66 lines
2.9 KiB
C#
66 lines
2.9 KiB
C#
using Content.Server.GameObjects.Components.Power;
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using JetBrains.Annotations;
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using Robust.Shared.GameObjects;
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using Robust.Shared.GameObjects.Systems;
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using Robust.Shared.Maths;
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using System;
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namespace Content.Server.GameObjects.EntitySystems
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{
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/// <summary>
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/// Responsible for maintaining the solar-panel sun angle and updating <see cref='SolarPanelComponent'/> coverage.
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/// </summary>
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[UsedImplicitly]
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public class PowerSolarSystem: EntitySystem
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{
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/// <summary>
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/// The current sun angle.
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/// </summary>
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public Angle TowardsSun = Angle.South;
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public override void Initialize()
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{
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EntityQuery = new TypeEntityQuery(typeof(SolarPanelComponent));
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}
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public override void Update(float frameTime)
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{
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TowardsSun += Angle.FromDegrees(frameTime / 10);
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TowardsSun = TowardsSun.Reduced();
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foreach (var entity in RelevantEntities)
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{
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// In the 'sunRelative' coordinate system:
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// the sun is considered to be an infinite distance directly up.
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// this is the rotation of the panel relative to that.
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// directly upwards (theta = 0) = coverage 1
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// left/right 90 degrees (abs(theta) = (pi / 2)) = coverage 0
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// directly downwards (abs(theta) = pi) = coverage -1
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// as TowardsSun + = CCW,
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// panelRelativeToSun should - = CW
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var panelRelativeToSun = entity.Transform.WorldRotation - TowardsSun;
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// essentially, given cos = X & sin = Y & Y is 'downwards',
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// then for the first 90 degrees of rotation in either direction,
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// this plots the lower-right quadrant of a circle.
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// now basically assume a line going from the negated X/Y to there,
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// and that's the hypothetical solar panel.
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//
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// since, again, the sun is considered to be an infinite distance upwards,
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// this essentially means Cos(panelRelativeToSun) is half of the cross-section,
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// and since the full cross-section has a max of 2, effectively-halving it is fine.
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//
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// as for when it goes negative, it only does that when (abs(theta) > pi)
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// and that's expected behavior.
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float coverage = (float) Math.Max(0, Math.Cos(panelRelativeToSun));
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// Would determine occlusion, but that requires raytraces.
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// And I'm not sure where those are in the codebase.
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// Luckily, auto-rotation isn't in yet, so it won't matter anyway.
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// Total coverage calculated; apply it to the panel.
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var panel = entity.GetComponent<SolarPanelComponent>();
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panel.Coverage = coverage;
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}
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}
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}
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}
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