetTarget(draw, path);
Storyboard.SetTargetProperty(draw, new PropertyPath(Shape.StrokeDashOffsetProperty));
var sbDraw = new Storyboard();
sbDraw.Children.Add(draw);
var animated = false;
if (!Chart.DisableAnimation)
{
if (animate)
{
sbDraw.Begin();
animated = true;
}
}
if (!animated)
{
path.StrokeDashOffset = 0;
}
return(addedFigures);
}