refactor: Line breaks for time separations linked to TimeFrame (#1502)

app/src/main/java/com/geeksville/mesh/model/MetricsViewModel.kt

@@ -147,6 +147,20 @@ enum class TimeFrame(
         }
     }
 
+    /**
+     * Used to detect a significant time separation between [Telemetry]s.
+     */
+    fun timeThreshold(): Long {
+        return when (this.ordinal) {
+            TWENTY_FOUR_HOURS.ordinal ->
+                TimeUnit.HOURS.toSeconds(6)
+            FORTY_EIGHT_HOURS.ordinal ->
+                TimeUnit.HOURS.toSeconds(12)
+            else ->
+                TimeUnit.DAYS.toSeconds(1)
+        }
+    }
+
     /**
      * Calculates the needed [Dp] depending on the amount of time being plotted.
      *

app/src/main/java/com/geeksville/mesh/ui/components/DeviceMetrics.kt

@@ -234,7 +234,8 @@ private fun DeviceMetricsChart(
                         path = path,
                         oldestTime = oldest.time,
                         timeRange = timeDiff,
-                        width = width
+                        width = width,
+                        timeThreshold = selectedTime.timeThreshold()
                     ) { i ->
                         val telemetry = telemetries.getOrNull(i) ?: telemetries.last()
                         val ratio = telemetry.deviceMetrics.batteryLevel / MAX_PERCENT_VALUE

app/src/main/java/com/geeksville/mesh/util/GraphUtil.kt

@@ -22,9 +22,6 @@ import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.drawscope.DrawContext
 import com.geeksville.mesh.TelemetryProtos.Telemetry
-import java.util.concurrent.TimeUnit
-
-private const val TIME_SEPARATION_THRESHOLD = 2L
 
 object GraphUtil {
 
@@ -59,6 +56,7 @@ object GraphUtil {
      * @param path [Path] that will be used to draw
      * @param timeRange The time range for the data set
      * @param width of the [DrawContext]
+     * @param timeThreshold to determine significant breaks in time between [Telemetry]s
      * @param calculateY (`index`) -> `y` coordinate
      */
     fun createPath(
@@ -68,6 +66,7 @@ object GraphUtil {
         oldestTime: Int,
         timeRange: Int,
         width: Float,
+        timeThreshold: Long,
         calculateY: (Int) -> Float
     ): Int {
         var i = index
@@ -78,7 +77,7 @@ object GraphUtil {
                 val nextTelemetry = telemetries.getOrNull(i + 1) ?: telemetries.last()
 
                 /* Check to see if we have a significant time break between telemetries. */
-                if (nextTelemetry.time - telemetry.time > TimeUnit.HOURS.toSeconds(TIME_SEPARATION_THRESHOLD)) {
+                if (nextTelemetry.time - telemetry.time > timeThreshold) {
                     i++
                     break
                 }