Class: FlickrCollage::Image

Inherits:
Object
  • Object
show all
Includes:
Methadone::CLILogging
Defined in:
lib/FlickrCollage.rb

Overview

Class for Image. Create collage and crop images

Constant Summary

IMG_WIDTH = 
800
IMG_HEIGHT = 
600

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Image

Returns a new instance of Image



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# File 'lib/FlickrCollage.rb', line 151

def initialize(opts = {})
  opts[:img_path]     ||= IMG_PATH
  opts[:img_width]    ||= IMG_WIDTH
  opts[:img_height]   ||= IMG_HEIGHT
  opts[:collage_file] ||= COLLAGE_FILE

  @img_path           = opts[:img_path]
  @img_width          = opts[:img_width]
  @img_height         = opts[:img_height]
  @collage_file       = opts[:collage_file]
  @clear_tmp          = opts[:clear_tmp]
end

Instance Attribute Details

#clear_tmp ⇒ Boolean

Delete all downloaded images

Returns:

  • (Boolean) —

    the current value of clear_tmp



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# File 'lib/FlickrCollage.rb', line 143

def clear_tmp
  @clear_tmp
end

#collage_file ⇒ String

Collage file name

Returns:

  • (String) —

    the current value of collage_file



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# File 'lib/FlickrCollage.rb', line 143

def collage_file
  @collage_file
end

#img_height ⇒ Number

Height for images crop

Returns:

  • (Number) —

    the current value of img_height



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# File 'lib/FlickrCollage.rb', line 143

def img_height
  @img_height
end

#img_path ⇒ String

Path for saving images

Returns:

  • (String) —

    the current value of img_path



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# File 'lib/FlickrCollage.rb', line 143

def img_path
  @img_path
end

#img_width ⇒ Number

Width for images crop

Returns:

  • (Number) —

    the current value of img_width



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# File 'lib/FlickrCollage.rb', line 143

def img_width
  @img_width
end

Class Method Details

.valid?(file) ⇒ true, false

Validates downloaded image

Parameters:

  • file (String) —

    file path for downloaded image

Returns:

  • (true) —

    image is valid

  • (false) —

    image is not valid



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# File 'lib/FlickrCollage.rb', line 170

def self.valid?(file)
  return false if file.nil?
  begin
    image = MiniMagick::Image.open(file)
  rescue StandardError => e
    warn "Image.valid: caught exception #{e}"
    raise e if RAISE_ERROR
  end
  image.valid?
end

Instance Method Details

#collage(opts = {}) ⇒ true, false

Creates collage from 10 images

Parameters:

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :files (Array<String>) —

    file paths for collage images

Returns:

  • (true) —

    collage created successfully

  • (false) —

    something went wrong



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# File 'lib/FlickrCollage.rb', line 214

def collage(opts = {})
  unless opts[:files].size == IMG_COUNT
    info "Not enough images for collage"
    return false
  end

  begin
    (1..4).each do |row|
      montage = MiniMagick::Tool::Montage.new
      files = montage_resize(files: opts[:files], row: row)
      files.each do |file|
        montage << file
      end
      montage << "-mode"
      montage << "Concatenate"
      montage << "-background"
      montage << "none"
      montage << "-geometry"
      montage << montage_geometry(row: row)
      montage << "-tile"
      montage << montage_tile(row: row)
      montage << montage_img_path(row: row)
      montage.call
    end
  rescue StandardError => e
    warn "Image.collage: caught exception #{e}"
    raise e if RAISE_ERROR
  end
  FileUtils.rm_rf("#{@img_path}tmp") if @clear_tmp
  true
end

#collage_simple(opts = {}) ⇒ true, false

Deprecated.

First collage implementation

Creates simple collage 5x2 from 10 images

Parameters:

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :files (Array<String>) —

    file paths for collage images

Returns:

  • (true) —

    collage created successfully

  • (false) —

    something went wrong



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# File 'lib/FlickrCollage.rb', line 285

def collage_simple(opts = {})
  unless opts[:files].size == IMG_COUNT
    info "No images for collage"
    return false
  end

  begin
    montage = MiniMagick::Tool::Montage.new
    opts[:files].each do |file|
      montage << resize(file: file)
    end
    montage << "-mode"
    montage << "Concatenate"
    montage << "-background"
    montage << "none"
    montage << "-geometry"
    montage << "#{@img_width}x#{@img_height}+0+0"
    montage << "-tile"
    montage << "5x2"
    montage << "#{@img_path}#{@collage_file}.jpg"
    puts montage.inspect.to_s
    montage.call
  rescue StandardError => e
    warn "Image.collage: caught exception #{e}"
    raise e if RAISE_ERROR
  end
  true
end

#resize(opts = {}) ⇒ String

Resize image

Parameters:

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :file (String) —

    file path for image

  • :width (Number) — default: @img_width —

    image new width

  • :height (Number) — default: @img_height —

    image new height

Returns:

  • (String) —

    file path for resized image



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# File 'lib/FlickrCollage.rb', line 189

def resize(opts = {})
  return false if opts[:file].nil?

  opts[:width]    ||= @img_width
  opts[:height]   ||= @img_height
  begin
    image = MiniMagick::Image.open(opts[:file])
    resize_to_fill(opts[:width], opts[:height], image)
    file_resize = "#{@img_path}tmp/#{File.basename(opts[:file], ".jpg")}_resize.jpg"
    image.write file_resize
    debug "Resize #{opts[:file]} to #{opts[:width]}x#{opts[:height]}"
  rescue StandardError => e
    warn "Image.resize: caught exception #{e}"
    raise e if RAISE_ERROR
  end
  file_resize
end

#resize_to_fill(width, height, img, gravity = "Center") ⇒ MiniMagick::Image

Smart image crop

Parameters:

  • width (Number) —

    image new width

  • height (Number) —

    image new height

  • img (MiniMagick::Image) —

    image

  • gravity (String) (defaults to: "Center") —

    crop around

Returns:

  • (MiniMagick::Image) —

    cropped image



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# File 'lib/FlickrCollage.rb', line 254

def resize_to_fill(width, height, img, gravity = "Center")
  cols, rows = img[:dimensions]
  img.combine_options do |cmd|
    if width != cols || height != rows
      scale_x = width / cols.to_f
      scale_y = height / rows.to_f
      if scale_x >= scale_y
        cols = (scale_x * (cols + 0.5)).round
        rows = (scale_x * (rows + 0.5)).round
        cmd.resize cols.to_s
      else
        cols = (scale_y * (cols + 0.5)).round
        rows = (scale_y * (rows + 0.5)).round
        cmd.resize "x#{rows}"
      end
    end

    cmd.gravity gravity
    cmd.background "rgba(255,255,255,0.0)"
    cmd.extent "#{width}x#{height}" if cols != width || rows != height
  end
end