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
//! Live profile toolbar example.
//!
//! Mirrors `silx/examples/plotProfile.py`: a 2D image plot with the compact
//! profile-mode toolbar (None / Horizontal / Vertical / Line / Rectangle).
//! While Horizontal or Vertical is active and the cursor hovers over the image,
//! the corresponding row or column profile is extracted from the pixel data and
//! drawn live in a companion Plot1D below. (The shared toolbar also shows Line
//! and Rectangle, but only the row/column modes are wired in this example.)
//!
//! A yellow crosshair marker stays on the image at the last profiled pixel —
//! unlike the hover crosshair, it survives the pointer leaving the image (silx
//! keeps the profile ROI drawn on the image the same way). The profile plot has
//! its own toolbar; its auto-scale X/Y toggles control which axes follow the
//! live profile data (reset-zoom-on-data is per-axis-flag aware).
//!
//! Run with: `cargo run --example high_level_live_profile`
use eframe::egui;
use siplot::{Colormap, CurveData, ItemHandle, Plot1D, Plot2D, ProfileMode, YAxis};
const WIDTH: u32 = 128;
const HEIGHT: u32 = 96;
struct LiveProfileApp {
image_plot: Plot2D,
profile_plot: Plot1D,
pixels: Vec<f32>,
profile_handle: ItemHandle,
/// Persistent crosshair on the image at the last profiled pixel
/// `(vertical x-marker, horizontal y-marker)`, created on the first
/// profile extraction.
cross_markers: Option<(ItemHandle, ItemHandle)>,
}
impl LiveProfileApp {
fn new(cc: &eframe::CreationContext<'_>) -> Self {
let rs = cc
.wgpu_render_state
.as_ref()
.expect("eframe must use the wgpu renderer");
let pixels = build_image();
let mut image_plot = Plot2D::new(rs, 0);
image_plot.set_graph_title("Image (hover for live profile)");
image_plot.set_graph_cursor(true);
image_plot.set_default_colormap(Colormap::viridis(0.0, 1.0));
image_plot
.try_add_default_image(WIDTH, HEIGHT, &pixels)
.expect("image dimensions match");
let mut profile_plot = Plot1D::new(rs, 1);
profile_plot.set_graph_title("Profile");
// Pre-insert an empty curve that will be updated in the frame loop.
let init_y: Vec<f64> = vec![0.0; WIDTH as usize];
let init_x: Vec<f64> = (0..WIDTH as usize).map(|i| i as f64).collect();
let profile_handle =
profile_plot.add_curve_with_legend(&init_x, &init_y, egui::Color32::YELLOW, "profile");
Self {
image_plot,
profile_plot,
pixels,
profile_handle,
cross_markers: None,
}
}
/// Place (or move) the persistent crosshair markers at the profiled
/// pixel's center.
fn update_cross_markers(&mut self, cx: f64, cy: f64) {
match self.cross_markers {
Some((vx, hy)) => {
self.image_plot.set_marker_position(vx, cx, cy);
self.image_plot.set_marker_position(hy, cx, cy);
}
None => {
let vx = self.image_plot.add_x_marker(cx, egui::Color32::YELLOW);
let hy = self
.image_plot
.add_y_marker(cy, egui::Color32::YELLOW, YAxis::Left);
self.cross_markers = Some((vx, hy));
}
}
}
}
impl eframe::App for LiveProfileApp {
fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
let half_h = ui.available_size() * egui::vec2(1.0, 0.5);
// Top half: image + profile toolbar.
let (plot_resp, mode) = ui
.allocate_ui(half_h, |ui| {
let (_, mode) = self.image_plot.show_toolbar_with(ui, |ui, plot| {
ui.separator();
plot.show_profile_toolbar(ui)
});
let resp = self.image_plot.show(ui);
(resp, mode)
})
.inner;
// Update profile curve from hover position when a mode is active.
if let Some((x, y)) =
self.image_plot
.profile_at_cursor(&plot_resp, &self.pixels, WIDTH, HEIGHT, mode)
{
let curve = CurveData::new(x, y, egui::Color32::YELLOW);
// profile_plot is a Plot1D, which DerefMuts to PlotWidget.
self.profile_plot
.update_curve_data(self.profile_handle, &curve);
// Mark the profiled pixel on the image with a persistent crosshair
// (the hover crosshair vanishes when the pointer leaves; silx keeps
// the profile ROI drawn on the image). Same cursor→pixel mapping as
// `profile_at_cursor` (floor to the pixel, marker at its center).
if let Some(p) = plot_resp.response.hover_pos() {
let (dx, dy) = plot_resp.transform.pixel_to_data(p);
self.update_cross_markers(dx.floor() + 0.5, dy.floor() + 0.5);
}
// Relabel X axis to reflect current mode.
let label = match mode {
ProfileMode::Horizontal => "column",
ProfileMode::Vertical => "row",
ProfileMode::None | ProfileMode::Line | ProfileMode::Rectangle => "index",
};
self.profile_plot.set_graph_x_label(label);
}
// Bottom half: profile plot with its own toolbar. The auto-scale X/Y
// toggle buttons gate which axes refit when the profile data updates.
ui.allocate_ui(half_h, |ui| {
self.profile_plot.show_toolbar(ui);
self.profile_plot.show(ui);
});
// Neither plot's event queue is consumed by this example; drain so the
// per-frame marker moves and curve updates do not accumulate.
self.image_plot.drain_events();
self.profile_plot.drain_events();
}
}
fn build_image() -> Vec<f32> {
let mut pixels = Vec::with_capacity((WIDTH * HEIGHT) as usize);
for row in 0..HEIGHT {
for col in 0..WIDTH {
let cx = (col as f32 - WIDTH as f32 / 2.0) / (WIDTH as f32 / 4.0);
let cy = (row as f32 - HEIGHT as f32 / 2.0) / (HEIGHT as f32 / 4.0);
pixels.push((-0.5 * (cx * cx + cy * cy)).exp());
}
}
pixels
}
fn main() -> eframe::Result {
eframe::run_native(
"siplot: live profile toolbar",
eframe::NativeOptions {
renderer: eframe::Renderer::Wgpu,
..Default::default()
},
Box::new(|cc| Ok(Box::new(LiveProfileApp::new(cc)) as Box<dyn eframe::App>)),
)
}