Update shutter speed based on illuminance

2024-08-05 20:08:57 +02:00
parent 886357a34d
commit 7bbb001809
1 changed files with 13 additions and 1 deletions
@@ -57,11 +57,23 @@ class MainActivity : ComponentActivity(), SensorEventListener {
        illuminanceSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT)
    }

+    fun updateLightmeterState(illuminance: Double) {
+        val iso = lightmeterState.value.iso
+        val aperture = lightmeterState.value.aperture
+        val shutterSpeed = (aperture * aperture) / (illuminance * (iso / 100))
+        lightmeterState.value = lightmeterState.value.copy(
+            illuminance = illuminance,
+            iso = iso,
+            aperture = aperture,
+            shutterSpeed = shutterSpeed
+        )
+    }
+
    override fun onSensorChanged(event: SensorEvent?) {
        event?.values?.let {
            for (v in it) {
                Log.d(TAG, "sensor changed: $v lux")
-                lightmeterState.value = lightmeterState.value.copy(illuminance = v.toDouble())
+                updateLightmeterState(v.toDouble())
            }
        }
    }