add tick and subtick system for solar system orbit updates

1 files changed, 26 insertions, 0 deletions

diff --git a/src/timeman.rs b/src/timeman.rs
index 32a6f45..64250ee 100644
--- a/src/timeman.rs
+++ b/src/timeman.rs
@@ -12,9 +12,12 @@ pub const HOUR: Second = MINUTE * 60;
 pub const DAY: Second = HOUR * 24;
 pub const YEAR: Second = DAY * 365;
 
+pub const SYSTEM_TICK_INTERVAL: Second = 1 * DAY;
+
 pub struct TimeMan
 {
     time: Second,
+    last_time: Second,
     pub auto_tick: Option<Second>
 }
 
@@ -24,6 +27,7 @@ impl TimeMan
     -> Self {
         Self {
             time,
+            last_time: time,
             auto_tick: None
         }
     }
@@ -42,11 +46,33 @@ impl TimeMan
 
     pub fn update(
         &mut self)
+    -> Vec<Second>
     {
         match self.auto_tick {
             Some(advance) => { self.time += advance; },
             None => {}
         }
+
+        let time_diff = self.time - self.last_time;
+        
+        let tick_diff = self.time / SYSTEM_TICK_INTERVAL -
+                        self.last_time / SYSTEM_TICK_INTERVAL;
+
+        if time_diff == 0 || tick_diff == 0 {
+            self.last_time = self.time;
+            return vec![];
+        }
+
+        let time_start = self.last_time - (self.last_time % SYSTEM_TICK_INTERVAL);
+        let time_end = self.time - (self.time % SYSTEM_TICK_INTERVAL);
+
+        let tick_start = time_start / SYSTEM_TICK_INTERVAL;
+        let tick_end = time_end / SYSTEM_TICK_INTERVAL;
+
+        self.last_time = self.time;
+        (tick_start..tick_end).map(|v| {
+            v * SYSTEM_TICK_INTERVAL
+        }).collect::<Vec<_>>()
     }
 
     pub fn format_duration(time: Second) -> String