#!/usr/bin/ruby -w require 'RMagick' i = Magick::ImageList.new i.new_image(360, 250, Magick::HatchFill.new('LightCyan')) gc = Magick::Draw.new gc.fill_opacity(0) gc.stroke('red').stroke_width(3) # Draw ellipse gc.ellipse(180,125, 150,75, 0, 270) # Draw horizontal width line gc.stroke('gray50').stroke_width(1) gc.line(180-150, 125, 180, 125) # Draw vertical height line gc.line(180, 125-75, 180, 125) gc.fill_opacity(0) # Draw arcStart circle gc.circle(180+150, 125, 180+150+3, 125+3) # Draw arcEnd circle gc.circle(180, 125-75, 180+3, 125-75+3) # Annotate gc.fill_opacity(1) gc.circle(180,125, 183,128) gc.fill('black') gc.stroke('transparent') gc.text(187,125, "'180,125'") gc.text(253, 118, "'Start 0 degrees'") gc.text(187, 50, "'End 270 degrees'") gc.text(127, 100, "'Height=75'") gc.text(85, 140, "'Width=150'") gc.draw(i) #i.display i.write("ellipse.gif")