Mirror: Syringe doafter based on Syringe contents (#176)

## Mirror of PR #25890: [Syringe doafter based on Syringe
contents](space-wizards/space-station-14#25890)
from <img src="https://avatars.githubusercontent.com/u/10567778?v=4"
alt="space-wizards" width="22"/>
[space-wizards](https://github.com/space-wizards)/[space-station-14](https://github.com/space-wizards/space-station-14)

###### `37cd12524e85b6a3b31827e4751a94ca51268694`

PR opened by <img
src="https://avatars.githubusercontent.com/u/58439124?v=4"
width="16"/><a href="https://github.com/Plykiya"> Plykiya</a> at
2024-03-06 21:57:17 UTC
PR merged by <img
src="https://avatars.githubusercontent.com/u/19864447?v=4"
width="16"/><a href="https://github.com/web-flow"> web-flow</a> at
2024-03-13 09:35:48 UTC

---

PR changed 1 files with 14 additions and 2 deletions.

The PR had the following labels:


---

<details open="true"><summary><h1>Original Body</h1></summary>

> <!-- Please read these guidelines before opening your PR:
https://docs.spacestation14.io/en/getting-started/pr-guideline -->
> <!-- The text between the arrows are comments - they will not be
visible on your PR. -->
> 
> ## About the PR
> <!-- What did you change in this PR? -->
> Altered the **additional doafter time penalty** to be based on what's
actually in the syringe rather than what you have the TransferAmount set
to for both drawing and injecting.
> 
> ## Why / Balance
> <!-- Why was it changed? Link any discussions or issues here. Please
discuss how this would affect game balance. -->
> It just makes sense.. honestly though, if I could change the total
do-after time to something less than five seconds I would, but I know
that for balance reasons it's probably not good to be able to inject
someone in like one second with 1u of content. That would be infringing
on the territory of hypospray speed for self-injections...
> 
> I think the equation for calculating the additional do-after was wrong
or I'm just really bad at math. I fixed it based on what the comment
intended.
> 
> ## Technical details
> <!-- If this is a code change, summarize at high level how your new
code works. This makes it easier to review. -->
> Altered do-after equation to be based on empty space when drawing and
current content amount when injecting.
> 
> ## Media
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etc) are required to have media attached that showcase the changes.
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> Check the box below to confirm that you have in fact seen this (put an
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> -->
> 
> - [ X ] I have added screenshots/videos to this PR showcasing its
changes ingame, **or** this PR does not require an ingame showcase
> 
> ## Breaking changes
> <!--
> List any breaking changes, including namespace, public
class/method/field changes, prototype renames; and provide instructions
for fixing them. This will be pasted in #codebase-changes.
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> 
> **Changelog**
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> 🆑
> - add: Added fun!
> - remove: Removed fun!
> - tweak: Changed fun!
> - fix: Fixed fun!
> -->
> 🆑
> - tweak: Additional syringe doafter delay is now based on syringe
contents rather than transfer amount setting.


</details>

Co-authored-by: Plykiya <[email protected]>

Content.Server/Chemistry/EntitySystems/InjectorSystem.cs

@@ -128,9 +128,21 @@ private void InjectDoAfter(Entity<InjectorComponent> injector, EntityUid target,
             return;
 
         var actualDelay = MathHelper.Max(injector.Comp.Delay, TimeSpan.FromSeconds(1));
+        float amountToInject;
+        if (injector.Comp.ToggleState == InjectorToggleMode.Draw)
+        {
+            // additional delay is based on actual volume left to draw in syringe when smaller than transfer amount
+            amountToInject = Math.Min(injector.Comp.TransferAmount.Float(), (solution.MaxVolume - solution.Volume).Float());
+        }
+        else
+        {
+            // additional delay is based on actual volume left to inject in syringe when smaller than transfer amount
+            amountToInject = Math.Min(injector.Comp.TransferAmount.Float(), solution.Volume.Float());
+        }
+
+        // Injections take 0.5 seconds longer per 5u of possible space/content
+        actualDelay += TimeSpan.FromSeconds(amountToInject / 10);
 
-        // Injections take 0.5 seconds longer per additional 5u
-        actualDelay += TimeSpan.FromSeconds(injector.Comp.TransferAmount.Float() / injector.Comp.Delay.TotalSeconds - 0.5f);
 
         var isTarget = user != target;