SpeedReduction.java

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package com.fs.starfarer.api.impl.campaign.ghosts;
 
import org.lwjgl.util.vector.Vector2f;
 
import com.fs.starfarer.api.EveryFrameScript;
import com.fs.starfarer.api.campaign.CampaignFleetAPI;
import com.fs.starfarer.api.campaign.SectorEntityToken;
import com.fs.starfarer.api.util.Misc;
 
public class SpeedReduction implements EveryFrameScript {
 
    protected float elapsed;
    protected SectorEntityToken target;
    protected float speedReductionRate;
    protected float durationSeconds;
 
    public SpeedReduction(SectorEntityToken target, float speedReductionFraction) {
        this(target, speedReductionFraction, 0.2f);
    }
    public SpeedReduction(SectorEntityToken target, float speedReductionFraction, float durationSeconds) {
        this.target = target;
        this.durationSeconds = durationSeconds;
        speedReductionRate = target.getVelocity().length() * speedReductionFraction / durationSeconds;
    }
 
    public void advance(float amount) {
        if (target instanceof CampaignFleetAPI) {
            target.setOrbit(null);
        }
        
        Vector2f v = target.getVelocity();
        
        Vector2f dV = Misc.getUnitVector(new Vector2f(), v);
        dV.scale(-1f * Math.min(v.length(), speedReductionRate * Math.min(durationSeconds, amount)));
        
        SensorGhost ghost = SensorGhostManager.getGhostFor(target);
        if (ghost != null) {
            v = ghost.getMovement().getVelocity();
            ghost.getMovement().getVelocity().set(v.x + dV.x, v.y + dV.y);
        } else if (target instanceof CampaignFleetAPI) {
            v = ((CampaignFleetAPI)target).getVelocityFromMovementModule(); 
            ((CampaignFleetAPI)target).setVelocity(v.x + dV.x, v.y + dV.y);
        } else {
            target.getVelocity().set(v.x + dV.x, v.y + dV.y);
        }
 
        elapsed += amount;
    }
 
    public boolean isDone() {
        return elapsed >= durationSeconds;
    }
 
    public boolean runWhilePaused() {
        return false;
    }
 
}