private void Update()
{
if (!IsChartInitialized)
{
return;
}
var ms = new Size(double.PositiveInfinity, double.PositiveInfinity);
Measure(ms);
Canvas.Width = Width;
Canvas.Height = Height;
Func <double, string> defFormatter = x => x.ToString(CultureInfo.InvariantCulture);
var completed = (Value - From) / (To - From);
var t = 0d;
if (double.IsNaN(completed) || double.IsInfinity(completed))
{
completed = 0;
}
completed = completed > 1 ? 1 : (completed < 0 ? 0 : completed);
var angle = Uses360Mode ? 360 : 180;
if (!Uses360Mode)
{
LeftLabel.Text = (LabelFormatter ?? defFormatter)(From);
RightLabel.Text = (LabelFormatter ?? defFormatter)(To);
LeftLabel.Visibility = LabelsVisibility;
RightLabel.Visibility = LabelsVisibility;
t = LeftLabel.ActualHeight;
}
else
{
LeftLabel.Visibility = Visibility.Collapsed;
RightLabel.Visibility = Visibility.Collapsed;
}
double r, top;
if (Uses360Mode)
{
r = ActualWidth > ActualHeight ? ActualHeight: ActualWidth;
r = r / 2 - 2 * t;
top = ActualHeight / 2;
}
else
{
r = ActualWidth;
if (ActualWidth > ActualHeight * 2)
{
r = ActualHeight * 2;
}
else
{
t = 0;
}
r = r / 2 - 2 * t;
top = ActualHeight / 2 + r / 2;
}
if (r < 0)
{
r = 1;
}
PieBack.Height = Canvas.ActualHeight;
PieBack.Width = Canvas.ActualWidth;
Pie.Height = Canvas.ActualHeight;
Pie.Width = Canvas.ActualWidth;
PieBack.Radius = r;
PieBack.InnerRadius = double.IsNaN(InnerRadius) ? r * .6 : InnerRadius;
PieBack.RotationAngle = 270;
PieBack.WedgeAngle = angle;
Pie.Radius = PieBack.Radius;
Pie.InnerRadius = PieBack.InnerRadius;
Pie.RotationAngle = PieBack.RotationAngle;
Pie.YOffset = top - ActualHeight / 2;
PieBack.YOffset = top - ActualHeight / 2;
Canvas.SetTop(LeftLabel, top);
Canvas.SetTop(RightLabel, top);
LeftLabel.Measure(ms);
RightLabel.Measure(ms);
Canvas.SetLeft(LeftLabel,
Canvas.ActualWidth * .5 -
(Pie.InnerRadius + (Pie.Radius - Pie.InnerRadius) * .5 + LeftLabel.DesiredSize.Width * .5));
Canvas.SetLeft(RightLabel,
Canvas.ActualWidth * .5 +
(Pie.InnerRadius + (Pie.Radius - Pie.InnerRadius) * .5 - RightLabel.DesiredSize.Width * .5));
MeasureTextBlock.FontSize = double.IsNaN(HighFontSize) ? Pie.InnerRadius * .4 : HighFontSize;
MeasureTextBlock.Text = (LabelFormatter ?? defFormatter)(Value);
MeasureTextBlock.Measure(ms);
Canvas.SetTop(MeasureTextBlock, top - MeasureTextBlock.DesiredSize.Height * (Uses360Mode ? .5 : 1));
Canvas.SetLeft(MeasureTextBlock, ActualWidth / 2 - MeasureTextBlock.DesiredSize.Width / 2);
var interpolatedColor = new Color
{
R = LinearInterpolation(FromColor.R, ToColor.R),
G = LinearInterpolation(FromColor.G, ToColor.G),
B = LinearInterpolation(FromColor.B, ToColor.B),
A = LinearInterpolation(FromColor.A, ToColor.A)
};
if (IsNew)
{
Pie.Fill = new SolidColorBrush(FromColor);
Pie.WedgeAngle = 0;
}
Pie.BeginDoubleAnimation(nameof(PieSlice.WedgeAngle), completed * angle, AnimationsSpeed);
if (GaugeActiveFill == null)
{
((SolidColorBrush)Pie.Fill).BeginColorAnimation(nameof(SolidColorBrush.Color), interpolatedColor, AnimationsSpeed);
}
else
{
Pie.Fill = GaugeActiveFill;
}
IsNew = false;
}