Coordinates on touchscreen

[boriar]

How can I know the coordinates where I touch on screen?

[boriar]

Come on!
Can anyone give me a guidance?

[tshering]

Maybe this can help you. I did some experiments on a Touch.
First I give you the fbset output as reference.

[root@(none) ~]# fbset

mode "800x600-0"
        # D: 0.033 MHz, H: 0.034 kHz, V: 0.055 Hz
        geometry 800 600 800 1280 16
        timings 30000000 8 164 4 18 4 1
        accel false
        rgba 5/11,6/5,5/0,0/0
endmode

Now comes the reading of the touch coordinates:

[root@(none) ~]# result=`od -i -N 128 /dev/input/event1`; echo "$result"
// At this point I touched the top right corner of the screen (device held as usual). The coordinates are in the lines that start with 0000120 and 0000140, they are 41x40.
0000000 -12329  22021 -15044      4      3      0    549      0
0000020 -12329  22021 -15017      4      3      1    776      0
0000040 -12329  22021 -15007      4      3     24      0      0
0000060 -12329  22021 -14999      4      1    330      0      0
0000100 -12329  22021 -14992      4      0      0      0      0
0000120 -12314  22021  -5950     13      3      1     41      0
0000140 -12314  22021  -5922     13      3      0     40      0
0000160 -12314  22021  -5911     13      3     24    101      0
0000200

And a further example:

[root@(none) ~]# result=`od -i -N 128 /dev/input/event1`; echo "$result"
// At this point I touched the bottom left corner. The coordinates are in the lines that start with 0000120 and 0000140, they are 560x781.
// As you see the coordinates of the previous touch event are repeated in the lines that start with 0000020 and 0000040.

0000000 -12214  22021     15     15      3      0     41      0
0000020 -12214  22021     42     15      3      1     40      0
0000040 -12214  22021     53     15      3     24      0      0
0000060 -12214  22021     60     15      1    330      0      0
0000100 -12214  22021     66     15      0      0      0      0
0000120 -12207  22021  11228      5      3      1    560      0
0000140 -12207  22021  11259      5      3      0    781      0
0000160 -12207  22021  11270      5      3     24    100      0
0000200

So you could call in a script od -i -N 128 /dev/input/event1, and parse the result.

[frostschutz]

pickel has a mode that makes it print out touch coordinates, if you need it in a shell script

otherwise read from the input, it's fairly standard, google any touchscreen howto

[boriar]

frostschutz, I need only the numbers but yes, I try to put it in a shell script. If pickel can print then may be it also can be used on a variable. I will try.

tshering, thank you so much for your comments. I look into it.

[tshering]

Originally Posted by boriar

If pickel can print then may be it also can be used on a variable. I will try.

There was already a little discussion on the use of pickel for this purpose.

It seems that you have to call pickel wait-for-hit always twice (if you want to use it more than once). After the first call pickel waits that you touch the screen, and then outputs the coordinates. After the second call pickel does not wait and outputs immediately the coordinates, but now with the values for x and y exchanged.

[boriar]

You are right. I forgot that.
Thanks again