Module: Box2D::ValueConversion

Defined in:
lib/box2d/value_conversion.rb

Class Method Summary collapse

Class Method Details

.copy_struct(struct_class, value) ⇒ Object 



54
55
56
57
58
 
# File 'lib/box2d/value_conversion.rb', line 54

def copy_struct(struct_class, value)
  struct_class.new.tap do |copy|
    copy.pointer.put_bytes(0, value.pointer.read_bytes(struct_class.size))
  end
end

.finite_float(value, label:) ⇒ Object 



31
32
33
34
35
36
37
38
 
# File 'lib/box2d/value_conversion.rb', line 31

def finite_float(value, label:)
  number = Float(value)
  return number if number.finite?

  raise ArgumentError, "#{label} must be finite"
rescue TypeError, ArgumentError
  raise ArgumentError, "#{label} must be a finite number"
end

.id_key(id) ⇒ Object 



60
61
62
63
64
65
66
 
# File 'lib/box2d/value_conversion.rb', line 60

def id_key(id)
  members = id.class.members
  key = Integer(id[:index1]) | (Integer(id[:generation]) << 32)
  return key unless members.include?(:world0)

  key | (Integer(id[:world0]) << 48)
end

.native_rot(angle) ⇒ Object 



15
16
17
18
19
20
21
 
# File 'lib/box2d/value_conversion.rb', line 15

def native_rot(angle)
  radians = finite_float(angle, label: "angle")
  Native::Rot.new.tap do |rotation|
    rotation[:c] = Math.cos(radians)
    rotation[:s] = Math.sin(radians)
  end
end

.native_vec2(value, label: "vector") ⇒ Object 



7
8
9
10
11
12
13
 
# File 'lib/box2d/value_conversion.rb', line 7

def native_vec2(value, label: "vector")
  x, y = pair(value, label:)
  Native::Vec2.new.tap do |vector|
    vector[:x] = finite_float(x, label: "#{label}.x")
    vector[:y] = finite_float(y, label: "#{label}.y")
  end
end

.non_negative_float(value, label:) ⇒ Object

Raises:

  • (ArgumentError) 


47
48
49
50
51
52
 
# File 'lib/box2d/value_conversion.rb', line 47

def non_negative_float(value, label:)
  number = finite_float(value, label:)
  return number if number >= 0.0

  raise ArgumentError, "#{label} must be non-negative"
end

.positive_float(value, label:) ⇒ Object

Raises:

  • (ArgumentError) 


40
41
42
43
44
45
 
# File 'lib/box2d/value_conversion.rb', line 40

def positive_float(value, label:)
  number = finite_float(value, label:)
  return number if number.positive?

  raise ArgumentError, "#{label} must be greater than zero"
end

.vec2(value) ⇒ Object 



23
24
25
26
27
28
29
 
# File 'lib/box2d/value_conversion.rb', line 23

def vec2(value)
  x = value[:x]
  y = value[:y]
  return Larb::Vec2.new(x, y) if defined?(Larb::Vec2)

  [x, y]
end