tf2_rs 0.1.0

ROS 2 TF2 bindings for Rust using cxx and rclrs
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

use crate::Tf2Error;
use crate::TransformStamped;
use crate::ffi::ffi;
use crate::ffi_utils::call_out;
use crate::transform::Transformable;
use ros_env::sensor_msgs;

crate::impl_has_header_for_ros2_msg!(sensor_msgs::msg::PointCloud2);

impl Transformable for sensor_msgs::msg::PointCloud2 {
    fn apply_transform(&self, tf: &TransformStamped) -> Result<Self, Tf2Error> {
        let ffi_in: ffi::Tf2PointCloud2 = self.into();
        let ffi_out = call_out(|out| ffi::do_transform_pointcloud2(&ffi_in, &tf.to_ffi(), out))?;
        Ok((ffi_out).into())
    }
}

impl From<&sensor_msgs::msg::PointCloud2> for ffi::Tf2PointCloud2 {
    fn from(pc: &sensor_msgs::msg::PointCloud2) -> Self {
        ffi::Tf2PointCloud2 {
            header: ffi::Tf2Header {
                stamp: ffi::Tf2Time {
                    sec: pc.header.stamp.sec,
                    nanosec: pc.header.stamp.nanosec,
                },
                frame_id: pc.header.frame_id.clone(),
            },
            height: pc.height,
            width: pc.width,
            fields: pc
                .fields
                .iter()
                .map(|f| ffi::Tf2PointField {
                    name: f.name.clone(),
                    offset: f.offset,
                    datatype: f.datatype,
                    count: f.count,
                })
                .collect(),
            is_bigendian: pc.is_bigendian,
            point_step: pc.point_step,
            row_step: pc.row_step,
            data: pc.data.clone(),
            is_dense: pc.is_dense,
        }
    }
}

impl From<ffi::Tf2PointCloud2> for sensor_msgs::msg::PointCloud2 {
    fn from(pc: ffi::Tf2PointCloud2) -> Self {
        let mut out = sensor_msgs::msg::PointCloud2::default();
        out.header.stamp.sec = pc.header.stamp.sec;
        out.header.stamp.nanosec = pc.header.stamp.nanosec;
        out.header.frame_id = pc.header.frame_id;

        out.height = pc.height;
        out.width = pc.width;
        out.fields = pc
            .fields
            .into_iter()
            .map(|f| sensor_msgs::msg::PointField {
                name: f.name,
                offset: f.offset,
                datatype: f.datatype,
                count: f.count,
            })
            .collect();

        out.is_bigendian = pc.is_bigendian;
        out.point_step = pc.point_step;
        out.row_step = pc.row_step;
        out.data = pc.data;
        out.is_dense = pc.is_dense;
        out
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::ffi::ffi;

    // ROS PointField datatype enum: FLOAT32 == 7.
    const PF_FLOAT32: u8 = 7;

    fn make_tf(
        parent_frame: &str, // target frame (tf header.frame_id)
        child_frame: &str,  // source frame (tf child_frame_id)
        translation: [f64; 3],
        rotation_xyzw: [f64; 4],
        stamp: (i32, u32),
    ) -> crate::TransformStamped {
        let raw = ffi::Tf2TransformStamped {
            stamp: ffi::Tf2Time {
                sec: stamp.0,
                nanosec: stamp.1,
            },
            parent_frame: parent_frame.to_string(),
            child_frame: child_frame.to_string(),

            translation_x: translation[0],
            translation_y: translation[1],
            translation_z: translation[2],

            rotation_x: rotation_xyzw[0],
            rotation_y: rotation_xyzw[1],
            rotation_z: rotation_xyzw[2],
            rotation_w: rotation_xyzw[3],
        };

        crate::TransformStamped::from_ffi(raw)
    }

    fn make_xyz_cloud(frame: &str, points: &[[f32; 3]]) -> sensor_msgs::msg::PointCloud2 {
        let mut cloud = sensor_msgs::msg::PointCloud2::default();

        cloud.header.frame_id = frame.to_string();
        cloud.header.stamp.sec = 0;
        cloud.header.stamp.nanosec = 0;

        cloud.height = 1;
        cloud.width = points.len() as u32;
        cloud.is_bigendian = false;
        cloud.is_dense = true;

        let x = sensor_msgs::msg::PointField {
            name: "x".to_string(),
            offset: 0,
            datatype: PF_FLOAT32,
            count: 1,
        };

        let y = sensor_msgs::msg::PointField {
            name: "y".to_string(),
            offset: 4,
            datatype: PF_FLOAT32,
            count: 1,
        };

