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Index › Programming Questions & Help › Syntax Questions › CONTROL + char commands.
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CONTROL + char commands. (Read 733 times)
0p0
CONTROL + char commands.
Aug 8th, 2009, 11:48am  
Hello everybody!

I'm developing this live visuals program in Processing, and I was curious about giving it some keyboard-stroke comands. Until now I have reserved lowercase letters for typing and uppercase letters for commands, so if I want to save a screenshot of the running program I have to hit SHIFT + S; on the other hand, a lowercase 's' would do nothing at all, so I can still use the keyboard to type some text to be displayed, but only in lowercase, which is annoing.

My question is:
Is there a way to do the same in Processing but with the CONTROL key?
I think it's better (and more intuitive) to save comands for the CONTROL key. I tried different (newbie) ways to do this, but none of them worked.

Any advice? Smiley

Thank you! Smiley
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antiplastik
Re: CONTROL + char commands.
Reply #1 - Aug 9th, 2009, 6:46am  
Did you check the reference and the keyCode variable?
http://processing.org/reference/keyCode.html

Looks like it can help you detect whether the user pressed the control key or not. You can store the state of the control key in a boolean :

Code:
boolean ctrlPressed;

void keyPressed() {
  // special key
  if (key == CODED) {
    if (keyCode == CONTROL) {
      ctrlPressed = true;
    }
  }
  // regular key
  else {
    if (ctrlPressed) {
      // CTRL + KEY
    }
    else {
      // OTHER
    }
  }
}

void keyReleased() {
  if (key == CODED) {
    if (keyCode == CONTROL) {
      ctrlPressed = false;
    }
  }
}
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0p0
Re: CONTROL + char commands.
Reply #2 - Aug 20th, 2009, 2:00am  
Nice Smiley

I think it should also work for

Code:
boolean ctrlPressed;

void keyPressed() {
  // special key
  if (key == CODED) {
    if (keyCode == CONTROL) {
      ctrlPressed = true;
    }
  }
  // regular key
  else {
    if (ctrlPressed && key == 'a') {
      //do something
    }
    else {
      // do another thing
    }... ... ...


does it?

I'll try your approach! thank you veru much! Cheesy
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antiplastik
Re: CONTROL + char commands.
Reply #3 - Aug 20th, 2009, 3:08am  
Looks like it won't work until you use keyCode instead of key :

Code:
if (ctrlPressed && keyCode == 65) {
  // do something
}
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0p0
Re: CONTROL + char commands.
Reply #4 - Aug 22nd, 2009, 1:21pm  
thank you very much!
It's working beautifuly Cheesy
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