from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import time

import ST7789


MESSAGE = "Hello World! How are you today?"

# Create ST7789 LCD display class.
disp = ST7789.ST7789(
    port=0,
    cs=ST7789.BG_SPI_CS_BACK,  # BG_SPI_CS_BACK or BG_SPI_CS_FRONT
    dc=25, 
    backlight=26,               # 18 for back BG slot, 19 for front BG slot.
    spi_speed_hz=80 * 1000 * 1000
)

# Initialize display.
disp.begin()

WIDTH = disp.width
HEIGHT = disp.height


img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0))

draw = ImageDraw.Draw(img)

font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 30)

size_x, size_y = draw.textsize(MESSAGE, font)

text_x = disp.width
text_y = (80 - size_y) // 2

t_start = time.time()

while True:
    x = (time.time() - t_start) * 100
    x %= (size_x + disp.width)
    draw.rectangle((0, 0, disp.width, 80), (0, 0, 0))
    draw.text((int(text_x - x), text_y), MESSAGE, font=font, fill=(255, 255, 255))
    disp.display(img)

from PIL import Image, ImageDraw, ImageFont
import ST7789

class Console:
	def __init__(self):

		# Create ST7789 LCD display class.
		self.disp = ST7789.ST7789(
			port=0,
			cs=ST7789.BG_SPI_CS_BACK,
			dc=25, 
			backlight=26,
			spi_speed_hz=80 * 1000 * 1000
		)

		# Initialize display.
		self.disp.begin()
		self.pixel_x = self.disp.width
		self.pixel_y = self.disp.height
		self.img = Image.new('RGB', (self.pixel_x, self.pixel_y), color=(0, 0, 0))
		self.draw = ImageDraw.Draw(self.img)

		self.size_x, self.size_y = self.getFontSize()
		self.col  = self.pixel_x // self.size_x
		self.row  = self.pixel_y // self.size_y
		self.buffer = ["" for _ in range(self.row)]
		self.pos   = 0
		self.start = 0
		self.scroll = False

	def getFontSize(self,fontName=None, fontSize=None):
		if fontName is None:
			self.font = ImageFont.truetype("/usr/share/fonts/truetype/liberation2/LiberationMono-Regular.ttf",14)
		else:
			self.font = ImageFont.truetype(fontName, fontSize)
		self.size_x, self.size_y = self.draw.textsize("F", font=self.font)
		return self.size_x, self.size_y

	def print(self, msg):
		line_len  = len(msg)
		line_num  = line_len//self.col
		line_rest = line_len % self.col
		line_from = 0
		line_to   = self.col
		while line_num > 0:
			if self.scroll:
				self.start += 1
				if self.start == self.row:
					self.start = 0
			self.buffer[self.pos] = msg[line_from:line_to]
			line_from += self.col
			line_to   += self.col
			self.pos += 1
			if self.pos == self.row:
				self.pos = 0
				self.scroll = True
			line_num -= 1
		if line_rest > 0:
			if self.scroll:
				self.start += 1
				if self.start == self.row:
					self.start = 0
			self.buffer[self.pos] = msg[line_from:line_len]
			self.pos += 1
			if self.pos == self.row:
				self.pos    = 0
				self.scroll = True

		pos_y = 0
		self.draw.rectangle((0, 0, self.disp.width, self.disp.height), (0, 0, 0))
		for i in range(self.row):
			self.draw.text((0,pos_y), self.buffer[self.start], font=self.font, fill=(255, 255, 255))
			self.start += 1
			pos_y += self.size_y
			if self.start == self.row:
				self.start = 0
		self.disp.display(self.img)