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require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(250, 250, Magick::HatchFill.new('white', 'LightCyan2'))
gc = Magick::Draw.new
gc.stroke_linejoin('round')
# Draw 3 lines in 3 colors.
# Make each line 2 pixels wide.
gc.stroke('red')
gc.stroke_width(3)
gc.line(50, 50, 50, 200)
gc.stroke('blue')
gc.line(50, 200, 200, 200)
gc.stroke('green')
gc.line(200, 200, 50, 50)
# Identify the endpoints with gray circles
gc.stroke('gray50')
gc.stroke_width(1)
gc.fill_opacity(0)
gc.circle(50, 50, 53, 53)
gc.circle(50, 200, 53, 203)
gc.circle(200, 200, 203, 203)
# Annotate the endpoints
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.text(30, 40, "'50,50'")
gc.text(30, 220, "'50,200'")
gc.text(180, 220, "'200,200'")
gc.draw(imgl)
imgl.border!(1, 1, 'LightCyan2')
imgl.write('line.gif')
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