WheelViewLib/src/main/java/com/lukedeighton/wheelview/WheelView.java
private void update(float deltaTime) {
        float vel = mAngularVelocity;
        float velSqr = vel*vel;
        if (vel > 0f) {
            //TODO the damping is not based on time
            mAngularVelocity -= velSqr * VELOCITY_FRICTION_COEFFICIENT + CONSTANT_FRICTION_COEFFICIENT;
            if (mAngularVelocity < 0f) mAngularVelocity = 0f;
        } else if (vel < 0f) {
            mAngularVelocity -= velSqr * -VELOCITY_FRICTION_COEFFICIENT - CONSTANT_FRICTION_COEFFICIENT;
            if (mAngularVelocity > 0f) mAngularVelocity = 0f;
        }

        if (mAngularVelocity != 0f) {
            addAngle(mAngularVelocity * deltaTime);
        } else {
            mRequiresUpdate = false;
        }
    }
private void update(float deltaTime) {
        float vel = mAngularVelocity;
        float velSqr = vel*vel;
        if (vel > 0f) {
            //TODO the damping is not based on time
            mAngularVelocity -= velSqr * VELOCITY_FRICTION_COEFFICIENT + CONSTANT_FRICTION_COEFFICIENT;
            if (mAngularVelocity < 0f) mAngularVelocity = 0f;
        } else if (vel < 0f) {
            mAngularVelocity -= velSqr * -VELOCITY_FRICTION_COEFFICIENT - CONSTANT_FRICTION_COEFFICIENT;
            if (mAngularVelocity > 0f) mAngularVelocity = 0f;
        }

        if (mAngularVelocity != 0f) {
            addAngle(mAngularVelocity * deltaTime);
        } else {
            mRequiresUpdate = false;
        }
    }
Estimates the wheel's new angle and angular velocity