Added working e-reader example
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ZodiusInfuser
Phil Howard
parent
3f1ed1e2db
commit
eb8fcda727
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import badger2040
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import machine
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import time
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import gc
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gc.collect()
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# **** Put the name of your text file here *****
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text_file = "289-0.txt" # File must be on the MicroPython device
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# Global Constants
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WIDTH = badger2040.WIDTH
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HEIGHT = badger2040.HEIGHT
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ARROW_THICKNESS = 3
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ARROW_WIDTH = 18
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ARROW_HEIGHT = 14
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ARROW_PADDING = 2
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TEXT_PADDING = 4
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TEXT_SPACING = 20
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TEXT_SIZE = 0.5
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TEXT_WIDTH = WIDTH - TEXT_PADDING - TEXT_PADDING - ARROW_WIDTH
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# ------------------------------
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# Drawing functions
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# ------------------------------
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# Draw a upward arrow
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def draw_up(x, y, width, height, thickness, padding):
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border = (thickness // 4) + padding
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display.line(x + border, y + height - border,
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x + (width // 2), y + border)
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display.line(x + (width // 2), y + border,
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x + width - border, y + height - border)
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# Draw a downward arrow
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def draw_down(x, y, width, height, thickness, padding):
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border = (thickness // 2) + padding
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display.line(x + border, y + border,
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x + (width // 2), y + height - border)
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display.line(x + (width // 2), y + height - border,
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x + width - border, y + border)
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# Draw the frame of the reader
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def draw_frame():
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display.pen(15)
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display.clear()
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display.pen(12)
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display.rectangle(WIDTH - ARROW_WIDTH, 0, ARROW_WIDTH, HEIGHT)
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display.pen(0)
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display.thickness(ARROW_THICKNESS)
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if current_page > 1:
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draw_up(WIDTH - ARROW_WIDTH, (HEIGHT // 4) - (ARROW_HEIGHT // 2),
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ARROW_WIDTH, ARROW_HEIGHT, ARROW_THICKNESS, ARROW_PADDING)
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draw_down(WIDTH - ARROW_WIDTH, ((HEIGHT * 3) // 4) - (ARROW_HEIGHT // 2),
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ARROW_WIDTH, ARROW_HEIGHT, ARROW_THICKNESS, ARROW_PADDING)
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# ------------------------------
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# Program setup
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# ------------------------------
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# Global variables
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next_page = True
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prev_page = False
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last_offset = 0
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current_page = 0
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# Create a new Badger and set it to update FAST
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display = badger2040.Badger2040()
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display.update_speed(badger2040.UPDATE_FAST)
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# Set up the buttons
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button_down = machine.Pin(badger2040.BUTTON_DOWN, machine.Pin.IN, machine.Pin.PULL_DOWN)
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button_up = machine.Pin(badger2040.BUTTON_UP, machine.Pin.IN, machine.Pin.PULL_DOWN)
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# Set up the activity LED
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led = machine.Pin(badger2040.PIN_LED, machine.Pin.OUT)
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offsets = []
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# Button handling function
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def button(pin):
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global next_page, prev_page
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if pin == button_down:
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next_page = True
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if pin == button_up:
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prev_page = True
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# Register the button handling function with the buttons
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button_down.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
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button_up.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
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# ------------------------------
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# Render page
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# ------------------------------
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def render_page():
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row = 0
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line = ""
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pos = ebook.tell()
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next_pos = pos
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add_newline = False
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while True:
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# Read a full line and split it into words
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words = ebook.readline().split(" ")
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# Take the length of the first word and advance our position
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next_word = words[0]
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if len(words) > 1:
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next_pos += len(next_word) + 1
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else:
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next_pos += len(next_word) # This is the last word on the line
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# Advance our position further if the word contains special characters
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if '\u201c' in next_word:
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next_word.replace('\u201c', '\"')
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next_pos += 2
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if '\u201d' in next_word:
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next_word.replace('\u201d', '\"')
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next_pos += 2
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if '\u2019' in next_word:
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next_word.replace('\u2019', '\'')
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next_pos += 2
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# Rewind the file back from the line end to the start of the next word
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ebook.seek(next_pos)
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# Strip out any new line characters from the word
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next_word = next_word.strip()
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# If an empty word is encountered assume that means there was a blank line
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if len(next_word) == 0:
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add_newline = True
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# Append the word to the current line and measure its length
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appended_line = line
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if len(line) > 0 and len(next_word) > 0:
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appended_line += " "
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appended_line += next_word
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appended_length = display.measure_text(appended_line, TEXT_SIZE)
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# Would this appended line be longer than the text display area, or was a blank line spotted?
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if appended_length >= TEXT_WIDTH or add_newline:
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# Yes, so write out the line prior to the append
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print(line)
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display.pen(0)
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display.thickness(2)
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display.text(line, TEXT_PADDING, (row * TEXT_SPACING) + (TEXT_SPACING // 2) + TEXT_PADDING, TEXT_SIZE)
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# Clear the line and move on to the next row
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line = ""
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row += 1
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# Have we reached the end of the page?
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if (row * TEXT_SPACING) + (TEXT_SPACING // 2) > HEIGHT:
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print("+++++")
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display.update()
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# Reset the position to the start of the word that made this line too long
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ebook.seek(pos)
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return
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else:
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# Set the line to the word and advance the current position
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line = next_word
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pos = next_pos
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# A new line was spotted, so advance a row
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if add_newline:
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print("")
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row += 1
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if (row * TEXT_SPACING) + (TEXT_SPACING // 2) > HEIGHT:
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print("+++++")
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display.update()
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return
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add_newline = False
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else:
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# The appended line was not too long, so set it as the line and advance the current position
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line = appended_line
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pos = next_pos
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# ------------------------------
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# Main program loop
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# ------------------------------
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# Open the book file
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ebook = open(text_file, "r")
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while True:
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# Was the next page button pressed?
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if next_page:
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current_page += 1
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# Is the next page one we've not displayed before?
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if current_page > len(offsets):
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offsets.append(ebook.tell()) # Add its start position to the offsets list
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draw_frame()
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render_page()
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next_page = False # Clear the next page button flag
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# Was the previous page button pressed?
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if prev_page:
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if current_page > 1:
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current_page -= 1
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ebook.seek(offsets[current_page - 1]) # Retrieve the start position of the last page
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draw_frame()
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render_page()
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prev_page = False # Clear the prev page button flag
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time.sleep(0.1)
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