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module Rubyvis
module SvgScene
def self.line(scenes)
#e=scenes._g.elements[1]
e=scenes._g.get_element(1)
return e if (scenes.size < 2)
s = scenes[0]
# segmented */
return self.line_segment(scenes) if (s.segmented)
#/* visible */
return e if (!s.visible)
fill = s.fill_style
stroke = s.stroke_style
return e if (fill.opacity==0.0 and stroke.opacity==0.0)
#/* points */
d = "M#{s.left},#{s.top}"
if (scenes.size > 2 and (['basis', 'cardinal', 'monotone'].include? s.interpolate))
case (s.interpolate)
when "basis"
d = d+ curve_basis(scenes)
when "cardinal"
d = d+curve_cardinal(scenes, s.tension)
when "monotone"
d = d+curve_monotone(scenes)
end
else
(1...scenes.size).each {|i|
d+= path_segment(scenes[i-1],scenes[i])
}
end
e = SvgScene.expect(e, "path", {
"shape-rendering"=> s.antialias ? nil : "crispEdges",
"pointer-events"=> s.events,
"cursor"=> s.cursor,
"d"=> d,
"fill"=> fill.color,
"fill-opacity"=> (fill.opacity==0.0) ? nil : fill.opacity,
"stroke"=> stroke.color,
"stroke-opacity"=> (stroke.opacity==0.0) ? nil : stroke.opacity,
"stroke-dasharray"=> s.stroke_dasharray, # strokeDasharray from Jamie Love (protovis mod)
"stroke-width"=> (stroke.opacity>0) ? s.line_width / self.scale : nil,
"stroke-linejoin"=> s.line_join
});
return SvgScene.append(e, scenes, 0);
end
def self.line_segment(scenes)
#e=scenes._g.elements[1]
e=scenes._g.get_element(1)
s = scenes[0];
paths=nil
case s.interpolate
when "basis"
paths = curve_basis_segments(scenes)
when "cardinal"
paths=curve_cardinal_segments(scenes, s.tension)
when "monotone"
paths = curve_monotone_segments(scenes)
end
(0...(scenes.size-1)).each {|i|
s1 = scenes[i]
s2 = scenes[i + 1];
#p "#{s1.top} #{s1.left} #{s1.line_width} #{s1.interpolate} #{s1.line_join}"
# visible
next if (!s1.visible or !s2.visible)
stroke = s1.stroke_style
fill = Rubyvis::Color.transparent
next if stroke.opacity==0.0
# interpolate
d=nil
if ((s1.interpolate == "linear") and (s1.line_join == "miter"))
fill = stroke
stroke = Rubyvis::Color.transparent
s0=((i-1) < 0) ? nil : scenes[i-1]
s3=((i+2) >= scenes.size) ? nil : scenes[i+2]
d = path_join(s0, s1, s2, s3)
elsif(paths)
d = paths[i]
else
d = "M#{s1.left},#{s1.top}#{path_segment(s1, s2)}"
end
e = SvgScene.expect(e, "path", {
"shape-rendering"=> s1.antialias ? nil : "crispEdges",
"pointer-events"=> s1.events,
"cursor"=> s1.cursor,
"d"=> d,
"fill"=> fill.color,
"fill-opacity"=> (fill.opacity==0.0) ? nil : fill.opacity,
"stroke"=> stroke.color,
"stroke-opacity"=> (stroke.opacity==0.0) ? nil : stroke.opacity,
"stroke-width"=> stroke.opacity>0 ? s1.line_width / self.scale : nil,
"stroke-linejoin"=> s1.line_join
});
e = SvgScene.append(e, scenes, i);
}
e
end
# Returns the path segment for the specified points. */
def self.path_segment(s1, s2)
l = 1; # sweep-flag
l = 0 if s1.interpolate=='polar-reverse'
if s1.interpolate=='polar' or s1.interpolate=='polar-reverse'
dx = s2.left - s1.left
dy = s2.top - s1.top
e = 1 - s1.eccentricity
r = Math.sqrt(dx * dx + dy * dy) / (2 * e)
if !((e<=0) or (e>1))
return "A#{r},#{r} 0 0,#{l} #{s2.left},#{s2.top}"
end
end
if s1.interpolate=="step-before"
return "V#{s2.top}H#{s2.left}"
elsif s1.interpolate=="step-after"
return "H#{s2.left}V#{s2.top}"
end
return "L#{s2.left},#{s2.top}"
end
#/** @private Line-line intersection, per Akenine-Moller 16.16.1. */
def self.line_intersect(o1, d1, o2, d2)
return o1.plus(d1.times(o2.minus(o1).dot(d2.perp()) / d1.dot(d2.perp())));
end
#/** @private Returns the miter join path for the specified points. */
def self.path_join(s0, s1, s2, s3)
#
# P1-P2 is the current line segment. V is a vector that is perpendicular to
# the line segment, and has length lineWidth / 2. ABCD forms the initial
# bounding box of the line segment (i.e., the line segment if we were to do
# no joins).
#
p1 = Rubyvis.vector(s1.left, s1.top)
p2 = Rubyvis.vector(s2.left, s2.top)
_p = p2.minus(p1)
v = _p.perp().norm()
w = v.times(s1.line_width / (2.0 * self.scale))
a = p1.plus(w)
b = p2.plus(w)
c = p2.minus(w)
d = p1.minus(w)
#/*
# * Start join. P0 is the previous line segment's start point. We define the
# * cutting plane as the average of the vector perpendicular to P0-P1, and
# * the vector perpendicular to P1-P2. This insures that the cross-section of
# * the line on the cutting plane is equal if the line-width is unchanged.
# * Note that we don't implement miter limits, so these can get wild.
# */
if (s0 and s0.visible)
v1 = p1.minus(s0.left, s0.top).perp().norm().plus(v)
d = line_intersect(p1, v1, d, _p)
a = line_intersect(p1, v1, a, _p)
end
#/* Similarly, for end join. */
if (s3 and s3.visible)
v2 = Rubyvis.vector(s3.left, s3.top).minus(p2).perp().norm().plus(v);
c = line_intersect(p2, v2, c, _p);
b = line_intersect(p2, v2, b, _p);
end
d="M#{a.x},#{a.y}L#{b.x},#{b.y} #{c.x},#{c.y} #{d.x},#{d.y}"
d
end
end
end
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