def printChar(self, c, bg_buf=None):
# get the charactes pixel bitmap and dimensions
if self.text_font:
fmv, rows, cols = self.text_font.get_ch(c)
else:
raise AttributeError('No font selected')
cbytes, cbits = divmod(cols, 8) # Not in packed format
dcols = (cbytes + 1) * 8 if cbits else cbytes * 8 # cols for display
pix_count = dcols * rows # number of bits in the char
# test char fit
if self.text_x + cols > self.text_width: # does the char fit on the screen?
if self.text_scroll:
self.printCR() # No, then CR
self.printNewline(True) # NL: advance to the next line
else:
return 0
# Retrieve Background data if transparency is required
if self.transparency: # in case of transpareny, the frame buffer content is needed
if bg_buf is None: # buffer allocation needed?
if len(self.bg_buf) < pix_count * 3:
del(self.bg_buf)
gc.collect()
self.bg_buf = bytearray(pix_count * 3) # Make it bigger
bg_buf = self.bg_buf
self.setXY(self.text_x, self.text_y, self.text_x + dcols - 1, self.text_y + rows - 1) # set area
TFT_io.tft_read_cmd_data_AS(0x2e, bg_buf, pix_count * 3) # read background data
else:
bg_buf = 0 # dummy assignment, since None is not accepted
# Set XY range & print char
self.setXY(self.text_x, self.text_y, self.text_x + dcols - 1, self.text_y + rows - 1) # set area
TFT_io.displaySCR_charbitmap(addressof(fmv), pix_count, self.text_color, bg_buf) # display char!
#advance pointer
self.text_x += (cols + self.text_gap)
return cols + self.text_gap
def show(self):
tft = self.tft
width = self.width
dx = 5
x0 = self.x0
x1 = self.x1
y0 = self.y0
y1 = self.y1
height = y1 - y0
if self.divisions > 0:
dy = height / (self.divisions) # Tick marks
for tick in range(self.divisions + 1):
ypos = int(y0 + dy * tick)
tft.draw_hline(x0, ypos, dx, self.fgcolor)
tft.draw_hline(x1 - dx, ypos, dx, self.fgcolor)
if self.legends is not None and self.font is not None: # Legends
if len(self.legends) <= 1:
dy = 0
else:
dy = height / (len(self.legends) - 1)
yl = self.y1 # Start at bottom
for legend in self.legends:
print_centered(tft, int(self.x0 + self.width / 2), int(yl),
legend, self.fontcolor, self.font)
yl -= dy
if self.ptr_y is not None: # Restore background if it was saved
tft.setXY(x0, self.ptr_y, x1, self.ptr_y)
TFT_io.tft_write_data_AS(self.ptrbuf, self.ptrbytes)
self.ptr_y = int(self.y1 -
self._value * height) # y position of slider
tft.setXY(x0, self.ptr_y, x1, self.ptr_y) # Read background
TFT_io.tft_read_cmd_data_AS(0x2e, self.ptrbuf, self.ptrbytes)
tft.draw_hline(x0, self.ptr_y, width,
self.pointercolor) # Draw pointer
def save_background(self, tft): # Read background under slide
if self.slide_y is not None:
tft.setXY(*self.slide_coords())
TFT_io.tft_read_cmd_data_AS(0x2e, self.slidebuf, self.slidebytes)
