Bresenham Algorithm with Ruby

bresenham.rb

def Bresenham(x1,y1,x2,y2)
	if(x1 > x2)
		Bresenham(x2,y2,x1,y1)
		return
	end


	dx = x2 - x1
	dy = y2 - y1
	if( dy< 0 )
		slope = -1
		dy = -dy
	else
		slope = 1
	end

	incE = 2 * dy
	incNE = (2 * dy) - (2 * dx)
	d = (2 * dy) - dx
	y = y1

	for  x in x1..x2
		puts "x : #{x} , y : #{y}"

		if(d<=0)
			d += incE
			puts "increase East"
		else
			d += incNE;
			y += slope
			puts "increase NorthEast"
		end
	end
end 

Bresenham(0,0,11,3)