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Updated grid size heuristic

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This commit is contained in:
Mitchell McCaffrey 2020-10-09 11:23:52 +11:00
parent 60a163f351
commit 88a529eb14
1 changed files with 17 additions and 11 deletions
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28
src/helpers/map.js
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@ -29,23 +29,29 @@ function dividers(a, b) {
return factors(d);
}
const commonGridScales = [70, 111, 140, 300];
const commonGridScales = [35, 70, 72, 111, 140, 144, 300];
// Most grid scales are above 10 and below 100
function gridScaleVaild(x, y) {
return x > 10 && y > 10 && x < 100 && y < 100;
}
export function gridSizeHeuristic(width, height) {
const div = dividers(width, height);
if (div.length > 0) {
// default to middle divider
let scale = div[Math.floor(div.length / 2)];
for (let common of commonGridScales) {
// Check common but make sure the grid size is above 10
if (div.includes(common) && width / common > 10 && height / common > 10) {
scale = common;
let x = 1;
let y = 1;
// Check common scales but make sure the grid size is above 10 and below 100
for (let scale of commonGridScales) {
const tempX = Math.floor(width / scale);
const tempY = Math.floor(height / scale);
if (div.includes(scale) && gridScaleVaild(tempX, tempY)) {
x = tempX;
y = tempY;
}
}
const x = Math.floor(width / scale);
const y = Math.floor(height / scale);
// Check grid size is below 100
if (x < 100 && y < 100) {
if (gridScaleVaild(x, y)) {
return { x, y };
}
}