Class | Magick::RVG::PathData |
In: |
lib/rvg/pathdata.rb
|
Parent: | Object |
The PathData class provides an object-oriented way to produce an SVG path. Each of the methods corresponds to a path command. Construct a path by calling one or more methods. The path object can be passed as an argument to the RVG::ShapeConstructors#path method.
Construct an empty path
# File lib/rvg/pathdata.rb, line 27 27: def initialize 28: @path = '' 29: end
Add an arc command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 122 122: def arc(abs, rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y) 123: @path << sprintf("%s%g,%g %g %d %d %g,%g ", (abs ? 'A' : 'a'), rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y) 124: end
Add a closepath command. The abs argument is ignored.
# File lib/rvg/pathdata.rb, line 51 51: def closepath(abs=true) 52: @path << 'Z' # ignore `abs' 53: end
Add a curveto (cubic Bezier) command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 83 83: def curveto(abs, x1, y1, x2, y2, x, y, *coords) 84: @path << sprintf("%s%g,%g %g,%g %g,%g ", (abs ? 'C' : 'c'), x1, y1, x2, y2, x, y) 85: # "multiple sets of coordinates may be specified to draw a polybezier" 86: add_points(6, *coords) 87: end
Add a horizontal lineto command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 68 68: def hlineto(abs, x) 69: @path << sprintf("%s%g ", (abs ? 'H' : 'h'), x) 70: end
Add a lineto command. Any number of x,y coordinate pairs may be specified. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 59 59: def lineto(abs, x, y, *coords) 60: @path << sprintf("%s%g,%g ", (abs ? 'L' : 'l'), x, y) 61: # "a number of coordinate pairs may be specified to draw a polyline" 62: add_points(2, *coords) 63: end
Add a moveto command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 43 43: def moveto(abs, x, y, *coords) 44: @path << sprintf("%s%g,%g ", (abs ? 'M' : 'm'), x, y) 45: # "subsequent pairs are treated as implicit lineto commands" 46: add_points(2, *coords) 47: end
Add a quadratic Bezier curveto command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 103 103: def quadratic_curveto(abs, x1, y1, x, y, *coords) 104: @path << sprintf("%s%g,%g %g,%g ", (abs ? 'Q' : 'q'), x1, y1, x, y) 105: add_points(4, *coords) 106: end
Add a smooth curveto (cubic Bezier) command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 93 93: def smooth_curveto(abs, x2, y2, x, y, *coords) 94: @path << sprintf("%s%g,%g %g,%g ", (abs ? 'S' : 's'), x2, y2, x, y) 95: # "multiple sets of coordinates may be specified to draw a polybezier" 96: add_points(4, *coords) 97: end
Add a smooth quadratic Bezier curveto command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 112 112: def smooth_quadratic_curveto(abs, x, y, *coords) 113: @path << sprintf("%s%g,%g ", (abs ? 'T' : 't'), x, y) 114: add_points(2, *coords) 115: end
Convert the path to its string equivalent.
# File lib/rvg/pathdata.rb, line 32 32: def to_s 33: @path 34: end
Add a vertical lineto command. If abs is true the coordinates are absolute, otherwise the coordinates are relative.
# File lib/rvg/pathdata.rb, line 75 75: def vlineto(abs, y) 76: @path << sprintf("%s%g ", (abs ? 'V' : 'v'), y) 77: end
# File lib/rvg/pathdata.rb, line 15 15: def add_points(req, *coords) 16: if coords 17: if coords.length % req != 0 18: raise ArgumentError, "wrong number of coordinates specified. A multiple of #{req} required, #{req+coords.length} given." 19: end 20: coords.each {|c| @path << ("%g" % c)} 21: end 22: end