Zoom & scroll profile chart

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

@@ -29,21 +29,23 @@ ApplicationWindow {
         }
 
         function onProfileChanged(data) {
-            profileSeries.clear();
+            profile_handler.fill_series(profileSeries);
-            var last_x = 0;
+            var x_max = data[data.length - 1][0];
-            for (var point of data) {
+            axisX.max = x_max;
-                profileSeries.append(point[0], point[1]);
-                last_x = point[0];
-            }
-            axisX.max = last_x;
             axisX.applyNiceNumbers();
+            profileView.zoomReset();
         }
     }
 
     onProfileTimeChanged: {
+        var old_x = profileView.mapToPosition(currentTimeSeries.at(0)).x;
         currentTimeSeries.clear()
         currentTimeSeries.append(profileTime, 0)
         currentTimeSeries.append(profileTime, 100)
+        var new_x = profileView.mapToPosition(currentTimeSeries.at(0)).x;
+        if (new_x > profileView.plotArea.width / 2) {
+            profileView.scrollRight(new_x - old_x);
+        }
     }
 
     onBmsErrorChanged: {
@@ -68,6 +70,8 @@ ApplicationWindow {
                 }
             }
             ChartView {
+                id: profileView
+
                 Layout.fillWidth: true
                 Layout.fillHeight: true
                 Layout.minimumWidth: 400
@@ -102,6 +106,28 @@ ApplicationWindow {
                     visible: true
                 }
             }
+            RowLayout {
+                Button {
+                    text: "+"
+                    onClicked: {
+                        var r = Qt.rect(profileView.plotArea.x, profileView.plotArea.y, profileView.plotArea.width / 2, profileView.plotArea.height);
+                        profileView.zoomIn(r);
+                    }
+                }
+                Button {
+                    text: "-"
+                    onClicked: {
+                        var r = Qt.rect(profileView.plotArea.x, profileView.plotArea.y, profileView.plotArea.width * 2, profileView.plotArea.height);
+                        profileView.zoomIn(r);
+                    }
+                }
+                Button {
+                    text: "Reset zoom"
+                    onClicked: {
+                        profileView.zoomReset();
+                    }
+                }
+            }
             RowLayout {
                 Button {
                     objectName: "start_pause"