        let z = sensor_msgs::msg::PointField {
            name: "z".to_string(),
            offset: 8,
            datatype: PF_FLOAT32,
            count: 1,
        };

        cloud.fields = vec![x, y, z];

        cloud.point_step = 12;
        cloud.row_step = cloud.point_step * cloud.width;

        cloud.data = Vec::with_capacity(cloud.row_step as usize);
        for p in points {
            cloud.data.extend_from_slice(&p[0].to_le_bytes());
            cloud.data.extend_from_slice(&p[1].to_le_bytes());
            cloud.data.extend_from_slice(&p[2].to_le_bytes());
        }

        cloud
    }

    fn read_xyz_cloud(cloud: &sensor_msgs::msg::PointCloud2) -> Vec<[f32; 3]> {
        assert_eq!(cloud.point_step, 12, "test helper assumes point_step=12");
        cloud
            .data
            .chunks_exact(12)
            .map(|c| {
                let x = f32::from_le_bytes(c[0..4].try_into().unwrap());
                let y = f32::from_le_bytes(c[4..8].try_into().unwrap());
                let z = f32::from_le_bytes(c[8..12].try_into().unwrap());
                [x, y, z]
            })
            .collect()
    }

    fn assert_near(a: f32, b: f32, eps: f32, label: &str) {
        if (a - b).abs() > eps {
            panic!("{label}: {a} vs {b} (eps={eps})");
        }
    }

    #[test]
    fn transform_pointcloud2_translation_only() {
        // Transform from "lidar" (source) into "map" (target)
        let tf = make_tf(
            "map",
            "lidar",
            [10.0, -2.0, 0.5],
            [0.0, 0.0, 0.0, 1.0], // identity quaternion
            (123, 456),
        );

        let cloud_in = make_xyz_cloud("lidar", &[[1.0, 2.0, 3.0]]);
        let cloud_out = cloud_in
            .apply_transform(&tf)
            .expect("transform should succeed");

        // tf2_sensor_msgs does: p_out = p_in; p_out.header = t_in.header;
        // So output header should match the transform header. :contentReference[oaicite:2]{index=2}
        assert_eq!(cloud_out.header.frame_id, "map");
        assert_eq!(cloud_out.header.stamp.sec, 123);
        assert_eq!(cloud_out.header.stamp.nanosec, 456);

        let pts = read_xyz_cloud(&cloud_out);
        assert_eq!(pts.len(), 1);
        assert_near(pts[0][0], 11.0, 1e-5, "x");
        assert_near(pts[0][1], 0.0, 1e-5, "y");
        assert_near(pts[0][2], 3.5, 1e-5, "z");
    }

    #[test]
    fn transform_pointcloud2_rotate_z_90deg() {
        // 90 deg yaw about +Z: q = [0,0,sin(pi/4),cos(pi/4)]
        let s = (0.5f64).sqrt();
        let tf = make_tf("map", "lidar", [0.0, 0.0, 0.0], [0.0, 0.0, s, s], (0, 0));

        let cloud_in = make_xyz_cloud("lidar", &[[1.0, 0.0, 0.0]]);
        let cloud_out = cloud_in
            .apply_transform(&tf)
            .expect("transform should succeed");

        let pts = read_xyz_cloud(&cloud_out);
        assert_eq!(pts.len(), 1);

        // (1,0,0) rotated +90deg about Z -> (0,1,0)
        assert_near(pts[0][0], 0.0, 1e-5, "x");
        assert_near(pts[0][1], 1.0, 1e-5, "y");
        assert_near(pts[0][2], 0.0, 1e-5, "z");
    }

    #[test]
    fn transform_pointcloud2_missing_xyz_fields_returns_err() {
        let tf = make_tf(
            "map",
            "lidar",
            [0.0, 0.0, 0.0],
            [0.0, 0.0, 0.0, 1.0],
            (0, 0),
        );

        // Malformed cloud: no fields at all, but has 12 bytes of data.
        let mut cloud = sensor_msgs::msg::PointCloud2::default();
        cloud.header.frame_id = "lidar".to_string();
        cloud.height = 1;
        cloud.width = 1;
        cloud.point_step = 12;
        cloud.row_step = 12;
        cloud.is_bigendian = false;
        cloud.is_dense = true;
        cloud.data = vec![0u8; 12];

        let res = cloud.apply_transform(&tf);
        assert!(
            matches!(
                res,
                Err(crate::Tf2Error::InvalidArgument(_)) | Err(crate::Tf2Error::Other(_))
            ),
            "expected an error for malformed PointCloud2, got: {res:?}"
        );
    }
}