Explosion, pressure plate, bomb ice in place

Assets/Scripts/PressurePlate.cs

@@ -0,0 +1,42 @@
+ using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class PressurePlate : MonoBehaviour {
+	SpriteRenderer spriteRenderer;
+
+	public bool pressed;
+	public Sprite alternateSprite;
+
+	GameObject presser;
+
+	void Awake() {
+		spriteRenderer = GetComponent<SpriteRenderer> ();
+	}
+
+	void OnTriggerEnter2D(Collider2D collider) {
+		GameObject go = collider.gameObject;
+
+		if (go.GetComponent<Player>() != null || go.GetComponent<BlockIce>() != null || go.GetComponent<Bomb>() != null) {
+			if (presser == null) {
+				presser = go;
+				pressed = true;
+				SwitchSprite ();
+			}
+		}
+	}
+
+	void OnTriggerExit2D(Collider2D collider) {
+		if (collider.gameObject == presser) {
+			presser = null;
+			pressed = false;
+			SwitchSprite ();
+		}
+	}
+
+	void SwitchSprite() {
+		Sprite spr = spriteRenderer.sprite;
+		spriteRenderer.sprite = alternateSprite;
+		alternateSprite = spr;
+	}
+}