1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
#pragma once
#include "BlockHandler.h"
class cBlockFireHandler :
public cBlockHandler
{
public:
cBlockFireHandler(BLOCKTYPE a_BlockType)
: cBlockHandler(a_BlockType),
XZP(0), XZM(0), Dir(0)
{
}
/// Portal boundary and direction variables
// 2014_03_30 _X: What are these used for? Why do we need extra variables?
int XZP, XZM;
NIBBLETYPE Dir;
virtual void OnPlaced(cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override
{
/*
PORTAL FINDING ALGORITH
=======================
- Get clicked base block
- Trace upwards to find first obsidian block; aborts if anything other than obsidian or air is encountered.
Uses this value as a reference (the 'ceiling')
- For both directions (if one fails, try the other), BASE (clicked) block:
- Go in one direction, only stop if a non obsidian block is encountered (abort) OR a portal border is encountered (FindObsidianCeiling returns -1)
- If a border was encountered, go the other direction and repeat above
- Write borders to XZP and XZM, write direction portal faces to Dir
- Loop through boundary variables, and fill with portal blocks based on Dir with meta from Dir
*/
// a_BlockY - 1: Because we want the block below the fire
FindAndSetPortalFrame(a_BlockX, a_BlockY - 1, a_BlockZ, a_ChunkInterface, a_WorldInterface);
}
virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
{
// No pickups from this block
}
virtual bool IsClickedThrough(void) override
{
return true;
}
/** Traces along YP until it finds an obsidian block, returns Y difference or 0 if no portal, and -1 for border
Takes the X, Y, and Z of the base block; with an optional MaxY for portal border finding */
int FindObsidianCeiling(int X, int Y, int Z, cChunkInterface & a_ChunkInterface, int MaxY = 0)
{
if (a_ChunkInterface.GetBlock(X, Y, Z) != E_BLOCK_OBSIDIAN)
{
return 0;
}
for (int newY = Y + 1; newY < cChunkDef::Height; newY++)
{
BLOCKTYPE Block = a_ChunkInterface.GetBlock(X, newY, Z);
if ((Block == E_BLOCK_AIR) || (Block == E_BLOCK_FIRE))
{
continue;
}
else if (Block == E_BLOCK_OBSIDIAN)
{
// We found an obsidian ceiling
// Make sure MaxY has a value and newY ('ceiling' location) is at one above the base block
// This is because the frame is a solid obsidian pillar
if ((MaxY != 0) && (newY == Y + 1))
{
return EvaluatePortalBorder(X, newY, Z, MaxY, a_ChunkInterface) ? -1 /* -1 = found a frame */ : 0;
}
else
{
// Return ceiling Y, whoever called this function will decide if it's part of a portal or not
return newY;
}
}
}
return 0;
}
/** Evaluates if coords have a valid border on top, based on MaxY */
bool EvaluatePortalBorder(int X, int FoundObsidianY, int Z, int MaxY, cChunkInterface & a_ChunkInterface)
{
for (int checkBorder = FoundObsidianY + 1; checkBorder <= MaxY - 1; checkBorder++) // FoundObsidianY + 1: FoundObsidianY has already been checked in FindObsidianCeiling; MaxY - 1: portal doesn't need corners
{
if (a_ChunkInterface.GetBlock(X, checkBorder, Z) != E_BLOCK_OBSIDIAN)
{
// Base obsidian, base + 1 obsidian, base + x NOT obsidian -> not complete portal
return false;
}
}
// Everything was obsidian, found a border!
return true;
}
/// Finds entire frame in any direction with the coordinates of a base block and fills hole with nether portal (START HERE)
void FindAndSetPortalFrame(int X, int Y, int Z, cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface)
{
int MaxY = FindObsidianCeiling(X, Y, Z, a_ChunkInterface); // Get topmost obsidian block as reference for all other checks
int X1 = X + 1, Z1 = Z + 1, X2 = X - 1, Z2 = Z - 1; // Duplicate XZ values, add / subtract one as we've checked the original already the line above
if (MaxY == 0) // Oh noes! Not a portal coordinate :(
{
return;
}
if (!FindPortalSliceX(X1, X2, Y, Z, MaxY, a_ChunkInterface))
{
if (!FindPortalSliceZ(X, Y, Z1, Z2, MaxY, a_ChunkInterface))
{
return; // No eligible portal construct, abort abort abort!!
