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

package me.km.effects.active;

import me.km.api.Utils;
import me.km.effects.ActiveEffectBase;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.util.math.Vec3d;

public class Jump extends ActiveEffectBase
{
    @Override
    protected boolean executeEffect(EntityPlayerMP p, int power) 
    {
        if(!p.onGround)
        {
            return false;
        }
        Vec3d v = p.getLookVec();
        double groundLength = Math.sqrt(v.xCoord * v.xCoord + v.zCoord * v.zCoord);
        Vec3d goal = new Vec3d(v.xCoord, groundLength * 1.732050807568877, v.zCoord); // 60° shot
        goal = goal.normalize();
        goal = goal.scale(Math.sqrt((power + 0.85d) / 0.26) / 4);
        Utils.setVelocity(p, goal.xCoord, goal.yCoord, goal.zCoord);
        return true;
    }

    @Override
    protected int getManaCost(int manaFactor) 
    {
        return 2 * manaFactor;
    }
}