grow-python/examples/display.py

import time
import ST7735
import random
import math
from PIL import Image, ImageDraw, ImageFont
from fonts.ttf import RobotoMedium as UserFont
import RPi.GPIO as GPIO

from grow.moisture import Moisture
from grow.pump import Pump

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

BUTTONS = [5, 6, 16, 24]
LABELS = ['A', 'B', 'X', 'Y']

channel_count = 3
channel_selected = 0

sensors = [
    Moisture(channel=1),
    Moisture(channel=2),
    Moisture(channel=3)
]

pumps = [
    Pump(channel=1),
    Pump(channel=2),
    Pump(channel=3)
]

GPIO.setup(BUTTONS, GPIO.IN, pull_up_down=GPIO.PUD_UP)

font = ImageFont.truetype(UserFont, 14)

def handle_button(pin):
    global channel_selected
    index = BUTTONS.index(pin)
    label = LABELS[index]
    if label == 'A':
        channel_selected += 1
        channel_selected %= channel_count
    print("Button {} pressed! Channel: {}".format(label, channel_selected))

for pin in BUTTONS:
    GPIO.add_event_detect(pin, GPIO.FALLING, handle_button, bouncetime=150)

display = ST7735.ST7735(
    port=0,
    cs=1,
    dc=9,
    backlight=12,
    rotation=270,
    spi_speed_hz=80000000
)

ramp = [
    (192, 225, 254),  # Blue
    (196, 255, 209),  # Green
    (255, 243, 192),  # Yellow
    (254, 192, 192)   # Red
]

ramp_sat = [
    (32, 137, 251),   # Blue
    (100, 255, 124),  # Green
    (254, 219, 82),   # Yellow
    (254, 82, 82),    # Red
]


def indicator_color(value, r=None):
    if r is None:
        r = ramp
    if value == 1.0:
        return r[-1]
    if value == 0.0:
        return r[0]

    value *= len(r) - 1
    a = int(math.floor(value))
    b = a + 1
    blend = float(value - a)

    r, g, b = [int(((r[b][i] - r[a][i]) * blend) + r[a][i]) for i in range(3)]

    return (r, g, b)


display.begin()

WIDTH, HEIGHT = display.width, display.height

# Only the ALPHA channel is used from these images
icon_drop = Image.open("icons/icon-drop.png")
icon_nodrop = Image.open("icons/icon-nodrop.png")
icon_rightarrow = Image.open("icons/icon-rightarrow.png")
icon_snooze = Image.open("icons/icon-snooze.png")

plants = []

for x in range(1, 15):
    plants.append(Image.open("icons/flat-{}.png".format(x)))

CHANNEL_W = 40
CHANNEL_M = 2

print(WIDTH, HEIGHT)

image = Image.new("RGBA", (WIDTH, HEIGHT), color=(255, 255, 255))
draw = ImageDraw.Draw(image)

draw.rectangle((0, 0, 19, 19), (32, 138, 251))
draw.rectangle((0, HEIGHT - 19, 19, HEIGHT), (255, 255, 255))
draw.rectangle((WIDTH - 20, 0, WIDTH, 19), (75, 166, 252))
draw.rectangle((WIDTH - 20, HEIGHT - 19, WIDTH, HEIGHT), (254, 218, 80))

def icon(image, icon, position, color):
    col = Image.new("RGBA", (20, 20), color=color)
    image.paste(col, position, mask=icon)

icon(image, icon_rightarrow, (0, 0), (255, 255, 255))
icon(image, icon_snooze, (0, HEIGHT - 20), (129, 129, 129))
icon(image, icon_drop, (WIDTH - 20, 0), (255, 255, 255))
icon(image, icon_nodrop, (WIDTH - 20, HEIGHT - 20), (255, 255, 255))

def plant(image, plant, channel):
    x = [18, 58, 98][channel]
    y = HEIGHT - plant.height
    image.paste(plant, (x, y), mask=plant)

picked = random.sample(plants, 3)

# image.save("test.png")

while True:
    t = time.time() / 10.0
    #c1 = (math.sin(math.pi + t * math.pi) + 1.0) / 2.0
    #c2 = (math.sin(t * math.pi) + 1.0) / 2.0
    #c3 = (math.sin(math.pi + t * math.pi) + 1.0) / 2.0
    c1 = 1.0 - sensors[0].saturation
    c2 = 1.0 - sensors[1].saturation
    c3 = 1.0 - sensors[2].saturation
    print(c1, c2, c3)

    draw.rectangle((21, 0, 138, HEIGHT), (255, 255, 255))  # Erase channel area

    # Draw background bars
    draw.rectangle((21, int(c1 * HEIGHT), 58, HEIGHT), indicator_color(c1))
    draw.rectangle((61, int(c2 * HEIGHT), 98, HEIGHT), indicator_color(c2))
    draw.rectangle((101, int(c3 * HEIGHT), 138, HEIGHT), indicator_color(c3))

    # Draw plant images
    for p in range(3):
        plant(image, picked[p], p)

    # Channel selection icons
    draw.rectangle((33, 2, 48, 17), indicator_color(c1, ramp_sat))
    draw.rectangle((33 + 40, 2, 48 + 40, 17), indicator_color(c2, ramp_sat))
    draw.rectangle((33 + 80, 2, 48 + 80, 17), indicator_color(c3, ramp_sat))

    selected_x = 21 + (40 * channel_selected) + 10
    draw.rectangle((selected_x, 0, selected_x + 19, 20), indicator_color([c1, c2, c3][channel_selected], ramp_sat))

    draw.polygon([
        (selected_x, 20),
        (selected_x + 9, 25),
        (selected_x + 19, 20)
    ],
    fill=indicator_color([c1, c2, c3][channel_selected], ramp_sat))

    draw.text((33 + 3, 2), "1", font=font, fill=(255, 255, 255))
    draw.text((33 + 40 + 4, 2), "2", font=font, fill=(255, 255, 255))
    draw.text((33 + 80 + 4, 2), "3", font=font, fill=(255, 255, 255))

    # Erase snooze icon
    draw.rectangle((0, HEIGHT - 19, 19, HEIGHT), (255, 255, 255))
    r = int(((math.sin(time.time() * 3 * math.pi) + 1.0) / 2.0) * 255)
    icon(image, icon_snooze, (0, HEIGHT - 20), (r, 129, 129))

    display.display(image.convert("RGB"))
    time.sleep(1.0 / 5)