Analog Support

[framerate]

Can anyone give me a quick snippet of how to access the analog control. I checked the included controller file in the SDK and it seems that the analog is 0,0 by default.. and then has positive negative value equal to the distance you move it...

Is this correct? so just something like:

if (analogx < 0 ) { move(left);}

etc?

Thanks guys, I just thought I might as well use that stick since it's there

[nexis2600]

Actualy I think the analog stick goes from 0-255 (unsigned). So 128 is the mid point.

Also as long as you init the psp controlls to analog on, you can read the values stored when you call the psp to update input.

// Setup Input
sceCtrlSetSamplingCycle(0 );
sceCtrlSetSamplingMode(PS P_CTRL_MODE_ANALOG);

// Read Input
SceCtrlData PadInput;
sceCtrlReadBufferPositive ( &PadInput, 1 );

if( PadInput.Lx < 32 ) MoveLeft();
if( PadInput.Lx > 255 - 32 ) MoveRight();

[soccerPMN]

Oh thank you so much. I've been wondering this myself for quite some time.

[framerate]

Originally Posted by nexis2600

Actualy I think the analog stick goes from 0-255 (unsigned). So 128 is the mid point.

Also as long as you init the psp controlls to analog on, you can read the values stored when you call the psp to update input.

// Setup Input
sceCtrlSetSamplingCycle(0 );
sceCtrlSetSamplingMode(PS P_CTRL_MODE_ANALOG);

// Read Input
SceCtrlData PadInput;
sceCtrlReadBufferPositive ( &PadInput, 1 );

if( PadInput.Lx < 32 ) MoveLeft();
if( PadInput.Lx > 255 - 32 ) MoveRight();

Ahh that's the ticket..

But why is it < 32 and > 233?

Wouldn't it be < 178 and > 178? What am I missing here?

[SG57]

Originally Posted by framerate

Ahh that's the ticket..

But why is it < 32 and > 233?

Wouldn't it be < 178 and > 178? What am I missing here?

Ok, start up some game with analog support, move tha analog stick up a little bit, does the thing move? No, because the PSP only recognizes the Analog movements for 32. Any where below that, it's basically pointless cause nothing will happen.

[fchaos]

Originally Posted by framerate

Ahh that's the ticket..

But why is it < 32 and > 233?

Wouldn't it be < 178 and > 178? What am I missing here?

The analog stick is very sensitive, so sometimes when the stick isn't being moved, a value of 150-200 is produced. It's best to stay clear of that range. I don't know why nexis made the values so small though...

[Smerity]

Something I was interested in trying out was kind of a fine analog variation algorithm. Haven't had time to try it yet though.

Basically it's weighted so that if it's below about 25 to 35 it has no effect (ie, think a very very squished parabola, and then you can input our x (analog number) into that and as you push harder the amount it goes becomes further, whilst small values have little effect)

Babble out of the way, here's a snippet of my very simple analog code...

int cursorx = 240, cursory = 136;
float ms = 1;

while (1) {
sceCtrlSetSamplingCycle(0);
sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);
SceCtrlData pad;

sceCtrlReadBufferPositive(&pad, 1);

clearScreen(BLACK);

float cx = ((pad.Lx - 125)/16)*ms;
float cy = ((pad.Ly - 125)/16)*ms;
cursorx = cursorx + (int)cx;
cursory = cursory + (int)cy;
if ( cursorx > 480 ) cursorx = 480;
if ( cursory > 272 ) cursory = 272;
if ( cursorx < 0 ) cursorx = 0;
if ( cursory < 0 ) cursory = 0;

blitAlphaImageToScreen( 0, 0, 24, 24, cursor, (int)cursorx-12, (int)cursory-12);
flipScreen();
sceKernelDelayThread(50000);
}

To note -
ms == mouse speed, which is a variable I change if I need it to move faster

[nexis2600]

Originally Posted by framerate

Ahh that's the ticket..

But why is it < 32 and > 233?

Wouldn't it be < 178 and > 178? What am I missing here?

As someone already noted. The analog is rather sensative and when at rest is not a perfect 128/128. I just gave 32 as an example (in other words only accepting the input that has the analog almost all the way near the edge).

[elevationsnow]

heres my absolutly insane analogue function it does a parabola changing the value 2 you can change how much it accelerates aka the parabola thing you were talking about

         xx = pad.Lx - 130;
         yy = pad.Ly - 130;  
         speed = sqrt((xx*xx)+(yy*yy))/(2*sqrt(sqrt((xx*xx)+(yy*yy))));//harder you press analogue faster it goes
         rotation =  atan2(xx,yy) / (PI/180); //figure out the rotation of the analouge this **** is pointless i was just messing arround im gonna clean this up thats why i called it insane
         x2 = sin(rotation*(PI/180))*speed;
         y2 = cos(rotation*(PI/180))*speed;
         pbrushx = brushx;  //for my brush so it doesnt have gaps from speed its a painting program 
         pbrushy = brushy; 
         if(xx>25 && brushx<480){
         brushx += x2;
         }
         if(xx<-25 && brushx>0){
         brushx += x2;
         }
         if(yy>25 && brushy<272){
         brushy += y2;
         }
         if(yy<-25 && brushy>0){ 
         brushy += y2;
         }

[Smerity]

elevationsnow - lol, wow, that looks a lot more complicated than it did in my head, but same basic concept, good stuff =)