"""
Purpose: Show off a few drawing commands
Author: Luther Tychonievich (lat7h)
License: Released to the public domain
"""


from PIL import Image
from PIL import ImageDraw

width = 400 # pixels
height = 300 # pixels
dimensions = (width, height)

# An image stores pixels, but does not know how to draw anything else
image = Image.new('RGB', dimensions, color='yellow')

# So we make something that can draw on that image, here called "canvas"
canvas = ImageDraw.Draw(image)

# A line, between any two points we want.
# Optionally, can give color and/or width
# Remember: (0,0) is the top-left corner; y goes down, not up
canvas.line(
    [ (10, 20), (50, 100) ],
    fill=(0,0,0),
    width=4
)

# A block of color, given by two opposite corners
# Optionally, can give fill and/or outline colors
canvas.rectangle(
    [ (110, 20), (150, 100) ],
    fill=(255,0,0),
    outline=(0,0,255),
    width=2
)

# An ellipse (or circle), given by two opposite corners of its bounding rectangle
canvas.ellipse(
    [ (120, 30), (140, 90) ],
    fill=(0,127,0),
    outline=(0,0,0),
    width=2
)

# An arc: part of an ellipse
canvas.arc(
    [ (10, 130), (50, 200) ], # rectangle it fits in
    0, 270, # starting and stoping angles, in degrees
    fill=(0,0,0),
    width=2
)

# An chord: part of an ellipse, closed and optionally filled in
canvas.chord(
    [ (110, 130), (150, 200) ], # rectangle it fits in
    0, 270, # starting and stoping angles, in degrees
    fill=(255,255,255),
    outline=(0, 127, 255),
    width=4
)

# An pie slice: part of an ellipse, closed and optionally filled in
canvas.pieslice(
    [ (210, 130), (250, 200) ], # rectangle it fits in
    0, 270, # starting and stoping angles, in degrees
    fill=(255,255,255),
    outline=(0, 127, 255),
    width=4
)

# A polygon: a list of points, connected in order and closed
canvas.polygon(
    [
        (300, 0),
        (350, 10),
        (400, 50),
        (300, 200),
        (380, 300)
    ],
    fill=(255,0,0),
    outline=(0,0,255)
)

# Text; unfortunately, its handling of fonts, etc, is computer-specific
# so I can't give examples of that which will work on all students' machines
canvas.text(
    (30, 270),
    "This is a display of example components",
    fill=(255,127,0),
)


image.show() # pops up a window
image.save('drawing_components.jpg') # creates (or overwrites) a file