PS4 TouchPad Help

[xenologer]

Hey

I'd doing a simple test script to attempt to Detect touchpad swipes and direction - up, down, left, right.

But I'm getting an odd bug where if the touch swipe crosses the origin, I get an unexpected reversed +-signed result.

Note the Trace Values 4 and 5. keying on these to determine the touch swipe direction.

Can anyone see what I might have missed?
Thanks

Code: Select all

 
/* *
* GPC SCRIPT
* 
*  GPC is a scripting language with C-like syntax.
*  To learn more access GPC Language Reference on Help menu.
* *********************************************************** */
int TOUCHING=0;
int tx1,tx2,txd;
int ty1,ty2,tyd;
 
main {
 
    if(ps4_touchpad(PS4T_P1)) {
        set_val(TRACE_1, 100);
        set_val(TRACE_2, ps4_touchpad(PS4T_P1X));
        set_val(TRACE_3, ps4_touchpad(PS4T_P1Y));
    } else set_val(TRACE_1, 0);
 
    //DETECT and save first touch point
    if(!TOUCHING){
         if(ps4_touchpad(PS4T_P1)) {
            TOUCHING=1;
            tx1=ps4_touchpad(PS4T_P1X);
            ty1=ps4_touchpad(PS4T_P1Y);
         }
    }
 
    if(TOUCHING){
        //Continued touch input held (in motion)
        if(ps4_touchpad(PS4T_P1)){
            tx2=ps4_touchpad(PS4T_P1X);
            ty2=ps4_touchpad(PS4T_P1Y);
        }
        //DETECT touch ending point
        if(!ps4_touchpad(PS4T_P1)){
            TOUCHING=0;
            txd=tx2-tx1;
            tyd=ty2-ty1;
 
            //FIND DIRECTION
            if(abs(txd)>abs(tyd)){
                //horizontal sweep
                if(txd>0){
 
                }else{
 
                }
 
            }else{
                //vertical sweep
                if(tyd>0){
 
                }else{
 
                }
 
            }
 
 
 
        }
    }
 
    set_val(TRACE_4,txd);
    set_val(TRACE_5,tyd);
 
}
 
//blue,red,green,purple
function LED(a, b, c, d){
    set_led(0, a);
    set_led(1, b);
    set_led(2, c);
    set_led(3, d);
}
 
 

[xenologer]

I'm just using straightforward vector math:
mark the coordinates of touch start
mark coordinates of touch stopping
then subtract the difference, and check +-signage to determine direction
fairly clear cut

so most likely, I'm misinterpreting how the touchpad states work or something; if there is something I'm missing, I haven't found it in the GPC docs....

[J2Kbr]

Your script seems to be correct and should work.

But I'm getting an odd bug where if the touch swipe crosses the origin, I get an unexpected reversed +-signed result.

Maybe because the value on TRACE_* is overflowing, TRACE_ can only display signed 8bits integers (-128 to 127), and your math can potentially result on values out of this range (up to 200), which overflows. however the variables txd and tyd have the correct value and the script should work as expected.

[xenologer]

Yes that was exactly it!
scaling the values before display results in the correct signage
Thanks very much