Class: Magick::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/papirus/rmagick.rb

Instance Method Summary collapse

Instance Method Details

#to_papirus(display) ⇒ Object

Send’s any image to the PAPiRus display, if it is found image is rescaled to fit the display (positioning it mid center)

Parameters:



7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/papirus/rmagick.rb', line 7

def to_papirus(display)
    # Resize to fit the screen
    resized = resize_to_fit(display.width, display.height)
    # Reduce the image to a limited number of colors for a "poster" effect, brings it donw to 4-bit 16 colors
    posterized = resized.posterize(2)
    #now, as the display expects a file with all pixels set, we need to extend the image to the display size
    #if it is smaller in either width or height or both
    if (posterize.columns != display.width or posterize.rows != display.height)
        # extent fill color
        posterized.background_color = "#FFFFFF"
        # calculate necessary translation to center image on background
        x = (posterized.columns - display.width) / 2
        y = (posterized.rows - display.height) / 2
        # now, 'extent' the image to the correct size with the image centered
        posterized = posterized.extent(display.width, display.height, x, y)
    end
    # Now, make grayscale with only 2 colors, b/w, brings it down to 1-bit 2 colors
    quantized = posterized.quantize(2, Magick::GRAYColorspace)
    #return the raw image data
    quantized.write(display.display_path){self.format='DIB'} #DIB=Device Independant Binary, as in , no headers, just raw data
end