add sequential bounding for chroma curves

.gitignore

@@ -23,3 +23,4 @@ archive/
 notebooks/color_spaces_manyview.ipynb
 notebooks/oklch_srgb_spherical.ipynb
 notebooks/v1.4.0/
+notebooks/v1.5.1/

README.md

@@ -32,7 +32,7 @@ smoothly as a function of lightness within sRGB gamut bounds.
 
 | Chroma curves                                         | Color trajectories                       |
 |-------------------------------------------------------|------------------------------------------|
-| ![Chroma curves](images/curves/cstar-curves-v140.png) | ![Trajectories](images/trajectories.gif) |
+| ![Chroma curves](images/curves/cstar-curves-v151.png) | ![Trajectories](images/trajectories.gif) |
 
 | Palette                        |
 |--------------------------------|
@@ -144,7 +144,7 @@ the `monobiome` CLI:
   template.
 
 Running these commands in sequence from the repo root should work
-out-of-the-box, after having installed the CLI tool.
+out-of-the-box after having installed the CLI tool.
 
 ## Applications
 This repo provides palette-agnostic theme templates for `kitty`,

monobiome/constants.py

@@ -121,3 +121,21 @@ for h_str, L_points_C in Lpoints_Cqbr_Hmap.items():
         max(0, min(_C, l_maxC_h(_L, _h)))
         for _L, _C in zip(L_points, L_points_C, strict=True)
     ]
+
+
+# strictly enforce curve bounds s.t. there are no intersections
+# order is determined by the max attained chromap
+max_Cstar_Horder = [
+    (h_str, max(Lpoints_Cstar))
+    for h_str, Lpoints_Cstar in Lpoints_Cstar_Hmap.items()
+]
+max_Cstar_Horder = sorted(max_Cstar_Horder, key=lambda t: t[1], reverse=True)
+
+for i in range(len(max_Cstar_Horder)-1):
+    outer_h, _ = max_Cstar_Horder[i]
+    inner_h, _ = max_Cstar_Horder[i+1]
+
+    Lpoints_Cstar_Hmap[inner_h] = [
+        min(inner_c, Lpoints_Cstar_Hmap[outer_h][ci])
+        for ci, inner_c in enumerate(Lpoints_Cstar_Hmap[inner_h])
+    ]

monobiome/plotting.py

@@ -1,7 +1,9 @@
 import numpy as np
 import matplotlib.pyplot as plt
 from coloraide import Color
+from matplotlib.collections import LineCollection
 
+from importlib.metadata import version
 from monobiome.palette import compute_hlc_map
 from monobiome.constants import (
     h_map,
@@ -9,6 +11,7 @@ from monobiome.constants import (
     L_points,
     accent_h_map,
     monotone_h_map,
+    max_Cstar_Horder,
     Lspace_Cmax_Hmap,
     Lpoints_Cstar_Hmap,
 )
@@ -74,24 +77,50 @@ def plot_hue_chroma_star() -> None:
     colors = accent_h_map.keys()
     #colors = set(["red", "orange", "yellow", "green", "blue"])
 
-    for h_str in Lpoints_Cstar_Hmap:
+    for h_str, _ in max_Cstar_Horder:
+        Lpoints_Cstar = Lpoints_Cstar_Hmap[h_str]
+
         if h_str not in accent_h_map or h_str not in colors:
             continue
-        ax.fill_between(
-            L_points,
-            Lpoints_Cstar_Hmap[h_str],
-            alpha=0.2,
-            color='grey',
-            label=h_str
-        )
 
-        x, y = L_points, Lpoints_Cstar_Hmap[h_str]
-        n = int(0.45*len(x))
-        ax.text(x[n], y[n]-0.01, h_str, rotation=10, va='center', ha='left')
+        _h = h_map[h_str]
+        h_colors = [
+            Color('oklch', [_l/100, _c, _h]).convert("srgb")
+            for _l, _c in zip(L_points, Lpoints_Cstar, strict=True)
+        ]
+
+        # # ax.fill_between(
+        # ax.scatter(
+        #     L_points,
+        #     Lpoints_Cstar,
+        #     alpha=0.7,
+        #     c=h_colors,
+        #     #alpha=0.2,
+        #     #color='grey',
+        #     label=h_str
+        # )
+        # x, y = L_points, Lpoints_Cstar_Hmap[h_str]
+        # n = int(0.45*len(x))
+        # ax.text(x[n], y[n]-0.01, h_str, rotation=10, va='center', ha='left')
+        
+        x = np.asarray(L_points)
+        y = np.asarray(Lpoints_Cstar)
+        pts = np.column_stack([x, y]).reshape(-1, 1, 2)
+        segs = np.concatenate([pts[:-1], pts[1:]], axis=1)
+        rgb = np.asarray(h_colors)
+        seg_colors = (rgb[:-1] + rgb[1:]) / 2
+
+        lc = LineCollection(segs, colors=seg_colors, linewidth=3,
+                            capstyle="round", joinstyle="round",
+                            label=h_str)
+        ax.add_collection(lc)
+        ax.autoscale_view()
         
     ax.set_xlabel("Lightness (%)")
     ax.set_xticks([L_points[0], 45, 50, 55, 60, 65, 70, L_points[-1]])
-    plt.suptitle("$C^*$ curves (v1.4.0)")
+
+    mb_version = version("monobiome")
+    plt.suptitle(f"$C^*$ curves (v{mb_version})")
     fig.show()
 
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "monobiome"
-version = "1.5.0"
+version = "1.5.1"
 description = "Monobiome color palette"
 requires-python = ">=3.12"
 authors = [

uv.lock

@@ -882,7 +882,7 @@ wheels = [
 
 [[package]]
 name = "monobiome"
-version = "1.5.0"
+version = "1.5.1"
 source = { editable = "." }
 dependencies = [
     { name = "coloraide" },