https://repl.it/BrIc/230 created by anonymous

BrIc-230.rb

# Write a function, `rec_intersection(rect1, rect2)` and returns the
# intersection of the two.
#
# Rectangles are represented as a pair of coordinate-pairs: the
# bottom-left and top-right coordinates (given in `[x, y]` notation).
#
# Hint: You can calculate the left-most x coordinate of the
# intersection by taking the maximum of the left-most x coordinate of
# each rectangle. Likewise, you can calculate the top-most y
# coordinate of the intersection by taking the minimum of the top most
# y coordinate of each rectangle.
#
# Difficulty: 4/5

def rec_intersection(rect1, rect2)
	result = nil
	conjunction_react = conjunction_react(rect1,rect2)
	if conjunction_react[0][0] < conjunction_react[1][0]
		result = conjunction_react
	end
	return result
end

def conjunction_react(rect1,rect2)
	rect = []
	if rect1[0][0] > rect2[0][0]
		p1_x = rect1[0][0]
	else
		p1_x = rect2[0][0]
	end
	if rect1[0][1] > rect2[0][1]
		p1_y = rect1[0][1]
	else
		p1_y = rect2[0][1]
	end	

	if rect1[1][0] < rect2[1][0]
		p2_x = rect1[1][0]
	else
		p2_x = rect2[1][0]
	end
	if rect1[1][1] < rect2[1][1]
		p2_y = rect1[1][1]
	else
		p2_y = rect2[1][1]
	end
	p1 = [p1_x,p1_y]
	p2 = [p2_x,p2_y]
	rect = [p1,p2]
	return rect
end

puts("\nTests for #rec_intersection")
puts("===============================================")
    puts "rec_intersection([[0, 0], [2, 1]], [[1, 0], [3, 1]]) == [[1, 0], [2, 1]]: "  + (rec_intersection([[0, 0], [2, 1]], [[1, 0], [3, 1]]) == [[1, 0], [2, 1]]).to_s
    puts "rec_intersection([[1, 1], [2, 2]], [[0, 0], [5, 5]]) == [[1, 1], [2, 2]]: "  + (rec_intersection([[1, 1], [2, 2]], [[0, 0], [5, 5]]) == [[1, 1], [2, 2]]).to_s
    puts "rec_intersection([[1, 1], [2, 2]], [[4, 4], [5, 5]]) == nil: "  + (rec_intersection([[1, 1], [2, 2]], [[4, 4], [5, 5]]) == nil).to_s
    puts "rec_intersection([[1, 1], [5, 4]], [[2, 2], [3, 5]]) == [[2, 2], [3, 4]]: "  + (rec_intersection([[1, 1], [5, 4]], [[2, 2], [3, 5]]) == [[2, 2], [3, 4]]).to_s
puts("===============================================")

BrIc-230_console_dump.txt

ruby 2.2.0p0 (2014-12-25 revision 49005)
>>> 
Tests for #rec_intersection
===============================================
rec_intersection([[0, 0], [2, 1]], [[1, 0], [3, 1]]) == [[1, 0], [2, 1]]: true
rec_intersection([[1, 1], [2, 2]], [[0, 0], [5, 5]]) == [[1, 1], [2, 2]]: true
rec_intersection([[1, 1], [2, 2]], [[4, 4], [5, 5]]) == nil: true
rec_intersection([[1, 1], [5, 4]], [[2, 2], [3, 5]]) == [[2, 2], [3, 4]]: true
===============================================
=> nil