Add a few constructors

Author: nakedible

crates/bevy_time/src/fixed.rs

@@ -49,6 +49,27 @@ pub struct Fixed {
 }
 
 impl Time<Fixed> {
+    /// Return new fixed time clock with given timestep as `Duration`
+    pub fn from_duration(timestep: Duration) -> Self {
+        let mut ret = Self::default();
+        ret.set_timestep(timestep);
+        ret
+    }
+
+    /// Return new fixed time clock with given timestep seconds as `f64`
+    pub fn from_seconds(seconds: f64) -> Self {
+        let mut ret = Self::default();
+        ret.set_timestep_seconds(seconds);
+        ret
+    }
+
+    /// Return new fixed time clock with given timestep frequency as `f64`
+    pub fn from_hz(hz: f64) -> Self {
+        let mut ret = Self::default();
+        ret.set_timestep_hz(hz);
+        ret
+    }
+
     /// Returns the amount of virtual time that must pass before the fixed
     /// timestep schedule is run again.
     pub fn timestep(&self) -> Duration {

crates/bevy_time/src/virt.rs

@@ -69,6 +69,13 @@ pub struct Virtual {
 impl Time<Virtual> {
     const DEFAULT_MAX_DELTA: Duration = Duration::from_millis(333); // XXX: better value
 
+    /// Create new virtual clock with given maximum delta step `Duration`
+    pub fn from_max_delta(max_delta: Duration) -> Self {
+        let mut ret = Self::default();
+        ret.set_max_delta(max_delta);
+        ret
+    }
+
     /// Returns the maximum amount of time that can be added to this clock by a
     /// single update, as [`std::time::Duration`].
     ///