drawzero

Draw Zero

A zero-boilerplate canvas drawing framework for Python 3, based on Pygame.

Some examples

Here's some neat stuff you can do:

# import all
from drawzero import *

# simple shapes
fill('#12bbae')
line('red', (400, 400), (800, 800))
circle('yellow', (500, 560), 200)
filled_circle('brown', (500, 500), 20)
text('red', 'Hello, world!', (300, 200), 72)
rect('blue', (200, 600), 100, 100)
filled_rect('orange', (400, 600), 100, 100)
polygon('white', [(20, 200), (100, 240), (40, 160)])
filled_polygon('burlywood', 200, 400, 130, 304, 20, 342, 20, 458, 130, 496, )

Animation

Animations are also straightforward:

from drawzero import *
from math import sin, cos, pi

earth_orbit = 400
earth_radius = 30
earth_rot_step = 2 * pi / 360
moon_orbit = 100
moon_radius = 10
moon_rot_step = 2 * pi / 60

i = 0
while True:
    i += 1
    e_x = 500 + earth_orbit * cos(earth_rot_step * i)
    e_y = 500 + earth_orbit * sin(earth_rot_step * i)
    m_x = e_x + moon_orbit * cos(moon_rot_step * i)
    m_y = e_y + moon_orbit * sin(moon_rot_step * i)

    clear()
    filled_circle(C.red, (500, 500), 100)
    filled_circle(C.blue, (e_x, e_y), earth_radius)
    filled_circle(C.yellow, (m_x, m_y), moon_radius)
    tick()

Point class which acts like 2-d vector and Turtle both

from drawzero import *

# just coordinates
A = Pt(100, 100)
B = Pt(300, 150)
line(C.red, A, B)

# A point which acts as 2-d vector and as a Turtle
# Pt(x=0.0, y=0.0, *, heading=0.0)
#
# Provides (for a, b — points, k number):
#   * arithmetic
#     a+b — vector addition
#     a-b — vector subtraction
#     k*a and a*k — multiplication with scalar
#     abs  — absolute value of a
#     +a, -a

# arithmetic
A = Pt(100, 200)
dx = Pt(50, 5)
for i in range(10):
    filled_circle(C.blue, A + dx * i, radius=10)

#   * turtle-style movement
#     forward — Move the point forward by the specified distance.
#     backward — Move the point backward by distance.
#     right — Turn point right by angle degrees.
#     left — Turn point left by angle degrees.
#     goto — Move point to an absolute position.
#     rotate_around — Rotate around given point by angle degrees.
#     move_towards — Move towards the given point by the specified distance.
#     reset, home — Move point to the origin - coordinates (0,0), set heading=0
#     setx — Set the point's first coordinate to x
#     sety — Set the point's second coordinate to y
#     setheading — Set the point's heading

A = Pt(100, 300)
B = Pt(1000, 400)
for i in range(10):
    filled_circle(C.green2, A, radius=10)
    A.move_towards(50, B)

A = Pt(100, 400)
for i in range(10):
    filled_circle(C.magenta, A, radius=10)
    A.left(10).forward(30)

#   * information
#     position — Return the point's current location (x,y), as a tuple.
#     x, xcor — Return the point's x coordinate.
#     y, ycor — Return the point's y coordinate
#     heading — Return the point's heading
#     distance — Return the distance between points
#     towards — Return the angle towards point
#   * deep copy
#     copy — a clone of point

Transparency

Transparency is also straightforward via alpha parameter or RGBA color:

from drawzero import *

clear()
fill(C.black)

filled_circle('red', (100, 100), 20)
filled_circle('blue', (100, 110), 22, alpha=100)  # <-- alpha
circle('red', (100, 100), 50, line_width=10)
circle((0, 255, 0, 50), (100, 110), 50, line_width=10)  # <-- RGBA
...

