smooth color bars

gui/progressbar.py

@@ -29,6 +29,7 @@ class ProgressBar(Drawable):
     ):
         assert width > 2
         assert height > 2
+        self.characters = "▁▂▃▄▅▆▇█"
         self.value = value
         self.max = max_value
         self.text = text
@@ -52,11 +53,19 @@ class ProgressBar(Drawable):
 
     def draw(self):
         self.window.erase()
-        # draw bar
-        top = self.height - int(self.value / self.max * self.height)
+        # calculate bar height
         bottom = self.height
-        for i in range(top, bottom):
-            self.window.insstr(i, 0, " " * self.width, self.attr)
+        top_exact = self.value / self.max * self.height
+        top_full = self.height - int(top_exact)  # completely filled pixel height
+        top_fraction = top_exact % 1  # partly filled pixel
+        # draw bar
+        if top_fraction:
+            # partly filled pixel
+            char_idx = int(top_fraction * 8)
+            self.window.insstr(top_full - 1, 0, self.characters[char_idx] * self.width, self.attr)
+        for i in range(top_full, bottom):
+            # full pixel
+            self.window.insstr(i, 0, self.characters[-1] * self.width, self.attr)
         self.window.refresh()
 
     def set(self, value):

nchl.py

@@ -36,10 +36,10 @@ class NCHL:
         # init colors
         curses.start_color()
         curses.use_default_colors()
-        curses.init_pair(curses.COLOR_RED, 0, curses.COLOR_RED)
-        curses.init_pair(curses.COLOR_GREEN, 0, curses.COLOR_GREEN)
-        curses.init_pair(curses.COLOR_BLUE, 0, curses.COLOR_BLUE)
-        curses.init_pair(curses.COLOR_WHITE, 0, curses.COLOR_WHITE)
+        curses.init_pair(curses.COLOR_RED, curses.COLOR_RED, -1)
+        curses.init_pair(curses.COLOR_GREEN, curses.COLOR_GREEN, -1)
+        curses.init_pair(curses.COLOR_BLUE, curses.COLOR_BLUE, -1)
+        curses.init_pair(curses.COLOR_WHITE, curses.COLOR_WHITE, -1)
         curses.init_pair(curses.COLOR_YELLOW, curses.COLOR_YELLOW, -1)
 
         try: