/// <summary>
/// Called when the value of the RatioStringFormatProperty property changes.
/// </summary>
/// <param name="d">PieDataPoint that changed its RatioStringFormat.</param>
/// <param name="e">Event arguments.</param>
private static void OnRatioStringFormatPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PieDataPoint source = d as PieDataPoint;
string newValue = e.NewValue as string;
source.OnRatioStringFormatPropertyChanged(newValue);
}
/// <summary>
/// Called when the value of the RatioProperty property changes.
/// </summary>
/// <param name="d">PieDataPoint that changed its Ratio.</param>
/// <param name="e">Event arguments.</param>
private static void OnRatioPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PieDataPoint source = (PieDataPoint)d;
double oldValue = (double)e.OldValue;
double newValue = (double)e.NewValue;
source.OnRatioPropertyChanged(oldValue, newValue);
}
/// <summary>
/// Updates a data point.
/// </summary>
/// <param name="dataPoint">The data point to update.</param>
protected override void UpdateDataPoint(DataPoint dataPoint)
{
PieDataPoint pieDataPoint = (PieDataPoint)dataPoint;
pieDataPoint.Width = ActualWidth;
pieDataPoint.Height = ActualHeight;
UpdatePieDataPointGeometry(pieDataPoint, ActualWidth, ActualHeight);
Canvas.SetLeft(pieDataPoint, 0);
Canvas.SetTop(pieDataPoint, 0);
}
/// <summary>
/// Detaches event handlers from a data point.
/// </summary>
/// <param name="dataPoint">The data point.</param>
protected override void DetachEventHandlersFromDataPoint(DataPoint dataPoint)
{
PieDataPoint pieDataPoint = dataPoint as PieDataPoint;
pieDataPoint.ActualRatioChanged -= OnPieDataPointActualRatioChanged;
pieDataPoint.ActualOffsetRatioChanged -= OnPieDataPointActualOffsetRatioChanged;
pieDataPoint.RatioChanged -= OnPieDataPointRatioChanged;
pieDataPoint.OffsetRatioChanged -= OnPieDataPointOffsetRatioChanged;
base.DetachEventHandlersFromDataPoint(dataPoint);
}
/// <summary>
/// Updates the PieDataPoint's Geometry property.
/// </summary>
/// <param name="pieDataPoint">PieDataPoint instance.</param>
/// <param name="plotAreaWidth">PlotArea width.</param>
/// <param name="plotAreaHeight">PlotArea height.</param>
internal static void UpdatePieDataPointGeometry(PieDataPoint pieDataPoint, double plotAreaWidth, double plotAreaHeight)
{
double diameter = (plotAreaWidth < plotAreaHeight) ? plotAreaWidth : plotAreaHeight;
diameter *= 0.95;
double plotAreaRadius = diameter / 2;
double maxDistanceFromCenter = 0.0;
double sliceRadius = plotAreaRadius - maxDistanceFromCenter;
Point translatePoint = new Point(plotAreaWidth / 2, plotAreaHeight / 2);
if (pieDataPoint.ActualRatio == 1)
{
foreach (DependencyProperty dependencyProperty in new DependencyProperty[] { PieDataPoint.GeometryProperty, PieDataPoint.GeometrySelectionProperty, PieDataPoint.GeometryHighlightProperty })
{
Geometry geometry =
new EllipseGeometry
{
Center = translatePoint,
RadiusX = sliceRadius,
RadiusY = sliceRadius
};
pieDataPoint.SetValue(dependencyProperty, geometry);
}
}
else
{
if (pieDataPoint.ActualRatio == 0.0)
{
pieDataPoint.Geometry = null;
pieDataPoint.GeometryHighlight = null;
pieDataPoint.GeometrySelection = null;
}
else
{
double ratio = pieDataPoint.ActualRatio;
double offsetRatio = pieDataPoint.ActualOffsetRatio;
double currentRatio = offsetRatio + ratio;
Point offsetRatioPoint = ConvertRatioOfRotationToPoint(offsetRatio, sliceRadius, sliceRadius);
Point adjustedOffsetRatioPoint = Translate(offsetRatioPoint, translatePoint);
// Calculate the last clockwise point in the pie slice
Point currentRatioPoint =
ConvertRatioOfRotationToPoint(currentRatio, sliceRadius, sliceRadius);
// Adjust point using center of plot area as origin
// instead of 0,0
Point adjustedCurrentRatioPoint =
Translate(currentRatioPoint, translatePoint);
foreach (DependencyProperty dependencyProperty in new DependencyProperty[] { PieDataPoint.GeometryProperty, PieDataPoint.GeometrySelectionProperty, PieDataPoint.GeometryHighlightProperty })
{
// Creating the pie slice geometry object
PathFigure pathFigure = new PathFigure {
IsClosed = true
};
pathFigure.StartPoint = translatePoint;
pathFigure.Segments.Add(new LineSegment {
Point = adjustedOffsetRatioPoint
});
bool isLargeArc = (currentRatio - offsetRatio) > 0.5;
pathFigure.Segments.Add(
new ArcSegment
{
Point = adjustedCurrentRatioPoint,
IsLargeArc = isLargeArc,
Size = new Size(sliceRadius, sliceRadius),
SweepDirection = SweepDirection.Clockwise
});
PathGeometry pathGeometry = new PathGeometry();
pathGeometry.Figures.Add(pathFigure);
pieDataPoint.SetValue(dependencyProperty, pathGeometry);
}
}
}
}
/// <summary>
/// Updates the PieDataPoint's Geometry property.
