private static void OnFaceChanged(DependencyObject d)
{
CircularSlider radialGauge = (CircularSlider)d;
var container = radialGauge.GetTemplateChild(ContainerPartName) as Grid;
if (container == null || ControlHelpers.IsRunningInLegacyDesignerMode)
{
// Bad template.
return;
}
radialGauge._root = container.GetVisual();
radialGauge._root.Children.RemoveAll();
radialGauge._compositor = radialGauge._root.Compositor;
// Ticks.
SpriteVisual tick;
for (double i = radialGauge.Minimum; i <= radialGauge.Maximum; i += radialGauge.TickSpacing)
{
tick = radialGauge._compositor.CreateSpriteVisual();
tick.Size = new Vector2((float)radialGauge.TickWidth, (float)radialGauge.TickLength);
tick.Brush = radialGauge._compositor.CreateColorBrush(radialGauge.TickBrush.Color);
tick.Offset = new Vector3(100 - ((float)radialGauge.TickWidth / 2), 0.0f, 0);
tick.CenterPoint = new Vector3((float)radialGauge.TickWidth / 2, 100.0f, 0);
tick.RotationAngleInDegrees = (float)radialGauge.ValueToAngle(i);
radialGauge._root.Children.InsertAtTop(tick);
}
// Scale Ticks.
for (double i = radialGauge.Minimum; i <= radialGauge.Maximum; i += radialGauge.TickSpacing)
{
tick = radialGauge._compositor.CreateSpriteVisual();
tick.Size = new Vector2((float)radialGauge.ScaleTickWidth, (float)radialGauge.ScaleWidth);
tick.Brush = radialGauge._compositor.CreateColorBrush(radialGauge.ScaleTickBrush.Color);
tick.Offset = new Vector3(100 - ((float)radialGauge.ScaleTickWidth / 2), (float)radialGauge.ScalePadding, 0);
tick.CenterPoint = new Vector3((float)radialGauge.ScaleTickWidth / 2, 100 - (float)radialGauge.ScalePadding, 0);
tick.RotationAngleInDegrees = (float)radialGauge.ValueToAngle(i);
radialGauge._root.Children.InsertAtTop(tick);
}
// Needle.
radialGauge._needle = radialGauge._compositor.CreateSpriteVisual();
radialGauge._needle.Size = new Vector2((float)radialGauge.NeedleWidth, (float)radialGauge.NeedleLength);
radialGauge._needle.Brush = radialGauge._compositor.CreateColorBrush(radialGauge.NeedleBrush.Color);
radialGauge._needle.CenterPoint = new Vector3((float)radialGauge.NeedleWidth / 2, (float)radialGauge.NeedleLength, 0);
radialGauge._needle.Offset = new Vector3(100 - ((float)radialGauge.NeedleWidth / 2), 100 - (float)radialGauge.NeedleLength, 0);
radialGauge._root.Children.InsertAtTop(radialGauge._needle);
OnValueChanged(radialGauge);
}
private static void OnScaleChanged(DependencyObject d)
{
CircularSlider radialGauge = (CircularSlider)d;
radialGauge.UpdateNormalizedAngles();
var scale = radialGauge.GetTemplateChild(ScalePartName) as Path;
if (scale != null)
{
if (radialGauge.NormalizedMaxAngle - radialGauge.NormalizedMinAngle == 360)
{
// Draw full circle.
var eg = new EllipseGeometry();
eg.Center = new Point(100, 100);
eg.RadiusX = 100 - radialGauge.ScalePadding - (radialGauge.ScaleWidth / 2);
eg.RadiusY = eg.RadiusX;
scale.Data = eg;
}
else
{
// Draw arc.
var pg = new PathGeometry();
var pf = new PathFigure();
pf.IsClosed = false;
var middleOfScale = 100 - radialGauge.ScalePadding - (radialGauge.ScaleWidth / 2);
pf.StartPoint = radialGauge.ScalePoint(radialGauge.NormalizedMinAngle, middleOfScale);
var seg = new ArcSegment();
seg.SweepDirection = SweepDirection.Clockwise;
seg.IsLargeArc = radialGauge.NormalizedMaxAngle > (radialGauge.NormalizedMinAngle + 180);
seg.Size = new Size(middleOfScale, middleOfScale);
seg.Point = radialGauge.ScalePoint(radialGauge.NormalizedMaxAngle, middleOfScale);
pf.Segments.Add(seg);
pg.Figures.Add(pf);
scale.Data = pg;
}
if (!ControlHelpers.IsRunningInLegacyDesignerMode)
{
OnFaceChanged(radialGauge);
}
}
}
private static void OnValueChanged(DependencyObject d)
{
CircularSlider radialGauge = (CircularSlider)d;
if (!double.IsNaN(radialGauge.Value))
{
if (radialGauge.StepSize != 0)
{
radialGauge.Value = radialGauge.RoundToMultiple(radialGauge.Value, radialGauge.StepSize);
}
var middleOfScale = 100 - radialGauge.ScalePadding - (radialGauge.ScaleWidth / 2);
var valueText = radialGauge.GetTemplateChild(ValueTextPartName) as TextBlock;
radialGauge.ValueAngle = radialGauge.ValueToAngle(radialGauge.Value);
// Needle
if (radialGauge._needle != null)
{
radialGauge._needle.RotationAngleInDegrees = (float)radialGauge.ValueAngle;
}
// Trail
var trail = radialGauge.GetTemplateChild(TrailPartName) as Path;
if (trail != null)
{
if (radialGauge.ValueAngle > radialGauge.NormalizedMinAngle)
{
trail.Visibility = Visibility.Visible;
if (radialGauge.ValueAngle - radialGauge.NormalizedMinAngle == 360)
{
// Draw full circle.
var eg = new EllipseGeometry();
eg.Center = new Point(100, 100);
eg.RadiusX = 100 - radialGauge.ScalePadding - (radialGauge.ScaleWidth / 2);
eg.RadiusY = eg.RadiusX;
trail.Data = eg;
}
else
{
// Draw arc.
var pg = new PathGeometry();
var pf = new PathFigure();
pf.IsClosed = false;
pf.StartPoint = radialGauge.ScalePoint(radialGauge.NormalizedMinAngle, middleOfScale);
var seg = new ArcSegment();
seg.SweepDirection = SweepDirection.Clockwise;
seg.IsLargeArc = radialGauge.ValueAngle > (180 + radialGauge.NormalizedMinAngle);
seg.Size = new Size(middleOfScale, middleOfScale);
seg.Point = radialGauge.ScalePoint(Math.Min(radialGauge.ValueAngle, radialGauge.NormalizedMaxAngle), middleOfScale); // On overflow, stop trail at MaxAngle.
pf.Segments.Add(seg);
pg.Figures.Add(pf);
trail.Data = pg;
}
}
else
{
trail.Visibility = Visibility.Collapsed;
}
}
// Value Text
if (valueText != null)
{
valueText.Text = radialGauge.Value.ToString(radialGauge.ValueStringFormat);
}
}
}