Math formula

[sakmrb]

Is there a mathematical formula the you could punch in two co-ordinates and have it find the degrees from one point to another?

In other words, if you had two XY points (100,570) and (200,400) and you want to find out what degree (0 to 360) it was from one point to the other.

Any suggestions? I'm muddling through it, but there must be an easier way.

S.

 

[kennethkawamoto]

It depends on what you mean by "degrees from one point to another". Let's say it is the angle between the horizontal line starting from point A and the line between point A and B. If the coordinate of point A is (x1, y1) and point B is (x2, y2), the angle (radian) is the arc tangent of (y2 - y1)/(x2 - x1). In Lingo it would be:
[tt]--
on findAngle x1, y1, x2, y2
x1 = float(x1)
return atan((y2 - y1)/(x2 - x1))*180/pi
end findAngle
--[/tt]
Let's try with your two points A(100, 570) and B(200, 400):
[tt]--
put findAngle(100, 570, 200, 400)
-- -59.5345
--[/tt]
So, your point B is angled about 60° below the point A.

Kenneth Kawamoto

http://www.materiaprima.co.uk