Midterm Progress 2

Project Development

1. Fertility & Death Rate Integration: By this phase, I fully incorporated fertility and death rates. Each region now grows or shrinks based on these factors, and in Stability Mode, populations stabilize around a 2.1 replacement rate.
2. Mode Switching: Users can toggle between Growth, Random, and Stability modes using the keyboard.
3. Visual Feedback: The size of each circle dynamically adjusts based on the population changes, offering a visual representation of how populations are evolving in each region.
4. Significant Code Progress: Implemented the full logic for handling different population behaviors across modes.

Code Refinements

In this phase, I added full functionality for fertility and death rates, and populations now stabilize in Stability Mode.

let regions = [];
let mode = 0; // Mode selector

function setup() {
  createCanvas(800, 800);
  let gridSize = 4;
  let spacing = width / gridSize;
  
  for (let i = 0; i < gridSize; i++) {
    for (let j = 0; j < gridSize; j++) {
      let x = spacing * i + spacing / 2;
      let y = spacing * j + spacing / 2;
      let population = random(50, 200);
      let fertilityRate = random(1.5, 5);
      let deathRate = random(0.5, 3);
      regions.push(new Region(x, y, population, fertilityRate, deathRate));
    }
  }
}

function draw() {
  background(255);
  switch (mode) {
    case 0:
      growthMode();
      break;
    case 1:
      randomMode();
      break;
    case 2:
      stabilityMode();
      break;
  }
}

function keyPressed() {
  if (key === '1') mode = 0;
  if (key === '2') mode = 1;
  if (key === '3') mode = 2;
}

function growthMode() {
  for (let region of regions) {
    region.grow();
    region.display();
  }
}

function randomMode() {
  for (let region of regions) {
    region.randomizeRates();
    region.grow();
    region.display();
  }
}

function stabilityMode() {
  for (let region of regions) {
    region.stabilize();
    region.grow();
    region.display();
  }
}

Three Variations for Export

1. Growth Mode: Populations grow or shrink based on initial fertility and death rates.
2. Random Mode: Random changes in fertility and death rates cause erratic population behaviors.
3. Stability Mode: Populations gradually stabilize around the replacement rate.

I exported these three variations in SVG format using the save() function in p5.js.

function keyPressed() {
  if (key === 's') {
    save(); // Saves the current state as SVG
  }
}