From 0565d83d27a0329d054c859a017d189b91d4a4ac Mon Sep 17 00:00:00 2001
From: Mike Walters <mike@flomp.net>
Date: Thu, 11 Aug 2016 18:49:20 +0100
Subject: [PATCH] Use SI prefixes in labels

---
 CMakeLists.txt          | 1 +
 spectrogramcontrols.cpp | 9 +++++----
 util.h                  | 4 ++++
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4871c8c..0102f97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,6 +46,7 @@ list(APPEND inspectrum_sources
     traceplot.cpp
     tuner.cpp
     tunertransform.cpp
+    util.cpp
 )
 
 INCLUDE(FindPkgConfig)
diff --git a/spectrogramcontrols.cpp b/spectrogramcontrols.cpp
index 9f31d40..4aa92ea 100644
--- a/spectrogramcontrols.cpp
+++ b/spectrogramcontrols.cpp
@@ -23,6 +23,7 @@
 #include <QFileDialog>
 #include <QLabel>
 #include <cmath>
+#include "util.h"
 
 SpectrogramControls::SpectrogramControls(const QString & title, QWidget * parent)
     : QDockWidget::QDockWidget(title, parent)
@@ -139,12 +140,12 @@ void SpectrogramControls::fileOpenButtonClicked()
 void SpectrogramControls::timeSelectionChanged(float time)
 {
     if (cursorsCheckBox->checkState() == Qt::Checked) {
-        periodLabel->setText(QString::number(time) + "s");
-        rateLabel->setText(QString::number(1 / time) + "Hz");
+        periodLabel->setText(QString::fromStdString(formatSIValue(time)) + "s");
+        rateLabel->setText(QString::fromStdString(formatSIValue(1 / time)) + "Hz");
 
         int symbols = cursorSymbolsSpinBox->value();
-        symbolPeriodLabel->setText(QString::number(time / symbols) + "s");
-        symbolRateLabel->setText(QString::number(symbols / time) + "Hz");
+        symbolPeriodLabel->setText(QString::fromStdString(formatSIValue(time / symbols)) + "s");
+        symbolRateLabel->setText(QString::fromStdString(formatSIValue(symbols / time)) + "Hz");
     }
 }
 
diff --git a/util.h b/util.h
index a752547..e04132f 100644
--- a/util.h
+++ b/util.h
@@ -20,7 +20,9 @@
 
 #pragma once
 #include <algorithm>
+#include <map>
 #include <math.h>
+#include <sstream>
 
 static const double Tau = M_PI * 2.0;
 
@@ -93,3 +95,5 @@ struct range_t {
         return !contains(value);
     }
 };
+
+std::string formatSIValue(float value);