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Update laserPointer.js to detect pointing with Leap Motion or similar

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David Rowe 2014-12-11 21:31:23 -08:00
parent fe8937e37e
commit 1ab9129616
1 changed files with 80 additions and 10 deletions
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90
examples/laserPointer.js
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@ -5,19 +5,89 @@
// Created by Clément Brisset on 7/18/14.
// Copyright 2014 High Fidelity, Inc.
//
// If using Hydra controllers, pulling the triggers makes laser pointers emanate from the respective hands.
// If using a Leap Motion or similar to control your avatar's hands and fingers, pointing with your index fingers makes
// laser pointers emanate from the respective index fingers.
//
// Distributed under the Apache License, Version 2.0.
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
var LEFT = 0;
var RIGHT = 1;
var LEFT_HAND_FLAG = 1;
var RIGHT_HAND_FLAG = 2;
var laserPointer = (function () {
function update() {
var state = ((Controller.getTriggerValue(LEFT) > 0.9) ? LEFT_HAND_FLAG : 0) +
((Controller.getTriggerValue(RIGHT) > 0.9) ? RIGHT_HAND_FLAG : 0);
MyAvatar.setHandState(state);
}
var NUM_FINGERs = 4, // Excluding thumb
fingers = [
[ "LeftHandIndex", "LeftHandMiddle", "LeftHandRing", "LeftHandPinky" ],
[ "RightHandIndex", "RightHandMiddle", "RightHandRing", "RightHandPinky" ]
];
Script.update.connect(update);
function isHandPointing(hand) {
var MINIMUM_TRIGGER_PULL = 0.9;
return Controller.getTriggerValue(hand) > MINIMUM_TRIGGER_PULL;
}
function isFingerPointing(hand) {
// Index finger is pointing if final two bones of middle, ring, and pinky fingers are > 90 degrees w.r.t. index finger
var pointing,
indexDirection,
otherDirection,
f;
pointing = true;
indexDirection = Vec3.subtract(
MyAvatar.getJointPosition(fingers[hand][0] + "4"),
MyAvatar.getJointPosition(fingers[hand][0] + "2")
);
for (f = 1; f < NUM_FINGERs; f += 1) {
otherDirection = Vec3.subtract(
MyAvatar.getJointPosition(fingers[hand][f] + "4"),
MyAvatar.getJointPosition(fingers[hand][f] + "2")
);
pointing = pointing && Vec3.dot(indexDirection, otherDirection) < 0;
}
return pointing;
}
function update() {
var LEFT_HAND = 0,
RIGHT_HAND = 1,
LEFT_HAND_POINTING_FLAG = 1,
RIGHT_HAND_POINTING_FLAG = 2,
FINGER_POINTING_FLAG = 4,
handState;
handState = 0;
if (isHandPointing(LEFT_HAND)) {
handState += LEFT_HAND_POINTING_FLAG;
}
if (isHandPointing(RIGHT_HAND)) {
handState += RIGHT_HAND_POINTING_FLAG;
}
if (handState === 0) {
if (isFingerPointing(LEFT_HAND)) {
handState += LEFT_HAND_POINTING_FLAG;
}
if (isFingerPointing(RIGHT_HAND)) {
handState += RIGHT_HAND_POINTING_FLAG;
}
if (handState !== 0) {
handState += FINGER_POINTING_FLAG;
}
}
MyAvatar.setHandState(handState);
}
return {
update: update
};
}());
Script.update.connect(laserPointer.update);