Add parrying mechanic to custom fireballs, fixes #335

src/main/java/electroblob/wizardry/entity/projectile/EntityMagicFireball.java

@@ -9,11 +9,15 @@ import electroblob.wizardry.util.ParticleBuilder;
 import io.netty.buffer.ByteBuf;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLiving;
+import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.projectile.EntitySmallFireball;
 import net.minecraft.init.Blocks;
 import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.util.DamageSource;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.RayTraceResult;
+import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
 import net.minecraftforge.event.entity.EntityJoinWorldEvent;
 import net.minecraftforge.fml.common.Mod;
@@ -131,6 +135,54 @@ public class EntityMagicFireball extends EntityMagicProjectile {
 		}
 	}
 
+	@Override
+	public boolean canBeCollidedWith(){
+		return true;
+	}
+
+	@Override
+	public float getCollisionBorderSize(){
+		return 1.0F;
+	}
+
+	@Override
+	public boolean attackEntityFrom(DamageSource source, float amount){
+
+		if(this.isEntityInvulnerable(source)){
+			return false;
+
+		}else{
+
+			this.markVelocityChanged();
+
+			if(source.getTrueSource() != null){
+
+				Vec3d vec3d = source.getTrueSource().getLookVec();
+
+				if(vec3d != null){
+
+					double speed = MathHelper.sqrt(motionX * motionX + motionY * motionY + motionZ * motionZ);
+
+					this.motionX = vec3d.x * speed;
+					this.motionY = vec3d.y * speed;
+					this.motionZ = vec3d.z * speed;
+
+					this.lifetime = 160;
+
+				}
+
+				if(source.getTrueSource() instanceof EntityLivingBase){
+					this.setCaster((EntityLivingBase)source.getTrueSource());
+				}
+
+				return true;
+
+			}else{
+				return false;
+			}
+		}
+	}
+
 	public void setLifetime(int lifetime){
 		this.lifetime = lifetime;
 	}