class PDF::Reader::Rectangle
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.
Attributes
bottom_left[R]
bottom_right[R]
top_left[R]
top_right[R]
Public Class Methods
from_array(arr)
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# File lib/pdf/reader/rectangle.rb, line 29 def self.from_array(arr) if arr.size != 4 raise ArgumentError, "Only 4-element Arrays can be converted to a Rectangle" end PDF::Reader::Rectangle.new( arr[0].to_f, arr[1].to_f, arr[2].to_f, arr[3].to_f, ) end
new(x1, y1, x2, y2)
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# File lib/pdf/reader/rectangle.rb, line 25 def initialize(x1, y1, x2, y2) set_corners(x1, y1, x2, y2) end
Public Instance Methods
==(other)
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# File lib/pdf/reader/rectangle.rb, line 42 def ==(other) to_a == other.to_a end
apply_rotation(degrees)
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# File lib/pdf/reader/rectangle.rb, line 69 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 || 0, new_y1 || 0, new_x2 || 0, new_y2 || 0) end
contains?(point)
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# File lib/pdf/reader/rectangle.rb, line 54 def contains?(point) point.x >= bottom_left.x && point.x <= top_right.x && point.y >= bottom_left.y && point.y <= top_right.y end
height()
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# File lib/pdf/reader/rectangle.rb, line 46 def height top_right.y - bottom_right.y end
to_a()
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A pdf-style 4-number array
# File lib/pdf/reader/rectangle.rb, line 60 def to_a [ bottom_left.x, bottom_left.y, top_right.x, top_right.y, ] end
width()
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# File lib/pdf/reader/rectangle.rb, line 50 def width bottom_right.x - bottom_left.x end
Private Instance Methods
set_corners(x1, y1, x2, y2)
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# File lib/pdf/reader/rectangle.rb, line 93 def set_corners(x1, y1, x2, y2) @bottom_left = PDF::Reader::Point.new( [x1, x2].min, [y1, y2].min, ) @bottom_right = PDF::Reader::Point.new( [x1, x2].max, [y1, y2].min, ) @top_left = PDF::Reader::Point.new( [x1, x2].min, [y1, y2].max, ) @top_right = PDF::Reader::Point.new( [x1, x2].max, [y1, y2].max, ) end