47 lines
1.4 KiB
MonkeyC
47 lines
1.4 KiB
MonkeyC
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import Toybox.Lang;
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import Toybox.Sensor;
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import Toybox.UserProfile;
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// Wraps the heart-rate sensor and maps the current bpm to a zone (1..5).
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// Returns null bpm when no reading is available (e.g. simulator without data
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// simulation), so the view can show a placeholder.
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class HeartRateProvider {
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private var _hr as Number?;
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private var _zones as Array<Number>?;
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public function initialize() {
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_hr = null;
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_zones = null;
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}
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public function onStart() as Void {
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Sensor.setEnabledSensors([Sensor.SENSOR_HEARTRATE]);
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Sensor.enableSensorEvents(method(:onSensor));
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_zones = UserProfile.getHeartRateZones(UserProfile.HR_ZONE_SPORT_GENERIC);
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}
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public function onStop() as Void {
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Sensor.enableSensorEvents(null);
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}
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public function onSensor(info as Sensor.Info) as Void {
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_hr = info.heartRate;
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}
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public function getHeartRate() as Number? {
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return _hr;
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}
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// Returns 1..5, or 0 if HR/zones unavailable.
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public function getZone() as Number {
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if (_hr == null || _zones == null) { return 0; }
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var z = _zones as Array<Number>;
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var hr = _hr as Number;
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// _zones holds 6 boundaries: [z1lo, z2lo, z3lo, z4lo, z5lo, max]
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for (var i = z.size() - 2; i >= 0; i -= 1) {
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if (hr >= z[i]) { return i + 1 > 5 ? 5 : i + 1; }
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}
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return 1;
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}
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}
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