+ plugins project

1 files changed, 184 insertions, 0 deletions

diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Tweening/Tween.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Tweening/Tween.cs
new file mode 100644
index 0000000..ad29251
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Tweening/Tween.cs
@@ -0,0 +1,184 @@
+using System;
+using Microsoft.Xna.Framework;
+
+namespace MonoGame.Extended.Tweening
+{
+    public abstract class Tween<T> : Tween
+        where T : struct
+    {
+        internal Tween(object target, float duration, float delay, TweenMember<T> member, T endValue)
+            : base(target, duration, delay)
+        {
+            Member = member;
+            _endValue = endValue;
+        }
+
+        public TweenMember<T> Member { get; }
+        public override string MemberName => Member.Name;
+
+        protected T _startValue;
+        protected T _endValue;
+
+        protected override void Initialize()
+        {
+            _startValue = Member.Value;
+        }
+
+        protected override void Swap()
+        {
+            _endValue = _startValue;
+            Initialize();
+        }
+    }
+
+    public abstract class Tween
+    {
+        internal Tween(object target, float duration, float delay)
+        {
+            Target = target;
+            Duration = duration;
+            Delay = delay;
+            IsAlive = true;
+
+            _remainingDelay = delay;
+        }
+
+        public object Target { get; }
+        public abstract string MemberName { get; }
+        public float Duration { get; }
+        public float Delay { get; }
+        public bool IsPaused { get; set; }
+        public bool IsRepeating => _remainingRepeats != 0;
+        public bool IsRepeatingForever => _remainingRepeats < 0;
+        public bool IsAutoReverse { get; private set; }
+        public bool IsAlive { get; private set; }
+        public bool IsComplete { get; private set; }
+        public float TimeRemaining => Duration - _elapsedDuration;
+        public float Completion => MathHelper.Clamp(_completion, 0, 1);
+
+        private Func<float, float> _easingFunction;
+        private bool _isInitialized;
+        private float _completion;
+        private float _elapsedDuration;
+        private float _remainingDelay;
+        private float _repeatDelay;
+        private int _remainingRepeats;
+        private Action<Tween> _onBegin;
+        private Action<Tween> _onEnd;
+
+        public Tween Easing(Func<float, float> easingFunction) { _easingFunction = easingFunction; return this; }
+        public Tween OnBegin(Action<Tween> action) { _onBegin = action; return this; }
+        public Tween OnEnd(Action<Tween> action) { _onEnd = action; return this; }
+        public Tween Pause() { IsPaused = true; return this; }
+        public Tween Resume() { IsPaused = false; return this; }
+
+        public Tween Repeat(int count, float repeatDelay = 0f)
+        {
+            _remainingRepeats = count;
+            _repeatDelay = repeatDelay;
+            return this;
+        }
+
+        public Tween RepeatForever(float repeatDelay = 0f)
+        {
+            _remainingRepeats = -1;
+            _repeatDelay = repeatDelay;
+            return this;
+        }
+
+        public Tween AutoReverse()
+        {
+            if (_remainingRepeats == 0)
+                _remainingRepeats = 1;
+
+            IsAutoReverse = true;
+            return this;
+        }
+
+        protected abstract void Initialize();
+        protected abstract void Interpolate(float n);
+        protected abstract void Swap();
+
+        public void Cancel()
+        {
+            _remainingRepeats = 0;
+            IsAlive = false;
+        }
+
+        public void CancelAndComplete()
+        {
+            if (IsAlive)
+            {
+                _completion = 1;
+
+                Interpolate(1);
+                IsComplete = true;
+                _onEnd?.Invoke(this);
+            }
+
+            Cancel();
+        }
+
+        public void Update(float elapsedSeconds)
+        {
+            if(IsPaused || !IsAlive)
+                return;
+
+            if (_remainingDelay > 0)
+            {
+                _remainingDelay -= elapsedSeconds;
+
+                if (_remainingDelay > 0)
+                    return;
+            }
+
+            if (!_isInitialized)
+            {
+                _isInitialized = true;
+                Initialize();
+                _onBegin?.Invoke(this);
+            }
+
+            if (IsComplete)
+            {
+                IsComplete = false;
+                _elapsedDuration = 0;
+                _onBegin?.Invoke(this);
+
+                if (IsAutoReverse)
+                    Swap();
+            }
+
+            _elapsedDuration += elapsedSeconds;
+
+            var n = _completion = _elapsedDuration / Duration;
+
+            if (_easingFunction != null)
+                n = _easingFunction(n);
+
+            if (_elapsedDuration >= Duration)
+            {
+                if (_remainingRepeats != 0)
+                {
+                    if(_remainingRepeats > 0)
+                        _remainingRepeats--;
+
+                    _remainingDelay = _repeatDelay;
+                }
+                else if (_remainingRepeats == 0)
+                {
+                    IsAlive = false;
+                }
+
+                n = _completion = 1;
+                IsComplete = true;
+            }
+
+            Interpolate(n);
+
+            if (IsComplete)
+                _onEnd?.Invoke(this);
+        }
+
+    }
+}