Full code for transparency and line width example

from drawzero import *

clear()
fill(C.black)

filled_circle('red', (100, 100), 20)
filled_circle('blue', (100, 110), 22, alpha=100)
circle('red', (100, 100), 50, line_width=10)
circle((0, 255, 0, 50), (100, 110), 50, line_width=10)
filled_rect(C.aquamarine, (200, 100), 100, 40)
filled_rect(C.darkmagenta, (210, 110), 100, 40, alpha=80)
rect(C.darkgoldenrod, (180, 90), 200, 80, line_width=10)
rect(C.hotpink, (190, 90), 200, 90, alpha=180, line_width=10)
  
line('red', 600, 400, 600, 990)
image('cat.png', (500, 500))
image('cat.png', (500, 800), width=200, alpha=128)
image('cat.png', (550, 850), width=200, alpha=128)
  
polygon('yellow', [(20, 300), (100, 340), (40, 260)], line_width=20)
polygon((0, 0, 255, 200), [(20, 300), (100, 340), (40, 260)], line_width=15)
polygon('red', [(20, 300), (100, 340), (40, 260)])
  
filled_polygon('burlywood', 200, 600, 130, 504, 20, 542, 20, 658, 130, 696)
filled_polygon(C.hotpink, 200, 700, 130, 604, 20, 642, 20, 758, 130, 796, alpha=100)
  
line(C.green, (700, 100), (800, 200))
line(C.green, (710, 100), (810, 200), line_width=5)
line(C.red, (820, 100), (720, 200), line_width=10, alpha=50)
line(C.blue, (830, 100), (730, 200), line_width=10, alpha=128)

Color gradients

from drawzero import *


scale1 = Gradient([C.black, C.white], 0, 1000)
for x in range(0, 1000, 10):
    filled_rect(scale1(x), (x, 0), 10, 100)
text(C.white, 'scale1 = Gradient([C.black, C.white], 0, 1000)', (50, 100), 48, '<^')

scale2 = Gradient([C.green, C.yellow, C.magenta, C.red], 0, 1000)
for x in range(0, 1000, 10):
    filled_rect(scale2(x), (x, 200), 10, 100)
text(C.white, 'scale2 = Gradient([C.green, C.yellow, C.magenta, C.red], 0, 1000)', (50, 300), 32, '<^')

scale3 = Gradient([C.white, C.black, C.red, C.black, C.white], 200, 800)
for x in range(0, 1000, 10):
    filled_rect(scale3(x), (x, 400), 10, 100)
text(C.white, 'scale3 = Gradient([C.white, C.black, C.red, C.black, C.white], 200, 800)', (50, 500), 32, '<^')

Keyboard and mouse events

Process keyboard events in two ways: check if key is pressed via get_keys_pressed() or run throw keysdown or keysup events:

from drawzero import *

upper_text = 'Typed: '
SIZE = 20
x = y = 500 - SIZE // 2

while True:
    # Mouse buttons events
    if mousebuttonsdown:
        x, y = mousebuttonsdown[0].pos
    # Keys which are still pressed
    keys = get_keys_pressed()
    if keys[K.UP] or keys[K.w]:
        y -= 5
    if keys[K.DOWN] or keys[K.s]:
        y += 5
    if keys[K.LEFT] or keys[K.a]:
        x -= 5
    if keys[K.RIGHT] or keys[K.d]:
        x += 5
    # Keyboard events
    for ev in keysdown:
        if ev.unicode:
            upper_text += ev.unicode

    # Redraw everything
    clear()
    filled_rect(C.red, x, y, SIZE, SIZE)
    text(C.white, upper_text, (100, 5))
    filled_circle(C.yellow, mouse_pos(), 3)
    tick()

Installation

In a Terminal window, type:

pip install drawzero --upgrade --user

Or run the following program:

import os, sys
python = sys.executable
user = '--user' if 'venv' not in python and 'virtualenvs' not in python else ''
cmd = f'"{python}" -m pip install drawzero --upgrade {user}'
os.system(cmd)
from drawzero import *

Contributing