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167 | # Lab 20: Demo Reel
# A self-running showcase that needs no buttons -- good for a science
# fair table or open house. Cycles through all seven emotions, blinking
# briefly between each one so the transitions read as alive instead of a
# slideshow.
#
# On this display the demo reel is also the first program where a full
# screen wipe per transition is genuinely the right call: it happens once
# every two seconds, not sixty times a second, and it guarantees no
# leftovers from the previous face.
import config
import shapes
from utime import sleep
display = config.init_display()
WHITE = config.WHITE
BLACK = config.BLACK
NO_FILL = config.NO_FILL
FILL = config.FILL
FONT = config.SMALL_FONT
TOP_HALF = 3
BOTTOM_HALF = 12
BOTTOM_LEFT = 4
BOTTOM_RIGHT = 8
HALF_WIDTH = config.WIDTH // 2
EYE_SPACING = 48
LEFT_EYE_X = HALF_WIDTH - EYE_SPACING
RIGHT_EYE_X = HALF_WIDTH + EYE_SPACING
EYE_Y = 102
PUPIL_RADIUS = 8
EYEBROW_HALF_WIDTH = 24
EYEBROW_Y = EYE_Y - 40
MOUTH_Y = 164
LABEL_Y = 30
BLINK_RADIUS_Y = 14
STROKE = 4
def draw_eye(x, rx, ry):
shapes.ellipse(display, x, EYE_Y, rx, ry, WHITE, FILL)
shapes.ellipse(display, x, EYE_Y, PUPIL_RADIUS, PUPIL_RADIUS, BLACK, FILL)
def draw_eyes(rx, ry):
draw_eye(LEFT_EYE_X, rx, ry)
draw_eye(RIGHT_EYE_X, rx, ry)
def draw_eyebrow(x, side, tilt, lift):
y = EYEBROW_Y - lift
outer_x = x - (EYEBROW_HALF_WIDTH * side)
inner_x = x + (EYEBROW_HALF_WIDTH * side)
for offset in range(STROKE):
display.line(outer_x, y - tilt + offset,
inner_x, y + tilt + offset, WHITE)
def draw_eyebrows(tilt_left, tilt_right, lift=0):
draw_eyebrow(LEFT_EYE_X, 1, tilt_left, lift)
draw_eyebrow(RIGHT_EYE_X, -1, tilt_right, lift)
def draw_mouth_curve(radius_x, radius_y, mask):
for offset in range(STROKE):
shapes.ellipse(display, HALF_WIDTH, MOUTH_Y - offset,
radius_x, radius_y, WHITE, NO_FILL, mask)
def draw_mouth_flat(half_width):
display.fill_rect(HALF_WIDTH - half_width, MOUTH_Y,
half_width * 2, STROKE, WHITE)
def draw_mouth_open(radius_x, radius_y):
shapes.ellipse(display, HALF_WIDTH, MOUTH_Y, radius_x, radius_y,
WHITE, FILL)
def draw_mouth_smirk(half_width, side):
draw_mouth_flat(half_width)
corner_x = HALF_WIDTH + (half_width * side)
mask = BOTTOM_RIGHT if side > 0 else BOTTOM_LEFT
for offset in range(STROKE):
shapes.ellipse(display, corner_x, MOUTH_Y - 10 - offset, 14, 14,
WHITE, NO_FILL, mask)
def draw_happy():
draw_eyes(24, 24)
draw_eyebrows(0, 0, lift=5)
draw_mouth_curve(50, 24, BOTTOM_HALF)
def draw_sad():
draw_eyes(22, 22)
draw_eyebrows(-7, -7, lift=0)
draw_mouth_curve(40, 20, TOP_HALF)
def draw_angry():
draw_eyes(24, 12)
draw_eyebrows(12, 12, lift=-5)
draw_mouth_flat(26)
def draw_afraid():
draw_eyes(31, 31)
draw_eyebrows(-12, -12, lift=7)
draw_mouth_open(15, 22)
def draw_surprised():
draw_eyes(32, 32)
draw_eyebrows(0, 0, lift=14)
draw_mouth_open(20, 26)
def draw_disgusted():
draw_eyes(22, 15)
draw_eyebrows(10, -5, lift=-3)
for offset in range(STROKE):
shapes.ellipse(display, HALF_WIDTH - 14, MOUTH_Y - offset, 30, 18,
WHITE, NO_FILL, TOP_HALF)
def draw_contempt():
draw_eyes(24, 24)
draw_eyebrows(0, 0, lift=0)
draw_mouth_smirk(34, 1)
EMOTIONS = (
("Happy", draw_happy),
("Sad", draw_sad),
("Angry", draw_angry),
("Afraid", draw_afraid),
("Surprised", draw_surprised),
("Disgusted", draw_disgusted),
("Contempt", draw_contempt),
)
def show_emotion(name, draw):
display.fill(BLACK)
draw()
x = HALF_WIDTH - (len(name) * FONT.WIDTH) // 2
display.text(FONT, name, x, LABEL_Y, WHITE, BLACK)
def blink_transition():
display.fill(BLACK)
for x in (LEFT_EYE_X, RIGHT_EYE_X):
for offset in range(STROKE):
shapes.ellipse(display, x, EYE_Y + offset, 26, BLINK_RADIUS_Y,
WHITE, NO_FILL, TOP_HALF)
sleep(0.12)
while True:
for name, draw in EMOTIONS:
show_emotion(name, draw)
sleep(2)
blink_transition()
|
