CustomNPC-Plus/src/main/java/noppes/npcs/ai/EntityAIPounceTarget.java

package noppes.npcs.ai;

import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.ai.EntityAIBase;
import net.minecraft.util.MathHelper;
import noppes.npcs.entity.EntityNPCInterface;

public class EntityAIPounceTarget extends EntityAIBase {
	private EntityNPCInterface npc;
	private EntityLivingBase leapTarget;
	private float leapSpeed = 1.2F;

    public EntityAIPounceTarget(EntityNPCInterface leapingEntity){
        this.npc = leapingEntity;
        this.setMutexBits(4);
    }

    @Override
    public boolean shouldExecute(){
        if(!this.npc.onGround) 
        	return false;
        
        this.leapTarget = this.npc.getAttackTarget();
        
        if (this.leapTarget == null || !this.npc.getEntitySenses().canSee(leapTarget)) 
        	return false;
        
        return !npc.isInRange(leapTarget, 4) && npc.isInRange(leapTarget, 8) && this.npc.getRNG().nextInt(5) == 0;
    }

    @Override
    public boolean continueExecuting(){
        return !this.npc.onGround;
    }

    @Override
    public void startExecuting(){
    	double varX = this.leapTarget.posX - this.npc.posX;
		double varY = this.leapTarget.boundingBox.minY - this.npc.boundingBox.minY;
		double varZ = this.leapTarget.posZ - this.npc.posZ;
		float varF = MathHelper.sqrt_double(varX * varX + varZ * varZ);
		float angle = this.getAngleForXYZ(varX, varY, varZ, varF);
        float yaw = (float)(Math.atan2(varX, varZ) * 180.0D / Math.PI);
        this.npc.motionX = (double)(MathHelper.sin(yaw / 180.0F * (float)Math.PI) * MathHelper.cos(angle / 180.0F * (float)Math.PI));
        this.npc.motionZ = (double)(MathHelper.cos(yaw / 180.0F * (float)Math.PI) * MathHelper.cos(angle / 180.0F * (float)Math.PI));
        this.npc.motionY = (double)(MathHelper.sin((angle + 1.0F) / 180.0F * (float)Math.PI));
        this.npc.motionX *= this.leapSpeed;
        this.npc.motionZ *= this.leapSpeed;
        this.npc.motionY *= this.leapSpeed;
    }
    
    public float getAngleForXYZ(double varX, double varY, double varZ, double horiDist) {
    	float g = 0.1F;
    	float var1 = this.leapSpeed * this.leapSpeed;
    	double var2 = (g * horiDist);
    	double var3 = ((g * horiDist * horiDist) + (2 * varY * var1));
    	double var4 = (var1 * var1) - (g * var3);
    	if (var4 < 0) return 90.0F;
    	float var6 = var1 - MathHelper.sqrt_double(var4);
    	float var7 = (float) (Math.atan2(var6 , var2) * 180.0D / Math.PI);
    	return var7;
    }
}