Simple test

Ensure your device works with this simple test.

examples/displayio_effects_simpletest.py
 1# SPDX-FileCopyrightText: 2021 GaryZ, Alec Delaney
 2# SPDX-FileCopyrightText: Copyright (c) 2022 Alec Delaney for CircuitPython Organization
 3#
 4# SPDX-License-Identifier: Unlicense
 5#############################
 6"""
 7Use the random fluctuation effect for the Dial.
 8"""
 9
10import board
11import displayio
12import terminalio
13from displayio_dial import Dial
14from displayio_effects import fluctuation_effect
15
16# Fonts used for the Dial tick labels
17tick_font = terminalio.FONT
18
19display = board.DISPLAY  # create the display on the PyPortal or Clue (for example)
20# otherwise change this to setup the display
21# for display chip driver and pinout you have (e.g. ILI9341)
22
23
24# Define the minimum and maximum values for the dial
25minimum_value = 0
26maximum_value = 100
27
28# Hook in the throttle effect for the Dial widget
29fluctuation_effect.hook_fluctuation_effect(Dial, "value")
30
31# Create a Dial widget
32my_dial = Dial(
33    x=20,  # set x-position of the dial inside of my_group
34    y=20,  # set y-position of the dial inside of my_group
35    width=180,  # requested width of the dial
36    height=180,  # requested height of the dial
37    padding=25,  # add 25 pixels around the dial to make room for labels
38    start_angle=-120,  # left angle position at -120 degrees
39    sweep_angle=240,  # total sweep angle of 240 degrees
40    min_value=minimum_value,  # set the minimum value shown on the dial
41    max_value=maximum_value,  # set the maximum value shown on the dial
42    tick_label_font=tick_font,  # the font used for the tick labels
43    tick_label_scale=2.0,  # the scale factor for the tick label font
44)
45
46
47my_group = displayio.Group()
48my_group.append(my_dial)
49
50display.show(my_group)  # add high level Group to the display
51
52# Set the dial to the value before turning on the fluctuation effect
53my_dial.value = 50
54
55my_dial.fluctuation_amplitude = 5  # Fluctuate at most "5" in either direction
56my_dial.fluctuation_move_rate = 0.01  # Fluctuate at "0.01" per throttle_update()
57
58while True:
59
60    my_dial.update_fluctuation()