Class: Metro::Easing

Inherits:
Object
  • Object
show all
Defined in:
lib/metro/animation/easing/easing.rb,
lib/metro/animation/easing/linear.rb,
lib/metro/animation/easing/ease_in.rb

Overview

An easing is a means to calculate the steps between the start and the final over an interval.

Direct Known Subclasses

CustomEasing, EaseIn, Linear

Defined Under Namespace

Classes: EaseIn, Linear

Class Method Summary collapse

Class Method Details

.calculate(start, final, interval) ⇒ Object

The calculate method is called within the ImplicitAnimation and will create an array of all the states between the start and the final value.



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# File 'lib/metro/animation/easing/easing.rb', line 13

def self.calculate(start,final,interval)
  change = final - start
  (1..interval).map { |time| calculation(time.to_f,start,change,interval) }
end

.calculation(moment, start, change, interval) ⇒ Object

The calculation method is to be overriden in the Easing subclasses. This calculation figures out the value at the current moemnt.



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# File 'lib/metro/animation/easing/easing.rb', line 22

def self.calculation(moment,start,change,interval) ; 0 ; end

.easing_for(easing) ⇒ Object

Returns the easing class based on the specified easing name.

Returns:

  • the easing class based on the specified easing name.



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# File 'lib/metro/animation/easing/easing.rb', line 34

def self.easing_for(easing)
  easing_classname = easings[easing]
  easing_classname.constantize
end

.easings ⇒ Object

A hash of all the supported easings within metro or game.



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# File 'lib/metro/animation/easing/easing.rb', line 42

def self.easings
  @easings_hash ||= HashWithIndifferentAccess.new("Metro::Easing::Linear")
end

.register(name, easing_class) ⇒ Object

Register an easing within the game system.



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# File 'lib/metro/animation/easing/easing.rb', line 27

def self.register(name,easing_class)
  easings[name] = easing_class.to_s
end