RiftTrailEffect.java

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package com.fs.starfarer.api.impl.combat;
 
import java.awt.Color;
import java.util.List;
 
import org.lwjgl.util.vector.Vector2f;
 
import com.fs.starfarer.api.Global;
import com.fs.starfarer.api.combat.BaseEveryFrameCombatPlugin;
import com.fs.starfarer.api.combat.CombatEngineAPI;
import com.fs.starfarer.api.combat.MissileAPI;
import com.fs.starfarer.api.input.InputEventAPI;
import com.fs.starfarer.api.util.IntervalUtil;
import com.fs.starfarer.api.util.Misc;
 
public class RiftTrailEffect extends BaseEveryFrameCombatPlugin {
 
    protected IntervalUtil interval = new IntervalUtil(0.1f, 0.3f);
    
    protected MissileAPI missile;
    protected String loopId;
    
    
    public RiftTrailEffect(MissileAPI missile, String loopId) {
        this.missile = missile;
        this.loopId = loopId;
    }
 
    @Override
    public void advance(float amount, List<InputEventAPI> events) {
        if (Global.getCombatEngine().isPaused()) return;
        
        if (loopId != null) {
            Global.getSoundPlayer().playLoop(loopId, missile, 1f, missile.getBrightness(), 
                    missile.getLocation(), missile.getVelocity());
        }
        
        interval.advance(amount);
        if (interval.intervalElapsed()) {
            addParticles();
        }
        
        if (missile.isExpired() || missile.didDamage() || !Global.getCombatEngine().isEntityInPlay(missile)) {
            Global.getCombatEngine().removePlugin(this);
        }
    }
    
 
    public void addParticles() {
        CombatEngineAPI engine = Global.getCombatEngine();
        Color c = RiftLanceEffect.getColorForDarkening(RiftCascadeEffect.STANDARD_RIFT_COLOR);
        // subtracting the standard color looks better, makes the red a bit purplish
        // inverting red to substract doesn't look as good for the trails
//      MissileSpecAPI spec = missile.getSpec();
//      c = spec.getExplosionColor();
        
        Color undercolor = RiftCascadeEffect.EXPLOSION_UNDERCOLOR;
        
        float b = missile.getCurrentBaseAlpha();
        c = Misc.scaleAlpha(c, b);
        undercolor = Misc.scaleAlpha(undercolor, b);
        
        float baseDuration = 4f;
        float size = 30f;
        size = missile.getSpec().getGlowRadius() * 0.5f;
        
        Vector2f point = new Vector2f(missile.getLocation());
        Vector2f pointOffset = new Vector2f(missile.getVelocity());
        pointOffset.scale(0.1f);
        Vector2f.add(point, pointOffset, point);
        
        Vector2f vel = new Vector2f();
        
        for (int i = 0; i < 1; i++) {
            float dur = baseDuration + baseDuration * (float) Math.random();
            //float nSize = size * (1f + 0.0f * (float) Math.random());
            //float nSize = size * (0.75f + 0.5f * (float) Math.random());
            float nSize = size;
            Vector2f pt = Misc.getPointWithinRadius(point, nSize * 0.5f);
            Vector2f v = Misc.getUnitVectorAtDegreeAngle((float) Math.random() * 360f);
            v.scale(nSize + nSize * (float) Math.random() * 0.5f);
            v.scale(0.2f);
            Vector2f.add(vel, v, v);
            
            float maxSpeed = nSize * 1.5f * 0.2f; 
            float minSpeed = nSize * 1f * 0.2f; 
            float overMin = v.length() - minSpeed;
            if (overMin > 0) {
                float durMult = 1f - overMin / (maxSpeed - minSpeed);
                if (durMult < 0.1f) durMult = 0.1f;
                dur *= 0.5f + 0.5f * durMult;
            }
            engine.addNegativeNebulaParticle(pt, v, nSize * 1f, 2f,
                                            0.5f, 0f, dur, c);
        }
        
        float dur = baseDuration; 
        float rampUp = 0f;
        rampUp = 0.5f;
        c = undercolor;
        for (int i = 0; i < 2; i++) {
            Vector2f loc = new Vector2f(point);
            loc = Misc.getPointWithinRadius(loc, size * 1f);
            float s = size * 3f * (0.5f + (float) Math.random() * 0.5f);
            engine.addNebulaParticle(loc, vel, s, 1.5f, rampUp, 0f, dur, c);
        }
    }
    
}