Fill chart series in python

QML doesn't have a method for replacing all points at once, which makes
it extremely slow when loading large profiles

load_controller/profile_handler.py

@@ -2,7 +2,8 @@ import enum
 import csv
 import time
 
-from PySide6.QtCore import QObject, Signal, QTimer
+from PySide6.QtCore import QObject, Signal, Slot, QTimer, QPointF
+from PySide6.QtCharts import QLineSeries
 
 
 class ProfileState(enum.Enum):
@@ -50,6 +51,14 @@ class ProfileHandler(QObject):
             self.profileChanged.emit(result)
             return result
 
+    @Slot(QLineSeries)
+    def fill_series(self, series: QLineSeries):
+        points = []
+        for x, y in self._profile:
+            points.append(QPointF(x, y))
+        series.replace(points)
+        pass
+
     def start(self):
         assert self.state == ProfileState.STOPPED
 

ui/main_window.qml

@@ -29,13 +29,8 @@ ApplicationWindow {
         }
 
         function onProfileChanged(data) {
-            profileSeries.clear();
-            var last_x = 0;
-            for (var point of data) {
-                profileSeries.append(point[0], point[1]);
-                last_x = point[0];
-            }
-            axisX.max = last_x;
+            profile_handler.fill_series(profileSeries);
+            axisX.max = data[data.length - 1][0];
             axisX.applyNiceNumbers();
         }
     }