From: Justin Bl <janthonyb1@...>
Date: 2009-08-10T01:12:16+09:00
Subject: Re: Imagemagick, Rmagick hsla problem

Tim Hunter wrote:
> Justin Bl wrote:
>> 
>> Ruby version: 1.8.6
>> ImageMagick Version: 6.5.3 Q8
>> Rmagick Version: rmagick-2.10.0-x86-mswin32
>> OS: Windows Vista
> 
> I don't think the problem is with the from_hsla method. This produces a
> nice sorta lime-green 200x200 image for me. Why don't you post a
> complete script that reproduces the problem?
> 
> irb(main):001:0> p = Magick::Pixel.from_hsla(80, 100, 50, 1)
> => red=170, green=255, blue=0, opacity=0
> irb(main):002:0> img = Magick::Image.new(200,200) {
> self.background_color = p}
> =>   200x200 DirectClass 8-bit
> irb(main):003:0> img.display
> =>   200x200 DirectClass 8-bit

Tim,
Full source code is below:

  require 'rubygems'
  require 'rvg/rvg'
  include Magick

class MyImage
def initialize (job_id, width, height)

@job_id = job_id.to_s;
@width = width.to_i;
@height = height.to_i;
@canvas = Magick::Image.new(@width, @height)
#@canvas.colorspace = HSLColorspace
@canvas.background_color = Magick::Pixel.from_hsla(80, 100, 50, 1)
#it will make the pixel but it will not make it the right color
end
def draw ()
# choose random color and put it in a pixel
#@canvas.each_pixel {|pixel, c, r|
  #ind = rand(5)
  #pixel = $colors[ind]
#}
#@canvas.pixel_color(x, y[, new_color]) -> pixel

end
def finalize (type="gif")
@canvas.write("#{@job_id}.#{type}")
end
end

x = 500
y = 500
increm = 360/5

$colors = Array.new
$colors = [
[0,100,50,1],
[72,100,50,1],
[144,100,50,1],
[216,100,50,1],
[288,100,50,1]
]
# initial array is just the h s l a values
$colors = $colors.map { |xx| Magick::Pixel.from_hsla(xx[0], xx[1], 
xx[2], x[3]) }
# convert it to array of pixels
puts $colors[0].class

img = MyImage.new("hsl_test", x, y)
img.draw()
img.finalize('png')
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