Add power balance source with center outward drawing mode (#52)

* Add power balance source with center outward drawing mode

* Add apk archive step

.github/workflows/android.yml

@@ -45,6 +45,12 @@ jobs:
     - name: Build with Gradle
       run: ./gradlew build
 
+    - name: Archive APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: app-release.apk
+        path: app/build/outputs/apk/release/app-release.apk
+
     - name: Create Release
       id: create_release
       uses: softprops/action-gh-release@v2

app/src/main/kotlin/de/timklge/karoopowerbar/CustomProgressBar.kt

@@ -42,6 +42,7 @@ class CustomProgressBar(private val view: CustomView,
     var showLabel: Boolean = true
     var barBackground: Boolean = false
     @ColorInt var progressColor: Int = 0xFF2b86e6.toInt()
+    var drawMode: ProgressBarDrawMode = ProgressBarDrawMode.STANDARD
 
     var fontSize = CustomProgressBarFontSize.MEDIUM
         set(value) {
@@ -152,15 +153,63 @@ class CustomProgressBar(private val view: CustomView,
         val fullWidth = canvas.width.toFloat()
         val halfWidth = fullWidth / 2f
 
-        val barLeft = when (horizontalLocation) {
+        // Calculate bar left and right positions based on draw mode
-            HorizontalPowerbarLocation.LEFT -> 0f
+        val (barLeft, barRight) = when (drawMode) {
-            HorizontalPowerbarLocation.RIGHT -> fullWidth - (halfWidth * p).toFloat()
+            ProgressBarDrawMode.STANDARD -> {
-            HorizontalPowerbarLocation.FULL -> 0f
+                // Standard left-to-right progress bar
+                when (horizontalLocation) {
+                    HorizontalPowerbarLocation.LEFT -> Pair(0f, (halfWidth * p).toFloat())
+                    HorizontalPowerbarLocation.RIGHT -> Pair(fullWidth - (halfWidth * p).toFloat(), fullWidth)
+                    HorizontalPowerbarLocation.FULL -> Pair(0f, (fullWidth * p).toFloat())
+                }
+            }
+            ProgressBarDrawMode.CENTER_OUT -> {
+                // Center-outward progress bar: 0.5 = invisible, <0.5 = extend left, >0.5 = extend right
+                when (horizontalLocation) {
+                    HorizontalPowerbarLocation.LEFT -> {
+                        val centerPoint = halfWidth / 2f  // Center of left half
+                        when {
+                            p == 0.5 -> Pair(centerPoint, centerPoint) // Invisible at 0.5
+                            p < 0.5 -> {
+                                val leftExtent = centerPoint * (0.5 - p) * 2.0 // Map 0.0-0.5 to full left extension
+                                Pair((centerPoint - leftExtent).toFloat(), centerPoint)
+                            }
+                            else -> {
+                                val rightExtent = centerPoint * (p - 0.5) * 2.0 // Map 0.5-1.0 to full right extension
+                                Pair(centerPoint, (centerPoint + rightExtent).toFloat())
+                            }
+                        }
+                    }
+                    HorizontalPowerbarLocation.RIGHT -> {
+                        val centerPoint = halfWidth + (halfWidth / 2f)  // Center of right half
+                        when {
+                            p == 0.5 -> Pair(centerPoint, centerPoint) // Invisible at 0.5
+                            p < 0.5 -> {
+                                val leftExtent = (halfWidth / 2f) * (0.5 - p) * 2.0 // Map 0.0-0.5 to full left extension
+                                Pair((centerPoint - leftExtent).toFloat(), centerPoint)
+                            }
+                            else -> {
+                                val rightExtent = (halfWidth / 2f) * (p - 0.5) * 2.0 // Map 0.5-1.0 to full right extension
+                                Pair(centerPoint, (centerPoint + rightExtent).toFloat())
+                            }
+                        }
+                    }
+                    HorizontalPowerbarLocation.FULL -> {
+                        val centerPoint = halfWidth  // Center of full width
+                        when {
+                            p == 0.5 -> Pair(centerPoint, centerPoint) // Invisible at 0.5
+                            p < 0.5 -> {
+                                val leftExtent = halfWidth * (0.5 - p) * 2.0 // Map 0.0-0.5 to full left extension
+                                Pair((centerPoint - leftExtent).toFloat(), centerPoint)
+                            }
+                            else -> {
+                                val rightExtent = halfWidth * (p - 0.5) * 2.0 // Map 0.5-1.0 to full right extension
+                                Pair(centerPoint, (centerPoint + rightExtent).toFloat())
+                            }
+                        }
+                    }
+                }
             }
-        val barRight = when (horizontalLocation) {
-            HorizontalPowerbarLocation.LEFT -> (halfWidth * p).toFloat()
-            HorizontalPowerbarLocation.RIGHT -> fullWidth
-            HorizontalPowerbarLocation.FULL -> (fullWidth * p).toFloat()
         }
 
