private instantaneousPosture()

in sim/state/accelerometer.ts [206:279]
49 lines of code
24 McCabe index (conditional complexity)

        private instantaneousPosture(): number {
            let force = this.instantaneousAccelerationSquared();
            let shakeDetected = false;

            // Test for shake events.
            // We detect a shake by measuring zero crossings in each axis. In other words, if we see a strong acceleration to the left followed by
            // a string acceleration to the right, then we can infer a shake. Similarly, we can do this for each acxis (left/right, up/down, in/out).
            //
            // If we see enough zero crossings in succession (MICROBIT_ACCELEROMETER_SHAKE_COUNT_THRESHOLD), then we decide that the device
            // has been shaken.
            if ((this.getX() < -DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && this.shake.x) || (this.getX() > DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && !this.shake.x)) {
                shakeDetected = true;
                this.shake.x = !this.shake.x;
            }

            if ((this.getY() < -DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && this.shake.y) || (this.getY() > DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && !this.shake.y)) {
                shakeDetected = true;
                this.shake.y = !this.shake.y;
            }

            if ((this.getZ() < -DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && this.shake.z) || (this.getZ() > DAL.MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE && !this.shake.z)) {
                shakeDetected = true;
                this.shake.z = !this.shake.z;
            }

            if (shakeDetected && this.shake.count < DAL.MICROBIT_ACCELEROMETER_SHAKE_COUNT_THRESHOLD && ++this.shake.count == DAL.MICROBIT_ACCELEROMETER_SHAKE_COUNT_THRESHOLD)
                this.shake.shaken = 1;

            if (++this.shake.timer >= DAL.MICROBIT_ACCELEROMETER_SHAKE_DAMPING) {
                this.shake.timer = 0;
                if (this.shake.count > 0) {
                    if (--this.shake.count == 0)
                        this.shake.shaken = 0;
                }
            }

            if (this.shake.shaken)
                return DAL.MICROBIT_ACCELEROMETER_EVT_SHAKE;

            let sq = (n: number) => n * n

            if (force < sq(DAL.MICROBIT_ACCELEROMETER_FREEFALL_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_FREEFALL;

            if (force > sq(DAL.MICROBIT_ACCELEROMETER_3G_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_3G;

            if (force > sq(DAL.MICROBIT_ACCELEROMETER_6G_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_6G;

            if (force > sq(DAL.MICROBIT_ACCELEROMETER_8G_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_8G;

            // Determine our posture.
            if (this.getX() < (-1000 + DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_TILT_LEFT;

            if (this.getX() > (1000 - DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_TILT_RIGHT;

            if (this.getY() < (-1000 + DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_TILT_DOWN;

            if (this.getY() > (1000 - DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_TILT_UP;

            if (this.getZ() < (-1000 + DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_FACE_UP;

            if (this.getZ() > (1000 - DAL.MICROBIT_ACCELEROMETER_TILT_TOLERANCE))
                return DAL.MICROBIT_ACCELEROMETER_EVT_FACE_DOWN;

            return 0;
        }