From b856ed01cdfd58d8889d664812fab88904e364ce Mon Sep 17 00:00:00 2001
From: Knyffen <knyffen@gmail.com>
Date: Thu, 21 Nov 2024 07:47:46 +0100
Subject: [PATCH] Add line with calories burned per day

---
 server/src/math/calculations.rs | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/server/src/math/calculations.rs b/server/src/math/calculations.rs
index bae6f61..6c6d181 100644
--- a/server/src/math/calculations.rs
+++ b/server/src/math/calculations.rs
@@ -12,6 +12,7 @@ use time::*;
 
 const MEALS_PER_DAY: f32 = 2.3;
 const SMOOTHING_DAYS: usize = 21;
+const CALORIES_BURNED_PER_DAY: f32 = 2270.;
 
 fn time_date_to_chrono_naive_date(d: Date) -> chrono::NaiveDate {
     chrono::NaiveDate::from_ymd_opt(d.year(), d.month() as u32, d.day() as u32).unwrap()
@@ -125,6 +126,18 @@ pub fn plot_calories_per_day(
             .label("today")
             .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], BLACK));
 
+        chart
+            .draw_series(LineSeries::new(
+                vec![
+                    (mindate_chrono, CALORIES_BURNED_PER_DAY),
+                    (maxdate_chrono, CALORIES_BURNED_PER_DAY),
+                ],
+                BLACK.stroke_width(2),
+            ))
+            .unwrap()
+            .label("calories burned per day")
+            .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], BLACK));
+
         chart
             .draw_series(LineSeries::new(
                 calorie_days.iter().enumerate().map(|(i, cal)| {
@@ -162,7 +175,6 @@ pub fn plot_weight_loss(
     running: Vec<my_structs::Running>,
 ) -> plotting::SVGPlotFun {
     let (mindate, calorie_days) = calculate_calories_per_day(nutrition_map, purchases);
-    let calories_burned_per_day: f32 = 2270.;
 
     // Based on the Caloie Burned by Distance Calculator
     // https://www.calculator.net/calories-burned-calculator.html
@@ -194,7 +206,7 @@ pub fn plot_weight_loss(
         .iter()
         .enumerate()
         .scan(0., |deficit, (i, &calories)| {
-            *deficit += calories - calories_burned_per_day - running_days[i];
+            *deficit += calories - CALORIES_BURNED_PER_DAY - running_days[i];
             Some(*deficit)
         })
         .collect();