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david92ng

Sat May 10, 2008 8:17 pm


Trigonometry with pic.rotate help

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we have one point (x,y) and we have an other point(x2,y2)

x,y is the center.
lets say x2 and y2 is some random point around the center.

now the question, i want to draw a picture at the center(x,y) and after i will use pic.rotate it so it will point to x2,y2.
To do that i somehow need the angle from the center to the other point.

i totally forgot Trigonometry which i know i need to use for this. can someone give me the formula?
thanks


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CodeMonkey2000

Sat May 10, 2008 9:49 pm


Re: Trigonometry with pic.rotate help

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Merry Christmas!

fcn getAngle(x1, y1, x2, y2 : real) : real
    /*Some code shamelessly stolen from Bored*/
    var opp := y2 - y1
    var adj := x2 - x1
    if adj = 0 then
        if y2 > y1 then
            result 90
        else
            result 270
        end if
    elsif opp >= 0 and adj > 0 then
        result arctand (opp / adj)
    elsif adj < 0 then
        result 180 + arctand (opp / adj)
    elsif opp < 0 and adj > 0 then
        result 360 + arctand (opp / adj)
    end if
end getAngle


Just pass in the coordinates of your two points.


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david92ng

Sat May 10, 2008 10:50 pm


Re: Trigonometry with pic.rotate help

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thanks. works great.