reformat displacement when unit changes

1 files changed, 15 insertions, 0 deletions

diff --git a/ui.c b/ui.c
index 3fca1ae..216a10b 100644
--- a/ui.c
+++ b/ui.c
@@ -16,6 +16,9 @@ static const char *const volume_units[] = {"cc", "l", "ci"};
 static const VolumeMaker volume_makers[nelem(volume_units)] = {
 	cubic_centimetre, litre, cubic_inch,
 };
+static const VolumeReader volume_readers[nelem(volume_units)] = {
+	as_cubic_centimetre, as_litre, as_cubic_inch,
+};
 
 static const char *const pressure_units[] = {"mbar", "kPa", "bar", "psi"};
 static const PressureMaker pressure_makers[nelem(pressure_units)] = {
@@ -66,6 +69,18 @@ set_displacement(UI *ui) {
 }
 
 void
+set_displacement_unit(UI *ui) {
+	VolumeMaker maker;
+	Volume disp;
+	VolumeReader reader;
+
+	maker = volume_makers[ui->displacement_unit.oldidx];
+	disp = maker(ui->displacement.value);
+	reader = volume_readers[ui->displacement_unit.idx];
+	w_set_field(&ui->displacement, reader(disp));
+}
+
+void
 set_map(UI *ui, int idx) {
 	int unit_idx;
 	PressureMaker convert;