primitives.py

# primitives.py micropython-touch demo of use of graphics primitives

# Released under the MIT License (MIT). See LICENSE.
# Copyright (c) 2021-2024 Peter Hinch

# touch_setup must be imported before other modules because of RAM use.
import touch_setup  # Create a display instance
from gui.core.tgui import Screen, Window, ssd, display

from gui.widgets import Label, CloseButton, Pad
from gui.core.writer import CWriter

# Font for CWriter
import gui.fonts.font10 as font
from gui.core.colors import *


def cb(obj, txt):
    print(f"Pad callback: text {txt}")


class BaseScreen(Screen):
    def __init__(self):

        super().__init__()
        wri = CWriter(ssd, font, GREEN, BLACK, verbose=False)

        col = 2
        row = 2
        Label(wri, row, col, "Primitives")
        text = "Touch this text."
        row = 135
        Label(wri, row, col, text, fgcolor=YELLOW)
        Label(wri, row + 20, col, "Or try long touch.")
        sl = wri.stringlen(text)
        Pad(
            wri,
            row,
            col,
            width=sl,
            callback=cb,
            args=("release",),
            lp_callback=cb,
            lp_args=("long",),
        )
        CloseButton(wri)  # Quit the application

    def after_open(self):
        display.usegrey(False)
        # Coordinates are x, y as per framebuf
        # circle method is in Display class only
        display.circle(70, 70, 30, RED)
        # These methods exist in framebuf, so also in SSD and Display
        ssd.hline(0, 127, 128, BLUE)
        ssd.vline(127, 0, 128, BLUE)


def test():
    print("Primitives demo.")
    Screen.change(BaseScreen)


test()