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Prevent reading non-existing sensors

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This commit is contained in:
Valerie Young 2019-01-11 10:56:00 -05:00
parent f6a9dd95b0
commit 328e4480f6
1 changed files with 22 additions and 10 deletions
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32
src/extensions/scratch3_gdx_for/index.js
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@ -68,6 +68,7 @@ class GdxFor {
this.disconnect = this.disconnect.bind(this);
this._onConnect = this._onConnect.bind(this);
this._sensorsEnabled = null;
}
@ -100,12 +101,13 @@ class GdxFor {
}
/**
* Called by the runtime when a use exits the connection popup.
* Called by the runtime when a user exits the connection popup.
* Disconnect from the GDX FOR.
*/
disconnect () {
if (this._device) {
this._device.close();
this._sensorsEnabled = false;
}
}
@ -151,12 +153,22 @@ class GdxFor {
}
});
});
this._device.on('measurements-started', () => {
this._sensorsEnabled = true;
})
this._device.start(10); // Set the period to 10 milliseconds
}
/**
* Device is connected and measurements enabled
* @private
*/
_canReadSensors () {
return this.isConnected() && this._sensorsEnabled;
}
getForce () {
if (this.isConnected()) {
if (this._canReadSensors()) {
let force = this._device.getSensor(1).value;
// Normalize the force, which can be measured between -50 and 50 N,
// to be a value between -100 and 100.
@ -167,7 +179,7 @@ class GdxFor {
}
getTiltX () {
if (this.isConnected()) {
if (this._canReadSensors()) {
let x = this.getAccelerationX();
let y = this.getAccelerationY();
let z = this.getAccelerationZ();
@ -217,7 +229,7 @@ class GdxFor {
}
getTiltY () {
if (this.isConnected()) {
if (this._canReadSensors()) {
let x = this.getAccelerationX();
let y = this.getAccelerationY();
let z = this.getAccelerationZ();
@ -268,42 +280,42 @@ class GdxFor {
getAccelerationX () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(2).value;
}
return 0;
}
getAccelerationY () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(3).value;
}
return 0;
}
getAccelerationZ () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(4).value;
}
return 0;
}
getSpinSpeedX () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(5).value * (180 / Math.PI);
}
return 0;
}
getSpinSpeedY () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(6).value * (180 / Math.PI);
}
return 0;
}
getSpinSpeedZ () {
if (this.isConnected()) {
if (this._canReadSensors()) {
return this._device.getSensor(7).value * (180 / Math.PI);
}
return 0;