Spawn a SortableDictionary at specific time

Hello fellow Unity devs,
i am currently working on a Rhythm Game Project and need your help.

I have hand-mapped all notes into a SortableDictionary and saved that.
In my "Ingame" Scene I load the file and add the notes to a SortableDictionary again.
I now have this Object:

TIME (Time.time normalized), NOTE (1-5)

What I now want to do is detect when a note should spawn and Instiate a NoteObject at the top of my screen. I have the problem to check if the current time matches a time in the SortableDictionary.

My PlayManager

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using System;
5. using System.IO;
6.  
7. public class PlayManager : MonoBehaviour {
8.  
9.     public bool isPlaying = false;
10.     public float playingTime = 0f;
11.     public float playingStartedTime = 0f;
12.     AudioSource audioSource;
13.     SortedDictionary<float, float> notesTable;
14.  
15.     public void Start()
16.     {
17.         // Setup the file
18.         Debug.Log("Loading Song: " + PlayerPrefs.GetString("selectedSong"));
19.         audioSource = GetComponent<AudioSource>();
20.         audioSource.clip = Resources.Load("Songs/" + PlayerPrefs.GetString("selectedSong")) as AudioClip;
21.  
22.         // Setup the notes
23.         Debug.Log("Loading Song Notes: " + PlayerPrefs.GetString("selectedSong") + ".song");
24.         notesTable = new SortedDictionary<float, float>();
25.  
26.         String fileName = "Assets/Resources/Songs/" + PlayerPrefs.GetString("selectedSong") + ".song";
27.         if (File.Exists(fileName))
28.         {
29.             var sr = File.OpenText(fileName);
30.             var line = sr.ReadLine();
31.             while (line != null)
32.             {
33.                 try
34.                 {
35.                     String[] splitLine = line.Split("|".ToCharArray());
36.                     splitLine[1] = splitLine[1];
37.                     notesTable.Add(float.Parse(splitLine[0]), float.Parse(splitLine[1]));
38.                 } catch(IndexOutOfRangeException ioore)
39.                 {
40.                     String[] splitVersion = line.Split("-".ToCharArray());
41.                     Debug.Log("Using SONGNOTES Version: " + splitVersion[1]);
42.                 }
43.                 line = sr.ReadLine();
44.             }
45.  
46.             // DEBUG OUTPUT ALL NOTES
47.             foreach(KeyValuePair<float, float> note in notesTable)
48.             {
49.                 Debug.Log(note.Key + " - " + note.Value);
50.             }
51.         } else
52.         {
53.             Debug.Log("CRITICAL ERROR! Could not find Song file!");
54.             return;
55.         }
56.  
57.         // Start Countdown
58.         StartCoroutine("startSong");
59.     }
60.  
61.     public void Update()
62.     {
63.         if (isPlaying)
64.         {
65.             playingTime = Time.time - playingStartedTime;
66.  
67.             // DETECT NOTE AND SPAWN NOTEOBJECT
68.         }
69.     }
70.  
71.     public void startPlaying()
72.     {
73.         playingStartedTime = Time.time;
74.         playingTime = 0;
75.         isPlaying = true;
76.         audioSource.Play();
77.         Debug.Log("Started Playing at" + playingStartedTime);
78.     }
79.     public void stopPlaying()
80.     {
81.         playingStartedTime = Time.time;
82.         isPlaying = false;
83.         audioSource.Stop();
84.         Debug.Log("Stopped Playing at " + playingStartedTime);
85.     }
86.  
87.     IEnumerator startSong()
88.     {
89.         yield return new WaitForSeconds(1f);
90.         Debug.Log("Play in 3 Seconds!");
91.         yield return new WaitForSeconds(1f);
92.         Debug.Log("Play in 2 Seconds!");
93.         yield return new WaitForSeconds(1f);
94.         Debug.Log("Play in 1 Second!");
95.         yield return new WaitForSeconds(1f);
96.         startPlaying();
97.     }
98. }
99.  

