diff -r a730825bc5e4 -r d03a426e0b6b src/EditProduct.h
--- a/src/EditProduct.h	Tue Jul 26 11:15:37 2022 +0200
+++ b/src/EditProduct.h	Tue Jul 26 14:26:50 2022 +0200
@@ -1,6 +1,8 @@
 #ifndef _EDITPRODUCT_H
 #define _EDITPRODUCT_H
 
+#include "MainWindow.h"
+
 #include <QDialog>
 #include <QStringList>
 #include <QJsonDocument>
@@ -19,6 +21,8 @@
 
 #include "global.h"
 
+class Callout;
+
 struct StepResult {
     double	svol;
     double	irate;
@@ -42,6 +46,9 @@
     explicit EditProduct(int id, QWidget *parent = 0);
     ~EditProduct();
 
+public slots:
+    void tooltip(QPointF point, bool state);
+
 private slots:
     void on_saveButton_clicked();
     void on_quitButton_clicked();
@@ -190,6 +197,7 @@
     void brew_trubloss_changed(double val);
     void brew_topupwater_changed(double val);
     void brew_log_button();
+    void savePNG();
     void brix_changed(double val);
     void primary_start_changed(double val);
     void primary_peak_changed(double val);
@@ -273,6 +281,9 @@
     QLabel *htimeLabel, *mtimeLabel, *mamountLabel, *yamountLabel, *ivolLabel, *itmpLabel;
     QTableWidget *splitTable;
     QPushButton *split_addButton, *split_delButton;
+    QChart *chart;
+    QChartView *chartView;
+    Callout *t_tooltip = 0;
 
     void to100Fermentables(int row);
     static bool ferment_sort_test(const Fermentables &D1, const Fermentables &D2);