Genuary 2025 day 5

// By Roni Kaufman

// https://ronikaufman.github.io

​

// Made for Genuary 2025

// Day 5: Isometric Art (No vanishing points).

​

function setup() {

  createCanvas(500, 500);

  noLoop();

}

​

function draw() {

  background("#fffbe6");

  stroke(5);

  strokeWeight(1);

  let n = 6;

  let cols = [...Array(n)].map((e) => Array(n));

  let palette = ["#2b67af", "#f9d531", "#ef562f", "#29ac9f", "#f589a3"];

  for (let j = 0; j < n; j++) {

    for (let i = 0; i < n; i++) {

      let neighborColors = [];

      if (i > 1) neighborColors.push(cols[i-2][j]);

      if (j > 1) neighborColors.push(cols[i][j-2]);

      if (i > 0 && j > 0) neighborColors.push(cols[i-1][j-1]);

      if (i < n-1 && j > 0) neighborColors.push(cols[i+1][j-1]);

      let col;

      do {

        col = random(palette);

      } while (neighborColors.indexOf(col) != -1)

      cols[i][j] = col;

    }

  }

  makeHexagon(width/2, height/2, 175, n, [[[5], cols], [["#fffbe6"], [5]], [cols, ["#fffbe6"]]]);

}

​

function makeHexagon(x0, y0, s, n, cols) {

  for (let theta = 0; theta < TAU; theta += TAU/3) {

    makeFacet(x0, y0, s, n, theta, cols.pop());

  }

}

​

function makeFacet(xA, yA, s, n, rot, cols) {

  push();

  translate(xA, yA);

  rotate(rot);

  let rw = s*sqrt(3)/2, rh = s/2;

  xA = 0; yA = 0;

  let xB = rw, yB = rh;

  let xC = 0, yC = 2*rh;

  let xD = -rw, yD = rh;

  let [xi, yi] = lerpPoints(xA, yA, xB, yB, 1/n);

  let [xj, yj] = lerpPoints(xA, yA, xD, yD, 1/n);

  for (let i = 0; i < n; i++) {

    for (let j = 0; j < n; j++) {

      let xa = i*xi + j*xj, ya = i*yi + j*yj;

      let xb = (i+1)*xi + j*xj, yb = (i+1)*yi + j*yj;

      let xc = (i+1)*xi + (j+1)*xj, yc = (i+1)*yi + (j+1)*yj;

      let xd = i*xi + (j+1)*xj, yd = i*yi + (j+1)*yj;

      let colChoice = cols[(i+j)%2];

      let col = colChoice.length == 1 ? colChoice[0] : colChoice[i][j];

      fill(col);

      quad(xa, ya, xb, yb, xc, yc, xd, yd);

    }

  }

  pop();

}

​

function lerpPoints(x1, y1, x2, y2, t) {

  return [x1*(1-t)+x2*t, y1*(1-t)+y2*t];

}