minecraft-kajetans-mod/src/main/java/me/km/effects/active/Kick.java

package me.km.effects.active;

import me.km.api.Utils;
import me.km.effects.ActiveEffectBase;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.init.MobEffects;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.math.Vec3d;

public class Kick extends ActiveEffectBase
{
    @Override
    protected boolean executeEffect(EntityPlayerMP p, int power) 
    {
        EntityLivingBase liv = Utils.getTargetedEntity(p, 4, EntityLivingBase.class);
        if(liv == null)
        {
            return false;
        }
        Vec3d v = liv.getPositionVector().subtract(p.getPositionVector()).normalize().scale(2).addVector(0, 0.4, 0);
        Utils.setVelocity(liv, v.x, v.y, v.z);
        liv.addPotionEffect(new PotionEffect(MobEffects.NAUSEA, 120, 10));
        return true;
    }

    @Override
    protected int getManaCost(int manaFactor) 
    {
        return 4 * manaFactor;
    }
}