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Odd or even hex grid

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This commit is contained in:
Catalin Constantin Mititiuc 2025-06-16 22:41:31 -07:00
parent 20d423803e
commit 8e19487954
1 changed files with 77 additions and 63 deletions
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140
src/radial.js
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@ -3,10 +3,26 @@ if (window.IS_DEV) {
source.addEventListener('change', () => location.reload());
}
const xmlns = 'http://www.w3.org/2000/svg';
const svg = document.querySelector('svg');
const hex = {
inradius: 8.66,
circumradius: 10,
}
const horzSpacing = hex.inradius;
const vertSpacing = hex.circumradius * 3 / 2;
function toKey(q, r, s) {
return `${[q, r, s]}`;
}
function sameSigns(a, b) {
return a > -1 && b > -1 || a < 0 && b < 0;
}
function getNeighbors(coords) {
const [q, r, s] = coords.split(',').map(n => +n);
@ -45,19 +61,21 @@ function generateRadialCoords(l, { q, r, s }, radius) {
return list;
}
function sameSigns(a, b) {
return a > -1 && b > -1 || a < 0 && b < 0;
}
function generateRadialCoordsRect({ rows, columns }, { q = 0, r = 0, s = 0 } = {}) {
function generateRadialCoordsRect({ rows, columns, odd = false } = {}, { q = 0, r = 0, s = 0 } = {}) {
const list = new Set();
for (let col = 0; col < columns; col++) {
for (let rw = 0; rw < rows; rw++) {
const alternate = rw % 2;
const dq = -(alternate + rw) / 2 + alternate - col;
const dr = rw;
const ds = -(rw + alternate) / 2 + col;
for (let row = 0; row < rows; row++) {
const alternating = row % 2;
const dr = row;
let dq = -(alternating + row) / 2 + alternating - col;
let ds = -(row + alternating) / 2 + col;
if (odd) {
dq = dq - alternating;
ds = ds + alternating;
}
list.add(toKey(q + dq, r + dr, s + ds));
}
@ -66,60 +84,56 @@ function generateRadialCoordsRect({ rows, columns }, { q = 0, r = 0, s = 0 } = {
return list;
}
const hex = {
inradius: 8.66,
circumradius: 10,
function drawHexes(el, list) {
list.forEach(key => {
const [q, r, s] = key.split(',').map(n => +n);
let x;
if (q === s)
x = 0;
else if (sameSigns(q, s))
x = Math.abs(q - s);
else
x = Math.abs(q) + Math.abs(s);
x = (q > s ? -1 : 1) * x * horzSpacing;
y = r * vertSpacing;
const g = document.createElementNS(xmlns, 'g');
g.setAttributeNS(null, 'transform', `translate(${x}, ${y})`);
const use = document.createElementNS(xmlns, 'use');
use.setAttributeNS(null, 'href', '#hex');
const qText = document.createElementNS(xmlns, 'text');
qText.textContent = q;
qText.setAttributeNS(null, 'x', -3);
qText.setAttributeNS(null, 'y', -3);
const rText = document.createElementNS(xmlns, 'text');
rText.textContent = r;
rText.setAttributeNS(null, 'x', 5);
rText.setAttributeNS(null, 'y', 1.5);
const sText = document.createElementNS(xmlns, 'text');
sText.textContent = s;
sText.setAttributeNS(null, 'x', -3);
sText.setAttributeNS(null, 'y', + 5);
[use, qText, rText, sText].forEach(el => g.appendChild(el));
el.appendChild(g);
// map.set(key, g);
});
}
const horzSpacing = hex.inradius;
const vertSpacing = hex.circumradius * 3 / 2;
const grid = generateRadialCoordsRect({ rows: 10, columns: 14 }, { q: 9, r: -5, s: -4 });
const building1 = generateRadialCoordsRect({ rows: 4, columns: 3 }, { q: 6, r: -3, s: -3 });
const building2 = generateRadialCoordsRect({ rows: 4, columns: 3, odd: true }, { q: 0, r: -4, s: 4 });
const building3 = generateRadialCoords(new Map(), { q: -1, r: 2, s: -1 }, 1);
// let list = generateRadialCoords(new Map(), { q: 2, r: 0, s: -2 }, 1);
// list = generateRadialCoords(list, { q: -2, r: 0, s: 2 }, 1);
// list = generateRadialCoords(list, { q: 0, r: 0, s: 0 }, 0);
const list = generateRadialCoordsRect({ rows: 4, columns: 5 }, { q: 7, r: -4, s: -3 });
const svg = document.querySelector('svg');
const xmlns = 'http://www.w3.org/2000/svg';
building1.forEach(coords => grid.delete(coords));
building2.forEach(coords => grid.delete(coords));
building3.forEach(coords => grid.delete(coords));
// const map = new Map();
list.forEach(key => {
const [q, r, s] = key.split(',').map(n => +n);
let x;
if (q === s)
x = 0;
else if (sameSigns(q, s))
x = Math.abs(q - s);
else
x = Math.abs(q) + Math.abs(s);
x = (q > s ? -1 : 1) * x * horzSpacing;
y = r * vertSpacing;
const g = document.createElementNS(xmlns, 'g');
g.setAttributeNS(null, 'transform', `translate(${x}, ${y})`);
const use = document.createElementNS(xmlns, 'use');
use.setAttributeNS(null, 'href', '#hex');
const qText = document.createElementNS(xmlns, 'text');
qText.textContent = q;
qText.setAttributeNS(null, 'x', -3);
qText.setAttributeNS(null, 'y', -3);
const rText = document.createElementNS(xmlns, 'text');
rText.textContent = r;
rText.setAttributeNS(null, 'x', 5);
rText.setAttributeNS(null, 'y', 1.5);
const sText = document.createElementNS(xmlns, 'text');
sText.textContent = s;
sText.setAttributeNS(null, 'x', -3);
sText.setAttributeNS(null, 'y', + 5);
[use, qText, rText, sText].forEach(el => g.appendChild(el));
svg.appendChild(g);
// map.set(key, g);
});
drawHexes(svg, grid);