Simple Processing sketch to generate algorithmic islands

Algorithmic Islands

/*
SMELL GAME LEVEL TESTS
 Jeff Thompson | 2013 | www.jeffreythompson.org
 
 Ideas:
 + Run forest fire simulation to set terrain
 
 */

int w = 200;
int h = 200;
int maxInsetMove = 1;    // amount the land can move inward per step (up to edgeThresh)
int edgeThresh = 200;

int[][] level = new int[h][w];

void setup() {
  size(w, h);

  for (int i=0; i<120; i++) {
    if (i%20 == 0) {
      maxInsetMove += 1;
    }
    createLevel(w, h, maxInsetMove, edgeThresh);
    displayLevel(color(70, 150, 220), color(75, 95, 40), true, i);
  }
}

void createLevel(int w, int h, int maxInsetMove, int edgeThresh) {

  // clear level
  for (int y=0; y<h; y++) {
    for (int x=0; x<w; x++) {
      level[y][x] = -1;
    }
  }

  // top
  int rx = 0;
  int ry = 0;
  while (rx < w) {
    for (int y=ry; y>=0; y--) {
      level[y][rx] = 1;
    }
    rx += int(random(0, 2));
    rx = constrain(rx, 0, w);
    ry += int(random(-maxInsetMove, maxInsetMove));
    ry = constrain(ry, 0, edgeThresh);
  }

  // bottom
  rx = 0;
  ry = height-1;
  while (rx < w) {
    for (int y=ry; y<h; y++) {
      level[y][rx] = 1;
    }
    rx += int(random(0, 2));
    rx = constrain(rx, 0, w);
    ry += int(random(-maxInsetMove, maxInsetMove));
    ry = constrain(ry, height-edgeThresh, height-1);
  }

  // left
  rx = 0;
  ry = 0;
  while (ry < h) {
    for (int x=rx; x>=0; x--) {
      level[ry][x] = 1;
    }
    ry += int(random(0, 2));
    ry = constrain(ry, 0, h);
    rx += int(random(-maxInsetMove, maxInsetMove));
    rx = constrain(rx, 0, edgeThresh);
  }

  // right
  rx = w-1;
  ry = 0;
  while (ry < h) {
    for (int x=rx; x<w; x++) {
      level[ry][x] = 1;
    }
    ry += int(random(0, 2));
    ry = constrain(ry, 0, h);
    rx += int(random(-maxInsetMove, maxInsetMove));
    rx = constrain(rx, w-edgeThresh, w-1);
  }
}

void displayLevel(color sea, color land, boolean saveIt, int iteration) {
  loadPixels();
  for (int i=0; i<pixels.length; i++) {
    if (level[i/width][i%width] == 1) {
      pixels[i] = sea;
    }
    else {
      pixels[i] = land;
    }
  }
  updatePixels();

  if (saveIt) {
    save("output/island_" + iteration + ".png");
  }
}