From 5fe7008966f70de2af53cce7fc13014c220ab721 Mon Sep 17 00:00:00 2001
From: madmaxoft <github@xoft.cz>
Date: Sun, 4 Aug 2013 13:25:48 +0200
Subject: First attempt at implementing a cLineBlockTracer class

Not yet tested, will probably have lots of bugs, if it is at all usable.
---
 source/LineBlockTracer.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 source/LineBlockTracer.h

(limited to 'source/LineBlockTracer.h')

diff --git a/source/LineBlockTracer.h b/source/LineBlockTracer.h
new file mode 100644
index 000000000..4616cb191
--- /dev/null
+++ b/source/LineBlockTracer.h
@@ -0,0 +1,84 @@
+
+// LineBlockTracer.h
+
+// Declares the cLineBlockTracer class representing a cBlockTracer that traces along a straight line between two points
+
+
+
+
+
+#pragma once
+
+#include "BlockTracer.h"
+
+
+
+
+
+// fwd: Chunk.h
+class cChunk;
+
+// fwd: cChunkMap.h
+typedef cItemCallback<cChunk> cChunkCallback;
+
+
+
+
+
+
+class cLineBlockTracer :
+	public cBlockTracer,
+	public cChunkCallback
+{
+	typedef cBlockTracer super;
+	
+public:
+	cLineBlockTracer(cWorld & a_World, cCallbacks & a_Callbacks);
+	
+	/// Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits())
+	bool Trace(double a_StartX, double a_StartY, double a_StartZ, double a_EndX, double a_EndY, double a_EndZ);
+
+	// Utility functions for simple one-line usage:
+	/// Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits())
+	static bool Trace(cWorld & a_World, cCallbacks & a_Callbacks, double a_StartX, double a_StartY, double a_StartZ, double a_EndX, double a_EndY, double a_EndZ);
+
+	/// Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits())
+	static bool Trace(cWorld & a_World, cCallbacks & a_Callbacks, const Vector3d & a_Start, const Vector3d & a_End);
+	
+protected:
+	// The start point of the trace
+	double m_StartX, m_StartY, m_StartZ;
+	
+	// The end point of the trace
+	double m_EndX, m_EndY, m_EndZ;
+	
+	// The difference in coords, End - Start
+	double m_DiffX, m_DiffY, m_DiffZ;
+	
+	// The increment at which the block coords are going from Start to End; either +1 or -1
+	int m_DirX, m_DirY, m_DirZ;
+	
+	// The current block
+	int m_CurrentX, m_CurrentY, m_CurrentZ;
+
+	
+	/// Adjusts the start point above the world to just at the world's top
+	void FixStartAboveWorld(void);
+	
+	/// Adjusts the start point below the world to just at the world's bottom
+	void FixStartBelowWorld(void);
+	
+	/// Calculates the XZ coords of an intersection with the specified Yconst plane; assumes that such an intersection exists
+	void CalcXZIntersection(double a_Y, double & a_IntersectX, double & a_IntersectZ);
+	
+	/// Moves m_Current to the next block on the line; returns false if no move is possible (reached the end)
+	bool MoveToNextBlock(void);
+	
+	// cChunkCallback overrides:
+	virtual bool Item(cChunk * a_Chunk) override;
+} ;
+
+
+
+
+
-- 
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