let drawObjectPath = false;

let pathHistoryLimit = 50; // Limit for how many path points to keep

​

// Array to hold all instances in the simulation

let objectArray = [];

let foodArray = [];

let siteArray = [];

​

// Initial parameters for the simulation

let initialObjectNum = 20;

let initialFoodNum = 20;

let initialSiteNum = 2;

let initialSpeed = 5;

let initialAge = 10;

let initialSize = 30;

let initialHunger = 0.5;

let initialStatus = 'doodle';

​

let setAgingFactor = 2;

let setSizingFactor = 2;

let setHungerFactor = 1;

let setEntropyFactor = 1; // The randomness in many process

let setMaxAge = 100;

let setMaxUtility = 3; // An integer, the number of foods a site could generate, and the maximum hunger level a food could recover

let setMaxBirth = 3; // An integer, the number of birth an object could give

let setWorkThreshold = 2; // The ratio below which objects start to work

let workNeeded = 5; // The amount of work needed for a new food to be generated

​

let simStart = false; // Flag indicating whether the simulation has started

let startFrame = null; // Frame count at which the simulation starts

​

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(30);

  // Initialize food objects

  for (i = 0; i < initialFoodNum; i ++) {

    foodArray.push(new Foods(random(windowWidth), random(windowHeight), setMaxUtility));

  }

  // Initialize site objects

  for (i = 0; i < initialSiteNum; i ++) {

    siteArray.push(new Sites(random(windowWidth), random(windowHeight), setMaxUtility));

  }

}

​

function draw() {

  background('#b9d59f');

  // Call behavior function for each object

  for (j = 0; j < objectArray.length; j ++) {

    objectsBehave(objectArray[j]);

  }

  // Call behavior function for each food item

  for (i = 0; i < foodArray.length; i ++) {

    foodsBehave(foodArray[i]);

  }

  // Call behavior function for each site

  for (i = 0; i < siteArray.length; i ++) {

    siteBehave(siteArray[i]);

  }

  // Display the start panel if the simulation hasn't started

  if (simStart === false) {

    startPanel();

    startFrame = frameCount;

  } else if (simStart === true) {

    push();

    fill(255);

    noStroke();

    textAlign(RIGHT, CENTER);

    textSize(20);

    text('Sim Point: ' + (frameCount - startFrame), windowWidth - 10, 20);

    text('Object Alive: ' + objectArray.length, windowWidth - 10, 50);

    textAlign(LEFT, CENTER);

    text('S/O/F + MouseClike to spawn new instance', 10, 20);

    pop();

  }

}

​

function mouseClicked() {

  // Spawn new instances at the mouse location when clicked with different keys pressed

  if (keyCode === 79) { // If the last pressed button is 'O'

    initiateObject(mouseX, mouseY); 

  } else if (keyCode === 70) { // If the last pressed button is 'F'

    foodArray.push(new Foods(mouseX, mouseY, setMaxUtility)); 

  } else if (keyCode === 83) { // If the last pressed button is 'S'

    siteArray.push(new Sites(mouseX, mouseY, setMaxUtility));

  } else {

    // If the simulation hasn't started, initiate it and create initial objects

    if (simStart === false) {

      simStart = true; // Set the simulation start flag to true

      for (i = 0; i < initialObjectNum / 2; i ++) {

         // Spawn initial objects off-screen

        initiateObject(random([0 - initialSize / 2, windowWidth + initialSize / 2]), random(windowHeight));

        initiateObject(random(windowWidth), random([0 - initialSize / 2, windowHeight + initialSize / 2]));

      }

    } 

  }

}

​

​

function initiateObject(x = random(windowWidth), y = random(windowHeight)) {

  // Create and add a new object to the objectArray with parameters set initially

  objectArray.push(new Objects(x , y, 

                               tempAge = initialAge,

                               tempSize = initialSize,

                               tempSpeed = initialSpeed, 

                               tempHunger = initialHunger,

                               tempStatus = initialStatus,

                               tempMaxAge = setMaxAge,

                               agingFactor = setAgingFactor, 

                               sizingFactor = setSizingFactor, 

                               hungerFactor = setHungerFactor, 

                               entropyFactor = setEntropyFactor, 

                               maxBirth = setMaxBirth, 

                               workThreshold = setWorkThreshold));

}

​

function foodsBehave(food) {

  // Manage behaviors for food items

  if (food.status === 'reached') {

    foodArray.splice(i, 1); // Remove the food if it has been reached

  } else {

    food.display();

  }

}

​

function siteBehave(site) {

  // Manage behaviors for sites

  if ((site.workDone != 0) && (site.workDone % workNeeded === 0)) {

    // Generate new food based on work done

    for (i = 0; i < workNeeded; i ++) {

       foodArray.push(new Foods(random(windowWidth), random(windowHeight), setMaxUtility));

    }

    site.workDone = 0; // Reset work done after generating food

    if (siteInfinite === false) {

      site.utility -= 1; // Decrease site utility if not infinite

    }

  }

  // Remove the site if its utility is zero

  if (site.utility === 0) {

    siteArray.splice(i, 1); 

  } else {

    site.display();

  }

}

​

function objectsBehave(object) {

  // Manage behaviors for objects

  object.statusUpdate(); // Update the object's status

  // Handle object behavior based on its current status

  if (object.status === 'doodle') {

    object.doodle();

  } else if (object.status === 'mate') {

    object.move(objectArray); // Move towards other objects

  } else if (object.status === 'work') {

    if (siteArray[0]) {

      object.move(siteArray); // Move towards sites

    } else {

      object.status = 'doodle'; // Change status if no sites are available

    } 

  } else if (object.status === 'eat') {

    if (foodArray[0]) {

      object.move(foodArray);

    } else {

      object.status = 'work';

    }

  } else if (object.status === 'dead') {

    objectArray.splice(j, 1); // Remove the object if it has reached max age

  }

​

  // Periodically update aging, hunger, and direction every 60 frames

  if (frameCount % 60 === 0) {

    object.aging();

    object.hungering();

    object.directing();

  }

​

  // Display the object regardless of its status

  object.display();

}

​

function startPanel() {

  // Create and display the start panel for the simulation

  filter(BLUR); // Apply blur effect to the background

  sp = createGraphics(windowWidth * 0.75, windowHeight * 0.5); // Create Graphics object for the start panel

  sp.background('#a49fd5');

  sp.stroke('white');

  sp.strokeWeight(3);

  sp.fill('white');

  sp.textAlign(CENTER, CENTER);

  sp.textSize(50);

  sp.textFont('Courier New');

  sp.text('Object Life Sim', sp.width / 2, sp.height / 2);

  // Draw the start panel on the canvas

  image(sp, (windowWidth - windowWidth * 0.75) / 2,

            (windowHeight - windowHeight * 0.5) / 2);

}

​

// Adjust canvas size when the window is resized

function windowResized() {

  resizeCanvas(windowWidth, windowHeight);

}

​

// The rest two functions comes from https://editor.p5js.org/mangtronix/full/t4G0erH1B

function keyTyped() {

  // $$$ For some reason on Chrome/Mac you may have to press f twice to toggle. Works correctly on Firefox/Mac

  if (key === 'f') {

    toggleFullscreen();

  }

  // uncomment to prevent any default behavior

  // return false;

}

​

// Toggle fullscreen state. Must be called in response

// to a user event (i.e. keyboard, mouse click)

function toggleFullscreen() {

  let fs = fullscreen(); // Get the current state

  fullscreen(!fs); // Flip it!

}