Function computeIntervalInputData

docs/app/js/sanddance-app.js:92927–92949

* velocity is calculated every x ms * @param {Object} session * @param {Object} input

(session, input)

 * @param {Object} session
 * @param {Object} input
 */ function computeIntervalInputData(session, input) {
        var last = session.lastInterval || input, deltaTime = input.timeStamp - last.timeStamp, velocity, velocityX, velocityY, direction;
        if (input.eventType != INPUT_CANCEL && (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined)) {
            var deltaX = input.deltaX - last.deltaX;
            var deltaY = input.deltaY - last.deltaY;
            var v = getVelocity(deltaTime, deltaX, deltaY);
            velocityX = v.x;
            velocityY = v.y;
            velocity = abs(v.x) > abs(v.y) ? v.x : v.y;
            direction = getDirection(deltaX, deltaY);
            session.lastInterval = input;
        } else {
            // use latest velocity info if it doesn't overtake a minimum period
            velocity = last.velocity;
            velocityX = last.velocityX;
            velocityY = last.velocityY;
            direction = last.direction;
        }
        input.velocity = velocity;
        input.velocityX = velocityX;
        input.velocityY = velocityY;
        input.direction = direction;
    }
    /**
 * create a simple clone from the input used for storage of firstInput and firstMultiple
 * @param {Object} input