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Question by Bloodleh · Mar 11, 2014 at 04:29 PM · 2dspriteobjectdirectiondistance

[2D] Object at X distance to Y direction from point

I am making a 2D player out of multiple sprites. One of them is hand which isn't attached to the body and is only hovering. I want this hand to be at specific distance away from the torso all the time and rotating towards mouse.

So known info are:

  • Start point x1,y1 (player torso position)

  • Length a (Distance between player torso and hand)

  • Angle alpha (I have already calculated this with mouse position)

I just don't know how to calculate the end point (player hand position). I have tried using the formula:

 x2 = x1 + cos(alpha) * length
 y2 = y1 + sin(alpha) * length

but it doesn't work perfectly. The hand is rotating very fast around the torso even with small cursor movement. Like one round per 6 degrees of angle change.

What am I doing wrong? Picture to demonstrate the situation.

alt text

EDIT: Solved - Only had to convert degrees to radians!

matikkaaa.png (5.7 kB)
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Answer by stevethorne · Mar 11, 2014 at 04:40 PM

That alpha angle needs to be in radians, are you using degrees?

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avatar image Bloodleh · Mar 11, 2014 at 04:56 PM 0
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Oh dear, that was exactly it! Now I feel extremely stupid. Thank you, I have been stuck with this issue for hours now even though it was only a converting issue...

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