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