how to determine analog stick value for 8 direction?

leenoi · Post by **leenoi** » Tue Feb 20, 2007 1:57 pm

I want to determine analog stick value to determine 8 direction.
(S,SE,E,EN,N,NW,W,WS )

This is my code I edit from SDK 's example.
Thank you very much

Code: Select all

int main&#40;void&#41;
&#123;
	SceCtrlData pad;

	pspDebugScreenInit&#40;&#41;;
	SetupCallbacks&#40;&#41;;

	sceCtrlSetSamplingCycle&#40;0&#41;;
	sceCtrlSetSamplingMode&#40;PSP_CTRL_MODE_ANALOG&#41;;

	while&#40;!done&#41;&#123;
		pspDebugScreenSetXY&#40;0, 2&#41;;

    		sceCtrlReadBufferPositive&#40;&pad, 1&#41;; 

		printf&#40;"Analog X = %d ", pad.Lx&#41;;
		printf&#40;"Analog Y = %d \n", pad.Ly&#41;;

		if &#40;&#40;pad.Lx>=127&#41;&&&#40;pad.Ly<30&#41;&#41;
		&#123;
			printf&#40;" Go East \n"&#41;;
		&#125;else if &#40;&#40;pad.Ly<= -127&#41;&&&#40;pad.Lx<30&#41;&#41;
		&#123;
			printf&#40;" Go West \n"&#41;;
		&#125;else if &#40;&#40;pad.Ly<= -127&#41;&&&#40;pad.Lx<30&#41;&#41;
		&#123;
			printf&#40;" Go North \n"&#41;;
		&#125;else if &#40;&#40;pad.Lx>=127&#41;&&&#40;pad.Ly<120&#41;&#41;
		&#123;
			printf&#40;" Go South \n"&#41;;
		&#125;

	&#125;

	sceKernelExitGame&#40;&#41;;
	return 0;
&#125;

dot_blank · Post by **dot_blank** » Tue Feb 20, 2007 4:40 pm

Last time i remember southeast - SE composed of south + east :P
i may be wrong but ...

Code: Select all

if &#40; &#40;pad.Lx>=127&#41;&&&#40;pad.Ly<30&#41; & &#40;pad.Lx>=127&#41;&&&#40;pad.Ly<120&#41; &#41; &#123;
      print&#40;"Southeast"&#41;;
&#125;

Saotome · Post by **Saotome** » Tue Feb 20, 2007 5:51 pm

thats my solution:
(for 16 directions)

Code: Select all

	// s16 aStickR, aStickX, aStickY;

	aStickX = pad.Ly - 128;
	aStickY = pad.Lx - 128;	
	
	if &#40;getSqrRadius&#40;aStickX, aStickY&#41; > 4500&#41; &#123;
		aStickR = &#40;&#40;atan2f&#40;aStickX, aStickY&#41; + M_PI&#41; / &#40;M_PI*2&#41;&#41; * 16.0f;
	&#125; else &#123;
		aStickR = -1;		
	&#125;

getSqrRadius = x²+y² ;)

aStickR is -1 if the stick is not pulled in any direction (if the radius² is lower than 4500)

P.S.: I'm using it for a radial menu to choose 1 of 16 options ;)

dot_blank · Post by **dot_blank** » Tue Feb 20, 2007 8:38 pm

niiiicee :)

extra points for you

leenoi · Post by **leenoi** » Tue Feb 20, 2007 11:18 pm

thank you very much I will try it.

but Saotome how you check for other direction. (16 direction)

Saotome · Post by **Saotome** » Tue Feb 20, 2007 11:51 pm

dot_blank: thanks for the extra points :)

leenoi: the result in aStickR is a value from 0 to 15 (16 different values) depending on the direction you pull the stick in. if it's -1, it means that it's not pulled in any direction (relatively) depending on the threshold value (4500).

if you change the 16.0f in the code to 8.0f then you get 8 different values (0..7).

leenoi · Post by **leenoi** » Wed Feb 21, 2007 12:22 pm

Saotome wrote:dot_blank: thanks for the extra points :)

leenoi: the result in aStickR is a value from 0 to 15 (16 different values) depending on the direction you pull the stick in. if it's -1, it means that it's not pulled in any direction (relatively) depending on the threshold value (4500).

if you change the 16.0f in the code to 8.0f then you get 8 different values (0..7).

Ohh I understand now Thank you very much.