A sample song file

Code (CSharp):

1. SONGNOTES-1.0.0
2. 2.435412|2
3. 2.799766|4
4. 3.314533|2
5. 3.562937|4
6. 3.81162|1
7. 4.225603|2
8. 4.739169|4
9. 4.971102|2
10. 5.23617|4
11. 5.502206|1
12. 6.263303|2
13. 6.72717|4
14. 7.240736|1
15. 7.489878|4
16. 7.737736|1
17. 8.21817|5
18. 9.278503|4
19. 9.477352|1
20. 9.560068|4
21. 9.709745|1
22. 9.842085|4
23. 10.10677|1
24. 10.45507|2
25. 10.83601|4
26. 11.26644|2
27. 11.51497|4
28. 11.74687|2
29. 12.17819|1
30. 12.77437|4
31. 12.98937|1
32. 13.23833|2
33. 13.48637|4
34. 14.19908|2
35. 14.6792|4
36. 15.24244|2
37. 15.47437|4
38. 15.73993|2
39. 16.253|5
40. 18.27414|4
41. 18.62204|1
42. 18.80433|4
43. 19.01964|1
44. 19.99707|4
45. 20.26219|4
46. 20.5272|4
47. 20.79263|1
48. 21.04077|2
49. 22.44894|2
50. 22.714|2
51. 22.94594|2
52. 23.19444|1
53. 23.42637|2
54. 23.9565|3
55. 26.47464|4
56. 26.69|3
57. 26.9882|4
58. 27.23677|3
59. 28.16479|1
60. 28.69457|2
61. 28.95963|1
62. 29.24129|2
63. 30.23527|4
64. 30.69944|1
65. 31.22927|4
66. 32.2067|5
67. 32.68714|3
68. 33.21727|5
69. 34.31067|2
70. 34.7414|1
71. 35.20527|2
72. 35.45382|1
73. 35.75197|4
74. 36.31524|1
75. 36.79567|2
76. 37.04417|4
77. 37.30923|1
78. 37.47509|2
79. 38.2701|4
80. 38.75084|2
81. 39.24754|1
82. 39.49606|2
83. 39.82739|1
84. 40.22497|4
85. 41.28754|4
86. 41.45305|2
87. 41.53628|4
88. 41.65185|2
89. 41.75125|4
90. 41.93348|2
91. 42.13241|4
92. 42.38078|1
93. 42.74525|4
94. 43.25882|2
95. 43.47419|4
96. 43.72268|1
97. 44.26947|5
98. 44.78295|4
99. 45.04802|1
100. 45.44562|2
101. 45.66098|4
102. 46.27395|4
103. 46.73794|1
104. 47.23491|4
105. 47.41705|1
106. 47.71532|4
107. 48.17912|5
108. 50.29983|3
109. 50.82986|3
110. 51.32711|4
111. 51.57538|4
112. 51.80722|4
113. 52.23795|1
114. 52.80122|4
115. 53.04972|1
116. 53.26508|4
117. 53.53015|1
118. 53.76208|2
119. 54.02752|4
120. 54.27565|1
121. 54.50758|2
122. 54.70639|4
123. 55.05436|2
124. 55.28622|4
125. 55.36905|2
126. 55.63412|4
127. 56.03193|1
128. 56.28022|5
129. 58.28479|2
130. 58.78178|1
131. 59.26221|2
132. 59.52733|1
133. 59.77579|4
134. 60.25622|2
135. 60.85262|2
136. 61.08455|4
137. 61.33305|1
138. 61.54847|2
139. 62.29394|4
140. 62.82405|1
141. 63.32105|4
142. 63.53642|1
143. 63.76835|2
144. 64.29856|5
145.  

 

Code (CSharp):

1. using System.Linq;
2. private float currentTime = 0;
3. public void Update()
4.     {
5.         if (isPlaying)
6.         {
7.             playingTime = Time.time - playingStartedTime;
8.             var kvp = notes.Where(x => x.Key < playingTime).LastOrDefault();
9.             if (kvp != null)
10.             {
11.                 if (kvp.Key != currentTime)
12.                 {
13.                       currentTime = kvp.Key;
14.                       InstantiateNote(kvp.Value);
15.                 }
16.            }
17.         }
18.     }
19. public void InstantiateNote(float value)
20. {
21.       // Code here to spawn a note
22. }
23. public void startPlaying()
24. {
25.        currentTime  = 0;
26.        //rest of the code
27. }
28.  
29.  

I would also add a final time code to all your songs with a note value of -1. Then InstantiateNote can call stopPlaying when it receives a -1 for a note

Basically that LinQ line searches through the dictionary for all the notes that are less than currentTime. Find the last one. Checks if its different than our stored last currentTime. If it is we hit a new note so we instantiate it and update our currentTime (so we don't keep spawning the same note over and over)