c++ joystick dead zone circle with acceleration outside the circle until the outer circle 16-bit? \ VOGONS

c++ joystick dead zone circle with acceleration outside the circle until the outer circle 16-bit?

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First post, by superfury

Posted on 2020-04-25, 10:27

superfury Offline

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UniPCemu currently just uses a simple dead zone, drawing a square around the 0,0 coordinate, then from that square onwards to the outer edge square(which is drawn at -32768,-32768-32767,32767) it accelerates by simple multiplication the given remainder of the area to the resulting x,y, coordinate to once again use the full 16-bit range again.

Does anyone know how to accomplish this with circles? So I want a circle around 0,0 of a certain radius, then a circle around the 16-bit range radius, change everything within said radius to 0,0 , while everything outside said circle(actually from the radius and onwards) until the border of the circle being accelerated as far as the border of the circle for said angle?

Anyone knows a formula to use for this?

Author of the UniPCemu emulator.
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UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 1 of 1, by dr_st

Posted on 2020-04-25, 12:31

dr_st Online

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Sounds like a problem to solve by switching to polar coordinates. x = rcosa, y = rsina, where r is the radius and a is the angle. For r < Rthresh you would just assign r = 0. For Rthresh < r < Rmax you would do r = (Rmax)*(r-Rthresh)/(Rmax-Rthresh). Or something like that.

That's assuming you have an efficient way of computing the trigonometric functions.

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