From ec61713221292914cd8e9e12bb77fac9e76e42eb Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Sat, 9 Jun 2012 12:03:49 +0000
Subject: Cacti grow by themselves and by bonemeal

git-svn-id: http://mc-server.googlecode.com/svn/trunk@583 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/cChunk.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'source/cChunk.cpp')

diff --git a/source/cChunk.cpp b/source/cChunk.cpp
index 1b70e84d1..526300972 100644
--- a/source/cChunk.cpp
+++ b/source/cChunk.cpp
@@ -572,6 +572,7 @@ void cChunk::TickBlocks(MTRand & a_TickRandom)
 			case E_BLOCK_MELON_STEM:   TickMelonPumpkin(m_BlockTickX, m_BlockTickY, m_BlockTickZ, Index, ID, a_TickRandom); break;
 			case E_BLOCK_FARMLAND:     TickFarmland    (m_BlockTickX, m_BlockTickY, m_BlockTickZ); break;
 			case E_BLOCK_SUGARCANE:    GrowSugarcane   (m_BlockTickX, m_BlockTickY, m_BlockTickZ, 1); break;
+			case E_BLOCK_CACTUS:       GrowCactus      (m_BlockTickX, m_BlockTickY, m_BlockTickZ, 1); break;
 			
 			case E_BLOCK_SAPLING:
 			{
@@ -846,6 +847,52 @@ void cChunk::GrowSugarcane(int a_RelX, int a_RelY, int a_RelZ, int a_NumBlocks)
 		{
 			UnboundedRelFastSetBlock(a_RelX, Top + i, a_RelZ, E_BLOCK_SUGARCANE, 0);
 		}
+		else
+		{
+			break;
+		}
+	}  // for i
+}
+
+
+
+
+
+void cChunk::GrowCactus(int a_RelX, int a_RelY, int a_RelZ, int a_NumBlocks)
+{
+	// Check the total height of the sugarcane blocks here:
+	int Top = a_RelY + 1;
+	while (
+		(Top < cChunkDef::Height) &&
+		(GetBlock(a_RelX, Top, a_RelZ) == E_BLOCK_CACTUS)
+	)
+	{
+		++Top;
+	}
+	int Bottom = a_RelY - 1;
+	while (
+		(Bottom > 0) &&
+		(GetBlock(a_RelX, Bottom, a_RelZ) == E_BLOCK_CACTUS)
+	)
+	{
+		--Bottom;
+	}
+	
+	// Grow by at most a_NumBlocks, but no more than height 3:
+	int ToGrow = std::min(a_NumBlocks, 4 - (Top - Bottom));
+	for (int i = 0; i < ToGrow; i++)
+	{
+		BLOCKTYPE  BlockType;
+		NIBBLETYPE BlockMeta;
+		if (UnboundedRelGetBlock(a_RelX, Top + i, a_RelZ, BlockType, BlockMeta) && (BlockType == E_BLOCK_AIR))
+		{
+			// TODO: Check the surrounding blocks, if they aren't air, break the cactus block into pickups (and continue breaking blocks above in the next loop iterations)
+			UnboundedRelFastSetBlock(a_RelX, Top + i, a_RelZ, E_BLOCK_CACTUS, 0);
+		}
+		else
+		{
+			break;
+		}
 	}  // for i
 }
 
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