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=begin
pac-normalize.rb - rcairo sample script with #scale and #translate.
Original: pac.rb in http://www.artima.com/rubycs/articles/pdf_writer3.html
=end
top = File.expand_path(File.join(File.dirname(__FILE__), ".."))
$LOAD_PATH.unshift File.join(top, "ext", "cairo")
$LOAD_PATH.unshift File.join(top, "lib")
require "cairo"
def pac(surface, width, height)
cr = Cairo::Context.new(surface)
# NOTE: You may need to set line width when use Cairo::Context#scale
cr.set_line_width(cr.line_width / [width, height].max)
cr.scale(width, height)
cr.save do
cr.set_source_color(:black)
cr.rectangle(0, 0, 1, 1)
cr.fill
end
# Wall
wall_width = 0.89
wall_height = 0.03
wall_space = 0.5
wall_x = 0.02
wall1_y = 1 - 0.86
wall2_y = wall1_y + wall_space
wall_radius = 0.01
cr.set_source_color(:magenta)
cr.rounded_rectangle(wall_x, wall1_y, wall_width, wall_height, wall_radius)
cr.fill
cr.set_source_color(:cyan)
cr.rounded_rectangle(wall_x, wall1_y, wall_width, wall_height, wall_radius)
cr.stroke
cr.set_source_color(:magenta)
cr.rounded_rectangle(wall_x, wall2_y, wall_width, wall_height, wall_radius)
cr.fill
cr.set_source_color(:cyan)
cr.rounded_rectangle(wall_x, wall2_y, wall_width, wall_height, wall_radius)
cr.stroke
# Body
body_x = 0.17
body_y = 1 - 0.58
body_width = 0.23
body_height = 0.33
cr.save do
cr.translate(body_x, body_y)
cr.set_source_color(:yellow)
cr.scale(body_width, body_height)
cr.arc(0, 0, 0.5, 30 * (Math::PI / 180), 330 * (Math::PI / 180))
cr.line_to(0, 0)
cr.close_path
cr.fill
end
# Dot
dot_width = 0.02
dot_height = 0.03
small_dot_width = 0.01
small_dot_height = 0.015
dot_x = 0.29
dot_y = 1 - 0.58
dot_step = 0.05
cr.save do
cr.set_source_color(:yellow)
cr.save do
cr.translate(dot_x, dot_y)
cr.scale(dot_width, dot_height)
cr.circle(0, 0, 1).fill
end
4.times do |i|
cr.save do
cr.translate(dot_x + dot_step * (i + 1), dot_y)
cr.scale(small_dot_width, small_dot_height)
cr.circle(0, 0, 1).fill
end
end
end
# Ghost
ghost_x = 0.59
ghost_x_step = 0.03
ghost_y = 1 - 0.42
ghost_y_step = 0.04
ghost_width = 0.18
ghost_height = 0.29
ghost_radius= 0.08
cr.move_to(ghost_x, ghost_y)
cr.line_to(ghost_x, ghost_y - ghost_height)
cr.curve_to(ghost_x + ghost_width / 3.0,
ghost_y - ghost_height - ghost_radius,
ghost_x + ghost_width * (2.0 / 3.0),
ghost_y - ghost_height - ghost_radius,
ghost_x + ghost_width,
ghost_y - ghost_height)
cr.line_to(ghost_x + ghost_width, ghost_y)
i = 0
(ghost_x + ghost_width).step(ghost_x, -ghost_x_step) do |x|
cr.line_to(x, ghost_y + -ghost_y_step * (i % 2))
i += 1
end
cr.close_path
cr.set_source_color(:blue)
cr.fill_preserve
cr.set_source_color(:cyan)
cr.stroke
# Ghost Eyes
eye_x = 0.62
eye_y = 1 - 0.63
eye_space = 0.06
white_eye_width = 0.03
white_eye_height = 0.04
black_eye_width = 0.01
black_eye_height = 0.02
cr.set_source_color(:white)
cr.rectangle(eye_x, eye_y - white_eye_height,
white_eye_width, white_eye_height)
cr.fill
cr.rectangle(eye_x + eye_space, eye_y - white_eye_height,
white_eye_width, white_eye_height)
cr.fill
cr.set_source_color(:black)
cr.rectangle(eye_x, eye_y - black_eye_height,
black_eye_width, black_eye_height)
cr.fill
cr.rectangle(eye_x + eye_space, eye_y - black_eye_height,
black_eye_width, black_eye_height)
cr.fill
cr.show_page
end
paper = Cairo::Paper.parse(:a4_landscape)
size_in_points = paper.size("pt")
Cairo::ImageSurface.new(*size_in_points) do |surface|
cr = pac(surface, *size_in_points)
cr.target.write_to_png("pac-normalize.png")
end
scalable_surface_output = Proc.new do |surface_class_name, suffix|
if Cairo.const_defined?(surface_class_name)
surface_class = Cairo.const_get(surface_class_name)
surface_class.new("pac-normalize.#{suffix}", paper) do |surface|
pac(surface, *size_in_points)
end
else
puts("#{surface_class_name} isn't supported.")
end
end
scalable_surface_output.call("PSSurface", "ps")
scalable_surface_output.call("PDFSurface", "pdf")
scalable_surface_output.call("SVGSurface", "svg")
|
