FROM python:3.6.2

RUN apt-get update \
 && apt-get install -y \
      git \
      unzip \
 && rm -rf /var/lib/apt/lists/*

#Install Ricty Diminished as a font.
WORKDIR /usr/share/fonts
ENV RICTY_DIMINISHED_VERSION 3.2.4
ADD https://github.com/mzyy94/RictyDiminished-for-Powerline/archive/$RICTY_DIMINISHED_VERSION-powerline-early-2016.zip .
RUN unzip -jo $RICTY_DIMINISHED_VERSION-powerline-early-2016.zip \
 && fc-cache -fv

#Prepare a configuration file for Matplotlib.
WORKDIR /etc
RUN echo "backend : Agg" >> matplotlibrc \
 && echo "font.family : Ricty Diminished" >> matplotlibrc

#Install Matplotlib.
WORKDIR /opt/app
ENV MATPLOTLIB_VERSION 2.0.2
RUN pip install matplotlib==$MATPLOTLIB_VERSION

#Copy the sample script using Matplotlib.
COPY plot.py .

version: '3.3'
services:
  plot:
    build: .
    environment:
      MPLCONFIGDIR: /etc
    volumes:
      - .:/opt/data-volume
    working_dir: /opt/data-volume
    entrypoint:
      - python
      - /opt/app/plot.py

from matplotlib import pyplot as plt


if __name__ == '__main__':
  labels = ['sardine', 'mackerel', 'pike', 'Oarfish']
  x = list(range(1, len(labels) + 1))
  y = [1, 3, 5, 15]

  plt.bar(x, y, align='center')
  plt.xticks(x, labels, rotation='vertical')
  plt.xlabel('Types of fish')
  plt.ylabel('strength(pt)')
  plt.tight_layout()
  plt.savefig('plot.png')

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