more work on the ui theme and changing the hud

UI/EnemyHealthBar/health_bar.gd

@@ -0,0 +1,28 @@
+class_name HealthBar
+extends TextureProgressBar
+
+@export var health_bar_gradient: Gradient
+
+@onready var prev_bar: TextureProgressBar = $PreviousHealthBar
+
+
+func setup(health: float) -> void:
+	max_value = health
+	value = health
+	prev_bar.max_value = health
+	prev_bar.value = health
+
+
+func on_health_changed(health: float) -> void:
+	set_visible(true)
+	var health_went_down: bool = true if health < value else false
+	value = health
+	tint_progress = health_bar_gradient.sample(value / max_value)
+	if health_went_down:
+		var tween: Tween = create_tween()
+		tween.set_ease(Tween.EASE_OUT)
+		tween.set_trans(Tween.TRANS_QUINT)
+		tween.tween_interval(0.3)
+		tween.tween_property(prev_bar, "value", value, 0.7)
+	else:
+		prev_bar.value = value