kopia lustrzana https://github.com/peterhinch/micropython-samples
100 wiersze
3.7 KiB
Python
100 wiersze
3.7 KiB
Python
# writer.py Implements the Writer class.
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# V0.2 Peter Hinch Dec 2016: supports updated framebuf module.
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# The MIT License (MIT)
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#
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# Copyright (c) 2016 Peter Hinch
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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# A Writer supports rendering text to a Display instance in a given font.
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# Multiple Writer instances may be created, each rendering a font to the
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# same Display object.
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class Writer(object):
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text_row = 0 # attributes common to all Writer instances
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text_col = 0
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row_clip = False # Clip or scroll when screen full
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col_clip = False # Clip or new line when row is full
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@classmethod
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def set_textpos(cls, row, col):
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cls.text_row = row
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cls.text_col = col
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@classmethod
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def set_clip(cls, row_clip, col_clip):
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cls.row_clip = row_clip
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cls.col_clip = col_clip
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def __init__(self, device, font):
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super().__init__()
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self.device = device
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self.font = font
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if font.hmap():
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raise OSError('Font must be vertically mapped')
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self.screenwidth = device.width # In pixels
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self.screenheight = device.height
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def _newline(self):
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height = self.font.height()
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Writer.text_row += height
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Writer.text_col = 0
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margin = self.screenheight - (Writer.text_row + height)
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if margin < 0:
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if not Writer.row_clip:
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self.device.scroll(0, margin)
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Writer.text_row += margin
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def printstring(self, string):
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for char in string:
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self._printchar(char)
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def _printchar(self, char):
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if char == '\n':
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self._newline()
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return
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glyph, char_height, char_width = self.font.get_ch(char)
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if Writer.text_row + char_height > self.screenheight:
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if Writer.row_clip:
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return
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self._newline()
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if Writer.text_col + char_width > self.screenwidth:
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if Writer.col_clip:
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return
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else:
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self._newline()
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div, mod = divmod(char_height, 8)
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gbytes = div + 1 if mod else div # No. of bytes per column of glyph
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device = self.device
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for scol in range(char_width): # Source column
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dcol = scol + Writer.text_col # Destination column
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drow = Writer.text_row # Destination row
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for srow in range(char_height): # Source row
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gbyte, gbit = divmod(srow, 8)
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if drow >= self.screenheight:
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break
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if gbit == 0: # Next glyph byte
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data = glyph[scol * gbytes + gbyte]
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device.pixel(dcol, drow, data & (1 << gbit))
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drow += 1
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Writer.text_col += char_width
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