ELK/Furnace/FurnaceUI/Controls/Common/MirrorCanvas.cs

using System;
using System.Globalization;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace FurnaceUI.Controls.Common
{
    public class MirrorCanvas : Canvas
    {
        private Storyboard currentStoryboard;

        public bool ShowAxisPoint
        {
            get { return (bool)GetValue(ShowAxisPointProperty); }
            set { SetValue(ShowAxisPointProperty, value); }
        }

        // Using a DependencyProperty as the backing store for ShowAxisPoint.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ShowAxisPointProperty =
            DependencyProperty.Register("ShowAxisPoint", typeof(bool), typeof(MirrorCanvas), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));



        public static readonly DependencyProperty AxisLeftProperty;

        static MirrorCanvas()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(MirrorCanvas), new FrameworkPropertyMetadata(typeof(FlipHorizintalCanvas)));

            AxisLeftProperty = DependencyProperty.Register("AxisLeft", typeof(int), typeof(MirrorCanvas), new UIPropertyMetadata(8));
        }

        public int AxisLeft
        {
            get
            {
                return (int)GetValue(AxisLeftProperty);
            }
            set
            {
                SetValue(AxisLeftProperty, value);
            }
        }

        protected override void OnRender(DrawingContext dc)
        {
            base.OnRender(dc);

            if (ShowAxisPoint)
            {
                dc.DrawEllipse(Brushes.Black, new Pen(Brushes.White, 2), new Point(AxisLeft, Height / 2), 5, 5);
            }

            //	var text = new FormattedText(
            //CurrentAngle.ToString(),
            //CultureInfo.GetCultureInfo("en-us"),
            //FlowDirection.LeftToRight,
            //new Typeface("Verdana"),
            //14,
            //Brushes.Black);
            //	dc.DrawText(text, new Point(AxisLeft, 60));
        }

        public double CurrentAngle
        {
            get
            {
                if (RenderTransform is RotateTransform)
                {
                    return (RenderTransform as RotateTransform).Angle;
                }
                return 0;
            }
        }

        public void Rotate(int angle, bool absolute = true, int ms = 0, double accelerationRatio = 0, double decelerationRatio = 0, Action onComplete = null)
        {
            var storyboard = new Storyboard();
            storyboard.Completed += (s, e) => onComplete?.Invoke();
            if (Rotate(storyboard, angle, absolute, ms, accelerationRatio, decelerationRatio, onComplete))
            {
                storyboard.Begin();
            }
            else
            {
                onComplete?.Invoke();
            }
        }

        public double oldScale = 0;

        public bool Rotate(Storyboard storyboard, int angle, bool absolute = true, int ms = 0, double accelerationRatio = 0, double decelerationRatio = 0, Action onComplete = null)
        {
            //var oldAngle = 0d;
            //if (RenderTransform is RotateTransform)
            //{
            //    oldAngle = (RenderTransform as RotateTransform).Angle;
            //}

            //var newAngle = absolute ? angle : oldAngle + angle;

            //if (newAngle == oldAngle)
            //{
            //    return false;
            //}

            //var top = Height / 2;
            //var leftPoint = new Point(AxisLeft, top);

            //if (ms <= 0)
            //{
            //    RenderTransform = new RotateTransform(newAngle, leftPoint.X, leftPoint.Y);

            //    return false;
            //    //InvalidateVisual();
            //}
            //else
            //{
            //    //var rotateTransform = new RotateTransform();
            //    //rotateTransform.CenterX = leftPoint.X;
            //    //rotateTransform.CenterY = leftPoint.Y;
            //    //RenderTransform = rotateTransform;
            //    //var animation = new DoubleAnimation(oldAngle, newAngle, TimeSpan.FromMilliseconds(ms));
            //    //animation.AccelerationRatio = accelerationRatio;
            //    //animation.DecelerationRatio = decelerationRatio;
            //    //storyboard.Children.Add(animation);
            //    //Storyboard.SetTarget(animation, this);
            //    //Storyboard.SetTargetProperty(animation, new PropertyPath("RenderTransform.Angle"));



            //    //return true;
            //}

            var newScale = 0.5;
            //if (angle >= 180)
            //{
            //    newScale = 1;
            //}
            if (newScale == oldScale)
            {
                return false;
            }
            ScaleTransform scaleTransform = new ScaleTransform();
            //TranslateTransform translateTransform = new TranslateTransform();
            //translateTransform.X = angle;
            scaleTransform.ScaleX = (90 - angle) / 90.0;

            //if (angle == 180)
            //{ scaleTransform.ScaleX = -1; }
            //else
            //{
            //    scaleTransform.ScaleX = 1;
            //}
            var top = Height / 2;
            var leftPoint = new Point(AxisLeft, top);
            scaleTransform.CenterX = leftPoint.X;
            scaleTransform.CenterY = leftPoint.Y;
            TransformGroup Group = new TransformGroup();
            Group.Children.Add(scaleTransform);
            RenderTransform = Group;
            var animation = new DoubleAnimation(oldScale, angle, TimeSpan.FromMilliseconds(ms));
            animation.AccelerationRatio = accelerationRatio;
            animation.DecelerationRatio = decelerationRatio;
            storyboard.Children.Add(animation);
            Storyboard.SetTarget(animation, this);
            Storyboard.SetTargetProperty(animation, new PropertyPath("RenderTransform.(TransformGroup.Children)[0].(TranslateTransform.X)"));
            oldScale = angle;
            return true;
        }


        public void Stop()
        {
            if (currentStoryboard != null)
            {
                currentStoryboard.Stop(this);
                currentStoryboard = null;
            }
        }
    }
}