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Merge pull request #1610 from PhilipRosedale/master

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Example script drumSticks.js lets you play air drums
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ZappoMan 2014-01-22 11:15:14 -08:00
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//
// This example musical instrument script plays 'air drums' when you move your hands downward
//
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("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 Machine:
// 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() {
for (var palm = 0; palm < 2; palm++) {
var palmVelocity = Controller.getSpatialControlVelocity(palm * 2 + 1);
var speed = length(palmVelocity);
const TRIGGER_SPEED = 0.30; // Lower this value to let you 'drum' more gently
const STOP_SPEED = 0.01; // Speed below which a sound will trigger
const GAIN = 0.5; // Loudness compared to stick velocity
const AVERAGING = 0.2; // How far back to sample trailing velocity
// 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;
}
} 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;
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);