Added the cursed gem of darkness

src/main/java/com/minelittlepony/unicopia/entity/EntitySpell.java

@@ -17,7 +17,7 @@ import com.minelittlepony.unicopia.spell.SpellRegistry;
 import net.minecraft.block.SoundType;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.EntityLiving;
+import net.minecraft.entity.EntityCreature;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.SoundEvents;
@@ -35,7 +35,7 @@ import net.minecraft.util.SoundCategory;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
 
-public class EntitySpell extends EntityLiving implements IMagicals, ICaster<EntityLivingBase>, IInAnimate {
+public class EntitySpell extends EntityCreature implements IMagicals, ICaster<EntityLivingBase>, IInAnimate {
 
 	private EntityLivingBase owner = null;
 

src/main/java/com/minelittlepony/unicopia/particle/client/ParticleSphere.java

@@ -15,8 +15,6 @@ import com.minelittlepony.util.render.Color;
 
 public class ParticleSphere extends Particle implements IAttachableParticle {
 
-    private final float baseAlpha;
-
     protected int tint;
     protected float alpha;
 
@@ -28,6 +26,10 @@ public class ParticleSphere extends Particle implements IAttachableParticle {
 
     public ParticleSphere(int id, World w, double x, double y, double z, double vX, double vY, double vZ, int... args) {
         this(w, x, y, z, args[0], args[1], args[2]/255F);
+
+        this.motionX = vX;
+        this.motionY = vY;
+        this.motionZ = vZ;
     }
 
     public ParticleSphere(World w, double x, double y, double z, int radius, int tint, float alpha) {
@@ -36,9 +38,8 @@ public class ParticleSphere extends Particle implements IAttachableParticle {
         this.radius = radius;
         this.tint = tint;
         this.alpha = alpha;
-        this.baseAlpha = alpha;
 
-        this.setMaxAge(50000);
+        setMaxAge(10);
     }
 
     @Override
@@ -48,15 +49,15 @@ public class ParticleSphere extends Particle implements IAttachableParticle {
 
     @Override
     public void attachTo(ICaster<?> caster) {
+        setMaxAge(50000);
         this.caster = caster;
     }
 
     public void onUpdate() {
         super.onUpdate();
 
-        alpha = Math.min(1F, 1 - (float)particleAge/particleMaxAge) * baseAlpha;
-
-        if (caster == null || !caster.hasEffect() || caster.getEffect().getDead() || caster.getEntity().isDead) {
+        if (caster != null) {
+            if (!caster.hasEffect() || caster.getEffect().getDead() || caster.getEntity().isDead) {
                 setExpired();
             } else {
                 Entity e = caster.getEntity();
@@ -67,10 +68,15 @@ public class ParticleSphere extends Particle implements IAttachableParticle {
 
                 setPosition(e.posX, e.posY, e.posZ);
             }
+        } else {
+            if (this.rand.nextInt(10000) == 0) {
+                this.radius--;
+            }
+        }
     }
 
     public void renderParticle(BufferBuilder buffer, Entity viewer, float partialTicks, float x, float z, float yz, float xy, float xz) {
-        if (alpha <= 0) {
+        if (alpha <= 0 || radius <= 0) {
             return;
         }
 

src/main/java/com/minelittlepony/unicopia/spell/CasterUtils.java

@@ -5,6 +5,7 @@ import java.util.stream.Stream;
 
 import javax.annotation.Nullable;
 
+import com.google.common.collect.Streams;
 import com.minelittlepony.unicopia.Predicates;
 import com.minelittlepony.unicopia.player.PlayerSpeciesList;
 
@@ -54,6 +55,12 @@ public class CasterUtils {
                 .filter(e -> !e.getDead());
     }
 
