Class: VectorSalad::StandardShapes::Clip

Inherits:

BasicShape

• Object
• BasicShape
• VectorSalad::StandardShapes::Clip

show all

Includes:

VectorSalad::StandardShapes

Defined in:

lib/vector_salad/standard_shapes/clip.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) options inherited from BasicShape

  Returns the value of attribute options.

Instance Method Summary (collapse)

• - (Object) canvas

  The canvas the clipping is done on.

• - (MultiPath) initialize(operation, **options, &block) constructor

  The first path is used as the subject, subsequent paths are applied to the first using the specified operation.

• - (Object) to_path

  Convert the shape to a path.

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# File 'lib/vector_salad/standard_shapes/clip.rb', line 20

def initialize(operation, **options, &block)
  instance_eval(&block) # canvas is populated

  clipper = Clipper::Clipper.new

  i = 0
  canvas.each do |shape|
    method = i == 0 ? "subject" : "clip"
    path = shape.to_simple_path.to_a
    if path[0][0].instance_of? Array # MultiPath
      clipper.send("add_#{method}_polygons".to_sym, path)
    else # Path
      clipper.send("add_#{method}_polygon".to_sym, path)
    end
    i += 1
  end

  @path = MultiPath.new(
    *clipper.send(operation, :non_zero, :non_zero), **options
  )
end

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# File 'lib/vector_salad/standard_shapes/clip.rb', line 43

def canvas
  @canvas ||= VectorSalad::Canvas.new
end

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# File 'lib/vector_salad/standard_shapes/clip.rb', line 48

def to_path
  @path
end