NAME
trans_2d
FUNCTION
trans_2d(x0, y0, x1, y1)
NOTES
Calculate 2D transformation from (x0, y0) to (x1, y1).
INPUTS
x0, y0 - numbers specify the start point
x1, y1 - numbers specify the end point
OUTPUTS
Distance and the rotation angle.
SOURCE
function trans_2d(x0, y0, x1, y1)
local dx = x1 - x0
local dy = y1 - y0
local d2 = math.sqrt(dx * dx + dy * dy)
if (d2 ~= 0) then
local phi = 57.29577951 * math.acos(dx / d2)
if dy >= 0 then
return d2, phi
else
return d2, -phi
end
end
end