I would like to have an approximate indication of the picture ratio. The specifications are 16/9 and 3/1;
The example image i will check has the dimensions of 1281x720px;
To calculate the ratio i use this code:
const gcd = (a, b) => b ? gcd(b, a % b): a;
const aspectRatio = (width, height) => {
const divisor = gcd(width, height);
return `${width / divisor}:${height / divisor}`;
};
This code works fine.
Well, is there a possibility to check if the picture is closer to 16/9 or to 3/1? An approximate indication is enough for me
Maybe something like this?
const aspectRatio = (width, height) => {
const ratio = (width/height)-(16/9) < 0.1
? '16:9'
: ((width/height)-(3/1) < 0.1 ? '3:1' : 'out of spec');
return `${ratio}`;
};
console.log(aspectRatio(1281, 720));
console.log(aspectRatio(606, 202));
console.log(aspectRatio(320, 100));note that the "tolerance" I chose is arbitrary at 10% now, the larger the image dimensions the more inaccurate it becomes (because 10% will be a larger pixel deviation range), so you might want to consider lowering it to your liking...the code above is definitely not elegant =), but for your specific scenario it should work.
A more "elegant" and more flexible solution would be a slightly extended version of your function, something like this:
const aspectRatio = (width, height, tolerance = 0.1, specs = ['16:9', '3:1']) => {
return specs.filter((spec) => {
if ( Math.abs((width/height)-eval(spec.replace(':', '/'))) <= tolerance ) {
return spec;
}
})[0] || false;
};
console.log(aspectRatio(1281, 720));
console.log(aspectRatio(606, 202));
console.log(aspectRatio(320, 100));this would allow to specify