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whitehat101/point_to_line.rb

Created June 16, 2017 10:18
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point_to_line / point_to_line_points
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point_to_line.rb
# point_to_line
# point: (x0, y0)
# line: ax+by+c=0
def point_to_line x0,y0, a,b,c
(a*x0+b*y0+c).abs / Math.sqrt(a**2+b**2)
end
# point: (x0, y0)
# line: between (x1, y1), (x2, y2)
def point_to_line_points x0,y0, x1,y1, x2,y2
((y2-y1)*x0-(x2-x1)*y0+x2*y1-y2*x1).abs / Math.sqrt((x2-x1)**2+(y2-y1)**2)
end
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