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Contents
#! /usr/local/bin/ruby -w
require 'RMagick'
imgl = Magick::ImageList.new
imgl.new_image(500, 300, Magick::HatchFill.new('white','lightcyan2'))
gc = Magick::Draw.new
# Draw path with quadratic bezier commands
gc.fill_opacity 0
gc.stroke 'red'
gc.stroke_width 3
gc.path "M20,150 Q120,25 220,150 T420,150"
# Annotate
# Show end points
gc.fill_opacity 1
gc.stroke 'grey50'
gc.stroke_width 1
gc.circle 20,150, 23, 153
gc.circle 220,150, 223, 153
gc.circle 420,150, 423, 153
# Show control points
gc.fill 'black'
gc.stroke 'transparent'
gc.circle 120,25, 123, 28
gc.circle 320,275, 323, 278
# Show connector lines
gc.line 20,150, 120,25
gc.line 120,25, 320,275
gc.line 320,275, 420,150
# Add labels
gc.font_weight Magick::NormalWeight
gc.font_style Magick::NormalStyle
# Add end point labels
gc.text 30,155, "'20,150'"
gc.text 230,155, "'220,150'"
gc.text 430,155, "'420,150'"
# Add control point labels
gc.text 130,30, "'120,25'"
gc.text 330,280, "'320,275'"
gc.draw imgl
imgl.border!(1,1, "lightcyan2")
#imgl.display
imgl.write "qbezierpath.gif"
Version data entries
15 entries across 15 versions & 2 rubygems