diff --git a/mandelbulber2/qt/animation_value_chart_widget.cpp b/mandelbulber2/qt/animation_value_chart_widget.cpp
index f254e2073..88d27f860 100644
--- a/mandelbulber2/qt/animation_value_chart_widget.cpp
+++ b/mandelbulber2/qt/animation_value_chart_widget.cpp
@@ -143,6 +143,7 @@ void cAnimationValueChartWidget::paintEvent(QPaintEvent *event)
 	painter.setPen(pen);
 	painter.drawText(width() / 2, fontPixelSize, "Parameter: " + animationPath.parameterName);
 }
+
 void cAnimationValueChartWidget::SetAnimationPath(const cAnimationPath &path)
 {
 	animationPath = path;
@@ -204,8 +205,14 @@ void cAnimationValueChartWidget::mouseMoveEvent(QMouseEvent *event)
 
 		if (mouseDragStarted)
 		{
-			qDebug() << pressedKeyIndex << event->x() << event->y();
 			emit update();
+
+			// calculate keyframe number and value when x and y coordinates in the widget are known
+
+			double value =
+				max - (event->y() - margin * height()) / ((1.0 - 2.0 * margin) * height()) * (max - min);
+
+			emit signalUpdateKey(pressedKeyIndex, value);
 		}
 	}
 }
diff --git a/mandelbulber2/qt/animation_value_chart_widget.h b/mandelbulber2/qt/animation_value_chart_widget.h
index 5fae86170..eb225beda 100644
--- a/mandelbulber2/qt/animation_value_chart_widget.h
+++ b/mandelbulber2/qt/animation_value_chart_widget.h
@@ -42,6 +42,9 @@ public slots:
 	void slotZoomOut();
 	void slotSetCurrentFrame(int frame);
 
+signals:
+	void signalUpdateKey(int key, double value);
+
 private:
 	void paintEvent(QPaintEvent *event) override;
 	void mouseMoveEvent(QMouseEvent *event) override;
diff --git a/mandelbulber2/src/animation_keyframes.cpp b/mandelbulber2/src/animation_keyframes.cpp
index 4c4ce1a81..4d23ea698 100644
--- a/mandelbulber2/src/animation_keyframes.cpp
+++ b/mandelbulber2/src/animation_keyframes.cpp
@@ -178,6 +178,9 @@ cKeyframeAnimation::cKeyframeAnimation(cInterface *_interface, std::shared_ptr<c
 		connect(ui->toolButton_chartZoomOut, &QToolButton::clicked, ui->widgetValueChart,
 			&cAnimationValueChartWidget::slotZoomOut);
 
+		connect(ui->widgetValueChart, &cAnimationValueChartWidget::signalUpdateKey, this,
+			&cKeyframeAnimation::slotUpdateKeyByChart);
+
 		table = ui->tableWidget_keyframe_animation;
 
 		// add default parameters for animation
@@ -2434,6 +2437,23 @@ void cKeyframeAnimation::slotClickedPrevFrame()
 	}
 }
 
+void cKeyframeAnimation::slotUpdateKeyByChart(int key, double value)
+{
+	if (table->currentRow() >= reservedRows)
+	{
+		cAnimationFrames::sAnimationFrame frame = keyframes->GetFrame(key);
+		cOneParameter parameter =
+			frame.parameters.GetAsOneParameter(GetParameterName(table->currentRow()));
+		parameter.Set(value, valueActual);
+		frame.parameters.SetFromOneParameter(GetParameterName(table->currentRow()), parameter);
+		keyframes->ModifyFrame(key, frame);
+
+		const int parameterIndex = rowParameter.at(table->currentRow());
+		const int vectorComponentIndex = table->currentRow() - parameterRows.at(parameterIndex);
+		UpdateAnimationPathSingleParameter(parameterIndex, vectorComponentIndex);
+	}
+}
+
 cKeyframeRenderThread::cKeyframeRenderThread(QString &_settingsText) : QThread()
 {
 	settingsText = _settingsText;
diff --git a/mandelbulber2/src/animation_keyframes.hpp b/mandelbulber2/src/animation_keyframes.hpp
index c73d92390..f7e93edb1 100644
--- a/mandelbulber2/src/animation_keyframes.hpp
+++ b/mandelbulber2/src/animation_keyframes.hpp
@@ -151,6 +151,7 @@ private slots:
 	void slotSliderMovedActualFrame(int);
 	void slotClickedNextFrame();
 	void slotClickedPrevFrame();
+	void slotUpdateKeyByChart(int key, double value);
 
 private:
 	void PrepareTable();