         val minTargetX = when (horizontalLocation) {
@@ -256,7 +305,44 @@ class CustomProgressBar(private val view: CustomView,
 
                         val textBounds = textPaint.measureText(label)
                         val xOffset = (textBounds + 20).coerceAtLeast(10f) / 2f
-                        val x = (if (horizontalLocation != HorizontalPowerbarLocation.RIGHT) rect.right - xOffset else rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+
+                        // Calculate label position based on draw mode
+                        val x = when (drawMode) {
+                            ProgressBarDrawMode.STANDARD -> {
+                                // Original logic for standard mode
+                                (if (horizontalLocation != HorizontalPowerbarLocation.RIGHT) rect.right - xOffset else rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                            }
+                            ProgressBarDrawMode.CENTER_OUT -> {
+                                // For center outward mode, position label at the edge of the bar
+                                when {
+                                    p == 0.5 -> {
+                                        // When bar is invisible (at center), position at center
+                                        when (horizontalLocation) {
+                                            HorizontalPowerbarLocation.LEFT -> {
+                                                val centerPoint = halfWidth / 2f
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                            HorizontalPowerbarLocation.RIGHT -> {
+                                                val centerPoint = halfWidth + (halfWidth / 2f)
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                            HorizontalPowerbarLocation.FULL -> {
+                                                val centerPoint = halfWidth
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                        }
+                                    }
+                                    p < 0.5 -> {
+                                        // Bar extends left from center, place label at left edge
+                                        (rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                    }
+                                    else -> {
+                                        // Bar extends right from center, place label at right edge
+                                        (rect.right - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                    }
+                                }
+                            }
+                        }
                         val r = x + xOffset * 2
 
                         val fm = textPaint.fontMetrics
@@ -344,7 +430,44 @@ class CustomProgressBar(private val view: CustomView,
 
                         val textBounds = textPaint.measureText(label)
                         val xOffset = (textBounds + 20).coerceAtLeast(10f) / 2f
-                        val x = (if (horizontalLocation != HorizontalPowerbarLocation.RIGHT) rect.right - xOffset else rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+
+                        // Calculate label position based on draw mode
+                        val x = when (drawMode) {
+                            ProgressBarDrawMode.STANDARD -> {
+                                // Original logic for standard mode
+                                (if (horizontalLocation != HorizontalPowerbarLocation.RIGHT) rect.right - xOffset else rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                            }
+                            ProgressBarDrawMode.CENTER_OUT -> {
+                                // For center outward mode, position label at the edge of the bar
+                                when {
+                                    p == 0.5 -> {
+                                        // When bar is invisible (at center), position at center
+                                        when (horizontalLocation) {
+                                            HorizontalPowerbarLocation.LEFT -> {
+                                                val centerPoint = halfWidth / 2f
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                            HorizontalPowerbarLocation.RIGHT -> {
+                                                val centerPoint = halfWidth + (halfWidth / 2f)
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                            HorizontalPowerbarLocation.FULL -> {
+                                                val centerPoint = halfWidth
+                                                (centerPoint - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                            }
+                                        }
+                                    }
+                                    p < 0.5 -> {
+                                        // Bar extends left from center, place label at left edge
+                                        (rect.left - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                    }
+                                    else -> {
+                                        // Bar extends right from center, place label at right edge
+                                        (rect.right - xOffset).coerceIn(backgroundLeft..backgroundRight-xOffset*2f)
+                                    }
+                                }
+                            }
+                        }
                         val r = x + xOffset * 2
 
