equivalent-exchange-3/src/main/java/com/pahimar/ee3/client/handler/DrawBlockHighlightEventHandler.java

package com.pahimar.ee3.client.handler;

import com.pahimar.ee3.item.ItemDarkMatterPickAxe;
import com.pahimar.ee3.reference.ToolMode;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.RenderGlobal;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraftforge.client.event.DrawBlockHighlightEvent;
import net.minecraftforge.common.util.ForgeDirection;
import org.lwjgl.opengl.GL11;

@SideOnly(Side.CLIENT)
public class DrawBlockHighlightEventHandler
{
    @SubscribeEvent
    public void onDrawBlockHighlightEvent(DrawBlockHighlightEvent event)
    {
        if (event.currentItem != null)
        {
            if (event.target.typeOfHit == MovingObjectPosition.MovingObjectType.BLOCK)
            {
                if (event.currentItem.getItem() instanceof ItemDarkMatterPickAxe)
                {
                    event.setCanceled(true);
                    drawSelectionBoxForPickAxe(event);
                }
            }
        }
    }

    private void drawSelectionBoxForPickAxe(DrawBlockHighlightEvent event)
    {
        ToolMode toolMode = ((ItemDarkMatterPickAxe) event.currentItem.getItem()).getCurrentToolMode(event.currentItem);
        int facing = MathHelper.floor_double(event.player.rotationYaw * 4.0F / 360.0F + 0.5D) & 3;

        if (toolMode == ToolMode.STANDARD)
        {
            drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
        }
        else if (toolMode == ToolMode.WIDE)
        {
            drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);

            if (event.target.sideHit == ForgeDirection.NORTH.ordinal() || event.target.sideHit == ForgeDirection.SOUTH.ordinal())
            {
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX - 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX + 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
            }
            else if (event.target.sideHit == ForgeDirection.EAST.ordinal() || event.target.sideHit == ForgeDirection.WEST.ordinal())
            {
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ - 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ + 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
            }
            else
            {
                if (facing == 0 || facing == 2)
                {
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX - 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX + 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                }
                else
                {
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ - 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ + 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                }
            }
        }
        else if (toolMode == ToolMode.TALL)
        {
            drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);

            if (event.target.sideHit == ForgeDirection.NORTH.ordinal() || event.target.sideHit == ForgeDirection.SOUTH.ordinal() || event.target.sideHit == ForgeDirection.EAST.ordinal() || event.target.sideHit == ForgeDirection.WEST.ordinal())
            {
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY - 1, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY + 1, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
            }
            else
            {
                if (facing == 1 || facing == 3)
                {
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX - 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX + 1, event.target.blockY, event.target.blockZ, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                }
                else
                {
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ - 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                    drawSelectionBox(event.context, event.player, new MovingObjectPosition(event.target.blockX, event.target.blockY, event.target.blockZ + 1, event.target.sideHit, event.target.hitVec), 0, event.partialTicks);
                }
            }
        }
    }

    private void drawSelectionBox(RenderGlobal context, EntityPlayer entityPlayer, MovingObjectPosition rayTrace, int i, float partialTicks)
    {
        if (i == 0 && rayTrace.typeOfHit == MovingObjectPosition.MovingObjectType.BLOCK)
        {
            GL11.glEnable(GL11.GL_BLEND);
            OpenGlHelper.glBlendFunc(770, 771, 1, 0);
            GL11.glColor4f(1f, 1f, 1f, 0.5f);
            GL11.glLineWidth(3.0F);
            GL11.glDisable(GL11.GL_TEXTURE_2D);
            GL11.glDepthMask(false);
            float f1 = 0.002F;
            Block block = entityPlayer.worldObj.getBlock(rayTrace.blockX, rayTrace.blockY, rayTrace.blockZ);

            if (block.getMaterial() != Material.air)
            {
                block.setBlockBoundsBasedOnState(entityPlayer.worldObj, rayTrace.blockX, rayTrace.blockY, rayTrace.blockZ);
                double d0 = entityPlayer.lastTickPosX + (entityPlayer.posX - entityPlayer.lastTickPosX) * (double) partialTicks;
                double d1 = entityPlayer.lastTickPosY + (entityPlayer.posY - entityPlayer.lastTickPosY) * (double) partialTicks;
                double d2 = entityPlayer.lastTickPosZ + (entityPlayer.posZ - entityPlayer.lastTickPosZ) * (double) partialTicks;
                context.drawOutlinedBoundingBox(block.getSelectedBoundingBoxFromPool(entityPlayer.worldObj, rayTrace.blockX, rayTrace.blockY, rayTrace.blockZ).expand((double) f1, (double) f1, (double) f1).getOffsetBoundingBox(-d0, -d1, -d2), -1);
            }

            GL11.glDepthMask(true);
            GL11.glEnable(GL11.GL_TEXTURE_2D);
            GL11.glDisable(GL11.GL_BLEND);
        }
    }
}