From 5d9cf23ac564953ed10d6daabb035a05be8b8355 Mon Sep 17 00:00:00 2001
From: Philip Rosedale <philip@highfidelity.io>
Date: Wed, 22 Jan 2014 08:38:45 -0800
Subject: [PATCH] Added drumSticks example script

---
 examples/drumStick.js | 78 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 examples/drumStick.js

diff --git a/examples/drumStick.js b/examples/drumStick.js
new file mode 100644
index 0000000000..6db9bae365
--- /dev/null
+++ b/examples/drumStick.js
@@ -0,0 +1,78 @@
+//
+//  This sample script watches your hydra hands and makes clapping sound when they come close together fast 
+//
+
+function length(v) {
+    return Math.sqrt(v.x * v.x + v.y * v.y + v.z * v.z);
+}
+
+
+function printVector(v) {
+	print(v.x + ", " + v.y + ", " + v.z + "\n");
+}
+
+function vMinus(a, b) { 
+	var rval = { x: a.x - b.x, y: a.y - b.y, z: a.z - b.z };
+	return rval;
+}
+
+//  First, load two percussion sounds to be used on the sticks
+
+//var drum1 = new Sound("http://public.highfidelity.io/sounds/Colissions-hitsandslaps/Hit1.raw");
+var drum1 = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/MusicalInstruments/drums/snare.raw");
+var drum2 = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/MusicalInstruments/drums/snare.raw");
+
+//  State = 
+//  0 = not triggered 
+//  1 = triggered, waiting to stop to play sound
+var state = new Array();
+state[0] = 0; 
+state[1] = 0; 
+var strokeSpeed = new Array();
+strokeSpeed[0] = 0.0; 
+strokeSpeed[1] = 0.0; 
+
+function checkSticks() {
+	//  Set the location and other info for the sound to play
+
+	for (var palm = 0; palm < 2; palm++) {
+		var palmVelocity = Controller.getSpatialControlVelocity(palm * 2 + 1);
+		var speed = length(palmVelocity);
+		
+		//  lower trigger speed let you 'drum' more slowly. 
+		const TRIGGER_SPEED = 0.30;
+		const STOP_SPEED = 0.01; 
+		const GAIN = 0.5;
+		const AVERAGING = 0.2;
+
+		//   Measure trailing average stroke speed to ultimately set volume
+		strokeSpeed[palm] = (1.0 - AVERAGING) * strokeSpeed[palm] + AVERAGING * (speed * GAIN);
+
+		if (state[palm] == 0) {
+			//  Waiting for downward speed to indicate stroke
+			if ((palmVelocity.y < 0.0) && (strokeSpeed[palm] > TRIGGER_SPEED)) {
+				state[palm] = 1;
+				print("waiting\n");
+			}
+		} else if (state[palm] == 1) {
+			//   Waiting for change in velocity direction or slowing to trigger drum sound
+			if ((palmVelocity.y > 0.0) || (speed < STOP_SPEED)) {
+				state[palm] = 0;
+				print("boom, volume = " + strokeSpeed[palm] + "\n");
+				var options = new AudioInjectionOptions();

+				options.position = Controller.getSpatialControlPosition(palm * 2 + 1);
+				if (strokeSpeed[palm] > 1.0) { strokeSpeed[palm] = 1.0; }
+				options.volume = strokeSpeed[palm];
+
+				if (palm == 0) {
+					Audio.playSound(drum1, options);
+				} else {
+					Audio.playSound(drum2, options);
+				}
+			}
+		}
+	}
+}
+
+// Connect a call back that happens every frame
+Agent.willSendVisualDataCallback.connect(checkSticks);
\ No newline at end of file