class Demo::CairoImagePattern

Public Class Methods

new() click to toggle source
Calls superclass method
# File gtk2/sample/gtk-demo/cairo-image-pattern.rb, line 15
def initialize
  super('cairo image pattern')
end

Public Instance Methods

draw(cr) click to toggle source
# File gtk2/sample/gtk-demo/cairo-image-pattern.rb, line 19
def draw(cr)
  image = Cairo::ImageSurface.from_png("ruby-gnome2-logo.png")
  
  pattern = Cairo::SurfacePattern.new(image)
  pattern.set_extend(Cairo::EXTEND_REPEAT)
  
  cr.translate(0.5, 0.5)
  cr.rotate(Math::PI / 4)
  cr.scale(1 / Math.sqrt(2), 1 / Math.sqrt(2))
  cr.translate(-0.5, -0.5)
  
  matrix = Cairo::Matrix.scale(image.width * 5, image.height * 5)
  pattern.set_matrix(matrix)
  
  cr.set_source(pattern)
  
  cr.rectangle(0, 0, 1.0, 1.0)
  cr.fill
end