+    public static boolean isHoldingEffect(String effectName, Entity entity) {
+        return Streams.stream(entity.getEquipmentAndArmor())
+            .map(SpellRegistry::getKeyFromStack)
+            .anyMatch(s -> s.equals(effectName));
+    }
+
     public static Optional<ICaster<?>> toCaster(@Nullable Entity entity) {
 
         if (entity instanceof ICaster<?>) {

src/main/java/com/minelittlepony/unicopia/spell/SpellDarkness.java

@@ -0,0 +1,131 @@
+package com.minelittlepony.unicopia.spell;
+
+import java.util.Random;
+
+import com.minelittlepony.unicopia.UParticles;
+import com.minelittlepony.unicopia.entity.EntitySpell;
+import com.minelittlepony.unicopia.particle.Particles;
+import com.minelittlepony.util.MagicalDamageSource;
+import com.minelittlepony.util.shape.Sphere;
+
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.entity.ai.EntityAIAvoidEntity;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.init.MobEffects;
+import net.minecraft.init.SoundEvents;
+import net.minecraft.potion.PotionEffect;
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvent;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Vec3d;
+
+public class SpellDarkness extends AbstractSpell.RangedAreaSpell {
+
+    final SoundEvent[] scarySounds = new SoundEvent[] {
+            SoundEvents.AMBIENT_CAVE,
+            SoundEvents.ENTITY_GHAST_SCREAM,
+            SoundEvents.ENTITY_ZOMBIE_AMBIENT,
+            SoundEvents.ENTITY_GHAST_AMBIENT,
+            SoundEvents.ENTITY_SKELETON_AMBIENT,
+            SoundEvents.ENTITY_SKELETON_SHOOT,
+            SoundEvents.ENTITY_ENDERDRAGON_GROWL,
+            SoundEvents.ENTITY_ENDERMEN_SCREAM,
+            SoundEvents.ENTITY_ZOMBIE_VILLAGER_AMBIENT
+    };
+
+    @Override
+    public String getName() {
+        return "darkness";
+    }
+
+    @Override
+    public int getTint() {
+        return 0x000000;
+    }
+
+    @Override
+    public boolean allowAI() {
+        return true;
+    }
+
+    @Override
+    public void onPlaced(ICaster<?> caster) {
+        if (caster.getEntity() instanceof EntitySpell) {
+            EntitySpell living = (EntitySpell)caster.getEntity();
+
+            living.tasks.addTask(1, new EntityAIAvoidEntity<>(living, EntityPlayer.class, 3, 4, 4));
+            living.height = 1.8F;
+
+            living.setPosition(living.posX, living.posY, living.posZ);
+        }
+    }
+
+    @Override
+    public boolean update(ICaster<?> source) {
+        int radius = 7 + (source.getCurrentLevel() * 3);
+
+        if (source.getWorld().rand.nextInt(15) == 0) {
+            source.getWorld().playSound(null, source.getOrigin(), getScarySoundEffect(source.getWorld().rand), SoundCategory.AMBIENT,
+                    0.2F + source.getWorld().rand.nextFloat(), 0.3F);
+        }
+        source.findAllEntitiesInRange(radius * 1.5F)
+            .filter(e -> e instanceof EntityLivingBase)
+            .map(EntityLivingBase.class::cast)
+            .forEach(e -> applyDarkness(source, e));
+
+        return false;
+    }
+
+    protected void applyDarkness(ICaster<?> source, EntityLivingBase entity) {
+        if (!CasterUtils.isHoldingEffect("light", entity)) {
+            entity.addPotionEffect(new PotionEffect(MobEffects.BLINDNESS, 100, 3));
+
+            Vec3d origin = source.getOriginVector();
+            Vec3d to = entity.getPositionVector();
+            double distance = origin.distanceTo(entity.getPositionVector());
+
+            if (entity.world.rand.nextInt(30) == 0) {
+                double appliedForce = distance / 10 + entity.world.rand.nextInt(3);
+                Vec3d force = origin.subtract(to).normalize().scale(appliedForce);
+
+                entity.addVelocity(force.x, force.y, force.z);
+            }
+
+            if (distance < 3 && entity.world.rand.nextInt(30) == 0) {
+                entity.attackEntityFrom(MagicalDamageSource.create("darkness"), 3);
+            }
+
+        } else {
+            if (entity.isPotionActive(MobEffects.BLINDNESS)) {
+                entity.removeActivePotionEffect(MobEffects.BLINDNESS);
+            }
+        }
+    }
+
+    protected SoundEvent getScarySoundEffect(Random rand) {
+        return scarySounds[rand.nextInt(scarySounds.length)];
+    }
+
+    @Override
+    public void render(ICaster<?> source) {
+        int radius = 7 + (source.getCurrentLevel() * 3);
+
+        source.spawnParticles(new Sphere(false, radius), radius * 6, pos -> {
+            if (!source.getWorld().isAirBlock(new BlockPos(pos).down())) {
+                int size = source.getWorld().rand.nextInt(4);
+
+                if (size > 0) {
+                    double vX = (source.getWorld().rand.nextFloat() - 0.5) * 2;
+                    double vZ = (source.getWorld().rand.nextFloat() - 0.5) * 2;
+
+                    Particles.instance().spawnParticle(UParticles.SPHERE, false, pos, vX, 0, vZ, size, getTint(), 100);
+                }
+            }
+        });
+    }
+
+    @Override
+    public SpellAffinity getAffinity() {
+        return SpellAffinity.BAD;
+    }
+}

