Class: Lipstick::Images::EmailBanner

Inherits:
Object
  • Object
show all
Defined in:
lib/lipstick/images/email_banner.rb

Overview

Creates an AAF standard email banner, with three elements, positioned as follows:

  1. AAF Logo. Vertically centered and left-aligned within the content box, and with a blank space to the right.

  2. Application title. Vertically centered, and left-aligned to the logo’s right margin.

  3. Environment string. Positioned 10 pixels below the app title, and left-aligned to the logo’s right margin.

The “box” containing these three elements is horizontally centered in the resulting image.

Text metrics work as follows, using “Alimony” as the example word:

  • (x, y) is the position of the bottom left tip of ‘A’

  • ‘ascent` is the letter height from that point (i.e. the height of ’A’)

  • ‘descent` is a negative value; the letter height below that point (i.e. the height of the ’tail’ of ‘y’)

  • ‘height` is greater than `(ascent - descent)`, making it useless for our purposes here.

For image compositing, (x, y) is the position of the top-left corner.

Instance Method Summary collapse

Constructor Details

#initialize(image:, title:, environment:, background_color:, resize_to:) ⇒ EmailBanner

Returns a new instance of EmailBanner.



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# File 'lib/lipstick/images/email_banner.rb', line 29

def initialize(image:, title:, environment:,
               background_color:, resize_to:)
  require 'rmagick'

  @title = title
  @environment = environment
  @image = image
  @background_color = background_color
  @resize_to = resize_to
end

Instance Method Details

#to_png ⇒ Object 



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# File 'lib/lipstick/images/email_banner.rb', line 40

def to_png
  bgcolor = @background_color

  canvas = Magick::ImageList.new
  canvas.new_image(WIDTH, HEIGHT) do |f|
    f.format = 'PNG'
    f.background_color = bgcolor
  end

  annotate_title(canvas)
  annotate_environment(canvas)

  canvas.composite!(, logo_x, logo_y, Magick::SrcOverCompositeOp)

  canvas.to_blob
end