BiomesOPlenty/common/biomesoplenty/entities/EntityBird.java

package biomesoplenty.entities;

import biomesoplenty.api.Items;
import net.minecraft.block.material.Material;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;

public class EntityBird extends EntityFlyingMob
{
    public int courseChangeCooldown;
    public double waypointX;
    public double waypointY;
    public double waypointZ;
    
    public EntityBird(World world)
    {
        super(world); 
        this.setSize(1.0F, 1.0F);
    }
    
    @Override
    protected void updateEntityActionState()
    {
        double d0 = this.waypointX - this.posX;
        double d1 = this.waypointY - this.posY;
        double d2 = this.waypointZ - this.posZ;
        double d3 = d0 * d0 + d1 * d1 + d2 * d2;

        if (d3 < 1.0D || d3 > 3600.0D)
        {
            this.waypointX = this.posX + (double)((this.rand.nextFloat() * 8.0F - 4.0F) * 6.0F);
            this.waypointY = this.posY + (double)((this.rand.nextFloat() * 2.0F - 1.0F) * 6.0F);
            this.waypointZ = this.posZ + (double)((this.rand.nextFloat() * 8.0F - 4.0F) * 6.0F);
        }

        if (this.courseChangeCooldown-- <= 0)
        {
            this.courseChangeCooldown += this.rand.nextInt(2) + 2;
            d3 = (double)MathHelper.sqrt_double(d3);

            if (this.isCourseTraversable(this.waypointX, this.waypointY, this.waypointZ, d3))
            {
                this.motionX += d0 / d3 * 0.1D;
                this.motionY += d1 / d3 * 0.1D;
                this.motionZ += d2 / d3 * 0.1D;
            }
            else
            {
                this.waypointX = this.posX;
                this.waypointY = this.posY;
                this.waypointZ = this.posZ;
            }
        }
        
        this.renderYawOffset = this.rotationYaw = -((float)Math.atan2(this.motionX, this.motionZ)) * 180.0F / (float)Math.PI;
    }

    private boolean isCourseTraversable(double par1, double par3, double par5, double par7)
    {
        double d4 = (this.waypointX - this.posX) / par7;
        double d5 = (this.waypointY - this.posY) / par7;
        double d6 = (this.waypointZ - this.posZ) / par7;
        AxisAlignedBB axisalignedbb = this.boundingBox.copy();

        for (int i = 1; (double)i < par7; ++i)
        {
            axisalignedbb.offset(d4, d5, d6);
            
            if (!this.worldObj.getCollidingBoundingBoxes(this, axisalignedbb).isEmpty() 
               || this.isInWater() ? 
                        this.worldObj.getBlockMaterial(MathHelper.floor_double(this.waypointX), MathHelper.floor_double(this.waypointY), MathHelper.floor_double(this.waypointZ)) == Material.water
               : this.worldObj.isAnyLiquid(axisalignedbb))
            {
                return false;
            }
        }

        return true;
    }
    
	@Override
	protected void dropFewItems(boolean par1, int par2)
	{
		int var3 = rand.nextInt(3) + rand.nextInt(1 + par2);

		for (int var4 = 0; var4 < var3; ++var4)
		{
			this.entityDropItem(new ItemStack(Item.feather, 1, 1), 0.0F);
		}
	}
    
    @Override
    protected String getLivingSound()
    {
        return "biomesoplenty:mob.bird.say";
    }

    @Override
    protected String getHurtSound()
    {
        return "biomesoplenty:mob.bird.hurt";
    }

    @Override
    protected String getDeathSound()
    {
        return "biomesoplenty:mob.bird.hurt";
    }
}