added checkbox to reverse colormap

kabuki/actor.py

@@ -31,10 +31,14 @@ class Actor:
             cfg.error_bars.on_click(plt.show_error_bars)
 
         if isinstance(cfg, ConfigDialog2D): #TODO
-            cfg.sel_cmap.value   = plt.palette
+            cfg.sel_cmap_palette.value = plt.cmap_palette
+            cfg.cb_cmap_reverse.active = plt.cmap_reverse
+
             cfg.sp_binning.value = plt.binning
 
-            cfg.sel_cmap.on_change("value",   cb(plt.change_cmap))
+            cfg.sel_cmap_palette.on_change("value", cb(plt.change_cmap_palette))
+            cfg.cb_cmap_reverse.on_click(plt.change_cmap_reverse)
+
             cfg.sp_vmin.on_change("value",    cb(plt.change_vmin))
             cfg.sp_vmax.on_change("value",    cb(plt.change_vmax))
             cfg.sp_binning.on_change("value", cb(plt.change_binning))

kabuki/cfgdlgs/cfgdlg2d.py

@@ -1,6 +1,7 @@
 from bokeh.models import Select, Spinner
 
 from ..buki import Column, Row
+from ..widgets import Checkbox
 
 
 CMAPS = [
@@ -15,13 +16,15 @@ class ConfigDialog2D(Column):
     def __init__(self):
         self.sp_cache_size = sp_cache_size = Spinner(title="Cache size:")
         sp_cache_size.disabled = True # 2D plot only shows the latest image
-        self.sel_cmap = sel_cmap = Select(title="Colormap", options=CMAPS)
+        self.sel_cmap_palette = sel_cmap_palette = Select(title="Colormap", options=CMAPS)
+        self.cb_cmap_reverse = cb_cmap_reverse = Checkbox(label="Reverse Colormap")
         self.sp_vmin = sp_vmin = Spinner(title="Minimum Value")
         self.sp_vmax = sp_vmax = Spinner(title="Maximum Value")
         self.sp_binning = sp_binning = Spinner(title="Binning", low=1)
         super().__init__(
             sp_cache_size,
-            sel_cmap,
+            sel_cmap_palette,
+            cb_cmap_reverse,
             Row(sp_vmin, sp_vmax),
             sp_binning
         )

kabuki/plots/plot2d.py

@@ -19,7 +19,9 @@ class Plot2D(Object):
         self.binning = 1
 
         self.cmap = cmap = LinearColorMapper()
-        self.change_cmap("Viridis")
+        self.cmap_palette = "Viridis"
+        self.cmap_reverse = False
+        self._update_cmap()
         cbar = ColorBar(color_mapper=cmap)
 
         fig = figure(name=name, match_aspect=True)
@@ -38,9 +40,19 @@ class Plot2D(Object):
         self.source.data.update(image=[image])
 
 
-    def change_cmap(self, name):
-        self.palette = name
-        self.cmap.palette = all_palettes[name][256]
+    def change_cmap_palette(self, name):
+        self.cmap_palette = name
+        self._update_cmap()
+
+    def change_cmap_reverse(self, state):
+        self.cmap_reverse = state
+        self._update_cmap()
+
+    def _update_cmap(self):
+        pal = all_palettes[self.cmap_palette][256]
+        if self.cmap_reverse:
+            pal = pal[::-1]
+        self.cmap.palette = pal
 
     def change_vmin(self, value):
         self.cmap.low = value