Class: Fleximage::Blank

Inherits:
Object
  • Object
show all
Includes:
Model
Defined in:
lib/fleximage/blank.rb

Overview

The Blank class allows easy creation of dynamic images for views which depends models that do not store images. For example, perhaps you want a rendering of a text label, or a comment, or some other type of data that is not inherently image based.

Your model doesn’t need to know anything about Fleximage. You can instantiate and operate on a new Fleximage::Blank object right in your view.

Usage:

Fleximage::Blank.new(size, options = {}).operate { |image| ... }

Use the following keys in the options hash:

  • color: the color the image will be. Can be a named color or a Magick::Pixel object.

Example:

# app/views/comments/show.png.flexi
Fleximage::Blank.new('400x150')).operate do |image|
  # Start with a chat bubble image as the background
  image.image_overlay('public/images/comment_bubble.png')

  # Assuming that the user model acts_as_fleximage, this will draw the users image.
  image.image_overlay(@comment.user.file_path,
    :size => '50x50',
    :alignment => :top_left,
    :offset => '10x10'
  )

  # Add the author name text
  image.text(@comment.author,
    :alignment => :top_left,
    :offset => '10x10',
    :color => 'black',
    :font_size => 24,
    :shadow => {
      :blur => 1,
      :opacity => 0.5,
    }
  )

  # Add the comment body text
  image.text(@comment.body, 
    :alignment => :top_left,
    :offset => '10x90',
    :color => color(128, 128, 128),
    :font_size => 14
  )
end

Instance Method Summary collapse

Methods included from Model

included

Constructor Details

#initialize(size, options = {}) ⇒ Blank

Returns a new instance of Blank.



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# File 'lib/fleximage/blank.rb', line 56

def initialize(size, options = {})
  width, height = Fleximage::Operator::Base.size_to_xy(size)
  
  @uploaded_image = Magick::Image.new(width, height) do
    self.colorspace = Magick::RGBColorspace
    self.depth      = 8
    self.density    = '72'
    self.format     = 'PNG'
    self.background_color = options[:color] || 'none'
  end
  
  @output_image = @uploaded_image
end