Simplify the calculation of speed graph scale

src/gui/properties/speedplotview.cpp

@@ -28,9 +28,12 @@
 
 #include "speedplotview.h"
 
+#include <cmath>
+
 #include <QLocale>
 #include <QPainter>
 #include <QPen>
+
 #include "base/global.h"
 #include "base/unicodestrings.h"
 #include "base/utils/misc.h"
@@ -85,20 +88,16 @@ namespace
             calculatedUnit = static_cast<SizeUnit>(static_cast<int>(calculatedUnit) + 1);
         }
 
-        if (value > 100.0)
+        if (value > 100)
         {
-            int roundedValue = static_cast<int>(value / 40) * 40;
-            while (roundedValue < value)
-                roundedValue += 40;
-            return {static_cast<double>(roundedValue), calculatedUnit};
+            const double roundedValue {std::ceil(value / 40) * 40};
+            return {roundedValue, calculatedUnit};
         }
 
-        if (value > 10.0)
+        if (value > 10)
         {
-            int roundedValue = static_cast<int>(value / 4) * 4;
-            while (roundedValue < value)
-                roundedValue += 4;
-            return {static_cast<double>(roundedValue), calculatedUnit};
+            const double roundedValue {std::ceil(value / 4) * 4};
+            return {roundedValue, calculatedUnit};
         }
 
         for (const auto &roundedValue : roundingTable)