Hello guys, do you know how can I do a pushable entity? I tried using the code from EntityBoat and EntityMinecart; however, I always get a annoying effect: when the entity collides, it will sometimes go to the top of the other entity bounding box. I also noted that this happened with other mods as well. So, what is causing it?

 

Anyway, here is the current code that I'm using.

 

 

 

@Override

public boolean canBePushed()

{

return true;

}

 

@Override

public AxisAlignedBB getCollisionBox(Entity entity)

{

return entity.getEntityBoundingBox();

}

 

@Override

public AxisAlignedBB getBoundingBox()

{

return this.getEntityBoundingBox();

}

 

/** From minecart code */

protected void handlePushMotion()

{

if (this.worldObj.isRemote)

{

this.setPosition(this.posX, this.posY, this.posZ);

this.setRotation(this.rotationYaw, this.rotationPitch);

}

else

{

this.prevPosX = this.posX;

this.prevPosY = this.posY;

this.prevPosZ = this.posZ;

this.motionY -= 0.03999999910593033D;

int j = MathHelper.floor_double(this.posX);

int k = MathHelper.floor_double(this.posZ);

 

this.motionX = MathHelper.clamp_double(this.motionX, -0.4D, 0.4D);

this.motionZ = MathHelper.clamp_double(this.motionZ, -0.4D, 0.4D);

 

if (this.onGround)

{

this.motionX *= 0.5D;

this.motionY *= 0.5D;

this.motionZ *= 0.5D;

}

 

this.moveEntity(this.motionX, this.motionY, this.motionZ);

 

if (!this.onGround)

{

this.motionX *= 0.94999998807907104D;

this.motionZ *= 0.94999998807907104D;

if (this.inWater)

{

this.motionY -= 0.0125F;

if (this.motionY < -0.15F)

this.motionY = -0.15F;

}

else

{

this.motionY -= 0.025F;

if (this.motionY < -0.6F)

this.motionY = -0.6F;

}

}

 

this.doBlockCollisions();

this.rotationPitch = 0.0F;

double xDifference = this.prevPosX - this.posX;

double zDifference = this.prevPosZ - this.posZ;

 

if (xDifference * xDifference + zDifference * zDifference > 0.001D)

this.rotationYaw = (float) (Math.atan2(zDifference, xDifference) * 180.0D / Math.PI);

 

double d3 = MathHelper.wrapAngleTo180_float(this.rotationYaw - this.prevRotationYaw);

if (d3 < -170.0D || d3 >= 170.0D)

this.rotationYaw += 180.0F;

 

this.setRotation(this.rotationYaw, this.rotationPitch);

this.handleWaterMovement();

}

}

 

 

 

PS: What I really want is something similar to when you try to push a wolf that is sitting.

Theres some weird black magic that happens with the posY...

 

Anyway Ive gotten around it by using a dataWatcher to hold the posY data, so rather than changing the posY I update the datawatcher with that value and on the onUpdate method I do posY = getDataWatcher.getWatchableFloat(yourId)

 

Look at this: http://www.minecraftforge.net/wiki/Datawatcher

Actually I looked a bit into it, when an entity packet is sent this method is called in Entity.class

 

    @SideOnly(Side.CLIENT)

    public void func_180426_a(double p_180426_1_, double p_180426_3_, double p_180426_5_, float p_180426_7_, float p_180426_8_, int p_180426_9_, boolean p_180426_10_)

    {

        this.setPosition(p_180426_1_, p_180426_3_, p_180426_5_);

        this.setRotation(p_180426_7_, p_180426_8_);

        List list = this.worldObj.getCollidingBoundingBoxes(this, this.getEntityBoundingBox().contract(0.03125D, 0.0D, 0.03125D));

 

        if (!list.isEmpty())

        {

            double d3 = 0.0D;

            Iterator iterator = list.iterator();

 

            while (iterator.hasNext())

            {

                AxisAlignedBB axisalignedbb = (AxisAlignedBB)iterator.next();

 

                if (axisalignedbb.maxY > d3)

                {

                    d3 = axisalignedbb.maxY;

                }

            }

 

 

            //THIS BIT CAUSES IT    \/

            p_180426_3_ += d3 - this.getEntityBoundingBox().minY;

            this.setPosition(p_180426_1_, p_180426_3_, p_180426_5_);

        }

    }

 

So just override the  func_180426_a in your entity class with something suitable