From 361d920a41970159c552dbe8e84f41d8d650c39e Mon Sep 17 00:00:00 2001
From: deanlee <deanlee3@gmail.com>
Date: Sat, 21 Dec 2024 12:18:03 +0800
Subject: [PATCH] add help to chart

---
 tools/cabana/chart/chartswidget.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/cabana/chart/chartswidget.cc b/tools/cabana/chart/chartswidget.cc
index 29f16d7577de8f..03f839de2803ba 100644
--- a/tools/cabana/chart/chartswidget.cc
+++ b/tools/cabana/chart/chartswidget.cc
@@ -136,10 +136,12 @@ ChartsWidget::ChartsWidget(QWidget *parent) : QFrame(parent) {
   setIsDocked(true);
   newTab();
   qApp->installEventFilter(this);
-
   setWhatsThis(tr(R"(
-    <b>Chart view</b><br />
-    <!-- TODO: add descprition here -->
+    <b>Chart View</b><br />
+    <b>Click</b>: Click to seek to a corresponding time.<br />
+    <b>Drag</b>: Zoom into the chart.<br />
+    <b>Shift + Drag</b>: Scrub through the chart to view values.<br />
+    <b>Right Mouse</b>: Open the context menu.<br />
   )"));
 }