1 files changed, 91 insertions, 0 deletions

diff --git a/src/Piston.h b/src/Piston.h
new file mode 100644
index 000000000..92ddf6938
--- /dev/null
+++ b/src/Piston.h
@@ -0,0 +1,91 @@
+
+#pragma once
+
+
+
+
+
+// fwd: World.h
+class cWorld;
+
+
+
+
+
+class cPiston
+{
+public:
+
+	cPiston(cWorld * a_World);
+
+	static NIBBLETYPE RotationPitchToMetaData(double a_Rotation, double a_Pitch)
+	{
+		if (a_Pitch >= 50)
+		{
+			return 0x1;
+		}
+		else if (a_Pitch <= -50)
+		{
+			return 0x0;
+		}
+		else
+		{
+			a_Rotation += 90 + 45;  // So its not aligned with axis
+
+			if (a_Rotation > 360)
+			{
+				a_Rotation -= 360;
+			}
+			if ((a_Rotation >= 0) && (a_Rotation < 90))
+			{
+				return 0x4;
+			}
+			else if ((a_Rotation >= 180) && (a_Rotation < 270))
+			{
+				return 0x5;
+			}
+			else if ((a_Rotation >= 90) && (a_Rotation < 180))
+			{
+				return 0x2;
+			}
+			else
+			{
+				return 0x3;
+			}
+		}
+	}
+
+	void ExtendPiston( int, int, int );
+	void RetractPiston( int, int, int );
+	
+	/// Returns true if the piston (specified by blocktype) is a sticky piston
+	static bool IsSticky(BLOCKTYPE a_BlockType);
+	
+	/// Returns true if the piston (with the specified meta) is extended
+	static bool IsExtended(NIBBLETYPE a_PistonMeta);
+	
+	/// Returns true if the specified block can be pushed by a piston (and left intact)
+	static bool CanPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+	
+	/// Returns true if the specified block can be pushed by a piston and broken / replaced
+	static bool CanBreakPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+	
+	/// Returns true if the specified block can be pulled by a sticky piston
+	static bool CanPull(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+	
+	/// Updates the coords by the specified amount in the direction a piston of the specified meta is facing
+	static void AddDir(int & a_BlockX, int & a_BlockY, int & a_BlockZ, NIBBLETYPE a_PistonMeta, int a_Amount);
+	
+	
+	cWorld * m_World;
+
+private:
+	void ChainMove( int, int, int, char, unsigned short * );
+	
+	/// Returns how many blocks the piston has to push (where the first free space is); <0 when unpushable
+	int FirstPassthroughBlock(int a_PistonX, int a_PistonY, int a_PistonZ, NIBBLETYPE a_PistonMeta);
+} ;
+
+
+
+