Drawille for Ruby
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install drawille
Drawille can be used like the Python implementation due to the similar API. Here is one of its examples:
require 'drawille' canvas = Drawille::Canvas.new (0..1800).step(10).each do |x| canvas.set(x/10, 10 + Math.sin(x * Math::PI / 180) * 10) end puts canvas.frame
But in the end you can use it in every possible situation where you have only two colors. This means it is perfect for some stencil graffitis.
require 'drawille' require 'chunky_png' include ChunkyPNG canvas = Drawille::Canvas.new def draw canvas, img, xoffset=0 (0..img.dimension.width-1).each do |x| (0..img.dimension.height-1).each do |y| r = Color.r(img[x,y]) g = Color.g(img[x,y]) b = Color.b(img[x,y]) canvas.set(x+xoffset, y) if (r + b + g) > 100 end end end draw canvas, Image.from_file('examples/stencil-1.png') draw canvas, Image.from_file('examples/stencil-2.jpg'), 141 puts canvas.frame
With a "flipbook" you can also create animations on your terminal.
This implementation also includes a Turtle graphics API for all your beloved fractals:
require 'drawille' canvas = Drawille::Canvas.new frame = canvas.paint do move 300, 300 down 36.times do right 10 36.times do right 10 forward 8 end end end.frame puts frame
canvas = Drawille::Canvas.new canvas.paint do # Move your brush with the following commands end
forward 10 or
Moves your brush in the current direction (default is 0 which points to the right). Please note that your brush has to be set down to actually draw.
back 10 or
Moves your brush in the opposite direction. Please note that your brush has to be set down to actually draw.
right 90 or
Turn the direction of the brush by 90 degrees to the right.
left 90 or
Turn the direction of the brush by 90 degrees to the left.
Sets the brush up which means all following operations will have no effect on the canvas itself.
Sets the drush down which means that moving the brush will draw a stroke.
move 100, 100 or
mv 100, 100
Moves the brush to the position
line from: [30, 20], to: [100, 100]
A line between the two given points will be drawn. The movement to the starting point will be with an
up brush, but the former state of the brush will be restored after this line.
#set(x, y) /
#[x, y] = true
Sets the state of the given position to
true, i.e. the
#frame method will render a point at
#unset(x, y) /
#[x, y] = false
Sets the state of the given position to
false, i.e. the
#frame method will not render a point at
Toggles the state of the given position.
No point will be rendered by the
Returns newline-delimited string of the given canvas state. Braille characters are used to represent points. Please note that a single character contains 2 x 4 pixels.
c = Drawille::Canvas.new f = Drawille::FlipBook.new c.paint do move 200, 100 down 36.times do right 10 36.times do right 10 forward 8 end f.snapshot canvas end end f.play repeat: true, fps: 6
With the flip-book it is possible to create and play animations. Just draw on the canvas as usual and create a snapshot for every frame you want to be included in the animation.
Saves a snapshot of the current state of the canvas.
Will render the animation on the terminal. The method also takes an option hash with the options
As an alternative to snapshots it is possible to pass a block which will be called consecutively and should return a canvas which will be rendered as a frame in the animation or
nil to stop the animation.
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.
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