Text in charts now scales using Android's global settings.

Fixes #524.

src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java

@@ -48,7 +48,8 @@ public class ChartValueSeriesTest {
                 R.string.description_elevation_metric,
                 R.string.description_elevation_imperial,
                 R.color.chart_elevation_fill,
-                R.color.chart_elevation_border) {
+                R.color.chart_elevation_border,
+                1) {
             @Override
             double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getElevation();

src/main/java/de/dennisguse/opentracks/chart/ChartValueSeries.java

@@ -68,7 +68,7 @@ abstract class ChartValueSeries {
      * @param fillColor       the fill color
      * @param strokeColor     the stroke color
      */
-    ChartValueSeries(Context context, int absoluteMin, int absoluteMax, int[] intervalValues, int metricTitleId, int imperialTitleId, int fillColor, int strokeColor) {
+    ChartValueSeries(Context context, int absoluteMin, int absoluteMax, int[] intervalValues, int metricTitleId, int imperialTitleId, int fillColor, int strokeColor, float fontScale) {
         this.absoluteMin = absoluteMin;
         this.absoluteMax = absoluteMax;
         this.intervalValues = intervalValues;
@@ -85,16 +85,14 @@ abstract class ChartValueSeries {
         strokePaint.setColor(context.getResources().getColor(strokeColor));
         strokePaint.setAntiAlias(true);
 
-        float scale = context.getResources().getDisplayMetrics().density;
-
         // Make copies of the stroke paint with the default thickness
         titlePaint = new Paint(strokePaint);
-        titlePaint.setTextSize(ChartView.MEDIUM_TEXT_SIZE * scale);
+        titlePaint.setTextSize(ChartView.MEDIUM_TEXT_SIZE * fontScale);
         titlePaint.setTextAlign(Align.CENTER);
         titlePaint.setStyle(Style.FILL_AND_STROKE);
 
         markerPaint = new Paint(strokePaint);
-        markerPaint.setTextSize(ChartView.SMALL_TEXT_SIZE * scale);
+        markerPaint.setTextSize(ChartView.SMALL_TEXT_SIZE * fontScale);
         markerPaint.setTextAlign(Align.RIGHT);
         markerPaint.setStyle(Style.FILL_AND_STROKE);
 

src/main/java/de/dennisguse/opentracks/chart/ChartView.java

@@ -193,6 +193,10 @@ public class ChartView extends View {
     public ChartView(Context context, final boolean chartByDistance) {
         super(context);
         this.chartByDistance = chartByDistance;
+        float fontScale = context.getResources().getDisplayMetrics().density
+                * context.getResources().getConfiguration().fontScale;
+
+
         seriesList.add(new ChartValueSeries(context,
                 Integer.MIN_VALUE,
                 Integer.MAX_VALUE,
@@ -200,7 +204,8 @@ public class ChartView extends View {
                 R.string.description_elevation_metric,
                 R.string.description_elevation_imperial,
                 R.color.chart_elevation_fill,
-                R.color.chart_elevation_border) {
+                R.color.chart_elevation_border,
+                fontScale) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getElevation();
@@ -219,7 +224,8 @@ public class ChartView extends View {
                 R.string.description_speed_metric,
                 R.string.description_speed_imperial,
                 R.color.chart_speed_fill,
-                R.color.chart_speed_border) {
+                R.color.chart_speed_border,
+                fontScale) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getSpeed();
@@ -239,7 +245,8 @@ public class ChartView extends View {
                 R.string.description_pace_metric,
                 R.string.description_pace_imperial,
                 R.color.chart_pace_fill,
-                R.color.chart_pace_border) {
+                R.color.chart_pace_border,
+                fontScale) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getPace();
@@ -259,7 +266,8 @@ public class ChartView extends View {
                 R.string.description_sensor_heart_rate,
                 R.string.description_sensor_heart_rate,
                 R.color.chart_heart_rate_fill,
-                R.color.chart_heart_rate_border) {
+                R.color.chart_heart_rate_border,
+                fontScale) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getHeartRate();
@@ -278,7 +286,8 @@ public class ChartView extends View {
                 R.string.description_sensor_cadence,
                 R.string.description_sensor_cadence,
                 R.color.chart_cadence_fill,
-                R.color.chart_cadence_border) {
+                R.color.chart_cadence_border,
+                fontScale) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getCadence();
@@ -296,7 +305,9 @@ public class ChartView extends View {
                 R.string.description_sensor_power,
                 R.string.description_sensor_power,
                 R.color.chart_power_fill,
-                R.color.chart_power_border) {
+                R.color.chart_power_border,
+                fontScale
+        ) {
             @Override
             protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getPower();
@@ -310,13 +321,11 @@ public class ChartView extends View {
 
         backgroundColor = ThemeUtils.getBackgroundColor(context);
 
-        float scale = context.getResources().getDisplayMetrics().density;
-
         axisPaint = new Paint();
         axisPaint.setStyle(Style.FILL_AND_STROKE);
         axisPaint.setColor(ThemeUtils.getTextColorPrimary(context));
         axisPaint.setAntiAlias(true);
-        axisPaint.setTextSize(SMALL_TEXT_SIZE * scale);
+        axisPaint.setTextSize(SMALL_TEXT_SIZE * fontScale);
 
         xAxisMarkerPaint = new Paint(axisPaint);
         xAxisMarkerPaint.setTextAlign(Align.CENTER);
@@ -882,6 +891,7 @@ public class ChartView extends View {
 
     /**
      * Finds the index of the first data point containing data for a series.
+     *
      * @return -1 if no data point contains data for the series.
      */
     private int getFirstPopulatedChartDataIndex(ChartValueSeries chartValueSeries) {