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Mayb123

Tue Oct 02, 2007 5:25 pm


Trig angle detection

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as the subject line says, and how, in relation to a set coordinate do i make the angle correspond to the mouse?
For example, if i have one point and then i want a line to extend through the mouse cursor, how do i use angles to draw the line directly to the cursor?


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Cervantes

Tue Oct 02, 2007 10:10 pm


RE:Trig angle detection

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Your example doesn't require that you know the angle. You could just do

Draw.Line(x,y, x + (mx - x) * lambda, y + (my - y) * lambda, black) % lambda is some positive real number. If lambda = 1, you get a line from the given point (x,y) to the mouse


But if you want to find the angle, you have to do little more than take the inverse tangent (arctan) of opposite over adjacent, plus some quadrant work.