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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
use anyhow::Result;
use image::{Rgba, RgbaImage};
use crate::{
draw_line_dashed, draw_line_solid_thick, DrawContext, Drawable, Obb, ObbStyle, ObbStyleMode,
};
impl Drawable for [Obb] {
fn draw(&self, ctx: &DrawContext, canvas: &mut RgbaImage) -> Result<()> {
self.iter().try_for_each(|x| x.draw(ctx, canvas))
}
}
impl Drawable for Obb {
fn draw(&self, ctx: &DrawContext, canvas: &mut RgbaImage) -> Result<()> {
let default_style = ObbStyle::default();
let style = self.style().or(ctx.obb_style).unwrap_or(&default_style);
if !style.visible() {
return Ok(());
}
let colors = ctx.resolve_obb_colors(style, self.id());
// Draw outline
if style.draw_outline() {
let color = Rgba(colors.outline.into());
let mode = *style.mode();
let vertices = self.vertices();
let thickness = style.thickness();
match mode {
ObbStyleMode::Solid => {
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
draw_line_solid_thick(
canvas,
(p1[0], p1[1]),
(p2[0], p2[1]),
color,
thickness,
);
}
}
ObbStyleMode::Dashed { length, gap } => {
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
draw_line_dashed(
canvas,
(p1[0], p1[1]),
(p2[0], p2[1]),
color,
length,
gap,
thickness,
);
}
}
ObbStyleMode::Corners {
ratio_long,
ratio_short,
} => {
// Calculate edge lengths
let mut edge_lengths = Vec::with_capacity(4);
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
let dx = p2[0] - p1[0];
let dy = p2[1] - p1[1];
edge_lengths.push((dx * dx + dy * dy).sqrt());
}
// Determine which edges are long/short
let avg_len =
(edge_lengths[0] + edge_lengths[1] + edge_lengths[2] + edge_lengths[3])
/ 4.0;
// Draw corner brackets for each vertex
for i in 0..vertices.len() {
let p_curr = vertices[i];
let p_next = vertices[(i + 1) % vertices.len()];
let p_prev = vertices[(i + vertices.len() - 1) % vertices.len()];
// Edge to next vertex
let edge_len_next = edge_lengths[i];
let ratio_next = if edge_len_next > avg_len {
ratio_long
} else {
ratio_short
};
let corner_len_next = (edge_len_next * ratio_next).max(1.0);
let dx_next = p_next[0] - p_curr[0];
let dy_next = p_next[1] - p_curr[1];
let t_next = corner_len_next / edge_len_next;
let end_next = [p_curr[0] + dx_next * t_next, p_curr[1] + dy_next * t_next];
draw_line_solid_thick(
canvas,
(p_curr[0], p_curr[1]),
(end_next[0], end_next[1]),
color,
thickness,
);
// Edge to previous vertex
let edge_len_prev = edge_lengths[(i + vertices.len() - 1) % vertices.len()];
let ratio_prev = if edge_len_prev > avg_len {
ratio_long
} else {
ratio_short
};
let corner_len_prev = (edge_len_prev * ratio_prev).max(1.0);
let dx_prev = p_prev[0] - p_curr[0];
let dy_prev = p_prev[1] - p_curr[1];
let t_prev = corner_len_prev / edge_len_prev;
let end_prev = [p_curr[0] + dx_prev * t_prev, p_curr[1] + dy_prev * t_prev];
draw_line_solid_thick(
canvas,
(p_curr[0], p_curr[1]),
(end_prev[0], end_prev[1]),
color,
thickness,
);
}
}
ObbStyleMode::Rounded { ratio } => {
// Calculate edge lengths and determine radius
let mut edge_lengths = Vec::with_capacity(4);
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
let dx = p2[0] - p1[0];
let dy = p2[1] - p1[1];
edge_lengths.push((dx * dx + dy * dy).sqrt());
}
let min_edge = edge_lengths.iter().cloned().fold(f32::MAX, f32::min);
let radius = (min_edge * ratio).max(1.0);
// Calculate unit vectors for each edge (from vertex i to vertex i+1)
let mut unit_vecs: Vec<[f32; 2]> = Vec::with_capacity(4);
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
let len = edge_lengths[i];
unit_vecs.push([(p2[0] - p1[0]) / len, (p2[1] - p1[1]) / len]);
}
// Draw shortened edges (leave room for arcs at corners)
for i in 0..vertices.len() {
let p1 = vertices[i];
let p2 = vertices[(i + 1) % vertices.len()];
let uv = unit_vecs[i];
