Calculate size of worldborder based on zone center and map center?

[Toma™]

Hello everyone, I'm attempting to create shrinking zone system (like pubg and other BRs). I'm working on way to control it throught commands and in order to save it all I've made capability just for that. It all works fine.

When creating the map you have to specify the map center and map size. When you run command to start the game, center of world border is calculated based on these values. But I need to have dynamic size of the world border to prevent it blocking some parts of the map. I have tried few things, but nothing was precise. So I am asking the Minecraft community if somebody is more experienced with all this maths stuff to help me with this. I want to be able to have always 2 sides of the map inside the border (I know I can't have all on square map with offset world border - so the other 2 sides of the border will be longer than the map size, but that doesn't matter).

So what I have tried (the part of the code responsible for calculating the border size and center) :

Spoiler

	private void startGame(IGameData data, World world)
	{
		WorldBorder border = world.getWorldBorder();
		BlockPos center = data.getMapCenter();
		int size = data.getMapSize();
		
		BlockPos zoneCenter = new BlockPos(generateZoneCenterX(center, size), 256, generateZoneCenterZ(center, size));
		
		while(world.isAirBlock(zoneCenter))
		{
			zoneCenter = new BlockPos(zoneCenter.getX(), zoneCenter.getY() - 1, zoneCenter.getZ());
			if(world.getBlockState(zoneCenter).getMaterial().isLiquid())
			{
				Pubgmc.logger.info("Generating new zone center...");
				zoneCenter = new BlockPos(generateZoneCenterX(zoneCenter, size), 256, generateZoneCenterZ(zoneCenter, size));
			}
		}
		
		// ATTEMP 1
		/*int rangeX = Math.abs(center.getX() - zoneCenter.getX());
		int rangeZ = Math.abs(center.getZ() - zoneCenter.getZ());
		double totalDistance = Math.sqrt(sqr(rangeX) + sqr(rangeZ));*/
		
		//ATEMP 2
		int totalDistance = Math.abs(center.getX() - zoneCenter.getX()) + Math.abs(center.getZ() - zoneCenter.getZ());
		
		border.setCenter(zoneCenter.getX(), zoneCenter.getZ());
		border.setTransition(size + totalDistance);
	}

 

 

 

GitHub

Edited February 11, 2019 by Toma™

[Cadiboo]

I would recommend writing out what you’re trying to do on paper (or in a image editor on your computer) and finding the maths you need to understand that way

[Draco18s]

On 2/10/2019 at 12:36 PM, Toma™ said:

specify the map center and map size. When you run command to start the game, center of world border is calculated based on these values

So, uh, center = center and size = size? 

Not much to compute there.

On 2/10/2019 at 12:36 PM, Toma™ said:

But I need to have dynamic size of the world border to prevent it blocking some parts of the map.

So you need to move or resize the world border based on the players location? 

Well. Move the center to the player's location and set the size to some value while they're inside the unrestricted region. ..

[Toma™]

47 minutes ago, Draco18s said:

So, uh, center = center and size = size? 

Not much to compute there.

So you need to move or resize the world border based on the players location? 

Well. Move the center to the player's location and set the size to some value while they're inside the unrestricted region. ..

I think you misunderstood my post a bit.

What I meant is this:

- I have map where I defined the map center (zone minimal offset) and map size (zone maximal offset). Then random zone center is calculated based on these values -> Zone center is between these 2 points.

- The default zone size is the map size multiplied by 2

- But since the map is being offset from the map center, the zone corners don't cover all maps corners (obviously). So I'm looking for a way to calculate the new zone size based on the map size*2 and the zone's offset from the map center. I've been trying some triangle math here, but that didn't work. I'm trying to always have 2 corners of the zone cover 2 corners of the map and the other 2 zone corners to stick away from the map. So far I managed to get it to work with 1 side of the zone, but now I'm completely lost.

 

I will post GitHub link to my first post with updated code & my attempts.

[Toma™]

As I'm thinking about it, I won't be able to have 2 corners inside the map because I have 2 squares and one of them is misplaced from the center, so having making this would be impossible right?

[Draco18s]

3 hours ago, Toma™ said:

But since the map is being offset from the map

You have used this word twice with two different meanings. I cannot follow your question.

[Cadiboo]

On 2/11/2019 at 12:38 PM, Cadiboo said:

would recommend writing out what you’re trying to do on paper (or in a image editor on your computer)

I would recommend posting a visual to describe your problem