Make SAC values in planner settings respect unit settings

So far, the fields for the two SAC rates did not show a unit and were implictly l/min.
Now they respect the settings for volume units. This was harder than I thought for two reasons:

1) Imperial units for SAC are cuft/min but a typical value would be .70. So I made the point
the field prefix and what is entered is actually hundreth of cuft per minute.

2) I had to get the rounding right in order not to get effects like 20l/min become .70 cuft/min (19800 ml/min
internally) which would then become 19l/min when switching back.

While being at it, I gave the gradient factors '%'-signs as units.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

dive.c

@@ -188,6 +188,17 @@ double get_volume_units(unsigned int ml, int *frac, const char **units)
 	return vol;
 }
 
+int units_to_sac(int volume)
+{
+	if(get_units()->volume == CUFT)
+		if (volume < 10)
+			return cuft_to_l(volume) * 100;
+		else
+			return cuft_to_l(volume) * 10;
+	else
+		return volume * 1000;
+}
+
 unsigned int units_to_depth(double depth)
 {
 	if (get_units()->length == METERS)

dive.h

@@ -99,6 +99,7 @@ extern double get_weight_units(unsigned int grams, int *frac, const char **units
 extern double get_vertical_speed_units(unsigned int mms, int *frac, const char **units);
 
 extern unsigned int units_to_depth(double depth);
+extern int units_to_sac(int volume);
 
 /* Volume in mliter of a cylinder at pressure 'p' */
 extern int gas_volume(cylinder_t *cyl, pressure_t p);

qt-ui/diveplanner.cpp

@@ -416,8 +416,8 @@ PlannerSettingsWidget::PlannerSettingsWidget(QWidget *parent, Qt::WindowFlags f)
 	connect(ui.gflow, SIGNAL(editingFinished()), plannerModel, SLOT(triggerGFLow()));
 	connect(ui.backgasBreaks, SIGNAL(toggled(bool)), this, SLOT(setBackgasBreaks(bool)));
 
-	ui.bottomSAC->setValue(prefs.bottomsac / 1000.0);
+	ui.bottomSAC->setValue(rint(get_volume_units(prefs.bottomsac, NULL, NULL)));
-	ui.decoStopSAC->setValue(prefs.decosac / 1000.0);
+	ui.decoStopSAC->setValue(rint(get_volume_units(prefs.decosac, NULL, NULL)));
 	ui.gflow->setValue(prefs.gflow);
 	ui.gfhigh->setValue(prefs.gfhigh);
 
@@ -466,6 +466,21 @@ void PlannerSettingsWidget::settingsChanged()
 		ui.asc50to6->setText(tr("50% avg. depth to 6m"));
 		ui.asc6toSurf->setText(tr("6m to surface"));
 	}
+	if(get_units()->volume == units::CUFT) {
+		ui.bottomSAC->setSuffix(tr("cuft/min"));
+		ui.decoStopSAC->setSuffix(tr("cuft/min"));
+		ui.bottomSAC->setPrefix(".");
+		ui.decoStopSAC->setPrefix(".");
+		ui.bottomSAC->setValue(rint(ml_to_cuft(prefs.bottomsac) * 100.0));
+		ui.decoStopSAC->setValue(rint(ml_to_cuft(prefs.decosac) * 100.0));
+	} else {
+		ui.bottomSAC->setSuffix(tr("ℓ/min"));
+		ui.decoStopSAC->setSuffix(tr("ℓ/min"));
+		ui.bottomSAC->setPrefix("");
+		ui.decoStopSAC->setPrefix("");
+		ui.bottomSAC->setValue(rint((double) prefs.bottomsac / 1000.0));
+		ui.decoStopSAC->setValue(rint((double) prefs.decosac / 1000.0));
+	}
 	updateUnitsUI();
 	ui.ascRate75->setSuffix(vs);
 	ui.ascRate50->setSuffix(vs);
@@ -690,14 +705,17 @@ void DivePlannerPointsModel::emitDataChanged()
 
 void DivePlannerPointsModel::setBottomSac(int sac)
 {
-	diveplan.bottomsac = sac * 1000;
+	volume_t newSAC;
+	newSAC.mliter = units_to_sac(sac);
+	diveplan.bottomsac = newSAC.mliter;
 	prefs.bottomsac = diveplan.bottomsac;
 	emit dataChanged(createIndex(0, 0), createIndex(rowCount() - 1, COLUMNS - 1));
 }
 
 void DivePlannerPointsModel::setDecoSac(int sac)
 {
-	diveplan.decosac = sac * 1000;
+	volume_t newSAC;
+	diveplan.decosac = units_to_sac(sac);
 	prefs.decosac = diveplan.decosac;
 	emit dataChanged(createIndex(0, 0), createIndex(rowCount() - 1, COLUMNS - 1));
 }

qt-ui/plannerSettings.ui

@@ -30,8 +30,8 @@
        <rect>
         <x>0</x>
         <y>0</y>
-        <width>1089</width>
+        <width>1078</width>
-        <height>404</height>
+        <height>418</height>
        </rect>
       </property>
       <layout class="QHBoxLayout" name="horizontalLayout">
@@ -271,6 +271,9 @@
           </item>
           <item row="0" column="1">
            <widget class="QSpinBox" name="gflow">
+            <property name="suffix">
+             <string>%</string>
+            </property>
             <property name="minimum">
              <number>1</number>
             </property>
@@ -288,6 +291,9 @@
           </item>
           <item row="1" column="1">
            <widget class="QSpinBox" name="gfhigh">
+            <property name="suffix">
+             <string>%</string>
+            </property>
             <property name="minimum">
              <number>1</number>
             </property>
@@ -362,7 +368,11 @@
            </widget>
           </item>
           <item row="0" column="1">
-           <widget class="QSpinBox" name="bottomSAC"/>
+           <widget class="QSpinBox" name="bottomSAC">
+            <property name="suffix">
+             <string>ℓ/min</string>
+            </property>
+           </widget>
           </item>
           <item row="1" column="0">
            <widget class="QLabel" name="label_14">
@@ -372,7 +382,11 @@
            </widget>
           </item>
           <item row="1" column="1">
-           <widget class="QSpinBox" name="decoStopSAC"/>
+           <widget class="QSpinBox" name="decoStopSAC">
+            <property name="suffix">
+             <string>ℓ/min</string>
+            </property>
+           </widget>
           </item>
           <item row="2" column="0">
            <widget class="QLabel" name="label_6">