ClientEventHandler.java

package com.wesserboy.inWorldStorage.client.events;

import com.wesserboy.inWorldStorage.blocks.BlockVisionMover;

import net.minecraft.block.state.IBlockState;
import net.minecraft.client.Minecraft;
import net.minecraft.entity.Entity;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.TickEvent;
import net.minecraftforge.fml.common.gameevent.TickEvent.RenderTickEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

@SideOnly(Side.CLIENT)
public class ClientEventHandler {
	
	double orgX;
	double orgY;
	double orgZ;
	
	double orgPrevX;
	double orgPrevY;
	double orgPrevZ;
	
	boolean wasChanged;
	boolean wasOnBlockPrevTick;
	
	@SubscribeEvent
	public void onRenderTick(RenderTickEvent event){
		Minecraft mc = Minecraft.getMinecraft();
		
		if(event.phase == TickEvent.Phase.START){
			if(mc.thePlayer != null && mc.theWorld != null){
				
				IBlockState blockBelow = mc.theWorld.getBlockState((new BlockPos(mc.thePlayer)).add(0, -1, 0));
				if(blockBelow.getBlock() instanceof BlockVisionMover){
					wasOnBlockPrevTick = true;
					
					//Hardcoded position for testing purposes, eventually fetched using packets.
					BlockPos newPos = new BlockPos(mc.thePlayer.posX + 200, mc.thePlayer.posY + 3, mc.thePlayer.posZ);
					
					Entity e = mc.getRenderViewEntity();
					
					orgX = e.posX;
					orgY = e.posY;
					orgZ = e.posZ;
					
					orgPrevX = e.prevPosX;
					orgPrevY = e.prevPosY;
					orgPrevZ = e.prevPosZ;
					
					e.lastTickPosX = e.prevPosX = e.posX = newPos.getX() + 0.5D;
					e.lastTickPosY = e.prevPosY = e.posY = newPos.getY() + 0.5D;
					e.lastTickPosZ = e.prevPosZ = e.posZ = newPos.getZ() + 0.5D;
					
					wasChanged = true;
					
					if(mc.theWorld.getChunkFromBlockCoords(newPos).isEmpty()){
						//System.out.println("The chunk is not loaded!");
						mc.theWorld.getChunkProvider().loadChunk(newPos.getX() / 16, newPos.getZ() / 16);
					}
					
				}else{
					if(wasOnBlockPrevTick){
						for(int i = -mc.gameSettings.renderDistanceChunks; i <= mc.gameSettings.renderDistanceChunks; i++){
							for(int j = -mc.gameSettings.renderDistanceChunks; j<= mc.gameSettings.renderDistanceChunks; j++){
								BlockPos blockInChunk = mc.thePlayer.getPosition();
								blockInChunk = blockInChunk.add(16 * i, 0, 16 * j);
								System.out.println("Chunk at: " + blockInChunk.getX()/16 + ", " + blockInChunk.getZ()/16 + " marked dirty");
								mc.theWorld.markChunkDirty(blockInChunk, null);
							}
						}
						
						wasOnBlockPrevTick = false;
					}
				}
			}
		}else{
			
			if(wasChanged){
				Entity e = mc.getRenderViewEntity();
				
				e.prevPosX = orgPrevX;
				e.prevPosY = orgPrevY;
				e.prevPosZ = orgPrevZ;
				
				e.posX = orgX;
				e.posY = orgY;
				e.posZ = orgZ;
				
				wasChanged = false;
			}
		}
	}

}