/// </summary>
/// <param name="pieDataPoint">PieDataPoint instance.</param>
/// <param name="plotAreaWidth">PlotArea width.</param>
/// <param name="plotAreaHeight">PlotArea height.</param>
internal static void UpdatePieDataPointGeometry(PieDataPoint pieDataPoint, double plotAreaWidth, double plotAreaHeight)
{
double diameter = (plotAreaWidth < plotAreaHeight) ? plotAreaWidth : plotAreaHeight;
diameter *= 0.95;
double plotAreaRadius = diameter / 2;
double maxDistanceFromCenter = 0.0;
double sliceRadius = plotAreaRadius - maxDistanceFromCenter;
Point translatePoint = new Point(plotAreaWidth / 2, plotAreaHeight / 2);
if (pieDataPoint.ActualRatio == 1)
{
foreach (DependencyProperty dependencyProperty in new DependencyProperty[] { PieDataPoint.GeometryProperty, PieDataPoint.GeometrySelectionProperty, PieDataPoint.GeometryHighlightProperty })
{
Geometry geometry =
new EllipseGeometry
{
Center = translatePoint,
RadiusX = sliceRadius,
RadiusY = sliceRadius
};
pieDataPoint.SetValue(dependencyProperty, geometry);
}
}
else
{
if (pieDataPoint.ActualRatio == 0.0)
{
pieDataPoint.Geometry = null;
pieDataPoint.GeometryHighlight = null;
pieDataPoint.GeometrySelection = null;
}
else
{
double ratio = pieDataPoint.ActualRatio;
double offsetRatio = pieDataPoint.ActualOffsetRatio;
double currentRatio = offsetRatio + ratio;
Point offsetRatioPoint = ConvertRatioOfRotationToPoint(offsetRatio, sliceRadius, sliceRadius);
Point adjustedOffsetRatioPoint = Translate(offsetRatioPoint, translatePoint);
// Calculate the last clockwise point in the pie slice
Point currentRatioPoint =
ConvertRatioOfRotationToPoint(currentRatio, sliceRadius, sliceRadius);
// Adjust point using center of plot area as origin
// instead of 0,0
Point adjustedCurrentRatioPoint =
Translate(currentRatioPoint, translatePoint);
foreach (DependencyProperty dependencyProperty in new DependencyProperty[] { PieDataPoint.GeometryProperty, PieDataPoint.GeometrySelectionProperty, PieDataPoint.GeometryHighlightProperty })
{
// Creating the pie slice geometry object
PathFigure pathFigure = new PathFigure { IsClosed = true };
pathFigure.StartPoint = translatePoint;
pathFigure.Segments.Add(new LineSegment { Point = adjustedOffsetRatioPoint });
bool isLargeArc = (currentRatio - offsetRatio) > 0.5;
pathFigure.Segments.Add(
new ArcSegment
{
Point = adjustedCurrentRatioPoint,
IsLargeArc = isLargeArc,
Size = new Size(sliceRadius, sliceRadius),
SweepDirection = SweepDirection.Clockwise
});
PathGeometry pathGeometry = new PathGeometry();
pathGeometry.Figures.Add(pathFigure);
pieDataPoint.SetValue(dependencyProperty, pathGeometry);
}
}
}
}
