Trouble with keyCode

Processing Coding Questions
1

Hi, so Iā€™m trying to move a square around the screen using the arrow keys. I have the code written for the square to move right when the right arrow key is pressed, but the square keeps moving once the key is released. How do I make the square stop once the right arrow key is released?

Thanks in advance :slight_smile:

float x, y;

void setup() {
  size(600, 600);
  noStroke();
  x = width/2;
  y = height/2;
}

void draw() {
  background(0);
  rect(x, y, 20, 20);
  
  if (key == CODED) {
    if (keyCode == RIGHT) {
      x = x + 1;
    }
  }
}
1 Like
2

There are built-in methods which called when the key is pressed or released
https://processing.org/reference/keyPressed_.html
https://processing.org/reference/keyReleased_.html
add these method to your code to override the built-in methods
you can use these to handle the situation, something like thiz

void keyPressed(){
    if(key == CODED){
     if(keyCode == RIGHT){
       moving();
     }
  }
}

void keyReleased(){
  if(key == CODED){
     if(keyCode == RIGHT){
       stopMoving();
     }
  }
}

if you bother to use these methods, another way is to use global variable named keyPressed (boolean) which tell if any key being pressed, just modify the code lil bit

if(keyPressed){
 if (key == CODED) {
     if (keyCode == RIGHT) {
     x = x + 1;
    }
  }
}
2 Likes
3

Thanks very much @humayung ! :grin:

4
1 Like