                         // textDrawBaselineY calculation uses rect.top and barSize.barHeight.

app/src/main/kotlin/de/timklge/karoopowerbar/Window.kt

@@ -55,6 +55,11 @@ enum class HorizontalPowerbarLocation {
     FULL, LEFT, RIGHT
 }
 
+enum class ProgressBarDrawMode {
+    STANDARD,    // Normal left-to-right progress
+    CENTER_OUT   // Progress extends outward from center (0.5 = invisible, <0.5 = left, >0.5 = right)
+}
+
 class Window(
     private val context: Context,
     val powerbarLocation: PowerbarLocation = PowerbarLocation.BOTTOM,
@@ -183,6 +188,7 @@ class Window(
                     SelectedSource.ROUTE_PROGRESS -> streamRouteProgress(SelectedSource.ROUTE_PROGRESS, ::getRouteProgress)
                     SelectedSource.REMAINING_ROUTE -> streamRouteProgress(SelectedSource.REMAINING_ROUTE, ::getRemainingRouteProgress)
                     SelectedSource.GRADE -> streamGrade()
+                    SelectedSource.POWER_BALANCE -> streamBalance()
                     SelectedSource.NONE -> {}
                 }
             })
@@ -199,6 +205,51 @@ class Window(
         }
     }
 
+    private suspend fun streamBalance() {
+        data class StreamData(val powerBalanceLeft: Double?, val power: Double?)
+
+        karooSystem.streamDataFlow(DataType.Type.PEDAL_POWER_BALANCE)
+            .map {
+                val values = (it as? StreamState.Streaming)?.dataPoint?.values
+
+                StreamData(values?.get(DataType.Field.PEDAL_POWER_BALANCE_LEFT), values?.get(DataType.Field.POWER))
+            }
+            .distinctUntilChanged()
+            .throttle(1_000).collect { streamData ->
+                val powerBalanceLeft = streamData.powerBalanceLeft
+                val powerbarsWithBalanceSource = powerbars.values.filter { it.source == SelectedSource.POWER_BALANCE }
+
+                powerbarsWithBalanceSource.forEach { powerbar ->
+                    powerbar.drawMode = ProgressBarDrawMode.CENTER_OUT
+
+                    if (streamData.powerBalanceLeft != null) {
+                        val value = remap(1.0 - (powerBalanceLeft ?: 0.5).coerceIn(0.0, 1.0), 0.4, 0.6, 0.0, 1.0)
+
+                        val percentLeft = ((powerBalanceLeft ?: 0.5) * 100).roundToInt()
+                        val percentDiffTo50 = (percentLeft - 50).absoluteValue
+
+                        @ColorRes val zoneColorRes = Zone.entries[percentDiffTo50.toInt().coerceIn(0, Zone.entries.size-1)].colorResource
+
+                        powerbar.progressColor = context.getColor(zoneColorRes)
+                        powerbar.progress = value
+
+                        val percentRight = 100 - percentLeft
+
+                        powerbar.label = "${percentLeft}-${percentRight}"
+
+                        Log.d(TAG, "Balance: $powerBalanceLeft power: ${streamData.power}")
+                    } else {
+                        powerbar.progressColor = context.getColor(R.color.zone0)
+                        powerbar.progress = null
+                        powerbar.label = "?"
+
+                        Log.d(TAG, "Balance: Unavailable")
+                    }
+                    powerbar.invalidate()
+                }
+            }
+    }
+
     data class BarProgress(
         val progress: Double?,
         val label: String?,

app/src/main/kotlin/de/timklge/karoopowerbar/screens/MainScreen.kt

@@ -88,6 +88,7 @@ enum class SelectedSource(val id: String, val label: String) {
     CADENCE("cadence", "Cadence"),
     CADENCE_3S("cadence_3s", "Cadence (3 sec avg)"),
     GRADE("grade", "Grade"),
+    POWER_BALANCE("power_balance", "Power Balance"),
     ROUTE_PROGRESS("route_progress", "Route Progress"),
     REMAINING_ROUTE("route_progress_remaining", "Route Remaining");