sugar_png

Description

A pure ruby high-level PNG file creation toolkit.

(If you need a low-level PNG manipulation & analysis toolkit - take a look at ZPNG)

Features

• neat syntax
• unicode text drawing support
• 16-bit color depth support

Installation

gem install sugar_png

Examples

Hello World!

  SugarPNG.new do
    text "Hello World!"
    save "out.png"
  end

Explicit image dimensions + bg color

  SugarPNG.new do
    background 'red' # or :blue, or #ffee00, or :transparent (default)
    width 100
    height 50
    text "Hello World!", :color => '#ffffff'
    save "out.png"
  end

Japanese text with rainbow borders, zoomed 4x

  SugarPNG.new do
    border 1, :red
    border 1, :green
    border 1, :blue
    text '水水水'
    zoom 4

    save "out.png"
  end

White noise

  SugarPNG.new do
    bg :black  # shortcut for 'background'
    fg :white  # ditto
    width  100
    height 100
    200.times{ pixel(rand(100),rand(100)) }

    save "out.png"
  end

Playing with transparency & 16-bit color depth

  SugarPNG.new do |img|
    img.depth = 16

    100.times do |y|
      100.times do |x|
        img[x,y] = [0,65536*x/100,0,65535*y/100] # RGBA
      end
    end

    # 'export' returns PNG image data suitable for streaming to client
    # or manually saving to a file or do whatever you want 
    @data = img.export
  end

Pixels can be set using Ranges, Enumerators & Arrays

  SugarPNG.new do |img|
    # Ranges
    img[10...50, 10..20] = :blue
    # Array + Enumerator
    img[[1,2,4,8,16,32], 0.step(50,2)] = :red
    img.zoom = 2 
  end.save("out.png")

License

Released under the MIT License. See the LICENSE file for further details.