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# triangle.rb
module Ruby2D
class Triangle
attr_accessor :x1, :y1, :c1,
:x2, :y2, :c2,
:x3, :y3, :c3
attr_reader :color, :type_id
def initialize(x1=50, y1=0, x2=100, y2=100, x3=0, y3=100, c='white')
@type_id = 1
@x1, @y1 = x1, y1
@x2, @y2 = x2, y2
@x3, @y3 = x3, y3
@color = c
update_color(c)
add
end
def color=(c)
update_color(c)
@color = c
end
def add
if Module.const_defined? :DSL
Application.add(self)
end
end
def remove
if Module.const_defined? :DSL
Application.remove(self)
end
end
private
def update_color(c)
# If a valid color, use it for each vertex
if Color.is_valid? c
@c1 = Color.new(c)
@c2 = Color.new(c)
@c3 = Color.new(c)
elsif c.class == Array && c.length < 3
raise Error, "Triangles require 3 colors, one for each vertex. Only " <<
"#{c.length} were given."
# If a valid array of colors, assign them to each vertex, respectively
elsif c.all? { |el| Color.is_valid? el }
@c1 = Color.new(c[0])
@c2 = Color.new(c[1])
@c3 = Color.new(c[2])
else
raise Error, "Not a valid color for #{self.class}"
end
end
end
end
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