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require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(400, 150) { |info| info.background_color = 'white' }
gc = Magick::Draw.new
gc.stroke('black').stroke_width(15)
gc.fill_opacity(0)
gc.stroke_linecap('butt')
# Draw lines with miter join
gc.stroke_linejoin('miter')
gc.polyline(25, 100, 75, 25, 125, 100)
# Draw lines with round join
gc.stroke_linejoin('round')
gc.polyline(150, 100, 200, 25, 250, 100)
# Draw lines with bevel join
gc.stroke_linejoin('bevel')
gc.polyline(275, 100, 325, 25, 375, 100)
# Show line endpoints in pink
gc.fill('lightpink').fill_opacity(0)
gc.stroke('lightpink').stroke_width(2)
gc.stroke_linejoin('miter')
gc.polyline(25, 100, 75, 25, 125, 100)
gc.polyline(150, 100, 200, 25, 250, 100)
gc.polyline(275, 100, 325, 25, 375, 100)
gc.fill_opacity(1)
gc.circle(75, 25, 76, 26)
gc.circle(200, 25, 201, 26)
gc.circle(325, 25, 326, 26)
# Annotate
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.pointsize(14)
gc.font_weight(Magick::BoldWeight)
gc.text(35, 120, "\"'miter' join\"")
gc.text(160, 120, "\"'round' join\"")
gc.text(280, 120, "\"'bevel' join\"")
gc.draw(imgl)
imgl.write('stroke_linejoin.gif')
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