zeevallin/gradient

Library for dealing with color gradients in ruby

gradient's Issues

Problem with sort

The Gradient::Map initialiser sorts the initial set of points by location, which is fine if there are no repeated locations. However, in order to correctly represent discontinuities in gradients, duplicate locations need to be handled. Consider the following simple step gradient

[0.0, black], [0.5, black], [0.5. white], [1.0, white]

If we sort this array by location with a non-stable sort, such as Ruby's, then the result may be a sawtooth

[0.0, black], [0.5, white], [0.5. black], [1.0, white]

Several solutions are possible

• implement a stable sort on top of an unstable one (see the second link above)
• check if the input is sorted, if it is then do not sort it
• forbid discontinuities in the input

(those would be in my order of preference), and probably others.

scanf is no longer bundled with Ruby 2.7.0

Hi there,

I'm using your libary to create triangle patterns and I've noticed that there seems to be an Issue with Ruby 2.7.

When I run bin/console in ruby 2.7 I'm getting the following error:

Traceback (most recent call last):
	5: from bin/console:4:in `<main>'
	4: from bin/console:4:in `require'
	3: from /home/wolle/projekte/gradient/lib/gradient.rb:8:in `<top (required)>'
	2: from /home/wolle/projekte/gradient/lib/gradient.rb:8:in `require'
	1: from /home/wolle/projekte/gradient/lib/gradient/svg.rb:1:in `<top (required)>'
/home/wolle/projekte/gradient/lib/gradient/svg.rb:1:in `require': cannot load such file -- scanf (LoadError)

scanf cannot be loaded because it was excluded as a standard libary as of version 2.7 https://rubyreferences.github.io/rubychanges/2.7.html#libraries-excluded-from-the-standard-library

Solution:

Include scanf in your gemspec

Improve: model's functions documentation

Hi, first of all, thanks for the gem!
It would be great to describe at README the functions in the models.

I want to get a color interpolation and print as background in a table, I need the hexadecimal color, i had to inspect the code to find that it could be done with color.hex

gradient = Gradient::Map.new(
      Gradient::Point.new(0, Color::RGB.new(255, 255, 255), 1.0),
      Gradient::Point.new(1, Color::RGB.new(226, 82, 82), 1.0)
    )
gradient.at(0.5).color.hex

I suggest to add this info to the readme and the other functions... it could help.