Hi all,

I was trying to write a simulation program and want to pause it every single step. Whenever a user presses a specified key, the simulation continues.

I used a while loop to repeat drawing current status and wait a user's key command. Specially, when a user presses the specified key, it will change the value of the expression in while loop. But it seemed that it cannot detect that a key is pressed and cannot leave the loop:(
I don't know why. Please help me out. Thanks!

Here are the related code.

boolean simOn = true;

void keyPressed(){
 println("key pressed"); // even did not print this line
 if( key == ' ' ){
   if(simOn == false){
     simOn = true;
   }
   else{
       simOn = false;
   }
}

void draw(){
  function1();
}

void function1(){
     simOn = false;
     while(!simOn){
       draw_function1();
       // hopefully, a user presses the space, then it leaves this loop
       // but it always loops here
     }
}