Module: MemeCaptain::Draw

Defined in:
lib/meme_captain/draw.rb

Overview

Mix-in for Magick::Draw

Instance Method Summary collapse

Instance Method Details

#calc_pointsize(width, height, text, min_pointsize) ⇒ Object

Calculate the largest pointsize for text that will be in a width x height box.

Return [pointsize, metrics] where pointsize is the largest pointsize and metrics is the RMagick multiline type metrics of the best fit.



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# File 'lib/meme_captain/draw.rb', line 11

def calc_pointsize(width, height, text, min_pointsize)
  current_pointsize = min_pointsize

  metrics = nil

  loop {
    self.pointsize = current_pointsize
    last_metrics = metrics
    metrics = get_multiline_type_metrics(text)

    if metrics.width + stroke_padding > width or
      metrics.height + stroke_padding > height
      if current_pointsize > min_pointsize
        current_pointsize -= 1
        metrics = last_metrics
      end
      break
    else
      current_pointsize += 1
    end
  }

  [current_pointsize, metrics]
end

#stroke_padding ⇒ Object

Return the number of pixels of padding to account for this object’s stroke width.



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# File 'lib/meme_captain/draw.rb', line 38

def stroke_padding
  # Each side of the text needs stroke_width / 2 pixels of padding
  # because half of the stroke goes inside the text and half goes
  # outside. The / 2 and * 2 (each side) cancel.
  @stroke_width.to_i
end

#stroke_width=(stroke_width) ⇒ Object

Override and set instance variable because there is apparently no way to get the value of a Draw’s current stroke width.



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# File 'lib/meme_captain/draw.rb', line 47

def stroke_width=(stroke_width)
  @stroke_width = stroke_width
  super
end