pico-epaper/display.py

import epaper
import microbmp
import time
import random
import os
import storage
import gc

epd_colormap = [
            [0x00, 0x00, 0x00], # black
            [0xff, 0xff, 0xff], # white
            [0x00, 0x90, 0x10], # green
            [0x00, 0x00, 0xee], # blue
            [0xff, 0x00, 0x00], # red
            [0xff, 0xdd, 0x00], # yellow
            [0xff, 0x77, 0x00], # orange
            ]

max_free_height = 200

def init_display():
    #print("ePaper init ", str(time.localtime()))
    epd = epaper.EPD_5in65()
    epd.fill(epd.White)
    return epd

def draw_image(epd, filename):
    global epd_colormap
    global free_x, free_y, free_width, free_height
    offset_x = 0
    offset_y = 0
    free_x = 0
    free_y = 0
    free_width = 0
    free_height = 0
    color_map = {}
    def header_callback(header):
        #print("header callback: ", str(header))
        #global epd
        global offset_x, offset_y
        global free_x, free_y, free_width, free_height
        global max_free_height
        w = header[0]
        h = header[1]
        rest_x = (epd.width - w)
        rest_y = (epd.height - h)
        free_x = 0
        free_y = max(h, epd.height - max_free_height)
        free_width = epd.width
        free_height = min(rest_y, max_free_height)
        offset_x = rest_x//2
        offset_y = max(0, rest_y - max_free_height)//2
    def pixel_callback(x, y, color):
        #global epd
        global epd_colormap
        global offset_x, offset_y
        # translate color to color index
        color_index = 0
        color_key = color[0] + color[1] << 8 + color[2] << 16
        if color_key in color_map:
            color_index = color_map[color_key]
        else:
            # search for the best color
            best_index = 0
            best_score = 1000
            for index in range(len(epd_colormap)):
                c1 = epd_colormap[index]
                c2 = color
                score = abs(c1[0] - c2[0]) + abs(c1[1] - c2[1]) + abs(c1[2] - c2[2])
                if score < best_score:
                    best_score = score
                    best_index = index
                if score < 10:
                    break
            color_index = best_index
            color_map[color_key] = color_index
        epd.pixel(offset_x + x, offset_y + y, color_index)

    #print(str(time.localtime()), " BMP ", filename, " loading")
    time_start = time.ticks_ms()
    epd.fill(epd.White)
    microbmp.MicroBMP(header_callback=header_callback, data_callback=pixel_callback).load(filename)
    time_loaded = time.ticks_ms()
    print(" time to load: ", (time_loaded - time_start) / 1000, " s")
    #print(str(time.localtime()), " BMP loaded")
    #epd.EPD_5IN65F_Display(epd.buffer)
    #print(str(time.localtime()), " ePaper printed")
    return [free_x, free_y, free_width, free_height]

def draw_pattern(epd):
    free_x = 0
    free_y = 400
    free_width = epd.width
    free_height = epd.height - free_y
    epd.fill_rect(0, 0, epd.width, free_y, random.randrange(2,7))
    return [free_x, free_y, free_width, free_height]
                
def print_text(epd, text, region, center=False):
    fnt = 8
    x = region[0]
    y = region[1]
    w = region[2]
    h = region[3]
    if center:
        x = (w - len(text)*fnt) // 2
    epd.text(text, x, y, epd.Black)

def draw_extra(epd, region, caption):
    fnt = 8
    region[0] += 5
    region[1] += 8
    if region[2] < fnt or region[3] < fnt:
        print("Not enough space for extra: ", str(region))
        return
    #epd.rect(region[0], region[1], region[2], region[3], epd.Black)
    #region[0] += random.randrange(50)
    #print_text(str(time.localtime()), region, center=True)
    if caption is not None:
        #region[1] += fnt * 2
        print_text(epd, caption, region)
        print("Caption: ", caption)
    else:
        print("No caption")