let start = [p1[0] + uv[0] * radius, p1[1] + uv[1] * radius];
let end = [p2[0] - uv[0] * radius, p2[1] - uv[1] * radius];
draw_line_solid_thick(
canvas,
(start[0], start[1]),
(end[0], end[1]),
color,
thickness,
);
}
// Draw corner arcs (OBB corners are ~90 degrees)
for i in 0..vertices.len() {
let p_curr = vertices[i];
let prev_edge_idx = (i + vertices.len() - 1) % vertices.len();
// Direction vectors
let uv_in = unit_vecs[prev_edge_idx]; // incoming edge direction
let uv_out = unit_vecs[i]; // outgoing edge direction
// Arc endpoints on the original edge lines
let arc_start =
[p_curr[0] - uv_in[0] * radius, p_curr[1] - uv_in[1] * radius];
let arc_end = [
p_curr[0] + uv_out[0] * radius,
p_curr[1] + uv_out[1] * radius,
];
// For 90-degree corners, the center is at arc_start + perpendicular * radius
// Check winding direction to determine which perpendicular to use
let cross = uv_in[0] * uv_out[1] - uv_in[1] * uv_out[0];
let perp_in = if cross > 0.0 {
[-uv_in[1], uv_in[0]]
} else {
[uv_in[1], -uv_in[0]]
};
let center = [
arc_start[0] + perp_in[0] * radius,
arc_start[1] + perp_in[1] * radius,
];
// Calculate angles from center
let start_angle =
(arc_start[1] - center[1]).atan2(arc_start[0] - center[0]);
let end_angle = (arc_end[1] - center[1]).atan2(arc_end[0] - center[0]);
// Normalize angle difference
let mut angle_diff = end_angle - start_angle;
if cross > 0.0 {
// Counter-clockwise
if angle_diff < 0.0 {
angle_diff += 2.0 * std::f32::consts::PI;
}
} else {
// Clockwise
if angle_diff > 0.0 {
angle_diff -= 2.0 * std::f32::consts::PI;
}
}
let steps = (radius.abs() as i32).max(12);
for step in 0..steps {
let t1 = step as f32 / steps as f32;
let t2 = (step + 1) as f32 / steps as f32;
let angle1 = start_angle + angle_diff * t1;
let angle2 = start_angle + angle_diff * t2;
let x1 = center[0] + radius * angle1.cos();
let y1 = center[1] + radius * angle1.sin();
let x2 = center[0] + radius * angle2.cos();
let y2 = center[1] + radius * angle2.sin();
draw_line_solid_thick(canvas, (x1, y1), (x2, y2), color, thickness);
}
}
}
}
}
// Draw fill
if style.draw_fill() {
let mut overlay = canvas.clone();
let polygon = self.to_polygon();
let exterior = polygon.exterior();
let n = if polygon.is_closed() {
polygon.count() - 1
} else {
polygon.count()
};
let polygon_i32 = exterior
.iter()
.take(n)
.map(|p| imageproc::point::Point::new(p[0] as i32, p[1] as i32))
.collect::<Vec<_>>();
imageproc::drawing::draw_polygon_mut(
&mut overlay,
&polygon_i32,
Rgba(colors.fill.into()),
);
image::imageops::overlay(canvas, &overlay, 0, 0);
}
// Draw text
let text_style = style.text_style();
if style.text_visible() && text_style.should_draw() {
let label = self.meta().label(
text_style.id(),
text_style.name(),
text_style.confidence(),
text_style.decimal_places(),
);
let text_mode = *text_style.mode();
let text_thickness = text_style.thickness();
let top = self.top();
let bottom = self.bottom();
let left = self.left();
let right = self.right();
let bbox = (left[0], top[1], right[0], bottom[1]);
let font_size = text_style.font_size();
let box_size = ctx
.text_renderer
.box_size_with(&label, &text_mode, font_size)?;
let canvas_size = (canvas.width(), canvas.height());
let text_offset = if matches!(
*text_style.loc(),
crate::TextLoc::OuterTopLeft
| crate::TextLoc::OuterTopCenter
| crate::TextLoc::OuterTopRight
) {
let obb_t = style.thickness();
let obb_offset = if obb_t > 0 { obb_t - 1 } else { 0 };
Some((obb_offset + text_thickness) as f32)
} else {
None
};
let (x, y) =
text_style
.loc()
.compute_anchor(bbox, box_size, canvas_size, None, text_offset);
ctx.text_renderer.render_styled_with(
canvas,
&label,
x,
y,
colors.text,
colors.text_bg_fill,
colors.text_bg_outline,
text_mode,
text_style.draw_fill(),
text_style.draw_outline(),
text_thickness,
font_size,
)?;
}
Ok(())
}
}