bevy/examples/ecs
Cameron 7989cb2650 Add global time scaling (#5752)
# Objective

- Make `Time` API more consistent.
- Support time accel/decel/pause.

## Solution

This is just the `Time` half of #3002. I was told that part isn't controversial.

- Give the "delta time" and "total elapsed time" methods `f32`, `f64`, and `Duration` variants with consistent naming.
- Implement accelerating / decelerating the passage of time.
- Implement stopping time.

---

## Changelog

- Changed `time_since_startup` to `elapsed` because `time.time_*` is just silly.
- Added `relative_speed` and `set_relative_speed` methods.
- Added `is_paused`, `pause`, `unpause` , and methods. (I'd prefer `resume`, but `unpause` matches `Timer` API.)
- Added `raw_*` variants of the "delta time" and "total elapsed time" methods.
- Added `first_update` method because there's a non-zero duration between startup and the first update.

## Migration Guide

- `time.time_since_startup()` -> `time.elapsed()`
- `time.seconds_since_startup()` -> `time.elapsed_seconds_f64()`
- `time.seconds_since_startup_wrapped_f32()` -> `time.elapsed_seconds_wrapped()`

If you aren't sure which to use, most systems should continue to use "scaled" time (e.g. `time.delta_seconds()`). The realtime "unscaled" time measurements (e.g. `time.raw_delta_seconds()`) are mostly for debugging and profiling.
2022-10-22 18:52:29 +00:00
..
component_change_detection.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
custom_query_param.rs Spawn now takes a Bundle (#6054) 2022-09-23 19:55:54 +00:00
ecs_guide.rs Exclusive Systems Now Implement System. Flexible Exclusive System Params (#6083) 2022-09-26 23:57:07 +00:00
event.rs Replace the bool argument of Timer with TimerMode (#6247) 2022-10-17 13:47:01 +00:00
fixed_timestep.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
generic_system.rs Replace the bool argument of Timer with TimerMode (#6247) 2022-10-17 13:47:01 +00:00
hierarchy.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
iter_combinations.rs Spawn now takes a Bundle (#6054) 2022-09-23 19:55:54 +00:00
parallel_query.rs Spawn now takes a Bundle (#6054) 2022-09-23 19:55:54 +00:00
removal_detection.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
startup_system.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
state.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
system_closure.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
system_param.rs Spawn now takes a Bundle (#6054) 2022-09-23 19:55:54 +00:00
system_piping.rs Rename system chaining to system piping (#6230) 2022-10-11 15:21:12 +00:00
system_sets.rs Add global time scaling (#5752) 2022-10-22 18:52:29 +00:00
timers.rs Replace the bool argument of Timer with TimerMode (#6247) 2022-10-17 13:47:01 +00:00