maint: added livewatch asset

Assets/Plugins/LiveWatchLite/TowerDefenceDemo/Scripts/UI/HealthPanelUI.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Ingvar.LiveWatch.TowerDefenceDemo.UI
+{
+    public class HealthPanelUI : MonoBehaviour
+    {
+        [SerializeField] private float animationExtraScale = 0.2f;
+        [SerializeField] private float animationScaleDuration = 0.2f;
+        [SerializeField] private Text healthText;
+
+        private LevelScene _levelScene;
+
+        private void Awake()
+        {
+            _levelScene = FindObjectOfType<LevelScene>();
+        }
+        
+        private void OnEnable()
+        {
+            _levelScene.HealthManager.HealthChanged += OnHealthChanged;
+            RefreshHealth(false);
+        }
+
+        private void OnDisable()
+        {
+            _levelScene.HealthManager.HealthChanged -= OnHealthChanged;
+        }
+
+        private void OnHealthChanged()
+        {
+            RefreshHealth();
+        }
+        
+        private void RefreshHealth(bool animate = true)
+        {
+            healthText.text = $"{_levelScene.HealthManager.CurrentHealth}";
+
+            if (animate)
+            {
+                StopAllCoroutines();
+                StartCoroutine(AnimateChange());
+            }
+        }
+
+        private IEnumerator AnimateChange()
+        {
+            healthText.transform.localScale = Vector3.one;
+            
+            var zoomOutTime = 0f;
+            while (zoomOutTime <= animationScaleDuration)
+            {
+                yield return new WaitForEndOfFrame();
+                zoomOutTime += Time.deltaTime;
+                var progress = Mathf.Clamp01(Mathf.InverseLerp(0, animationScaleDuration, zoomOutTime));
+                healthText.transform.localScale = (1 + progress * animationExtraScale) * Vector3.one;
+            }
+            
+            var zoomInTime = 0f;
+            while (zoomInTime <= animationScaleDuration)
+            {
+                yield return new WaitForEndOfFrame();
+                zoomInTime += Time.deltaTime;
+                var progress = Mathf.Clamp01(Mathf.InverseLerp(0, animationScaleDuration, zoomInTime));
+                healthText.transform.localScale = (1 + animationExtraScale - progress * animationExtraScale) * Vector3.one;
+            }
+
+            healthText.transform.localScale = Vector3.one;
+        }
+    }
+}