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
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file tilearea.cpp Handling of tile areas. */
#include "stdafx.h"
#include "map_func.h"
#include "tilearea_type.h"
/**
* Construct this tile area based on two points.
* @param start the start of the area
* @param end the end of the area
*/
TileArea::TileArea(TileIndex start, TileIndex end)
{
uint sx = TileX(start);
uint sy = TileY(start);
uint ex = TileX(end);
uint ey = TileY(end);
if (sx > ex) Swap(sx, ex);
if (sy > ey) Swap(sy, ey);
this->tile = TileXY(sx, sy);
this->w = ex - sx + 1;
this->h = ey - sy + 1;
}
/**
* Add a single tile to a tile area; enlarge if needed.
* @param to_add The tile to add
*/
void TileArea::Add(TileIndex to_add)
{
if (this->tile == INVALID_TILE) {
this->tile = to_add;
this->w = 1;
this->h = 1;
return;
}
uint sx = TileX(this->tile);
uint sy = TileY(this->tile);
uint ex = sx + this->w - 1;
uint ey = sy + this->h - 1;
uint ax = TileX(to_add);
uint ay = TileY(to_add);
sx = min(ax, sx);
sy = min(ay, sy);
ex = max(ax, ex);
ey = max(ay, ey);
this->tile = TileXY(sx, sy);
this->w = ex - sx + 1;
this->h = ey - sy + 1;
}
/**
* Does this tile area intersect with another?
* @param ta the other tile area to check against.
* @return true if they intersect.
*/
bool TileArea::Intersects(const TileArea &ta) const
{
if (ta.w == 0 || this->w == 0) return false;
assert(ta.w != 0 && ta.h != 0 && this->w != 0 && this->h != 0);
uint left1 = TileX(this->tile);
uint top1 = TileY(this->tile);
uint right1 = left1 + this->w - 1;
uint bottom1 = top1 + this->h - 1;
uint left2 = TileX(ta.tile);
uint top2 = TileY(ta.tile);
uint right2 = left2 + ta.w - 1;
uint bottom2 = top2 + ta.h - 1;
return !(
left2 > right1 ||
right2 < left1 ||
top2 > bottom1 ||
bottom2 < top1
);
}
/**
* Clamp the tile area to map borders.
*/
void TileArea::ClampToMap()
{
assert(this->tile < MapSize());
this->w = min(this->w, MapSizeX() - TileX(this->tile));
this->h = min(this->h, MapSizeY() - TileY(this->tile));
}
DiagonalTileIterator::DiagonalTileIterator(TileIndex corner1, TileIndex corner2) : TileIterator(corner2), base_x(TileX(corner2)), base_y(TileY(corner2)), a_cur(0), b_cur(0)
{
assert(corner1 < MapSize());
assert(corner2 < MapSize());
int dist_x = TileX(corner1) - TileX(corner2);
int dist_y = TileY(corner1) - TileY(corner2);
this->a_max = dist_x + dist_y;
this->b_max = dist_y - dist_x;
/* Unfortunately we can't find a new base and make all a and b positive because
* the new base might be a "flattened" corner where there actually is no single
* tile. If we try anyway the result is either inaccurate ("one off" half of the
* time) or the code gets much more complex;
*
* We also need to increment here to have equality as marker for the end of a row or
* column. Like that it's shorter than having another if/else in operator++
*/
if (this->a_max > 0) {
this->a_max++;
} else {
this->a_max--;
}
if (this->b_max > 0) {
this->b_max++;
} else {
this->b_max--;
}
}
TileIterator &DiagonalTileIterator::operator++()
{
assert(this->tile != INVALID_TILE);
do {
/* Iterate using the rotated coordinates. */
if (this->a_max > 0) {
++this->a_cur;
} else {
--this->a_cur;
}
if (this->a_cur == this->a_max) {
this->a_cur = 0;
if (this->b_max > 0) {
++this->b_cur;
} else {
--this->b_cur;
}
}
/* And convert the coordinates back once we've gone to the next tile. */
uint x = this->base_x + (this->a_cur - this->b_cur) / 2;
uint y = this->base_y + (this->b_cur + this->a_cur) / 2;
/* Prevent wrapping around the map's borders. */
this->tile = x >= MapSizeX() || y >= MapSizeY() ? INVALID_TILE : TileXY(x, y);
} while (this->tile > MapSize() && this->b_max != this->b_cur);
if (this->b_max == this->b_cur) this->tile = INVALID_TILE;
return *this;
}
|
