Class: PDF::Reader::Rectangle

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/rectangle.rb

Overview

PDFs represent rectangles all over the place. They’re 4 element arrays, like this:

[A, B, C, D]

Four element arrays are yucky to work with though, so here’s a class that’s better. Initialize it with the 4 elements, and get utility functions (width, height, etc) for free.

By convention the first two elements are x1, y1, the co-ords for the bottom left corner of the rectangle. The third and fourth elements are x2, y2, the co-ords for the top left corner of the rectangle. It’s valid for the alternative corners to be used though, so we don’t assume which is which.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(x1, y1, x2, y2) ⇒ Rectangle

Returns a new instance of Rectangle.



25
26
27
 
# File 'lib/pdf/reader/rectangle.rb', line 25

def initialize(x1, y1, x2, y2)
  set_corners(x1, y1, x2, y2)
end

Instance Attribute Details

#bottom_left ⇒ Object (readonly)

Returns the value of attribute bottom_left.



23
24
25
 
# File 'lib/pdf/reader/rectangle.rb', line 23

def bottom_left
  @bottom_left
end

#bottom_right ⇒ Object (readonly)

Returns the value of attribute bottom_right.



23
24
25
 
# File 'lib/pdf/reader/rectangle.rb', line 23

def bottom_right
  @bottom_right
end

#top_left ⇒ Object (readonly)

Returns the value of attribute top_left.



23
24
25
 
# File 'lib/pdf/reader/rectangle.rb', line 23

def top_left
  @top_left
end

#top_right ⇒ Object (readonly)

Returns the value of attribute top_right.



23
24
25
 
# File 'lib/pdf/reader/rectangle.rb', line 23

def top_right
  @top_right
end

Instance Method Details

#==(other) ⇒ Object 



29
30
31
 
# File 'lib/pdf/reader/rectangle.rb', line 29

def ==(other)
  to_a == other.to_a
end

#apply_rotation(degrees) ⇒ Object 



51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
# File 'lib/pdf/reader/rectangle.rb', line 51

def apply_rotation(degrees)
  return if degrees != 90 && degrees != 180 && degrees != 270

  if degrees == 90
    new_x1 = bottom_left.x
    new_y1 = bottom_left.y - width
    new_x2 = bottom_left.x + height
    new_y2 = bottom_left.y
  elsif degrees == 180
    new_x1 = bottom_left.x - width
    new_y1 = bottom_left.y - height
    new_x2 = bottom_left.x
    new_y2 = bottom_left.y
  elsif degrees == 270
    new_x1 = bottom_left.x - height
    new_y1 = bottom_left.y
    new_x2 = bottom_left.x
    new_y2 = bottom_left.y + width
  end
  set_corners(new_x1, new_y1, new_x2, new_y2)
end

#height ⇒ Object 



33
34
35
 
# File 'lib/pdf/reader/rectangle.rb', line 33

def height
  top_right.y - bottom_right.y
end

#to_a ⇒ Object

A pdf-style 4-number array



42
43
44
45
46
47
48
49
 
# File 'lib/pdf/reader/rectangle.rb', line 42

def to_a
  [
    bottom_left.x,
    bottom_left.y,
    top_right.x,
    top_right.y,
  ]
end

#width ⇒ Object 



37
38
39
 
# File 'lib/pdf/reader/rectangle.rb', line 37

def width
  bottom_right.x - bottom_left.x
end