This library is not very useful on its own but there are a few other libraries that allow creating a canvas from an image file or saving one to an image file.
require"stumpy_core"includeStumpyCore
rainbow =Canvas.new(256, 256)
(0...255).each do |x|
(0...255).each do |y|
# RGBA.from_rgb_n(values, bit_depth) is an internal helper method# that creates an RGBA object from a rgb triplet with a given bit depth
color =RGBA.from_rgb_n(x, y, 255, 8)
rainbow[x, y] = color
endend# It is also possible to provide a background color,# the default is transparent black `RGBA.new(0, 0, 0, 0)`
white =Canvas.new(256, 256, RGBA.from_hex("#ffffff"))
# If the colors for all pixels are already known when creating the canvas,# the block syntax can be used to simplify the code:
rainbow2 =Canvas.new(256, 256) { |x, y| RGBA.from_rgb_n(x, y, 255, 8) }
checkerboard =Canvas.new(256, 256) do |x, y|
if ((x /32) + (y /32)).odd?
RGBA.from_hex("#ffffff")
elseRGBA.from_hex("#000000")
endend
spectrum =Canvas.new(361, 101) { |x, y| RGBA.from_hsl(x, 100, y) }
spectrum2 =Canvas.new(361, 101) { |x, y| RGBA.from_hsba([x, 100, y], 1) }
Thanks goes to these wonderful people (emoji key):
Leon 💻 | Ian Rash 💻 | Sam 💻 | reiswindy 📖 |
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This project follows the all-contributors specification. Contributions of any kind welcome!