christian-oudard · June 25, 2020 23:35 · Jun 25, 2020
diff --git a/braille.py b/braille.py
@@ -0,0 +1,55 @@
+import math
+import shutil
+
+# Braille bit order:
+# 0 3
+# 1 4
+# 2 5
+# 6 7
+
+# bit: (x, y)
+dot_positions = {
+    0: (0, 0),
+    1: (0, 1),
+    2: (0, 2),
+    3: (1, 0),
+    4: (1, 1),
+    5: (1, 2),
+    6: (0, 3),
+    7: (1, 3),
+}
+bit_positions = { pos: i for (i, pos) in dot_positions.items() }
+
+n_columns, n_lines = shutil.get_terminal_size()
+n_columns, n_lines = (40, 20)
+cell_width, cell_height = (2, 4)
+width = n_columns * cell_width
+height = n_lines * cell_height
+
+screen_lines = [ bytearray(n_columns) for _ in range(n_lines) ]
+
+def set_dot(x, y):
+    cell_x, rem_x = divmod(x, cell_width)
+    cell_y, rem_y = divmod(y, cell_height)
+    bit_index = bit_positions[(rem_x, rem_y)]
+    screen_lines[cell_y][cell_x] |= (1 << bit_index)
+
+
+braille_offset = 0x2800
+
+def show_screen():
+    for line in screen_lines:
+        line_chars = [ chr(braille_offset + b) for b in line ]
+        print(''.join(line_chars))
+
+
+if __name__ == '__main__':
+    for i in range(80):
+        set_dot(i, i)
+        set_dot(i, 80 - i - 1)
+    for a in range(256):
+        theta = 2*math.pi * a / 256
+        x = round(40 + 38*math.cos(theta))
+        y = round(40 + 38*math.sin(theta))
+        set_dot(x, y)
+    show_screen()
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