Class: VectorSalad::StandardShapes::Oval

Inherits:

BasicShape

• Object
• BasicShape
• VectorSalad::StandardShapes::Oval

show all

Includes:

Mixins::At

Defined in:

lib/vector_salad/standard_shapes/oval.rb,
lib/vector_salad/exporters/svg_exporter.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) height readonly

  Returns the value of attribute height.

• - (Object) options inherited from BasicShape

  Returns the value of attribute options.

• - (Object) width readonly

  Returns the value of attribute width.

Instance Method Summary (collapse)

• - (Any) [](x, y) included from Mixins::At

  Set the x, y coordinates of the shape.

• - (Coords) at included from Mixins::At

  Get the x, y coordinates of the shape.

• - (Any) at=(at) included from Mixins::At

  Set the x, y coordinates of the shape directly.

• - (Oval) initialize(width, height, **options) constructor

  Create an oval.

• - (Any) move(x, y) included from Mixins::At

  Move the shape relatively.

• - (Object) to_path

  Convert the shape to a path.

• - (Object) to_svg

  Export the shape to an svg string.

new(100, 200)

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# File 'lib/vector_salad/standard_shapes/oval.rb', line 18

def initialize(width, height, **options)
  @options = options
  @width, @height = width, height
  @x, @y = 0, 0
  self
end

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# File 'lib/vector_salad/standard_shapes/oval.rb', line 11

def height
  @height
end

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# File 'lib/vector_salad/standard_shapes/oval.rb', line 11

def width
  @width
end

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# File 'lib/vector_salad/standard_shapes/oval.rb', line 26

def to_path
  # http://stackoverflow.com/a/13338311
  # c = 4 * (Math.sqrt(2) - 1) / 3
  # c = 0.5522847498307936
  #
  # http://spencermortensen.com/articles/bezier-circle/
  c = 0.551915024494
  dw = c * @width
  dh = c * @height
  Path.new(
    N.n(@x + @width, @y),
    N.c(@x + @width, @y + dh),
    N.c(@x + dw, @y + @height),
    N.n(@x, @y + @height),
    N.c(@x - dw, @y + @height),
    N.c(@x - @width, @y + dh),
    N.n(@x - @width, @y),
    N.c(@x - @width, @y - dh),
    N.c(@x - dw, @y - @height),
    N.n(@x, @y - @height),
    N.c(@x + dw, @y - @height),
    N.c(@x + @width, @y - dh),
    N.n(@x + @width, @y),
    @options
  )
end

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# File 'lib/vector_salad/exporters/svg_exporter.rb', line 111

def to_svg
  svg = "<ellipse cx=\"#{at[0]}\" cy=\"#{at[1]}\""
  svg << " rx=\"#{width}\" ry=\"#{height}\""
  svg << Exporters::SvgExporter.options(@options)
  svg << "/>"
end