Create smooth stream of symbols

Assets/JustSign/Scripts/JustSignController.cs

@@ -1,9 +1,18 @@
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
+using UnityEngine.UI;
 
+/// <summary>
+/// Contains all game logic for the JustSign game
+/// </summary>
 public class JustSignController : MonoBehaviour
 {   
+    /// <summary>
+    /// The canvas containing all components
+    /// </summary>
+    public Canvas canvas;
+
     /// <summary>
     /// All of the words that can be used in this session
     /// </summary>
@@ -19,23 +28,79 @@ public class JustSignController : MonoBehaviour
     /// </summary>
     private Theme currentTheme;
 
+    /// <summary>
+    /// List of strings representing all words on the track
+    /// </summary>
+    private List<string> activeWords = new List<string>();
+
+    /// <summary>
+    /// List of objects representing all symbols on the track
+    /// </summary>
+    private List<GameObject> activeSymbols = new List<GameObject>();
+
+    /// <summary>
+    /// Width and height of the symbols
+    /// </summary>
+    private int symbolSize = 280;
+
+    /// <summary>
+    /// Controls movement speed of symbols (higher -> faster)
+    /// </summary>
+    private int moveSpeed = 200;
+    
+    /// <summary>
+    /// Starting X-coordinate of a symbol = (-1920 - symbolsize) / 2
+    /// </summary>
+    private int trackX = -1100;
+
+    /// <summary>
+    /// Starting Y-coordinate of a symbol
+    /// </summary>
+    private int trackY = -200;
+
+    /// <summary>
+    /// Time at which the last symbol was spawned
+    /// </summary>
+    private float lastSpawn;
+
     // Start is called before the first frame update
     void Start()
     {   
         themeList = ThemeLoader.LoadJson();
         currentTheme = FindThemeByName(PlayerPrefs.GetString("themeName"));
         words = currentTheme.words;
-        /*
-        RectTransform rectTransform = newImage.GetComponent<RectTransform>();
-        rectTransform.localPosition = new Vector3(xPosition, yPosition, 0);
-        rectTransform.sizeDelta = new Vector2(width, height);
-        */
+        lastSpawn = Time.time;
+        
+        SpawnNewSymbol();
     }
 
     // Update is called once per frame
     void Update()
-    {
-        
+    {   
+        float currentTime = Time.time;
+        if (currentTime - lastSpawn > 1) {
+            lastSpawn = currentTime;
+            SpawnNewSymbol();
+        }
+
+        if (activeSymbols[0].GetComponent<RectTransform>().localPosition.x > -trackX) {
+            Debug.Log("LENGTH BEFORE:");
+            Debug.Log(activeWords.Count);
+            activeWords.RemoveAt(0);
+            Debug.Log("LENGTH AFTER:");
+            Debug.Log(activeWords.Count);
+            GameObject symbol = activeSymbols[0];
+            activeSymbols.RemoveAt(0);
+            Destroy(symbol);
+        }
+
+        //Debug.Log(activeWords.Count);
+        Debug.Log(activeWords.Count);
+
+        foreach (GameObject symbol in activeSymbols) {
+            RectTransform rectTransform = symbol.GetComponent<RectTransform>();
+            rectTransform.localPosition = new Vector3(rectTransform.localPosition.x + Time.deltaTime * moveSpeed, trackY, 0);
+        }
     }
 
     /// <summary>
@@ -60,4 +125,26 @@ public class JustSignController : MonoBehaviour
         Debug.Log("Requested theme not found");
         return null;
     }
+
+    /// <summary>
+    /// Create a new symbol at the start of the track
+    /// </summary>
+    void SpawnNewSymbol() {
+        string nextSymbol = words[UnityEngine.Random.Range(0, words.Length)];
+
+        GameObject newSymbolObject = new GameObject("Symbol");
+        Image newImage = newSymbolObject.AddComponent<Image>();
+        RectTransform rectTransform = newSymbolObject.GetComponent<RectTransform>();
+        rectTransform.SetParent(canvas.transform, false); // Set the parent to the Canvas
+        rectTransform.localPosition = new Vector3(trackX, trackY, 0);
+        rectTransform.sizeDelta = new Vector2(symbolSize, symbolSize);
+
+        Sprite sprite = Resources.Load<Sprite>("Common/Images/" + nextSymbol);
+
+        // Set the new sprite as the Image component's source image
+        newImage.sprite = sprite;
+
+        activeWords.Add(nextSymbol);
+        activeSymbols.Add(newSymbolObject);
+    }
 }