Examples: adding buzzer example

examples/buzzer.py

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+from presto import Presto, Buzzer
+from touch import Button
+from picovector import ANTIALIAS_FAST, PicoVector, Polygon, Transform
+
+presto = Presto()
+display = presto.display
+WIDTH, HEIGHT = display.get_bounds()
+
+# CONSTANTS
+CX = WIDTH // 2
+CY = HEIGHT // 2
+
+BUTTON_WIDTH = 110
+BUTTON_HEIGHT = 110
+
+# Pico Vector
+vector = PicoVector(display)
+vector.set_antialiasing(ANTIALIAS_FAST)
+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)
+
+# Couple of colours for use later
+WHITE = display.create_pen(255, 255, 255)
+RED = display.create_pen(230, 60, 45)
+BLACK = display.create_pen(0, 0, 0)
+
+# We'll need this for the touch element of the screen
+touch = presto.touch
+
+# Define our button vectors and touch button
+button = Button(CX - (BUTTON_WIDTH // 2), CY - (BUTTON_HEIGHT // 2), BUTTON_WIDTH, BUTTON_HEIGHT)
+button_vector = Polygon()
+button_vector.circle(CX, CY, 50)
+button_outline = Polygon()
+button_outline.circle(CX, CY, 54, 5)
+
+# Calculate our text positions now rather than in the main loop
+vector.set_font_size(28)
+x, y, w, h = vector.measure_text("TOUCH", x=0, y=0, angle=None)
+text_x = int(CX - (w // 2))
+text_y = int(CY + (h // 2))
+text_x_offset = text_x + 2
+text_y_offset = text_y + 2
+
+# Setup the buzzer. The Presto piezo is on pin 43.
+buzzer = Buzzer(43)
+
+while True:
+
+    # Check for touch changes
+    touch.poll()
+
+    # Clear the screen and set the background colour
+    display.set_pen(WHITE)
+    display.clear()
+
+    # Draw the touch button outline and inner section
+    display.set_pen(BLACK)
+    vector.draw(button_outline)
+    display.set_pen(RED)
+    vector.draw(button_vector)
+
+    # Draw vector text with drop shadow
+    display.set_pen(BLACK)
+    vector.text("TOUCH", text_x_offset, text_y_offset)
+    display.set_pen(WHITE)
+    vector.text("TOUCH", text_x, text_y)
+
+    # If we're pressing the onscreen button, play a tone!
+    # otherwise play nothing :)
+    if button.is_pressed():
+        buzzer.set_tone(150)
+    else:
+        buzzer.set_tone(-1)
+
+    # Finally, we update the screen so we can see our changes!
+    presto.update()