#!/usr/bin/env python
#
# BakeBit example for the basic functions of BakeBit 128x64 OLED (http://wiki.friendlyarm.com/wiki/index.php/BakeBit_-_OLED_128x64)
#
# The BakeBit connects the NanoPi NEO and BakeBit sensors.
# You can learn more about BakeBit here:  http://wiki.friendlyarm.com/BakeBit
#
# Have a question about this example?  Ask on the forums here:  http://www.friendlyarm.com/Forum/
#
'''
## License

The MIT License (MIT)

BakeBit: an open source platform for connecting BakeBit Sensors to the NanoPi NEO.
Copyright (C) 2016 FriendlyARM

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
'''

import bakebit_128_64_oled as oled
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw
import math
import time

oled.init()  #initialze SEEED OLED display

oled.clearDisplay()          #clear the screen and set start position to top left corner
oled.setNormalDisplay()      #Set display to normal mode (i.e non-inverse mode)
oled.setHorizontalMode()

width=128
height=64

# Create image buffer.
# Make sure to create image with mode '1' for 1-bit color.
image = Image.new('1', (width, height))

# Load default font.
font = ImageFont.load_default()

# Alternatively load a TTF font.  Make sure the .ttf font file is in the same directory as this python script!
# Some nice fonts to try: http://www.dafont.com/bitmap.php
# font = ImageFont.truetype('Minecraftia.ttf', 8)
# Create drawing object.
draw = ImageDraw.Draw(image)

# Define text and get total width.
text = 'Live a noble and honest life. Reviving past times in your old age will help you to enjoy your life again.'
maxwidth, unused = draw.textsize(text, font=font)

# Set animation and sine wave parameters.
amplitude = height/4
offset = height/2 - 4
velocity = -2
startpos = width

# Animate text moving in sine wave.
print('Press Ctrl-C to quit.')
pos = startpos
while True:
    try:
        # Clear image buffer by drawing a black filled box.
        draw.rectangle((0,0,width,height), outline=0, fill=0)
        # Enumerate characters and draw them offset vertically based on a sine wave.
        x = pos
        for i, c in enumerate(text):
            # Stop drawing if off the right side of screen.
            if x > width:
                break
            # Calculate width but skip drawing if off the left side of screen.
            if x < -10:
                char_width, char_height = draw.textsize(c, font=font)
                x += char_width
                continue
            # Calculate offset from sine wave.
            y = offset+math.floor(amplitude*math.sin(x/float(width)*2.0*math.pi))
            # Draw text.
            draw.text((x, y), c, font=font, fill=255)
            # Increment x position based on chacacter width.
            char_width, char_height = draw.textsize(c, font=font)
            x += char_width
        # Draw the image buffer.
        oled.drawImage(image)
        # Move position for next frame.
        pos += velocity
        # Start over if text has scrolled completely off left side of screen.
        if pos < -maxwidth:
            pos = startpos
        # Pause briefly before drawing next frame.
        time.sleep(0.1)
    except KeyboardInterrupt:
        break
    except IOError:
        print ("Error")
        break


