Create a box randomly flying away, then randomly flying back to the oringinal position.

libandp

Hi Guys~!

I've created a box can randomly flying away, but I want it randomly flying back when it outside the screen. Could you help me~?

float x= 50;
float y= 50;
float m1;
float m2;


float xspeed =1;
float yspeed =1;

void setup() {
  size(700, 700);
 
  frameRate(60);
}

void draw() {
   m1 =  random(3);
   m2 =  random(3);
  background(255);

  //1st rect
  x = x+xspeed;
  y = y+yspeed;


  fill(0);
    if (mousePressed && (mouseButton == LEFT)) { //make random movement
      xspeed = xspeed + m1*random(-1, 1);
      yspeed = yspeed + m2*random(-1, 1);
    }
  
    if (mousePressed && (mouseButton == RIGHT)) { // stop movement
      xspeed = 0;
      yspeed = 0;

    }


  strokeWeight(0.2);
  stroke(100);
  rect(x, y, 10, 10);
  println(x);
}

Thank you very much!!

TfGuy44

https://forum.processing.org/two/discussion/15473/readme-how-to-format-code-and-text

Forum regulars tend to ignore your code unless it is formatted properly.

libandp

Thanks TfGuy44, I edite the code and repost it. ;;)

TfGuy44

float x= 50;
float y= 50;
float m1;
float m2;


float xspeed =1;
float yspeed =1;

void setup() {
  size(700, 700);
  rectMode(CENTER);
}

void draw() {
  m1 =  random(3);
  m2 =  random(3);
  background(255);

  //1st rect
  x = x+xspeed;
  y = y+yspeed;


  fill(0);
  if (mousePressed && (mouseButton == LEFT)) { //make random movement
    xspeed = xspeed + m1*random(-1, 1);
    yspeed = yspeed + m2*random(-1, 1);
  }

  if (mousePressed && (mouseButton == RIGHT)) { // stop movement
    xspeed = 0;
    yspeed = 0;
  }
  if ( x < -10 || x > width + 10 || y < -10 || y > height + 10 ) {
    reset();
  }
  strokeWeight(0.2);
  stroke(100);
  rect(x, y, 10, 10);
  println(x);
}

void reset() {
  switch(int(random(4))) {
  case 0:
    y = -5;
    yspeed = random(0, 10);
    x = random(width);
    xspeed = random(-10, 10);
    break;
  case 1:
    y = height+5;
    yspeed = random(-10, 0);
    x = random(width);
    xspeed = random(-10, 10);
    break;
  case 2:
    x = -5;
    xspeed = random(0, 10);
    y = random(height);
    yspeed = random(-10, 10);
    break;
  case 3:
    x = width+5;
    xspeed = random(0, 10);
    y = random(height);
    yspeed = random(-10, 10);
    break;
  }
}

libandp

HI TfGuy44, Thanks! but I think I didn't explain my question very well, my English is poor. Let me organize the question again.

I create the little black box, and when I press the mouse, it will make random movement, until it outside the screen, but I want the black box randomly fly back to its original position which is x=50; y = 50; when it outside the screen, and then stop there. You can ignore the mouse press function when it flying back :D

TfGuy44

Alright. Instead of giving it a new random position and direction when it reaches the edge, you want to give it a very specific direction instead - one that aims it back to the starting point. You know where it is at that moment ((x,y)). You know where it should be going to ((50,50)). So what's the specific direction it needs to go in? (A diagram would help! Draw one! You might need to use PVectors...)

How will you detect when it is back at the starting point? Will it be an exact position? What should happen when it is "close enough" to the starting point?

How are you going to remember if it is moving in a random direction or heading back to the starting point? What shouldn't happen if it is returning?

It might help immensely if you write out the step your sketch should take in plain words, and then translate that process into code. Attempt this yourself first, and post the code - or plain words - of your attempt for more help.

libandp

Alright! Thanks TfGuy44! I will try this first by myself, if I have any question I will ask you again!

jeremydouglass

There is another way of approaching this.

1. You have a fixed point, 50,50
2. On click, pick a random point outside the screen -- for example, a point on the circumference of a large circle.
3. Over time, use interpolation to find a point on the path between those two points. This can be done by using lerp, or by using PVector.lerp