Class: Gosling::Circle

Inherits:
Actor show all
Defined in:
lib/gosling/circle.rb

Overview

Represents an Actor with a circular shape, defined by a mutable radius. The circle is rendered relative to the Circle’s center (see Transformable#center).

Constant Summary collapse

RENDER_VERTEX_COUNT =

How many vertices to use when rendering circles. More vertices means more accurate rendering at the cost of performance.

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Instance Attribute Summary collapse

Attributes inherited from Actor

#are_children_tangible, #are_children_visible, #children, #color, #is_mask, #is_tangible, #is_visible, #parent, #window

Attributes included from Transformable

#rotation

Instance Method Summary collapse

Methods inherited from Actor

#add_child, #alpha, #alpha=, #blue, #blue=, #draw, #get_actor_at, #get_actors_at, #get_global_position, #get_global_transform, #green, #green=, #has_child?, #inspect, #red, #red=, #remove_child

Methods included from Transformable

#center, #center=, #center_x, #center_x=, #center_y, #center_y=, #reset, #scale, #scale=, #scale_x, #scale_x=, #scale_y, #scale_y=, #to_matrix, transform_point, #transform_point, #translation, #translation=, untransform_point, #untransform_point, #x, #x=, #y, #y=

Constructor Details

#initialize(window) ⇒ Circle

Creates a new Circle with initial radius of zero.



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# File 'lib/gosling/circle.rb', line 21

def initialize(window)
  super(window)
  @radius = 0
end

Instance Attribute Details

#radius ⇒ Object

Returns the value of attribute radius.



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# File 'lib/gosling/circle.rb', line 16

def radius
  @radius
end

Instance Method Details

#get_point_at_angle(radians, out = nil) ⇒ Object

Returns the angle’s corresponding unit vector times this circle’s radius.

Raises:

  • (ArgumentError) 


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# File 'lib/gosling/circle.rb', line 37

def get_point_at_angle(radians, out = nil)
  raise ArgumentError.new("Expected Numeric, but received #{radians.inspect}!") unless radians.is_a?(Numeric)
  out ||= Snow::Vec3.new
  out.set(Math.cos(radians) * @radius, Math.sin(radians) * @radius, 0)
end

#is_point_in_bounds(point) ⇒ Object

Returns true if the point is inside the Circle, false otherwise.



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# File 'lib/gosling/circle.rb', line 46

def is_point_in_bounds(point)
  Collision.is_point_in_shape?(point, self)
end