add example of swipe

TODO: simplify
TODO: fix bug with black color in oriented modes

src/apps/playground/__init__.py

@@ -1,3 +1,4 @@
+import utime
 from trezor import loop
 from trezor import ui
 from trezor.utils import unimport_func
@@ -149,6 +150,73 @@ class PinDialog():
                 return result
 
 
+SWIPE_DISTANCE_THRESHOLD = const(20)  # Min pixels in the primary direction
+SWIPE_VELOCITY_THRESHOLD = const(200)  # Min pixels/second
+SWIPE_RATIO_THRESHOLD = const(30)  # Max ratio secondary to primary direction in %
+
+SWIPE_UP = const(180)
+SWIPE_DOWN = const(0)
+SWIPE_LEFT = const(90)
+SWIPE_RIGHT = const(270)
+
+
+class Swipe():
+
+    def __init__(self, area=None):
+        self.area = area or (0, 0, 240, 240)
+        self.start_pos = None
+        self.start_time = 0
+        self.end_pos = None
+        self.end_time = 0
+
+    def send(self, event, pos):
+
+        if event is loop.TOUCH_START and in_area(pos, self.area):
+            self.start_time = utime.time()
+            self.start_pos = pos
+
+        elif event is loop.TOUCH_END and self.start_pos is not None:
+            self.end_time = utime.time()
+            self.end_pos = pos
+            td = self.end_time - self.start_time
+            pdx = self.end_pos[0] - self.start_pos[0]
+            pdy = self.end_pos[1] - self.start_pos[1]
+            pdxa = abs(pdx)
+            pdya = abs(pdy)
+            if pdxa > pdya:
+                # Horizontal direction
+                velx = pdx / td
+                velxa = abs(velx)
+                ratio = int(pdya / pdxa * 100) if pdxa > 0 else 100
+                print('velxa', velxa, 'pdxa', pdxa, 'ratio', ratio)
+                if (velxa >= SWIPE_VELOCITY_THRESHOLD
+                        and pdxa >= SWIPE_DISTANCE_THRESHOLD
+                        and ratio <= SWIPE_RATIO_THRESHOLD):
+                    return SWIPE_RIGHT if pdx > 0 else SWIPE_LEFT
+            else:
+                # Vertical direction
+                vely = pdy / td
+                velya = abs(vely)
+                ratio = int(pdxa / pdya * 100) if pdya > 0 else 100
+                print('velya', velya, 'pdya', pdya, 'ratio', ratio)
+                if (velya >= SWIPE_VELOCITY_THRESHOLD
+                        and pdya >= SWIPE_DISTANCE_THRESHOLD
+                        and ratio <= SWIPE_RATIO_THRESHOLD):
+                    return SWIPE_DOWN if pdy > 0 else SWIPE_UP
+            # No swipe, reset the state
+            self.start_pos = None
+            self.start_time = 0
+            self.end_pos = None
+            self.end_time = 0
+
+    def wait(self):
+        while True:
+            event, *pos = yield loop.Select(loop.TOUCH_START, loop.TOUCH_END)
+            result = self.send(event, pos)
+            if result is not None:
+                return result
+
+
 def layout_tap_to_confirm(address, amount, currency):
 
     # ui.display.bar(0, 0, 240, 40, ui.GREEN)
@@ -171,14 +239,22 @@ def layout_tap_to_confirm(address, amount, currency):
 
     # animation = ui.animate_pulse(func, ui.BLACK, ui.GREY, speed=200000)
 
-    pin_dialog = PinDialog()
-    pin_result = yield from pin_dialog.wait_for_result()
+    # pin_dialog = PinDialog()
+    # pin_result = yield from pin_dialog.wait_for_result()
+
+    # if pin_result is PIN_CONFIRMED:
+    #     print('PIN confirmed:', pin_dialog.pin)
+
+    # elif pin_result is PIN_CANCELLED:
+    #     print('PIN CANCELLED, go home')
 
-    if pin_result is PIN_CONFIRMED:
-        print('PIN confirmed:', pin_dialog.pin)
+    degrees = 0
 
-    elif pin_result is PIN_CANCELLED:
-        print('PIN CANCELLED, go home')
+    while True:
+        ui.display.bar(0, 0, 240, 240, ui.BLACK)
+        ui.display.text_center(120, 130, 'HELLO WORLD!', ui.NORMAL, ui.WHITE, ui.BLACK)
+        degrees = yield from Swipe().wait()
+        ui.display.orientation(degrees)
 
 
 @unimport_func