Examples: adding stop_watch.py

examples/stop_watch.py

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+import datetime
+import time
+
+from picovector import ANTIALIAS_BEST, PicoVector, Polygon, Transform
+from presto import Presto
+from touch import Button
+
+presto = Presto()
+display = presto.display
+WIDTH, HEIGHT = display.get_bounds()
+
+CX = WIDTH // 2
+CY = HEIGHT // 2
+
+# Couple of colours for use later
+WHITE = display.create_pen(255, 255, 255)
+RED = display.create_pen(230, 60, 45)
+GREEN = display.create_pen(9, 185, 120)
+BLACK = display.create_pen(0, 0, 0)
+
+# We'll need this for the touch element of the screen
+touch = presto.touch
+
+# Pico Vector
+vector = PicoVector(display)
+vector.set_antialiasing(ANTIALIAS_BEST)
+t = Transform()
+
+vector.set_font("Roboto-Medium.af", 54)
+vector.set_font_letter_spacing(100)
+vector.set_font_word_spacing(100)
+vector.set_transform(t)
+
+# Touch buttons
+start_button = Button(1, HEIGHT - 50, CX - 2, 49)
+stop_button = Button(WIDTH - CX, HEIGHT - 50, CX - 2, 49)
+
+start = Polygon()
+start.rectangle(*start_button.bounds, (5, 5, 5, 5))
+
+stop = Polygon()
+stop.rectangle(*stop_button.bounds, (5, 5, 5, 5))
+
+outline = Polygon()
+outline.rectangle(5, 20, WIDTH - 10, HEIGHT - 100, (5, 5, 5, 5), 2)
+
+
+class StopWatch(object):
+
+    def __init__(self):
+        self.start_time = 0
+        self.elapsed = 0
+        self.running = False
+
+    def start(self):
+
+        self.running = True
+        if self.start_time:
+            self.start_time = time.ticks_ms() - self.elapsed
+        else:
+            self.start_time = time.ticks_ms()
+
+    def stop(self):
+
+        self.running = False
+
+    def reset(self):
+
+        self.start_time = 0
+        self.elapsed = 0
+
+    def return_string(self):
+
+        if self.running:
+            self.elapsed = time.ticks_ms() - self.start_time
+
+        dt = datetime.timedelta(hours=0, minutes=0, seconds=0, milliseconds=self.elapsed)
+
+        return str(dt)[:10]
+
+
+timer = StopWatch()
+
+while True:
+
+    display.set_pen(WHITE)
+    display.clear()
+
+    display.set_pen(GREEN)
+    vector.draw(start)
+
+    display.set_pen(RED)
+    vector.draw(stop)
+
+    display.set_pen(BLACK)
+    vector.draw(outline)
+
+    vector.set_font_size(32)
+    if timer.elapsed and timer.running is False:
+        vector.text("Resume", start_button.bounds[0] + 10, start_button.bounds[1] + 33)
+    else:
+        vector.text("Start", start_button.bounds[0] + 27, start_button.bounds[1] + 33)
+
+    if timer.running:
+        vector.text("Stop", stop_button.bounds[0] + 30, stop_button.bounds[1] + 33)
+    else:
+        vector.text("Reset", stop_button.bounds[0] + 25, stop_button.bounds[1] + 33)
+
+    if start_button.is_pressed() and timer.running is False:
+        timer.start()
+
+    if stop_button.is_pressed():
+        if timer.running:
+            timer.stop()
+            while stop_button.is_pressed():
+                touch.poll()
+        else:
+            timer.reset()
+
+    time_string = timer.return_string()
+    vector.set_font_size(54)
+    vector.text(f"{time_string}", 10, 110)
+
+    presto.update()