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Demo::CairoTextAlignCenter

Constants

TEXT

Public Class Methods

new() click to toggle source
# File gtk2/sample/gtk-demo/cairo-text-align-center.rb, line 17
def initialize
  super('cairo text align center')
end

Public Instance Methods

draw(cr) click to toggle source
# File gtk2/sample/gtk-demo/cairo-text-align-center.rb, line 21
def draw(cr)
  cr.select_font_face("Sans",
                      Cairo::FONT_SLANT_NORMAL,
                      Cairo::FONT_WEIGHT_NORMAL)
  
  cr.set_font_size(0.2)
  extents = cr.text_extents(TEXT)
  x = 0.5 - (extents.width / 2 + extents.x_bearing)
  y = 0.5 - (extents.height / 2 + extents.y_bearing)
  
  cr.move_to(x, y)
  cr.show_text(TEXT)
  
  # draw helping lines
  cr.set_source_rgba(1, 0.2, 0.2, 0.6)
  cr.arc(x, y, 0.05, 0, 2 * Math::PI)
  cr.fill
  cr.move_to(0.5, 0)
  cr.rel_line_to(0, 1)
  cr.move_to(0, 0.5)
  cr.rel_line_to(1, 0)
  cr.stroke
end

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