}
}
for (int Height = Y + 1; Height <= MaxY - 1; Height++) // Loop through boundary to set portal blocks
{
for (int Width = XZM; Width <= XZP; Width++)
{
if (Dir == 1)
{
a_ChunkInterface.SetBlock(Width, Height, Z, E_BLOCK_NETHER_PORTAL, Dir);
}
else
{
a_ChunkInterface.SetBlock(X, Height, Width, E_BLOCK_NETHER_PORTAL, Dir);
}
}
}
return;
}
/** Evaluates if coordinates are a portal going XP / XM; returns true if so, and writes boundaries to variable
Takes coordinates of base block and Y coord of target obsidian ceiling */
bool FindPortalSliceX(int X1, int X2, int Y, int Z, int MaxY, cChunkInterface & a_ChunkInterface)
{
Dir = 1; // Set assumed direction (will change if portal turns out to be facing the other direction)
bool FoundFrameXP = false, FoundFrameXM = false;
for (; ((a_ChunkInterface.GetBlock(X1, Y, Z) == E_BLOCK_OBSIDIAN) || (a_ChunkInterface.GetBlock(X1, Y + 1, Z) == E_BLOCK_OBSIDIAN)); X1++) // Check XP for obsidian blocks, exempting corners
{
int Value = FindObsidianCeiling(X1, Y, Z, a_ChunkInterface, MaxY);
int ValueTwo = FindObsidianCeiling(X1, Y + 1, Z, a_ChunkInterface, MaxY); // For corners without obsidian
if ((Value == -1) || (ValueTwo == -1)) // FindObsidianCeiling returns -1 upon frame-find
{
FoundFrameXP = true; // Found a frame border in this direction, proceed in other direction (don't go further)
break;
}
else if ((Value != MaxY) && (ValueTwo != MaxY)) // Make sure that there is a valid portal 'slice'
{
return false; // Not valid slice, no portal can be formed
}
}
XZP = X1 - 1; // Set boundary of frame interior
for (; ((a_ChunkInterface.GetBlock(X2, Y, Z) == E_BLOCK_OBSIDIAN) || (a_ChunkInterface.GetBlock(X2, Y + 1, Z) == E_BLOCK_OBSIDIAN)); X2--) // Go the other direction (XM)
{
int Value = FindObsidianCeiling(X2, Y, Z, a_ChunkInterface, MaxY);
int ValueTwo = FindObsidianCeiling(X2, Y + 1, Z, a_ChunkInterface, MaxY);
if ((Value == -1) || (ValueTwo == -1))
{
FoundFrameXM = true;
break;
}
else if ((Value != MaxY) && (ValueTwo != MaxY))
{
return false;
}
}
XZM = X2 + 1; // Set boundary, see previous
return (FoundFrameXP && FoundFrameXM);
}
/// Evaluates if coords are a portal going ZP / ZM; returns true if so, and writes boundaries to variable
bool FindPortalSliceZ(int X, int Y, int Z1, int Z2, int MaxY, cChunkInterface & a_ChunkInterface)
{
Dir = 2;
bool FoundFrameZP = false, FoundFrameZM = false;
for (; ((a_ChunkInterface.GetBlock(X, Y, Z1) == E_BLOCK_OBSIDIAN) || (a_ChunkInterface.GetBlock(X, Y + 1, Z1) == E_BLOCK_OBSIDIAN)); Z1++)
{
int Value = FindObsidianCeiling(X, Y, Z1, a_ChunkInterface, MaxY);
int ValueTwo = FindObsidianCeiling(X, Y + 1, Z1, a_ChunkInterface, MaxY);
if ((Value == -1) || (ValueTwo == -1))
{
FoundFrameZP = true;
break;
}
else if ((Value != MaxY) && (ValueTwo != MaxY))
{
return false;
}
}
XZP = Z1 - 1;
for (; ((a_ChunkInterface.GetBlock(X, Y, Z2) == E_BLOCK_OBSIDIAN) || (a_ChunkInterface.GetBlock(X, Y + 1, Z2) == E_BLOCK_OBSIDIAN)); Z2--)
{
int Value = FindObsidianCeiling(X, Y, Z2, a_ChunkInterface, MaxY);
int ValueTwo = FindObsidianCeiling(X, Y + 1, Z2, a_ChunkInterface, MaxY);
if ((Value == -1) || (ValueTwo == -1))
{
FoundFrameZM = true;
break;
}
else if ((Value != MaxY) && (ValueTwo != MaxY))
{
return false;
}
}
XZM = Z2 + 1;
return (FoundFrameZP && FoundFrameZM);
}
};
|
