# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""
This example runs on PyPortal, or any Circuit Python device
with a built-in screen.

It will use adafruit_bitmap_font to load a font and fill a
bitmap with pixels matching glyphs from a given String
"""

import board
import displayio

from adafruit_bitmap_font import bitmap_font

# use built in display (MagTag, PyPortal, PyGamer, PyBadge, CLUE, etc.)
# see guide for setting up external displays (TFT / OLED breakouts, RGB matrices, etc.)
# https://learn.adafruit.com/circuitpython-display-support-using-displayio/display-and-display-bus
display = board.DISPLAY

# NOTE: You must copy the fonts/ folder from the
# examples in the repo to your CIRCUITPY drive.
# try uncommenting different font files if you like
font_file = "fonts/LeagueSpartan-Bold-16.bdf"
# font_file = "fonts/Junction-regular-24.pcf"

font = bitmap_font.load_font(font_file)

bitmap = displayio.Bitmap(display.width, display.height, 2)

palette = displayio.Palette(2)

palette[0] = 0x000000
palette[1] = 0xFFFFFF

_, height, _, dy = font.get_bounding_box()
for y in range(height):
    pixels = []
    for c in "Adafruit CircuitPython":
        glyph = font.get_glyph(ord(c))
        if not glyph:
            continue
        glyph_y = y + (glyph.height - (height + dy)) + glyph.dy

        if 0 <= glyph_y < glyph.height:
            for i in range(glyph.width):
                value = glyph.bitmap[i, glyph_y]
                pixel = 0
                if value > 0:
                    pixel = 1
                pixels.append(pixel)
        else:
            # empty section for this glyph
            for i in range(glyph.width):
                pixels.append(0)

        # one space between glyph
        pixels.append(0)

    if pixels:
        for x, pixel in enumerate(pixels):
            bitmap[x, y] = pixel

# Create a TileGrid to hold the bitmap
tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)

# Create a Group to hold the TileGrid
group = displayio.Group()

group.x = 20
# Add the TileGrid to the Group
group.append(tile_grid)

# Add the Group to the Display
display.root_group = group

while True:
    pass