add_unaware_timestamp_collection_by_index method

README.md

@@ -587,7 +587,7 @@ LiveChart uses custom [Value](https://lcallarec.github.io/live-chart/Livechart/L
 Basically, it stores the value, as a double, and a timestamp.
 If you use to store in a `Gee.Collection<double?>`, without any timestamp information - most of the time because you know the interval between each points - and need to import them in a LiveChart, don't panic, there's a solution. 
 
-Use `Chart.add_unaware_timestamp_collection()` :
+Use `Chart.add_unaware_timestamp_collection()` or `Chart.add_unaware_timestamp_collection_by_index()`:
 
 ```vala
 // Your own dataset
@@ -604,7 +604,10 @@ serie.clear();
 
 //You know that, in your own model, there's 2000ms between each of your points
 var timespan_between_value = 2000;
+
 chart.add_unaware_timestamp_collection(serie, unaware_timestamp_collection, timespan_between_value);
+//or
+chart.add_unaware_timestamp_collection_by_index(0, unaware_timestamp_collection, timespan_between_value);
 ```
 
 Et voilà !

src/chart.vala

@@ -55,6 +55,11 @@ namespace LiveChart {
             });
         }
 
+        public void add_unaware_timestamp_collection_by_index(int serie_index, Gee.Collection<double?> collection, int timespan_between_value) {
+            var serie = series.get(serie_index);
+            add_unaware_timestamp_collection(serie, collection, timespan_between_value);
+        }
+
         public void to_png(string filename) throws Error {
             var window = this.get_window();
             if (window == null) {

tests/chart.vala

@@ -79,6 +79,38 @@ private void register_chart() {
         assert(serie.get_values().get(0).value == 100);
     });   
 
+
+    Test.add_func("/LiveChart/Chart/add_unaware_timestamp_collection_by_index", () => {
+        //given
+        var chart = new LiveChart.Chart();
+        var serie = new LiveChart.Serie("TEST");
+
+        chart.add_serie(serie);
+
+        var unaware_timestamp_collection = new Gee.ArrayList<double?>();
+        unaware_timestamp_collection.add(5);
+        unaware_timestamp_collection.add(10);
+        unaware_timestamp_collection.add(15);
+
+        var timespan_between_value = 5000;
+
+        //when
+        var now = GLib.get_real_time() / 1000;
+        chart.add_unaware_timestamp_collection_by_index(0, unaware_timestamp_collection, timespan_between_value);
+
+        //then
+        assert(serie.get_values().size == 3);
+        assert(serie.get_values().get(0).value == 5);
+        assert(serie.get_values().get(1).value == 10);
+        assert(serie.get_values().get(2).value == 15);
+        assert(serie.get_values().get(2).timestamp == now);
+        assert(serie.get_values().get(1).timestamp == now - 5000);
+        assert(serie.get_values().get(0).timestamp == now - 10000);
+
+        assert(chart.config.y_axis.get_bounds().lower == 5);
+        assert(chart.config.y_axis.get_bounds().upper == 15);
+    });   
+
     Test.add_func("/LiveChart/Chart/#ShouldNotCrashWhenRevealingAChartWithoutAnyValueAdded", () => {
         //given
         var chart = new LiveChart.Chart();