From c771f8698e1b066a51f1c4aa5e4d4be68a4b6e16 Mon Sep 17 00:00:00 2001
From: Ondrej Novak <git@npost.cz>
Date: Sun, 10 May 2026 22:08:32 +0200
Subject: [PATCH] wip: drawing

---
 Cargo.lock                  | 1413 +++++++++++++++++++++++++++++++++++
 Cargo.toml                  |    2 +-
 draw/Cargo.toml             |    7 +
 draw/src/lib.rs             |    3 +
 draw/src/stacked.rs         |   99 +++
 waybar-collectd/Cargo.toml  |    2 +
 waybar-collectd/src/main.rs |   38 +-
 7 files changed, 1558 insertions(+), 6 deletions(-)
 create mode 100644 draw/Cargo.toml
 create mode 100644 draw/src/lib.rs
 create mode 100644 draw/src/stacked.rs

diff --git a/Cargo.lock b/Cargo.lock
index 2ee57ff..a16482d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
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+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
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+ "syn",
+ "wasm-bindgen-shared",
+]
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+[[package]]
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+ "unicode-ident",
+]
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 [[package]]
 name = "waybar-collectd"
 version = "0.1.0"
 dependencies = [
+ "draw",
+ "imageproc",
  "protocol",
 ]
+
+[[package]]
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+ "safe_arch",
+]
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+ "zerocopy-derive",
+]
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+
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+dependencies = [
+ "simd-adler32",
+]
+
+[[package]]
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+ "zune-core",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 9c1303c..d2968fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,4 +1,4 @@
 [workspace]
 resolver = "3"
-members = ["protocol", "waybar-collectd"]
+members = ["draw", "protocol", "waybar-collectd"]
 
