EntityFlying.java

package net.minecraft.entity;

import net.minecraft.block.Block;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;

public abstract class EntityFlying extends EntityLiving
{
    public EntityFlying(World par1World)
    {
        super(par1World);
    }

    /**
     * Called when the mob is falling. Calculates and applies fall damage.
     */
    protected void fall(float par1) {}

    /**
     * Takes in the distance the entity has fallen this tick and whether its on the ground to update the fall distance
     * and deal fall damage if landing on the ground.  Args: distanceFallenThisTick, onGround
     */
    protected void updateFallState(double par1, boolean par3) {}

    /**
     * Moves the entity based on the specified heading.  Args: strafe, forward
     */
    public void moveEntityWithHeading(float par1, float par2)
    {
        if (this.isInWater())
        {
            this.moveFlying(par1, par2, 0.02F);
            this.moveEntity(this.motionX, this.motionY, this.motionZ);
            this.motionX *= 0.800000011920929D;
            this.motionY *= 0.800000011920929D;
            this.motionZ *= 0.800000011920929D;
        }
        else if (this.handleLavaMovement())
        {
            this.moveFlying(par1, par2, 0.02F);
            this.moveEntity(this.motionX, this.motionY, this.motionZ);
            this.motionX *= 0.5D;
            this.motionY *= 0.5D;
            this.motionZ *= 0.5D;
        }
        else
        {
            float f2 = 0.91F;

            if (this.onGround)
            {
                f2 = 0.54600006F;
                int i = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));

                if (i > 0)
                {
                    f2 = Block.blocksList[i].slipperiness * 0.91F;
                }
            }

            float f3 = 0.16277136F / (f2 * f2 * f2);
            this.moveFlying(par1, par2, this.onGround ? 0.1F * f3 : 0.02F);
            f2 = 0.91F;

            if (this.onGround)
            {
                f2 = 0.54600006F;
                int j = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));

                if (j > 0)
                {
                    f2 = Block.blocksList[j].slipperiness * 0.91F;
                }
            }

            this.moveEntity(this.motionX, this.motionY, this.motionZ);
            this.motionX *= (double)f2;
            this.motionY *= (double)f2;
            this.motionZ *= (double)f2;
        }

        this.prevLimbYaw = this.limbYaw;
        double d0 = this.posX - this.prevPosX;
        double d1 = this.posZ - this.prevPosZ;
        float f4 = MathHelper.sqrt_double(d0 * d0 + d1 * d1) * 4.0F;

        if (f4 > 1.0F)
        {
            f4 = 1.0F;
        }

        this.limbYaw += (f4 - this.limbYaw) * 0.4F;
        this.limbSwing += this.limbYaw;
    }

    /**
     * returns true if this entity is by a ladder, false otherwise
     */
    public boolean isOnLadder()
    {
        return false;
    }
}