001package net.minecraft.entity;
002
003import net.minecraft.block.Block;
004import net.minecraft.util.MathHelper;
005import net.minecraft.world.World;
006
007public abstract class EntityFlying extends EntityLiving
008{
009    public EntityFlying(World par1World)
010    {
011        super(par1World);
012    }
013
014    /**
015     * Called when the mob is falling. Calculates and applies fall damage.
016     */
017    protected void fall(float par1) {}
018
019    /**
020     * Takes in the distance the entity has fallen this tick and whether its on the ground to update the fall distance
021     * and deal fall damage if landing on the ground.  Args: distanceFallenThisTick, onGround
022     */
023    protected void updateFallState(double par1, boolean par3) {}
024
025    /**
026     * Moves the entity based on the specified heading.  Args: strafe, forward
027     */
028    public void moveEntityWithHeading(float par1, float par2)
029    {
030        if (this.isInWater())
031        {
032            this.moveFlying(par1, par2, 0.02F);
033            this.moveEntity(this.motionX, this.motionY, this.motionZ);
034            this.motionX *= 0.800000011920929D;
035            this.motionY *= 0.800000011920929D;
036            this.motionZ *= 0.800000011920929D;
037        }
038        else if (this.handleLavaMovement())
039        {
040            this.moveFlying(par1, par2, 0.02F);
041            this.moveEntity(this.motionX, this.motionY, this.motionZ);
042            this.motionX *= 0.5D;
043            this.motionY *= 0.5D;
044            this.motionZ *= 0.5D;
045        }
046        else
047        {
048            float f2 = 0.91F;
049
050            if (this.onGround)
051            {
052                f2 = 0.54600006F;
053                int i = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
054
055                if (i > 0)
056                {
057                    f2 = Block.blocksList[i].slipperiness * 0.91F;
058                }
059            }
060
061            float f3 = 0.16277136F / (f2 * f2 * f2);
062            this.moveFlying(par1, par2, this.onGround ? 0.1F * f3 : 0.02F);
063            f2 = 0.91F;
064
065            if (this.onGround)
066            {
067                f2 = 0.54600006F;
068                int j = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
069
070                if (j > 0)
071                {
072                    f2 = Block.blocksList[j].slipperiness * 0.91F;
073                }
074            }
075
076            this.moveEntity(this.motionX, this.motionY, this.motionZ);
077            this.motionX *= (double)f2;
078            this.motionY *= (double)f2;
079            this.motionZ *= (double)f2;
080        }
081
082        this.prevLimbYaw = this.limbYaw;
083        double d0 = this.posX - this.prevPosX;
084        double d1 = this.posZ - this.prevPosZ;
085        float f4 = MathHelper.sqrt_double(d0 * d0 + d1 * d1) * 4.0F;
086
087        if (f4 > 1.0F)
088        {
089            f4 = 1.0F;
090        }
091
092        this.limbYaw += (f4 - this.limbYaw) * 0.4F;
093        this.limbSwing += this.limbYaw;
094    }
095
096    /**
097     * returns true if this entity is by a ladder, false otherwise
098     */
099    public boolean isOnLadder()
100    {
101        return false;
102    }
103}