One little question

[Nicba1010]

Hey guys I have only one question.

Since I have never worked with bitwise operators I can't figure is out myself.

How would I check if a door is open?

Sincerely, Roberto

[shieldbug1]

Um. What?

 

The things don't relate to each other at all. Bit wise operator are just like normal operators.  AND, OR, XOR, etc.

 

I think what you mean is using bit wise operators in conjunction with metadata.

 

Block metadata is one byte (0 to 15, or 0000 to 1111). You'd need two bits of data to save the orientation of the door, and one bit of data to save whether the door is open or not.

 

 

[TheGreyGhost]

Hi

 

Some background

http://www.leepoint.net/notes-java/data/expressions/bitops.html

 

This code from vanilla might help you figure it out too

 

    public Icon getBlockTexture(IBlockAccess par1IBlockAccess, int wx, int wy, int wz, int side)
    {
        if (side != 1 && side != 0)
        {
            int metadata = this.getFullMetadata(par1IBlockAccess, wx, wy, wz);
            int doorFacingDirection = metadata & 3;
            boolean doorIsOpen = (metadata & 4) != 0;
            boolean flipLeftRight = false;
            boolean topHalf = (metadata &  != 0;

            if (doorIsOpen)
            {
                if (doorFacingDirection == 0 && side == 2)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 1 && side == 5)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 2 && side == 3)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 3 && side == 4)
                {
                    flipLeftRight = !flipLeftRight;
                }
            }
            else
            {
                if (doorFacingDirection == 0 && side == 5)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 1 && side == 3)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 2 && side == 4)
                {
                    flipLeftRight = !flipLeftRight;
                }
                else if (doorFacingDirection == 3 && side == 2)
                {
                    flipLeftRight = !flipLeftRight;
                }

                if ((metadata & 16) != 0)
                {
                    flipLeftRight = !flipLeftRight;
                }
            }

            return topHalf ? this.upperIcon[flipLeftRight ? 1 : 0] : this.lowerIcon[flipLeftRight ? 1 : 0];
        }
        else
        {
            return this.lowerIcon[0];
        }
    }

 

-TGG

 

[Nicba1010]

Thx shield and grey.

Yes shield that is what I meant

TGG thx for that piece, it was easy to figure out once I had an example.

Just so others can see:

 

    private boolean isDoorOpen(World world, int x, int y, int z) {
        int metadata = world.getBlockMetadata(x, y, z);
        return (metadata & 4) != 0;
    }