From 3f05b42ab04ca4990edf0f374f02dfea7b3be10a Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sat, 1 Mar 2025 14:17:48 -0500
Subject: add ambient temperature input

---
 main.c | 21 +++++++++++++++------
 ui.c   | 40 ++++++++++++++++++++++++++++++++++++++++
 ui.h   |  5 +++++
 3 files changed, 60 insertions(+), 6 deletions(-)

diff --git a/main.c b/main.c
index e31e7ab..8722224 100644
--- a/main.c
+++ b/main.c
@@ -57,6 +57,7 @@ static void main_loop(mu_Context *ctx, UI *ui);
 static void process_frame(mu_Context *ctx, UI *ui);
 static void main_window(mu_Context *ctx, UI *ui);
 static void displacement_row(mu_Context *ctx, UI *ui);
+static void ambient_temperature_row(mu_Context *ctx, UI *ui);
 static void rpm_row(mu_Context *ctx, UI *ui);
 static void map_row(mu_Context *ctx, UI *ui);
 static void ve_row(mu_Context *ctx, UI *ui);
@@ -146,12 +147,7 @@ main_window(mu_Context *ctx, UI *ui) {
 
 static void
 displacement_row(mu_Context *ctx, UI *ui) {
-	int widths[] = {
-		LABEL_WIDTH+UNIT_WIDTH+ctx->style->spacing,
-		FIELD_WIDTH,
-		UNIT_WIDTH
-	};
-	mu_layout_row(ctx, nelem(widths), widths, 0);
+	mu_layout_row(ctx, 3, (int[]) {LABEL_WIDTH, FIELD_WIDTH, UNIT_WIDTH}, 0);
 	mu_label(ctx, "Displacement:");
 	if (w_field(ctx, &ui->displacement) & MU_RES_CHANGE) {
 		set_displacement(ui);
@@ -162,6 +158,19 @@ displacement_row(mu_Context *ctx, UI *ui) {
 	}
 }
 
+static void
+ambient_temperature_row(mu_Context *ctx, UI *ui) {
+	mu_layout_row(ctx, 3, (int[]) {LABEL_WIDTH, FIELD_WIDTH, UNIT_WIDTH}, 0);
+	mu_label(ctx, "Ambient temperature:");
+	if (w_field(ctx, &ui->ambient_temperature) & MU_RES_CHANGE) {
+		set_ambient_temperature(ui);
+		set_all_volume_flow_rate(ui);
+	}
+	if (w_select(ctx, &ui->ambient_temperature_unit) & MU_RES_CHANGE) {
+		set_ambient_temperature_unit(ui);
+	}
+}
+
 static void
 rpm_row(mu_Context *ctx, UI *ui) {
 	int i;
diff --git a/ui.c b/ui.c
index 1591901..418cb10 100644
--- a/ui.c
+++ b/ui.c
@@ -19,6 +19,14 @@ static const VolumeReader volume_readers[nelem(volume_units)] = {
 	as_cubic_centimetre, as_litre, as_cubic_inch,
 };
 
+static const char *const temperature_units[] = {"°C", "K", "°F", "°R"};
+static const TemperatureMaker temperature_makers[nelem(temperature_units)] = {
+	celsius, kelvin, fahrenheit, rankine,
+};
+static const TemperatureReader temperature_readers[nelem(temperature_units)] = {
+	as_celsius, as_kelvin, as_fahrenheit, as_rankine,
+};
+
 static const char *const pressure_units[] = {"mbar", "kPa", "bar", "psi"};
 static const PressureMaker pressure_makers[nelem(pressure_units)] = {
 	millibar, kilopascal, bar, psi,
@@ -37,6 +45,9 @@ void
 init_ui(UI *ui) {
 	w_init_field(&ui->displacement);
 	w_init_select(&ui->displacement_unit, nelem(volume_units), volume_units);
+
+	w_init_field(&ui->ambient_temperature);
+	w_init_select(&ui->ambient_temperature_unit, nelem(temperature_units), temperature_units);
 	
 	ui->npoints = 1;
 
@@ -82,6 +93,35 @@ set_displacement_unit(UI *ui) {
 	w_set_field(&ui->displacement, reader(disp));
 }
 
+void
+set_ambient_temperature(UI *ui) {
+	int idx, i;
+	TemperatureMaker convert;
+	Temperature t;
+
+	idx = ui->ambient_temperature_unit.idx;
+	assert(idx >= 0 && (long unsigned int) idx < nelem(temperature_units));
+
+	convert = temperature_makers[idx];
+	t = convert(ui->ambient_temperature.value);
+
+	for (i = 0; i < ui->npoints; i++) {
+		ui->points[i].ambient_temperature = t;
+	}
+}
+
+void
+set_ambient_temperature_unit(UI *ui) {
+	TemperatureMaker maker;
+	Temperature t;
+	TemperatureReader reader;
+
+	maker = temperature_makers[ui->ambient_temperature_unit.oldidx];
+	t = maker(ui->ambient_temperature.value);
+	reader = temperature_readers[ui->ambient_temperature_unit.idx];
+	w_set_field(&ui->ambient_temperature, reader(t));
+}
+
 void
 set_map(UI *ui, int idx) {
 	int unit_idx;
diff --git a/ui.h b/ui.h
index cc985ae..e207327 100644
--- a/ui.h
+++ b/ui.h
@@ -4,6 +4,9 @@ typedef struct {
 	w_Field displacement;
 	w_Select displacement_unit;
 
+	w_Field ambient_temperature;
+	w_Select ambient_temperature_unit;
+
 	int npoints;
 
 	w_Field rpm[MAX_POINTS];
@@ -22,6 +25,8 @@ typedef struct {
 void init_ui(UI *ui);
 void set_displacement(UI *ui);
 void set_displacement_unit(UI* ui);
+void set_ambient_temperature(UI *ui);
+void set_ambient_temperature_unit(UI *ui);
 void set_map(UI *ui, int idx);
 void set_map_unit(UI *ui);
 void set_ve(UI *ui, int idx);
-- 
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