175 lines
6.1 KiB
Python
175 lines
6.1 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2021 Francesco Gazzetta
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"""Morse translator and notepad
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This app is a simple morse translator that also doubles as a notepad.
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Swipe up for a line, swipe down for a dot, tap for end letter, double tap for
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end word. Swipe right for space, twice for newline. Swipe left to delete
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character.
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Up to 7 lines of translation will be displayed on a 240x240 screen, and old
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lines will be deleted.
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There is a preview of the next letter at the bottom of the screen.
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.. figure:: res/MorseApp.png
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:width: 179
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"""
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import wasp
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import icons
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import fonts
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from math import floor
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from micropython import const
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_WIDTH = const(240)
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_HEIGHT = const(240)
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# No easy way to make this depend on _WIDTH
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_MAXINPUT = const(16)
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# These two need to match
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_FONTH = const(24)
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_FONT = fonts.sans24
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# Precomputed for efficiency
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_LINEH = const(30) # int(_FONTH * 1.25)
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_MAXLINES = const(7) # floor(_HEIGHT / _LINEH) - 1 # the "-1" is the input line
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# The morse lookup table, represented as a flattened binary tree.
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# The head is the value of the node, the tail are the subtrees:
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# left half of the tail = the next symbol is a dot
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# right half of the tail = the next symbol is a line
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_CODE = " eish54v?3uf????2arl?????wp??j?1tndb6?x??kc??y??mgz7?q??o?8??90"
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# uppercase:
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#_CODE = " EISH54V?3UF????2ARL?????WP??J?1TNDB6?X??KC??Y??MGZ7?Q??O?8??90"
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# letters only:
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#_CODE = " EISHVUF?ARL?WPJTNDBXKCYMGZQO??"
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class MorseApp():
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NAME = 'Morse'
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# 2-bit RLE, 96x64, generated from res/morse_icon.png, 143 bytes
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ICON = (
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b'\x02'
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b'`@'
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b'?\xff\xff\xff\xff\x13\xc4?\x1c\xc6?\x1b\xc6?\x1b\xc6'
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b'?\x1a\xc8?\x19\xc8?\x18\xca?\x17\xc4\x02\xc4?\x17'
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b'\xc4\x02\xc4?\x16\xc5\x02\xc5?\x15\xc4\x04\xc4?\x15\xc4'
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b'\x04\xc4?\x14\xc4\x06\xc4?\x13\xc4\x06\xc4?\x12\xc5\x06'
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b'\xc5?\x11\xc4\x08\xc4?\x11\xd0?\x10\xd2?\x0f\xd2?'
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b'\x0e\xc5\n\xc4?\x0e\xc4\x0c\xc4?\r\xc4\x0c\xc4?\x0c'
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b'\xc5\x0c\xc5?\x0b\xc4\x0e\xc4?\x0b\xc4\x0e\xc4?\n\xc4'
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b'\x10\xc4?\xff\xff\xff\xff\x83\xc4\x0e\xda4\xc4\x0e\xda4'
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b'\xc4\x0e\xda4\xc4\x0e\xda?\xff\xff\xff\xfe'
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)
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def __init__(self):
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self.letter = ""
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self.text = [""]
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def foreground(self):
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try:
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f = open("Morse.txt", "r")
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text = "".join(f.readlines()).replace("\n", "%").replace("%%", "%")
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f.close()
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text = text.split("%")
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if len(text) > _MAXLINES:
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text = text[-_MAXLINES:]
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self.text = text
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except:
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self.text = [""]
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self._draw()
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wasp.system.request_event(wasp.EventMask.TOUCH |
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wasp.EventMask.SWIPE_LEFTRIGHT |
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wasp.EventMask.SWIPE_UPDOWN)
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def background(self):
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text = "%".join(self.text)
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f = open("Morse.txt", "w")
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for line in text:
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f.write(line)
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f.close()
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def swipe(self, event):
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if event[0] == wasp.EventType.LEFT:
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if self.letter == "":
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if self.text[-1] == "" and len(self.text) > 1:
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self.text.pop(-1)
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else:
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self.text[-1] = str(self.text[-1])[:-1]
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self.letter = ""
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self.text[-1] = "{} ".format(self.text[-1]) # adds space, otherwise the screen will not be erased there
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self._update()
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self.text[-1] = str(self.text[-1])[:-2] # removes space
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elif event[0] == wasp.EventType.RIGHT:
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if self.text[-1].endswith(" "):
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self.text.append("")
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self._draw()
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else:
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self._add_letter(" ")
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else:
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if len(self.letter) < _MAXINPUT:
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self.letter += "-" if event[0] == wasp.EventType.UP else "."
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self._update()
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def touch(self, event):
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self._add_letter(self._lookup(self.letter))
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def _add_letter(self, addition):
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merged = self.text[-1] + addition
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# Check if the new text overflows the screen and add a new line if that's the case
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split = wasp.watch.drawable.wrap(merged, _WIDTH)
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if len(split) > 2:
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self.text.append(self.text[-1][split[1]:split[2]] + addition)
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self.text[-2] = self.text[-2][split[0]:split[1]]
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if len(self.text) > _MAXLINES:
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self.text.pop(0)
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# Ideally a full refresh should be done only when we exceed
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# _MAXLINES, but this should be fast enough
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self._draw()
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else:
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self.text[-1] = merged
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self.letter = ""
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self._update()
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def _draw(self):
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"""Draw the display from scratch"""
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draw = wasp.watch.drawable
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draw.fill()
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i = 0
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for line in self.text:
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draw.string(line, 0, _LINEH * i)
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i += 1
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self._update()
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def _update(self):
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"""Update the dynamic parts of the application display, specifically the
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input line and last line of the text.
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The full text area is updated in _draw() instead."""
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draw = wasp.watch.drawable
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draw.string(self.text[-1], 0, _LINEH*(len(self.text)-1))
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guess = self._lookup(self.letter)
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draw.string("{} {}".format(self.letter, guess), 0, _HEIGHT - _FONTH, width=_WIDTH)
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def _lookup(self, s):
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i = 0 # start of the subtree (current node)
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l = len(_CODE) # length of the subtree
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for c in s:
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# first discard the head, which represent the previous guess
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i += 1
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l -= 1
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# Check if we can no longer bisect while there are still dots/lines
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if l <= 0: return "?"
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# Update the bounds to the appropriate subtree
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# (left or right of the tail).
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# The length will always be half:
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l //= 2
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# The index will be either at the beginning of the tail,
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# or at its half, in which case we subtract the current length,
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# which is half of the old length:
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if c == "-": i += l
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return _CODE[i]
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