From d00f2268f927b8911a520702d6a972c22176be91 Mon Sep 17 00:00:00 2001
From: Cameron Taylor <cameron.taylor.ninja@gmail.com>
Date: Thu, 16 Sep 2021 12:04:46 -0400
Subject: [PATCH] spectogram visulizer in progress

---
 source/ChartingState.hx    |  4 +++
 source/SpectogramSprite.hx | 55 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 source/SpectogramSprite.hx

diff --git a/source/ChartingState.hx b/source/ChartingState.hx
index 20686d4e4..6669c2adb 100644
--- a/source/ChartingState.hx
+++ b/source/ChartingState.hx
@@ -98,6 +98,10 @@ class ChartingState extends MusicBeatState
 
 		trace(audioBuf.sampleRate);
 
+		var spec:SpectogramSprite = new SpectogramSprite();
+		spec.scrollFactor.set();
+		add(spec);
+
 		gridBG = FlxGridOverlay.create(GRID_SIZE, GRID_SIZE, GRID_SIZE * 8, GRID_SIZE * 16);
 		add(gridBG);
 
diff --git a/source/SpectogramSprite.hx b/source/SpectogramSprite.hx
new file mode 100644
index 000000000..068136cb7
--- /dev/null
+++ b/source/SpectogramSprite.hx
@@ -0,0 +1,55 @@
+package;
+
+import flixel.FlxSprite;
+import flixel.math.FlxMath;
+import flixel.math.FlxPoint;
+import flixel.util.FlxColor;
+import lime.utils.Int16Array;
+
+using flixel.util.FlxSpriteUtil;
+
+class SpectogramSprite extends FlxSprite
+{
+	public function new()
+	{
+		super();
+
+		makeGraphic(200, 200, FlxColor.BLUE);
+	}
+
+	override function update(elapsed:Float)
+	{
+		if (FlxG.sound.music != null)
+		{
+			if (FlxG.sound.music.playing)
+			{
+				FlxSpriteUtil.drawRect(this, 0, 0, width, height, FlxColor.BLUE);
+
+				@:privateAccess
+				var audioData:Int16Array = FlxG.sound.music._channel.__source.buffer.data; // jank and hacky lol!
+
+				var numSamples:Int = Std.int(audioData.length / 2);
+
+				var remappedShit:Int = Std.int(FlxMath.remapToRange(FlxG.sound.music.time, 0, FlxG.sound.music.length, 0, numSamples));
+
+				var i = remappedShit;
+
+				var prevLine:FlxPoint = new FlxPoint();
+
+				for (sample in remappedShit...remappedShit + 256)
+				{
+					var left = audioData[i] / 32767;
+					i += 2;
+
+					var remappedSample:Float = FlxMath.remapToRange(sample, remappedShit, remappedShit + 256, 0, 1);
+
+					FlxSpriteUtil.drawLine(this, prevLine.x, prevLine.y, width * remappedSample, left * height / 2 + height / 2);
+					prevLine.x = width * remappedSample;
+					prevLine.y = left * height / 2 + height / 2;
+				}
+			}
+		}
+
+		super.update(elapsed);
+	}
+}