CODEWITHSUNDEEP
javaprocessing
user11582989
user11582989

Reputation:

Making a action/variable change only happen once, everytime a key is pressed

I wrote code that is supposed to remove 25 HP (health points) each time a rectangle (created by pressing the m key) intersects another rectangle, the enemy. Currently, the enemy looses 25HP continuously after I've pressed the m key only once until I press the m key again outside of the enemy body.

This is my damage code for the enemy. It turns white when killed, that's why I have df1 etc. there.

void damage() {

    //if (callMethod) {
    HP -=25;


    //callMethod = false;
    System.out.println(" " + HP);

    //}

    if (HP == 0) {
        df1 = 200;
        df2 = 200;
        df3 = 200;
    }
}

This is the code for the m input. 

void Fight() {
    if (keyPressed) {

      if (key == 'm'|| key == 'M') {
        //villkor, flytta höger, X-led.
        fill(255, 0, 0, 63);
        noStroke();
        rect(xF, yF, wF, hF);
        xFF = xF;
        yFF = yF;
        wFF = wF;
        hFF = hF;

      }
   }
}

Here I have my intersect code:

if (g.intersect(f)) {
    f.damage();
}

I would appreciate any help I can get. Apologies for my bad English grammar :)

Upvotes: 0

Views: 183

Answers (1)

Kevin Workman
Kevin Workman

Reputation: 42174

You can use another boolean variable that tracks whether the action was already taken.

Here's a small example:

boolean alreadyPressed = false;

void draw() {}

void mousePressed() {
  if(!alreadyPressed){
   background(random(255)); 
  }
  alreadyPressed = true;
}

You can then reset the boolean variable whenever you want to be eligible to detect the event again.

Upvotes: 0

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