From 47874c2ec00339314e43d282ab2bc906e9c9ac9b Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sat, 1 Mar 2025 14:26:11 -0500
Subject: add ambient pressure input

---
 engine.h |  2 ++
 main.c   | 16 ++++++++++++++++
 ui.c     | 32 ++++++++++++++++++++++++++++++++
 ui.h     |  5 +++++
 4 files changed, 55 insertions(+)

diff --git a/engine.h b/engine.h
index eaa7dc6..43d5f4b 100644
--- a/engine.h
+++ b/engine.h
@@ -1,5 +1,7 @@
 typedef struct {
 	Volume displacement;
+	Temperature ambient_temperature;
+	Pressure ambient_pressure;
 	AngularSpeed rpm;
 	Pressure map;
 	Fraction ve;
diff --git a/main.c b/main.c
index 8722224..ac0acb9 100644
--- a/main.c
+++ b/main.c
@@ -58,6 +58,7 @@ 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 ambient_pressure_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);
@@ -130,6 +131,8 @@ main_window(mu_Context *ctx, UI *ui) {
 	}
 
 	displacement_row(ctx, ui);
+	ambient_temperature_row(ctx, ui);
+	ambient_pressure_row(ctx, ui);
 
 	vpad(ctx, 0);
 
@@ -171,6 +174,19 @@ ambient_temperature_row(mu_Context *ctx, UI *ui) {
 	}
 }
 
+static void
+ambient_pressure_row(mu_Context *ctx, UI *ui) {
+	mu_layout_row(ctx, 3, (int[]) {LABEL_WIDTH, FIELD_WIDTH, UNIT_WIDTH}, 0);
+	mu_label(ctx, "Ambient pressure:");
+	if (w_field(ctx, &ui->ambient_pressure) & MU_RES_CHANGE) {
+		set_ambient_pressure(ui);
+		set_all_volume_flow_rate(ui);
+	}
+	if (w_select(ctx, &ui->ambient_pressure_unit) & MU_RES_CHANGE) {
+		set_ambient_pressure_unit(ui);
+	}
+}
+
 static void
 rpm_row(mu_Context *ctx, UI *ui) {
 	int i;
diff --git a/ui.c b/ui.c
index 418cb10..0ef1dfb 100644
--- a/ui.c
+++ b/ui.c
@@ -49,6 +49,9 @@ init_ui(UI *ui) {
 	w_init_field(&ui->ambient_temperature);
 	w_init_select(&ui->ambient_temperature_unit, nelem(temperature_units), temperature_units);
 	
+	w_init_field(&ui->ambient_pressure);
+	w_init_select(&ui->ambient_pressure_unit, nelem(pressure_units), pressure_units);
+
 	ui->npoints = 1;
 
 	w_init_field(&ui->rpm[0]);
@@ -122,6 +125,35 @@ set_ambient_temperature_unit(UI *ui) {
 	w_set_field(&ui->ambient_temperature, reader(t));
 }
 
+void
+set_ambient_pressure(UI *ui) {
+	int idx, i;
+	PressureMaker convert;
+	Pressure p;
+
+	idx = ui->ambient_pressure_unit.idx;
+	assert(idx >= 0 && (long unsigned int) idx < nelem(pressure_units));
+
+	convert = pressure_makers[idx];
+	p = convert(ui->ambient_pressure.value);
+
+	for (i = 0; i < ui->npoints; i++) {
+		ui->points[i].ambient_pressure = p;
+	}
+}
+
+void
+set_ambient_pressure_unit(UI *ui) {
+	PressureMaker maker;
+	Pressure p;
+	PressureReader reader;
+
+	maker = pressure_makers[ui->ambient_pressure_unit.oldidx];
+	p = maker(ui->ambient_pressure.value);
+	reader = pressure_readers[ui->ambient_pressure_unit.idx];
+	w_set_field(&ui->ambient_pressure, reader(p));
+}
+
 void
 set_map(UI *ui, int idx) {
 	int unit_idx;
diff --git a/ui.h b/ui.h
index e207327..e1cbfcf 100644
--- a/ui.h
+++ b/ui.h
@@ -7,6 +7,9 @@ typedef struct {
 	w_Field ambient_temperature;
 	w_Select ambient_temperature_unit;
 
+	w_Field ambient_pressure;
+	w_Select ambient_pressure_unit;
+
 	int npoints;
 
 	w_Field rpm[MAX_POINTS];
@@ -27,6 +30,8 @@ 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_ambient_pressure(UI *ui);
+void set_ambient_pressure_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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