From e9e5c21068ab8d92b69d522a752f4362a112242b Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sat, 1 Mar 2025 12:40:27 -0500
Subject: reformat MAP when unit changes

---
 main.c |  4 +++-
 ui.c   | 18 ++++++++++++++++++
 ui.h   |  1 +
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/main.c b/main.c
index 2b712d1..7d5bdd3 100644
--- a/main.c
+++ b/main.c
@@ -187,7 +187,9 @@ map_row(mu_Context *ctx, UI *ui) {
 	mu_layout_width(ctx, LABEL_WIDTH);
 	mu_label(ctx, "map:");
 	mu_layout_width(ctx, UNIT_WIDTH);
-	w_select(ctx, &ui->map_unit);
+	if (w_select(ctx, &ui->map_unit) & MU_RES_CHANGE) {
+		set_map_unit(ui);
+	}
 	mu_layout_width(ctx, FIELD_WIDTH);
 	for (i = 0; i <ui->npoints; i++) {
 		if (w_field(ctx, &ui->map[i])) {
diff --git a/ui.c b/ui.c
index cd9dddb..fea7e20 100644
--- a/ui.c
+++ b/ui.c
@@ -24,6 +24,9 @@ static const char *const pressure_units[] = {"mbar", "kPa", "bar", "psi"};
 static const PressureMaker pressure_makers[nelem(pressure_units)] = {
 	millibar, kilopascal, bar, psi,
 };
+static const PressureReader pressure_readers[nelem(pressure_units)] = {
+	as_millibar, as_kilopascal, as_bar, as_psi,
+};
 
 static const char *const volume_flow_rate_units[] = {"m³/s", "CFM"};
 static VolumeFlowRateReader volume_flow_rate_readers[nelem(volume_flow_rate_units)] = {
@@ -94,6 +97,21 @@ set_map(UI *ui, int idx) {
 	ui->points[idx].map = p;
 }
 
+void
+set_map_unit(UI *ui) {
+	PressureMaker maker;
+	PressureReader reader;
+	int i;
+	Pressure map;
+
+	maker = pressure_makers[ui->map_unit.oldidx];
+	reader = pressure_readers[ui->map_unit.idx];
+	for (i = 0; i < ui->npoints; i++) {
+		map = maker(ui->map[i].value);
+		w_set_field(&ui->map[i], reader(map));
+	}
+}
+
 void
 set_ve(UI *ui, int idx) {
 	ui->points[idx].ve = percent(ui->ve[idx].value);
diff --git a/ui.h b/ui.h
index 1238325..02baee6 100644
--- a/ui.h
+++ b/ui.h
@@ -23,6 +23,7 @@ void init_ui(UI *ui);
 void set_displacement(UI *ui);
 void set_displacement_unit(UI* ui);
 void set_map(UI *ui, int idx);
+void set_map_unit(UI *ui);
 void set_ve(UI *ui, int idx);
 void set_volume_flow_rate(UI *ui, int idx);
 void set_all_volume_flow_rate(UI *ui);
-- 
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