src/main/java/com/minelittlepony/unicopia/spell/SpellDrake.java

@@ -17,8 +17,6 @@ public class SpellDrake extends AbstractSpell {
     @Nullable
     private IMagicEffect piggyBackSpell;
 
-    private boolean firstUpdate = true;
-
     @Override
     public String getName() {
         return "drake";
@@ -26,7 +24,7 @@ public class SpellDrake extends AbstractSpell {
 
     @Override
     public SpellAffinity getAffinity() {
-        return SpellAffinity.NEUTRAL;
+        return SpellAffinity.GOOD;
     }
 
     @Override
@@ -53,23 +51,21 @@ public class SpellDrake extends AbstractSpell {
     }
 
     @Override
-    public boolean update(ICaster<?> source) {
-
-        if (firstUpdate) {
-            firstUpdate = false;
-
-            if (source.getEntity() instanceof EntitySpell) {
-                EntitySpell living = (EntitySpell)source.getEntity();
+    public void onPlaced(ICaster<?> caster) {
+        if (caster.getEntity() instanceof EntitySpell) {
+            EntitySpell living = (EntitySpell)caster.getEntity();
 
             ((PathNavigateGround)living.getNavigator()).setCanSwim(false);
             living.tasks.addTask(1, new EntityAISwimming(living));
-                living.tasks.addTask(2, new EntityAIFollowCaster<>(source, 1, 4, 70));
+            living.tasks.addTask(2, new EntityAIFollowCaster<>(caster, 1, 4, 70));
             living.height = 1.8F;
 
             living.setPosition(living.posX, living.posY, living.posZ);
         }
     }
 
+    @Override
+    public boolean update(ICaster<?> source) {
         if (piggyBackSpell == null) {
             AxisAlignedBB bb = EFFECT_BOUNDS.offset(source.getOriginVector());
 

src/main/java/com/minelittlepony/unicopia/spell/SpellRegistry.java

@@ -43,6 +43,7 @@ public class SpellRegistry {
         registerSpell(SpellInferno::new);
         registerSpell(SpellDrake::new);
         registerSpell(SpellReveal::new);
+        registerSpell(SpellDarkness::new);
         registerSpell(GenericSpell.factory("light", 0xF7FACB, SpellAffinity.GOOD));
     }
 

src/main/resources/assets/unicopia/lang/en_US.lang

@@ -63,11 +63,17 @@ spell.ice.name=Frost
 spell.ice.tagline=Ice I
 
 spell.drake.name=Assistance
-spell.drake.tagline=Helpfulness I
+spell.drake.tagline=Golomancy I
 
 curse.shield.name=Repulsion
 curse.shield.tagline=Hostility I
 
+curse.darkness.name=Darkness
+curse.darkness.tagline=Golomancy I/Resurrection II
+
+curse.harm.name=Hurting
+curse.harm.tagline=Hostility II
+
 curse.awkward.name=Awkwardness
 curse.awkward.tagline=*Derp*
 
@@ -77,9 +83,6 @@ curse.vortex.tagline=Torture I
 curse.necromancy.name=Necromancy
 curse.necromancy.tagline=Resurrection I
 
-curse.drake.name=Assistance
-curse.drake.tagline=Unhelpfulness I
-
 curse.inferno.name=Inferno
 curse.inferno.tagline=Fire II
 
@@ -218,6 +221,7 @@ unicopia.power.disguise=Secondary Changeling ability
 
 unicopia.gui.title.bagofholding=Bag of Holding
 
+death.attack.darkness=%1$s went missing
 death.attack.feed=%1$s was drained of all life
 death.attack.feed.player=%1$s died to feed %2$s
 death.attack.cold=%1$s died of frost bite