diff --git a/draw/Cargo.toml b/draw/Cargo.toml
new file mode 100644
index 0000000..8e25c1d
--- /dev/null
+++ b/draw/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "draw"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+imageproc = { version = "0.26.1", features = ["display-window"] }
diff --git a/draw/src/lib.rs b/draw/src/lib.rs
new file mode 100644
index 0000000..17156dc
--- /dev/null
+++ b/draw/src/lib.rs
@@ -0,0 +1,3 @@
+mod stacked;
+
+pub use stacked::{StackedConfig, StackedSeries, StackedSeriesConfig, stacked};
diff --git a/draw/src/stacked.rs b/draw/src/stacked.rs
new file mode 100644
index 0000000..aa55412
--- /dev/null
+++ b/draw/src/stacked.rs
@@ -0,0 +1,99 @@
+use imageproc::{
+    drawing::draw_filled_rect_mut,
+    image::{Rgb, RgbImage},
+    rect::Rect,
+};
+
+pub struct StackedConfig {
+    pub width_px_per_sample: u32,
+    pub height_px: u32,
+    pub series: Vec<StackedSeriesConfig>,
+    pub max_samples: u32,
+}
+
+pub struct StackedSeriesConfig {
+    pub color: (u8, u8, u8),
+}
+
+pub struct StackedSeries<'a> {
+    pub config: &'a StackedConfig,
+    pub data: Vec<&'a Vec<f32>>,
+}
+
+pub fn stacked(graph: StackedSeries) -> RgbImage {
+    let mut image = RgbImage::new(
+        graph.config.width_px_per_sample * graph.config.max_samples,
+        graph.config.height_px as u32,
+    );
+    draw_scaled_graph(&mut image, &graph);
+
+    image
+}
+
+/// return scale factor to scale stacked series sum to range 0..1
+fn get_scale(series: &Vec<&Vec<f32>>) -> f32 {
+    let len = series.iter().map(|s| s.len()).max().unwrap_or(0);
+
+    let max = (0..len)
+        .map(|i| series.iter().map(|s| s[i]).sum::<f32>())
+        .max_by(|f1, f2| f1.total_cmp(f2))
+        .unwrap_or(1f32);
+
+    1f32 / max
+}
+
+fn draw_scaled_graph(image: &mut RgbImage, graph: &StackedSeries) {
+    let scale = get_scale(&graph.data);
+    let colors = graph
+        .config
+        .series
+        .iter()
+        .map(|s| Rgb([s.color.0, s.color.1, s.color.2]))
+        .collect::<Vec<Rgb<u8>>>();
+
+    let mut x_offset = 0f32;
+    let mut series_idx = 0usize;
+
+    let rows = graph.data.len();
+    let cols = graph.data[0].len();
+    let transposed_series: Vec<Vec<f32>> = (0..cols)
+        .map(|col| (0..rows).map(|row| graph.data[row][col]).collect())
+        .collect();
+
+    for timeseries in transposed_series {
+        let mut y_offset = graph.config.height_px as f32;
+
+        for sample in timeseries.iter() {
+            println!("VAL {}", sample);
+            let color = colors[series_idx];
+            let height_px = (graph.config.height_px as f32) * sample * scale;
+            let rect = Rect::at(x_offset as i32, (y_offset - height_px) as i32)
+                .of_size(graph.config.width_px_per_sample, height_px as u32);
+            draw_filled_rect_mut(image, rect, color);
+            x_offset += graph.config.width_px_per_sample as f32;
+            y_offset -= height_px;
+            println!("rect: {:?}, height {}, yoff {}", rect, height_px, y_offset);
+        }
+
+        println!("BRK");
+
+        // FIXME:
+        // series_idx += 1;
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_get_scale() {
+        let conf = vec![
+            vec![1., 2., 3., 4., 5.],
+            vec![0., 1., 0., 0., 0.],
+            vec![0., 0., 0., 0., 5.],
+        ];
+        assert_eq!(0, 1); // FIX 
+        // assert_eq!(get_scale(&conf), 0.1);
+    }
+}
diff --git a/waybar-collectd/Cargo.toml b/waybar-collectd/Cargo.toml
index 447620d..99a4f68 100644
--- a/waybar-collectd/Cargo.toml
+++ b/waybar-collectd/Cargo.toml
@@ -4,4 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+draw = { version = "0.1.0", path = "../draw" }
+imageproc = { version = "0.26.1", features = ["display-window"] }
 protocol = { path = "../protocol" }
diff --git a/waybar-collectd/src/main.rs b/waybar-collectd/src/main.rs
index 30605ae..fa131b0 100644
--- a/waybar-collectd/src/main.rs
+++ b/waybar-collectd/src/main.rs
@@ -1,12 +1,40 @@
+use draw::{StackedConfig, StackedSeries, StackedSeriesConfig, stacked};
+use imageproc::window::display_image;
 use protocol::Protocol;
 
 fn main() {
+    let cfg = StackedConfig {
+        width_px_per_sample: 4,
+        height_px: 100,
+        series: vec![StackedSeriesConfig { color: (255, 0, 0) }],
+        max_samples: 10,
+    };
+
     if let Ok(mut proto) = Protocol::new("/var/run/collectd-unixsock") {
-        let rec = proto.get("tp-on/cpu-0/cpu-idle".to_string(), "value".to_string());
-        if let Ok(val) = rec {
-            println!("Got {}", val);
-        } else {
-            println!("{}", rec.unwrap_err());
+        let mut data: Vec<f32> = vec![];
+        // loop {
+        for _ in 1..10 {
+            let rec = proto.get(
+                "beerpowered/cpu-0/cpu-idle".to_string(),
+                "value".to_string(),
+            );
+            if let Ok(val) = rec {
+                data.push(val);
+            } else {
+                println!("{}", rec.unwrap_err());
+            }
+
+            if data.len() > 10 {
+                data.pop();
+            }
+
+            let img = stacked(StackedSeries {
+                config: &cfg,
+                data: vec![&data],
+            });
+            display_image("bzn", &img, 500, 500);
         }
+    } else {
+        panic!("sock not found!");
     }
 }