3 files changed, 25 insertions, 8 deletions
diff --git a/main.c b/main.c
index fd31910..4c1257a 100644
--- a/main.c
+++ b/main.c
@@ -182,7 +182,7 @@ map_row(mu_Context *ctx, UI *ui) {
 	mu_layout_width(ctx, FIELD_WIDTH);
 	for (i = 0; i <ui->npoints; i++) {
 		if (w_field(ctx, &ui->map[i])) {
-			/* TODO */
+			set_map(ui, i);
 		}
 	}
 }
diff --git a/ui.c b/ui.c
index f3e5c4a..676c442 100644
--- a/ui.c
+++ b/ui.c
@@ -11,25 +11,28 @@
 #define nelem(arr) (sizeof(arr)/sizeof(arr[0]))
 
 
-static const char *const displacement_units[] = {"cc", "l", "ci"};
-static Volume (*displacement_converters[nelem(displacement_units)])(double) = {
+static const char *const volume_units[] = {"cc", "l", "ci"};
+static Volume (*volume_converters[nelem(volume_units)])(double) = {
 	cubic_centimetre, litre, cubic_inch,
 };
 
-static const char *const map_units[] = {"mbar", "kPa", "bar", "psi"};
+static const char *const pressure_units[] = {"mbar", "kPa", "bar", "psi"};
+static Pressure (*pressure_converters[nelem(pressure_units)])(double) = {
+	millibar, kilopascal, bar, psi,
+};
 
 
 void
 init_ui(UI *ui) {
 	w_init_field(&ui->displacement);
-	w_init_select(&ui->displacement_unit, nelem(displacement_units), displacement_units);
+	w_init_select(&ui->displacement_unit, nelem(volume_units), volume_units);
 	
 	ui->npoints = 1;
 
 	w_init_field(&ui->rpm[0]);
 
 	w_init_field(&ui->map[0]);
-	w_init_select(&ui->map_unit, nelem(map_units), map_units);
+	w_init_select(&ui->map_unit, nelem(pressure_units), pressure_units);
 
 	w_init_field(&ui->ve[0]);
 
@@ -42,9 +45,9 @@ set_displacement(UI *ui) {
 	Volume (*convert)(double), disp;
 
 	idx = ui->displacement_unit.idx;
-	assert(idx >= 0 && (long unsigned int) idx < nelem(displacement_units));
+	assert(idx >= 0 && (long unsigned int) idx < nelem(volume_units));
 
-	convert = displacement_converters[idx];
+	convert = volume_converters[idx];
 	disp = convert(ui->displacement.value);
 
 	for (i = 0; i < ui->npoints; i++) {
@@ -53,6 +56,19 @@ set_displacement(UI *ui) {
 }
 
 void
+set_map(UI *ui, int idx) {
+	int unit_idx;
+	Pressure (*convert)(double), p;
+
+	unit_idx = ui->map_unit.idx;
+	assert(unit_idx >= 0 && (long unsigned int) unit_idx < nelem(pressure_units));
+
+	convert = pressure_converters[unit_idx];
+	p = convert(ui->map[idx].value);
+	ui->points[idx].map = p;
+}
+
+void
 insert_point(UI *ui, int idx) {
 	int i;
 
diff --git a/ui.h b/ui.h
index 4d0a63a..56f1bd3 100644
--- a/ui.h
+++ b/ui.h
@@ -18,5 +18,6 @@ typedef struct {
 
 void init_ui(UI *ui);
 void set_displacement(UI *ui);
+void set_map(UI *ui, int idx);
 void insert_point(UI *ui, int idx);
 void remove_point(UI *ui, int idx);