class MaxDraw():
def __init__(self, display_count=1, spi_port=0, spi_clock=1000000):
self.__displayCount = display_count
self._displayCanvas = Canvas(8*display_count, 8)
self._max = Max7219(spi_port, spi_clock, display_count)
self.width = self._displayCanvas.getWidth()
self.height = self._displayCanvas.getHeight()
#self._displayCanvas = self._max._displayCanvas
def __del__(self):
#self.stop()
pass
def init(self):
"""Initializes the display"""
self._max.init(0x00)
def stop(self):
"""Stops using the display"""
self._max.shutdown()
def prepareString(self, str, font):
"""Returns a Canvas object with the rasterized string"""
tmpCanvas = Canvas(8*len(str), 8)
offset = 0
for char in str:
glyph = font.getChar(char)
tmpCanvas.fromBytes(glyph, offset)
offset += font.getCharSize(char) + font.getLetterSpace(char)
return tmpCanvas
def paintCanvas(self):
"""Sends _displayCanvas to the MAX7219 to be displayed"""
for d in range(self._max.getDisplayCount()):
self._max.setDisplay(d+1)
for x in range(8):
#print "X: " + str(x) + " - COL: " + str(d*8+x) + " - BIN: " + str(self._displayCanvas.getCol(d*8 + x))
self._max.send(self._max.DIGIT_0 + x, ord(self._displayCanvas.getCol(d*8 + x).tobytes()))
def paintNoise(self, ratio):
"""Returns a canvas filled with random noise using ratio as threshold."""
tmpCanvas = Canvas(self.width, self.height)
for b in range(tmpCanvas.getSize()):
tmpCanvas._c[b] = False if random.random() > ratio else True
return tmpCanvas
