Class: PerfectShape::Arc

Inherits:
Shape
  • Object
show all
Includes:
RectangularShape
Defined in:
lib/perfect_shape/arc.rb

Overview

Mostly ported from java.awt.geom: docs.oracle.com/javase/8/docs/api/java/awt/geom/Arc2D.html

Direct Known Subclasses

Ellipse

Constant Summary collapse

TYPES = 
[:open, :chord, :pie]

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from RectangularShape

#max_x, #max_y

Methods included from PointLocation

#min_x, #min_y

Methods inherited from Shape

#==, #bounding_box, #max_x, #max_y, #min_x, #min_y, #normalize_point

Constructor Details

#initialize(type: :open, x: 0, y: 0, width: 1, height: 1, start: 0, extent: 360, center_x: nil, center_y: nil, radius_x: nil, radius_y: nil) ⇒ Arc

Returns a new instance of Arc.



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# File 'lib/perfect_shape/arc.rb', line 36

def initialize(type: :open, x: 0, y: 0, width: 1, height: 1, start: 0, extent: 360, center_x: nil, center_y: nil, radius_x: nil, radius_y: nil)
  if center_x && center_y && radius_x && radius_y
    self.center_x = center_x
    self.center_y = center_y
    self.radius_x = radius_x
    self.radius_y = radius_y
  else
    super(x: x, y: y, width: width, height: height)
  end
  @type = type
  self.start = start
  self.extent = extent
end

Instance Attribute Details

#extent ⇒ Object

Returns the value of attribute extent.



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# File 'lib/perfect_shape/arc.rb', line 34

def extent
  @extent
end

#start ⇒ Object

Returns the value of attribute start.



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# File 'lib/perfect_shape/arc.rb', line 34

def start
  @start
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/perfect_shape/arc.rb', line 33

def type
  @type
end

Instance Method Details

#center_x ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 100

def center_x
  super || @center_x
end

#center_x=(value) ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 116

def center_x=(value)
  @center_x = BigDecimal(value.to_s)
  @x = nil
  self.radius_x = radius_x if @width
end

#center_y ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 104

def center_y
  super || @center_y
end

#center_y=(value) ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 122

def center_y=(value)
  @center_y = BigDecimal(value.to_s)
  @y = nil
  self.radius_y = radius_y if @height
end

#contain?(x_or_point, y = nil) ⇒ @code true

Checks if arc contains point (two-number Array or x, y args)

the arc, false if the point lies outside of the arc’s bounds.

Parameters:

  • x —

    The X coordinate of the point to test.

  • y (defaults to: nil) —

    The Y coordinate of the point to test.

Returns:

  • (@code true) —

    if the point lies within the bound of



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# File 'lib/perfect_shape/arc.rb', line 146

def contain?(x_or_point, y = nil)
  x, y = normalize_point(x_or_point, y)
  return unless x && y
  # Normalize the coordinates compared to the ellipse
  # having a center at 0,0 and a radius of 0.5.
  ellw = width
  return false if (ellw <= 0.0)
  normx = (x - self.x) / ellw - 0.5
  ellh = height
  return false if (ellh <= 0.0)
  normy = (y - self.y) / ellh - 0.5
  dist_sq = (normx * normx) + (normy * normy)
  return false if (dist_sq >= 0.25)
  ang_ext = self.extent.abs
  return true if (ang_ext >= 360.0)
  inarc = contain_angle?(-1*Math.radians_to_degrees(Math.atan2(normy, normx)))
  
  return inarc if type == :pie
  # CHORD and OPEN behave the same way
  if inarc
    return true if ang_ext >= 180.0
    # point must be outside the "pie triangle"
  else
    return false if ang_ext <= 180.0
    # point must be inside the "pie triangle"
  end
  
  # The point is inside the pie triangle iff it is on the same
  # side of the line connecting the ends of the arc as the center.
  angle = Math.degrees_to_radians(-start)
  x1 = Math.cos(angle)
  y1 = Math.sin(angle)
  angle += Math.degrees_to_radians(-extent)
  x2 = Math.cos(angle)
  y2 = Math.sin(angle)
  inside = (Line.relative_counterclockwise(x1, y1, x2, y2, 2*normx, 2*normy) *
                    Line.relative_counterclockwise(x1, y1, x2, y2, 0, 0) >= 0)
  inarc ? !inside : inside
end

#contain_angle?(angle) ⇒ Boolean

Determines whether or not the specified angle is within the angular extents of the arc.

Returns:

  • (Boolean) 


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# File 'lib/perfect_shape/arc.rb', line 188

def contain_angle?(angle)
  ang_ext = self.extent
  backwards = ang_ext < 0.0
  ang_ext = -ang_ext if backwards
  return true if ang_ext >= 360.0

  angle = Math.normalize_degrees(angle) - Math.normalize_degrees(start)
  angle = -angle if backwards
  angle += 360.0 if angle < 0.0

  (angle >= 0.0) && (angle < ang_ext)
end

#height ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 70

def height
  @radius_y ? @radius_y * BigDecimal('2.0') : super
end

#height=(value) ⇒ Object

Sets height, normalizing to BigDecimal



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# File 'lib/perfect_shape/arc.rb', line 95

def height=(value)
  super
  @radius_y = nil
end

#radius_x ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 108

def radius_x
  @width ? @width/BigDecimal('2.0') : @radius_x
end

#radius_x=(value) ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 128

def radius_x=(value)
  @radius_x = BigDecimal(value.to_s)
  @width = nil
end

#radius_y ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 112

def radius_y
  @height ? @height/BigDecimal('2.0') : @radius_y
end

#radius_y=(value) ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 133

def radius_y=(value)
  @radius_y = BigDecimal(value.to_s)
  @height = nil
end

#width ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 66

def width
  @radius_x ? @radius_x * BigDecimal('2.0') : super
end

#width=(value) ⇒ Object

Sets width, normalizing to BigDecimal



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# File 'lib/perfect_shape/arc.rb', line 89

def width=(value)
  super
  @radius_x = nil
end

#x ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 58

def x
  @center_x && @radius_x ? @center_x - @radius_x : super
end

#x=(value) ⇒ Object

Sets x, normalizing to BigDecimal



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# File 'lib/perfect_shape/arc.rb', line 75

def x=(value)
  super
  @center_x = nil
  self.width = width if @radius_x
end

#y ⇒ Object 



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# File 'lib/perfect_shape/arc.rb', line 62

def y
  @center_y && @radius_y ? @center_y - @radius_y : super
end

#y=(value) ⇒ Object

Sets y, normalizing to BigDecimal



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# File 'lib/perfect_shape/arc.rb', line 82

def y=(value)
  super
  @center_y = nil
  self.height = height if @radius_y
end