Converting gamepad thumbstick values to range

Question

I'm trying to get the value from the thumbstick with XInput, but the values are weird and I don't know how to handle them correctly.

How do I calculate so that I can read the values between -1 (thumbstick to the left/up) +1 (thumbstick to the right/down)

Similiar to XNA's Gamepad.GetState().ThumbSticks.Left.X ( -1 = to the left, +1 = to the right ).

Any ideas?

Show what code you've written that produces the "weird" values. — phonetagger, Jan 31 '13 at 19:32
float x = (float)ThumbstickLeftX / (float)32768 becomes values like = 1072693184 and such.. if I remove (float) I get nothing. — Deukalion, Jan 31 '13 at 19:39
Show your conversion code with sample input values and the resulting output values. You can edit your original question. Just tack this info on at the end. — phonetagger, Jan 31 '13 at 19:45
What are your maximum & minimum unconverted (raw) values for ThumbstickLeftX? — phonetagger, Jan 31 '13 at 19:49
They're between - 32768 to 32768, but it was just a weird calculation error... — Deukalion, Jan 31 '13 at 20:28

score 3 · Accepted Answer · answered Jan 31 '13 at 19:34

3

According to the documentation, _XINPUT_GAMEPAD.sThumbLX is a SHORT whose value lies between -32768 and 32767. If you want to convert that to a range of [-1, 1), divide the value by 32768.0.

answered Jan 31 '13 at 19:34

Kevin

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No, that'll produce a guaranteed value of zero due to integer division. Divide by 32768.0 intstead. – phonetagger Jan 31 '13 at 19:37
@phonetagger, good catch on the integer division problem. edited. – Kevin Jan 31 '13 at 19:39
I had some odd results first with this, but I guess it was a simple calculation failure that resultet in weird numbers cause I got a ten digit from calculating those without a delimiter... – Deukalion Jan 31 '13 at 20:28

Converting gamepad thumbstick values to range

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