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| require 'rubygems'
require 'rmagick'
include Magick
img_filename = "example.png"
# Helper function to create new name
def new_name(img_filename, modifier = "_shadow")
chunks = img_filename.split(".")
chunks[0..-2].join(".") + modifier + ".#{chunks[-1]}"
end
# Creates drop show rectangle
def drop_shadow_rectangle(x,y,width,height)
gc = Draw.new
gc.fill_color("black")
gc.rectangle(x,y,width,height)
end
# creates frame draw object
def white_frame(x,y,width, height)
frame = Draw.new
frame.fill_opacity(0)
frame.stroke_color("white")
frame.rectangle(x,y,width,height)
end
def add_shadow(img_filename)
original = ImageList.new(img_filename)
source = original.scale(0.5)
source.write(new_name(source.filename, "_scaled"))
source = source.crop(0, 10, 160, 240)
canvas = Image.new(source.columns + 10, source.rows + 10) do
self.background_color = "transparent"
end
# Generates intermediate images
#source.write(new_name(source.filename, "_stripped"))
#canvas.write(new_name(source.filename, "_raw_canvas"))
image_shadow = Image.new(canvas.columns, canvas.rows) do
self.background_color = "transparent"
end
drop_shadow_rectangle(0, 0, source.columns, source.rows).draw(image_shadow)
blur = 1
x, y = 1, 1
image_shadow = image_shadow.shadow(x, y, blur, 1)
shadow_mask = image_shadow.shadow(x, y, blur, 1)
# Place the shadow
canvas.composite!(image_shadow, 0, 0, OverCompositeOp)
# Place the mask to soften the shadow
canvas.composite!(shadow_mask, 0, 0, CopyOpacityCompositeOp)
# Intermediate image
# canvas.write(new_name(source.filename, "_canvas_with_shadow"))
# Now place the image on the canvas
canvas.composite!(source, 1, 1, OverCompositeOp)
# And draw the white border on top of the image
white_frame(0, 0, source.columns, source.rows).draw canvas
# save the final image
canvas.write(new_name(source.filename, "_canvas_with_image"))
end
add_shadow(img_filename) |
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