错误处理

Qt/plot/Explicit_Plot.cpp

@@ -8,7 +8,7 @@ Explicit_Plot::Explicit_Plot()
     : Abs_Plot(new Abs_Plot_Private(false)) {}
 
 Render_Ticket Explicit_Plot::replot() {
-    return {d->scene->render_frame(true)};
+    return {d->scene->render_frame(true) == Plot_Render_Error::none};
 }
 
 } // namespace renderive

Qt/plot/Plot.cpp

@@ -43,8 +43,12 @@ void Abs_Plot_Private::attach_widget(Abs_Plot* plot) {
     timer = new QTimer(plot);
     timer->setTimerType(Qt::PreciseTimer);
     QObject::connect(timer, &QTimer::timeout, plot, [this] {
-        if (scene->view_active())
-            (void)scene->render_frame();
+        if (!scene->view_active())
+            return;
+        const auto error = scene->render_frame();
+        if (error == Plot_Render_Error::external_failure ||
+            error == Plot_Render_Error::scene_shutting_down)
+            timer->stop();
     });
 }