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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
extern crate geojson;
extern crate num;
extern crate rayon;
extern crate serde_json;
extern crate imagefmt;
#[macro_use]
extern crate serde_derive;
#[cfg(feature="opencl")]
extern crate ocl;
use std::{f32, i32};
mod types;
pub use types::*;
mod match_shape;
pub mod util;
use util::{lat_lon, node_bounds};
#[derive(Clone)]
pub struct GeoGrid {
bounds: Bounds,
res_lat: f32,
res_lon: f32,
grid_height: usize,
grid_width: usize,
grid: Vec<u8>,
}
#[inline]
fn mark_point(buf: &mut [u8], row: f32, col: f32, width: usize) {
let buf_offset = row.round() as usize * width + col.round() as usize;
buf[buf_offset] = 1;
}
impl GeoGrid {
pub fn from_roads<NMatrix: AsRef<[NRow]>+Sync, NRow: AsRef<[Node]>+Sync>
(roads: NMatrix, resolution: (usize, usize), scale: bool) -> GeoGrid {
let roads = roads.as_ref();
let bounds = node_bounds(roads.iter().flat_map(|r| r.as_ref().iter()));
let (lat_len, lon_len) = lat_lon((bounds.south + bounds.north) / 2.0);
let real_height = lat_len * bounds.range_lat();
let real_width = lon_len * bounds.range_lon();
let (expected_height, expected_width) = resolution;
let mut res_lat = real_height / expected_height as f32;
let mut res_lon = real_width / expected_width as f32;
if scale {
res_lat = f32::max(res_lat, res_lon);
res_lon = res_lat;
}
let grid_height = (real_height / res_lat).round() as usize;
let grid_width = (real_width / res_lon).round() as usize;
let mut grid = vec![0; grid_height*grid_width];
for r in roads {
let r = r.as_ref();
for (a, b) in r.iter().zip(r.iter().skip(1)) {
let a_row = (bounds.north - a.lat) / bounds.range_lat() *
((grid_height - 1) as f32);
let a_col = (a.lon - bounds.west) / bounds.range_lon() * ((grid_width - 1) as f32);
let b_row = (bounds.north - b.lat) / bounds.range_lat() *
((grid_height - 1) as f32);
let b_col = (b.lon - bounds.west) / bounds.range_lon() * ((grid_width - 1) as f32);
let max_abs_diff = f32::max((b_row - a_row).abs(), (b_col - a_col).abs());
if max_abs_diff == 0.0 {
mark_point(&mut grid, a_row, a_col, grid_width);
continue;
}
let lat_step = (b_row - a_row) / max_abs_diff;
let lon_step = (b_col - a_col) / max_abs_diff;
let mut step_row = a_row;
let mut step_col = a_col;
while (step_row > b_row) == (a_row > b_row) &&
(step_col > b_col) == (a_col > b_col) {
mark_point(&mut grid, step_row, step_col, grid_width);
step_row += lat_step;
step_col += lon_step;
}
}
if !r.is_empty() {
let last = r[r.len() - 1];
let l_row = (bounds.north - last.lat) / bounds.range_lat() *
((grid_height - 1) as f32);
let l_col = (last.lon - bounds.west) / bounds.range_lon() *
((grid_width - 1) as f32);
mark_point(&mut grid, l_row, l_col, grid_width);
}
}
GeoGrid {
bounds: bounds,
res_lat: res_lat,
res_lon: res_lon,
grid_height: grid_height,
grid_width: grid_width,
grid: grid,
}
}
pub fn from_nodes(nodes: &[Node], resolution: (f32, f32)) -> GeoGrid {
let (res_lat, res_lon) = resolution;
let bounds = node_bounds(nodes.iter());
let (lat_len, lon_len) = lat_lon((bounds.south + bounds.north) / 2.0);
let real_height = lat_len * bounds.range_lat();
let real_width = lon_len * bounds.range_lon();
let grid_height = (real_height / res_lat).round() as usize;
let grid_width = (real_width / res_lon).round() as usize;
let mut grid = vec![0; grid_height*grid_width];
for n in nodes {
let grid_lat = (bounds.north - n.lat) / bounds.range_lat() * ((grid_height - 1) as f32);
let grid_lon = (n.lon - bounds.west) / bounds.range_lon() * ((grid_width - 1) as f32);
grid[(grid_lat.round() as usize) * grid_width + (grid_lon.round() as usize)] = 1;
}
GeoGrid {
bounds: bounds,
res_lat: res_lat,
res_lon: res_lon,
grid_height: grid_height,
grid_width: grid_width,
grid: grid,
}
}
pub fn resolution(&self) -> (f32, f32) {
(self.res_lat, self.res_lon)
}
pub fn degree_resolution(&self) -> (f32, f32) {
((self.bounds.north - self.bounds.south) / self.grid_height as f32,
(self.bounds.east - self.bounds.west) / self.grid_width as f32)
}
pub fn bbox(&self) -> Bounds {
self.bounds
}
pub fn size(&self) -> (usize, usize) {
(self.grid_height, self.grid_width)
}
pub fn len(&self) -> usize {
self.grid.len()
}
pub fn is_empty(&self) -> bool {
self.grid.is_empty()
}
pub fn clear_grid(&mut self) {
self.grid.clear();
self.grid.shrink_to_fit();
}
pub fn real_size(&self) -> (f32, f32) {
(self.res_lat * self.grid_height as f32, self.res_lon * self.grid_width as f32)
}
pub fn grid(&self) -> &[u8] {
&self.grid[..]
}
pub fn grid_mut(&mut self) -> &mut [u8] {
&mut self.grid[..]
}
pub fn trace_shape<BMatrix: AsRef<[BRow]>, BRow: AsRef<[bool]>>(&self,
shape: BMatrix,
topleft: usize)
-> Vec<usize> {
shape.as_ref()
.iter()
.enumerate()
.flat_map(|(x, r)| {
r.as_ref()
.iter()
.enumerate()
.map(move |(y, v)| (x, y, v))
})
.filter(|&(_, _, v)| *v)
.map(|(x, y, _)| topleft + x * self.grid_width + y)
.collect()
}
pub fn to_lat_lon(&self, idx: usize) -> (f32, f32) {
let (lat_len, lon_len) = lat_lon((self.bounds.south + self.bounds.north) / 2.0);
let row = (idx / self.grid_width) as f32;
let col = (idx % self.grid_width) as f32;
(self.bounds.north - row * self.res_lat / lat_len,
self.bounds.west + col * self.res_lon / lon_len)
}
pub fn near_lat_lon(&self, lat: f32, lon: f32) -> usize {
let (ra, ri) = self.degree_resolution();
let lat_offset = ((self.bounds.north - lat) / ra).round() as usize;
let lon_offset = ((lon - self.bounds.west) / ri).round() as usize;
lat_offset * self.grid_width + lon_offset
}
pub fn bounded_subgrid(&self,
north: f32,
south: f32,
east: f32,
west: f32)
-> (usize, (usize, usize)) {
let (ra, ri) = self.degree_resolution();
let lat_start = ((self.bounds.north - north) / ra).round() as usize;
let lon_start = ((west - self.bounds.west) / ri).round() as usize;
let start = lat_start * self.grid_width + lon_start;
let lat_end = ((self.bounds.north - south) / ra).round() as usize;
let lon_end = ((east - self.bounds.west) / ri).round() as usize;
(start, (lat_end - lat_start, lon_end - lon_start))
}
pub fn l1dist_transform(&self) -> Vec<i32> {
util::l1dist_transform(&self.grid, self.size())
}
}