private Point GetPosition(double value, EllipseGeometry geometry)
{
var pathGeometry = geometry.GetOutlinedPathGeometry();
if (pathGeometry.Figures.Count == 0)
{
return(geometry.Center);
}
var outherGeometry = new PathGeometry(new[] { pathGeometry.Figures[0] });
Point outherPoint, outherTangent;
outherGeometry.GetPointAtFractionLength(value, out outherPoint, out outherTangent);
return(outherPoint);
}
public void ArcUpdate()
{
// 線の太さ
double thick = this.ViewModel.StrokeThickness;
// 入力値切捨て
double inputValue = Math.Floor(this.ViewModel.Percentage * 100.0);
// 角度の計算
double angle = (inputValue * 3.6);
if (angle < 0)
{
angle += 360;
}
if (angle > 360)
{
angle %= 360.0;
}
// 0-360を許容
if (0 < angle && angle < 360)
{
// 角度によってフラグを変える
this.ViewModel.IsLargeArcFlg = false;
if (angle >= 180)
{
// 180°を超える(180を含む)場合はフラグをtrue
this.ViewModel.IsLargeArcFlg = true;
}
}
// 角度と半径から座標を計算
double radius = (this.pathArc.Width / 2) - thick;
pathArc.StrokeThickness = thick;
pathCircleBackground.StrokeThickness = thick;
if (angle != 0 && angle != 360)
{
angle -= 90;
double radian = Math.PI * angle / 180.0;
double x = radius * Math.Cos(radian);
double y = radius * Math.Sin(radian);
x = ToRoundDown(x, 3);
y = ToRoundDown(y, 3);
// 終点計算
double endPointX = radius + x + thick;
double endPointY = radius + y + thick;
// 図形生成
PathFigure pfArc = new PathFigure();
pfArc.StartPoint = new Point(100, thick); // 開始点
// セグメント生成
ArcSegment arc = new ArcSegment();
arc.Point = new Point(endPointX, endPointY); // 終点(計算値)
arc.Size = new Size(radius, radius); // 半径
arc.IsLargeArc = this.ViewModel.IsLargeArcFlg;
arc.SweepDirection = SweepDirection.Clockwise;
//arc.RotationAngle = Math.PI * -90.0 / 180.0;
// 図形入れ替え
pfArc.Segments.Clear();
pfArc.Segments.Add(arc);
this.pathGeometryArc.Figures.Clear();
this.pathGeometryArc.Figures.Add(pfArc);
// 図形生成（背景）
PathFigure pfCircle = new PathFigure();
pfCircle.StartPoint = new Point(100, thick); // 開始点
// セグメント生成
ArcSegment circle = new ArcSegment();
circle.Point = new Point(endPointX, endPointY); // 終点(計算値)
circle.Size = new Size(radius, radius); // 半径
circle.IsLargeArc = !this.ViewModel.IsLargeArcFlg;
circle.SweepDirection = SweepDirection.Counterclockwise;
// 図形入れ替え
pfCircle.Segments.Clear();
pfCircle.Segments.Add(circle);
this.pathGeometryCircle.Figures.Clear();
this.pathGeometryCircle.Figures.Add(pfCircle);
}
else
{
var center = new Point(this.pathArc.Width / 2, this.pathArc.Height / 2);
var circle = new EllipseGeometry(center, radius, radius);
var pathgeo = circle.GetOutlinedPathGeometry();
this.pathGeometryArc.Clear();
this.pathGeometryCircle.Clear();
if (angle == 0)
{
this.pathGeometryCircle.Figures = pathgeo.Figures;
}
else
{
this.pathGeometryArc.Figures = pathgeo.Figures;
}
}
}
/// <summary>
/// Positionates each child in an ellipse form depending on the amount of child controls.
/// </summary>
/// <param name="finalSize">The maximum possible space given by the parent control.</param>
/// <returns>The calculated needed space in sum of all available child controls.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
if (finalSize.Height <= 0 ||
finalSize.Width <= 0)
{
return(finalSize);
}
if (InternalChildren.Count <= 0)
{
return(base.ArrangeOverride(finalSize));
}
ResetEllipse(finalSize);
var figure = _ellipse.GetOutlinedPathGeometry().Figures[0];
var pathGeometry = new PathGeometry(new[] { figure });
var points = new List <Point>();
var tangents = new List <Point>();
var distance = (double)1 / (double)InternalChildren.Count;
var position = GetElementStartPositionValue();
foreach (var child in InternalChildren)
{
Point point, tangent;
pathGeometry.GetPointAtFractionLength(position, out point, out tangent);
points.Add(point);
tangents.Add(tangent);
position += distance;
if (position > 1)
{
position -= 1;
}
}
if (EllipseRotateDirection == SweepDirection.Counterclockwise)
{
points.Reverse();
tangents.Reverse();
var point = points.Last();
points.Remove(point);
points.Insert(0, point);
var tangent = tangents.Last();
tangents.Remove(tangent);
tangents.Insert(0, tangent);
}
int pos = 0;
foreach (UIElement child in InternalChildren)
{
var childSize = child.DesiredSize;
var elementPos = points[pos];
elementPos.X -= childSize.Width / 2;
elementPos.Y -= childSize.Height / 2;
child.SnapsToDevicePixels = true;
child.Arrange(new Rect(elementPos, childSize));
if (RotateElements)
{
var elementCenter = new Size(childSize.Width / 2, childSize.Height / 2);
var transforms = new TransformGroup();
var centerPoint = new Point(finalSize.Width / 2, finalSize.Height / 2);
var angle = CalculatePileToPlayerAngle(elementPos, centerPoint);
transforms.Children.Add(new RotateTransform(angle, elementCenter.Width, elementCenter.Height));
//transforms.Children.Add(new RotateTransform((Math.Atan2(tangents[pos].Y, tangents[pos].X)
// * 180
// / Math.PI)
// + GetElementsRotateDirectionValue(),
// elementCenter.Width,
// elementCenter.Height));
child.RenderTransform = transforms;
}
else
{
child.RenderTransform = null;
}
++pos;
}
return(base.ArrangeOverride(finalSize));
}
