# stroke_linecap.rb

    #!/usr/local/bin/ruby18 -w
    require 'RMagick'

    imgl = Magick::ImageList.new
    imgl.new_image(615, 100)

    gc = Magick::Draw.new
    gc.stroke('black').stroke_width(30)

    # Draw thick line with "butt" linecap
    gc.stroke_linecap('butt')
    gc.line(25,50, 175,50)

    # Draw thick line with "round" linecap
    gc.stroke_linecap('round')
    gc.line(225,50, 375,50)

    # Draw thick line with "square" linecap
    gc.stroke_linecap('square')
    gc.line(425,50, 575,50)

    # Show line endpoints in pink
    gc.fill('lightpink')
    gc.stroke('lightpink').stroke_width(3)
    gc.line(25,50, 175,50)
    gc.circle(25,50, 27,52).circle(175,50,177,52)
    gc.line(225,50, 375,50)
    gc.circle(225,50, 227,52).circle(375,50,377,52)
    gc.line(425,50, 575, 50)
    gc.circle(425,50, 427,52).circle(575,50,577,52)

    # Annotate
    gc.fill('black')
    gc.stroke('transparent')
    gc.pointsize(14)
    gc.font_weight(Magick::BoldWeight)

    gc.text(55,90, "\"'butt' cap\"")
    gc.text(250,90, "\"'round' cap\"")
    gc.text(450,90, "\"'square' cap\"")

    gc.draw(imgl)

    imgl.write("stroke_linecap.gif")

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