Eventually easing.

ease.py

@@ -0,0 +1,41 @@
+ease = 0.0, 0.02, 0.08, 0.18, 0.32, 0.5, 0.68, 0.82, 0.92, 0.98, 1.0
+
+def eased(from_, to):
+    interval = to - from_
+    for e in ease:
+        yield round(from_ + interval * e)
+
+def eased_xy(from_x, from_y, to_x, to_y):
+    yield from zip(eased(from_x, to_x), eased(from_y, to_y))
+
+
+def schedule_animation(callback, from_x, from_y, to_x, to_y, delay=25):
+    t = delay
+    coords = eased_xy(from_x, from_y, to_x, to_y)
+    next(coords)  # Discard the starting coords, we're already there!
+    for x, y in coords:
+        callback(t, x, y)  # Some after(...) call.
+        t += delay
+
+
+##def callback(t, x, y):
+##    canvas.after(t, lambda: canvas.moveto(tag, x, y))
+##    # Where tag comes from the surround scope.
+
+if __name__ == '__main__':
+
+    # Show it.
+
+    schedule_animation(print, 10, 1000, 1000, 10)
+
+    # Prints:
+    # 25 30 980
+    # 50 89 921
+    # 75 188 822
+    # 100 327 683
+    # 125 505 505
+    # 150 683 327
+    # 175 822 188
+    # 200 921 89
+    # 225 980 30
+    # 250 1000 10

ui.py

@@ -27,16 +27,6 @@ import data, stars
 DARK_GRAY = '#222'
 
 
-ease = 0.0, 0.02, 0.08, 0.18, 0.32, 0.5, 0.68, 0.82, 0.92, 0.98, 1.0
-
-def eased(from_, to):
-    interval = to - from_
-    for e in ease:
-        yield round(from_ + interval * e)
-
-def eased_xy(from_x, from_y, to_x, to_y):
-    yield from zip(eased(from_x, to_x), eased(from_y, to_y))
-
 class App:
     '''
     A canvas with scrolling support.