ruby-tioga 1.14-1 / usr / lib / ruby / vendor_ruby / Tioga / Using_Paths.rb

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#  Using_Paths.rb

module Tioga

# These are the methods and attributes related to using previously created paths in PDF graphics operations.  See also Tutorial::Tutorial::SimpleFigure.

class Using_Paths < Doc < FigureMaker

# :call-seq:
#               stroke_color                                     
#               stroke_color = a_color
#
# Defines the color to use for painting by #stroke operations.
   def stroke_color
   end
   
# :call-seq:
#               line_color                                     
#               line_color = a_color
#
# Alias for stroke_color.
   def line_color
   end
   
# :call-seq:
#               fill_color                                     
#               fill_color = a_color
#
# Defines the color to use for painting by #fill and other non-stroke graphics operations.
   def fill_color
   end
   

# :call-seq:
#               stroke                         
#                   
# Paints a line along the current path. The stroked line follows each
# straight or curved segment in the path, centered on the segment with sides parallel
# to it. Each of the path's subpaths is treated separately. 
#
# The results of the stroke operator depend on the current settings of various parameters
# in the graphics state. 
# * The width of the stroked line is determined by the current line_width attribute.
# * The color of the line is determined by the current stroke_color attribute.
# * The line can be painted either solid or with a dash pattern, as specified by the
#   current line_type attribute.
# * If a subpath is open, the unconnected ends are treated according to the current
#   line_cap attribute, which may be <tt>LINE_CAP_BUTT</tt>, <tt>LINE_CAP_ROUND</tt>, or <tt>LINE_CAP_SQUARE</tt>.
# * Wherever two consecutive segments are connected, the joint between them is
#   treated according to the current line_join attribute, which may be <tt>LINE_JOIN_MITER</tt>,
#   <tt>LINE_JOIN_ROUND</tt>, or <tt>LINE_JOIN_BEVEL</tt>.  Mitered joins are also subject to the
#   current miter_limit setting.
# <b>NOTE</b>: Points at which unconnected segments happen
# to meet or intersect receive no special treatment. In particular, connecting the
# ends of a subpath with an explicit add_point_to_path operator rather than with
# close_path may result in a messy corner, because line caps will be applied
# instead of a line join.
#
# If a subpath is degenerate (consists of a single-point closed path or of two or
# more points at the same coordinates), the stroke operator paints it only if round line
# caps have been specified, producing a filled circle centered at the single point. If
# butt or projecting square line caps have been specified, stroke produces no output,
# because the orientation of the caps would be indeterminate.  A single-point open subpath
# (specified by a trailing move_to_point operator) produces no output.
   def stroke
   end

# :call-seq:
#               close_and_stroke                         
#                   
# Close and #stroke the current path.
   def close_and_stroke
   end

# :call-seq:
#               fill                         
#                   
# Fill the path, using the nonzero winding number rule to determine the region to fill.
# Any subpaths that are open are implicitly closed before being filled. The nonzero
# winding number rule determines whether a given point is inside a path by conceptually
# drawing a ray from that point to infinity in any direction and then examining the
# places where a segment of the path crosses the ray. Starting with a count of 0, the
# rule adds 1 each time a path segment crosses the ray from left to right and subtracts
# 1 each time a segment crosses from right to left. After counting all the crossings,
# if the result is 0 then the point is outside the path; otherwise it is inside.
#
# For simple convex paths, the nonzero winding number rule defines the inside and
# outside as one would intuitively expect. The more interesting cases are those
# involving complex or self-intersecting paths. For a path consisting of a five-pointed
# star, drawn with five connected straight line segments intersecting each other, the
# rule considers the inside to be the entire area enclosed by the star, including the
# pentagon in the center. For a path composed of nested squares, the area enclosed by
# both is considered to be inside, provided that both squares are drawn in the same direction.
# If the squares are drawn in opposite directions, only the area between them is inside,
# according to the nonzero winding number rule.  See also #eofill.
#
# link:images/Fill_Rules.png
    def fill
    end

# :call-seq:
#               eofill                         
#                   
# Fill the path, using the even-odd rule to determine the region to fill. The even-odd
# rule determines the insideness of a point by drawing a ray from that point in any
# direction and simply counting the number of path segments that cross the ray,
# regardless of direction. If this number is odd, the point is inside; if even,
# the point is outside. This yields the same results as the nonzero winding number
# rule for paths with simple shapes, but produces different results for more complex
# shapes.  See also #fill.
    def eofill
    end

# :call-seq:
#               fill_and_stroke                         
#                   
# Fill and then stroke the path, using the nonzero winding number rule to determine
# the region to fill (see #fill). This produces the same result as constructing two identical
# path objects, painting the first with #fill and the second with #stroke. Note, however, that
# the filling and stroking portions of the operation consult different values of
# several graphics state parameters, such as the current color.
    def fill_and_stroke
    end
    
# :call-seq:
#               eofill_and_stroke                         
#                   
# Fill and then stroke the path, using the even-odd rule to determine the region to fill (see #eofill).
    def eofill_and_stroke
    end
   
# :call-seq:
#               close_fill_and_stroke                         
#                   
# Close, fill, and then stroke the path, using the nonzero winding number rule to
# determine the region to fill (see #fill).
    def close_fill_and_stroke
    end
    
# :call-seq:
#               close_eofill_and_stroke                         
#                   
# Close, fill, and then stroke the path, using the even-odd rule to determine the region to fill.
    def close_eofill_and_stroke
    end
    
# :call-seq:
#               clip                         
#                   
# Sets clipping path using the winding number rule (see #fill for description).
    def clip
    end

# :call-seq:
#               eoclip                         
#                   
# Sets clipping path using the even-odd rule (see #eofill for description).
    def eoclip
    end
    


end # class
end # module Tioga

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