34 lines
1.0 KiB
C#
34 lines
1.0 KiB
C#
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using Godot;
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namespace SupaLidlGame.Utils;
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public static class Physics
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{
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/// <summary>
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/// Returns the predicted position of a target after a time t at which a
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/// projectile is predicted to hit a target.
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/// </summary>
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public static Vector2 PredictNewPosition(
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Vector2 position,
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float speed,
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Vector2 targetPosition,
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Vector2 targetVelocity,
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out float time)
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{
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// relative velocity is sum of projectile's relative velocity when idle
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// plus its relative velocity when heading towards target (as origin)
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var relIdle = -targetVelocity;
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var relDir = (position - targetPosition).DirectionTo(Vector2.Zero);
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var relVel = relIdle + relDir * speed;
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var relSpeed = relVel.Length();
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// get t = time to travel
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// = (|s2| - |s1|)/(|v2| - |v1|)
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time = position.DistanceTo(targetPosition) / relSpeed;
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// predict target's position after time t
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return targetPosition + targetVelocity * time;
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}
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}
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