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intval3
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Make mobile.fnumber a global helper function fnumber()

This commit is contained in:
mmcwilliams 2018-02-04 18:17:36 -05:00
parent 85a529c705
commit df578bb678
1 changed files with 45 additions and 32 deletions
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77
app/www/static/js/intval.mobile.js
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@ -465,63 +465,55 @@ mobile.cameraExposure = function (exif) {
const cIso = exif.ISOSpeedRatings[0];
//convert fstop to "fnumber", an absolute scale where stops are scaled to 1.0
const f = mobile.fnumber(cFstop);
const target = mobile.fnumber(fstop); //bolex
const f = fnumber(cFstop);
const target = fnumber(fstop); //bolex
let exposure = cExposure;
let isoStops = 0;
let fStops = 0;
let expDiff;
let scale_elem;
let exposure_elem;
let proceed;
let e1;
let e2;
mobile.exif = exif;
console.dir(exif);
console.log(`fstop : ${fstop}`);
console.log(`iso : ${iso}`);
bol_f.value = fstop;
bol_iso.value = iso;
console.log(`cExposure : ${cExposure}`);
console.log(`cFstop : ${cFstop}`);
console.log(`cIso : ${cIso}`);
cam_exp.value = cExposure;
cam_f.value = cFstop;
cam_iso.value = cIso;
console.log(`f : ${f}`);
console.log(`target : ${target}`);
//Determine if fstop of phone camera "f"
if (target !== f) {
fStops = f - target;
exposure = exposure / Math.pow(2, fStops);
}
bol_f_diff.innerHTML = Math.round(parseFloat(-fStops) * 10) / 10;
console.log(`fstops : ${fStops}`);
console.log(`exposure => ${exposure}`);
if (cIso != iso) {
isoStops = (Math.log(cIso) / Math.log(2)) - (Math.log(iso) / Math.log(2));
}
bol_iso_diff.innerHTML = Math.round(parseFloat(isoStops) * 10) / 10;
console.log(`isoStops : ${isoStops}`)
//Double or halve exposure based on the differences in ISO stops
exposure = exposure * Math.pow(2, isoStops);
console.log(`exposure => ${exposure}`);
console.log(`prism : ${prism}`);
//Compensate for Bolex prism
exposure = exposure * Math.pow(2, prism);
console.log(`exposure => ${prism}`);
exposure = Math.round(exposure) //round to nearest millisecond
bol_f.value = fstop;
bol_iso.value = iso;
bol_exp.value = exposure;
bol_exp_diff.value = 0;
//Total difference in exposure from phone camera to Bolex
expDiff = (Math.log(exposure) / Math.log(2)) - (Math.log(cExposure) / Math.log(2));
bol_exp_diff.innerHTML = floatDisplay(expDiff);
bol_iso_diff.innerHTML = floatDisplay(isoStops);
bol_f_diff.innerHTML = floatDisplay(-fStops);
cam_exp.value = cExposure;
cam_f.value = cFstop;
cam_iso.value = cIso;
if (exposure > 500) {
proceed = confirm(`Set camera exposure to ${exposure}ms to match photo.`);
@ -594,10 +586,6 @@ mobile.refreshExposure = function () {
}
};
mobile.fnumber = function (fstop) {
return Math.log(fstop) / Math.log(Math.sqrt(2));
};
mobile.EV = function (fstop, shutter) {
const sec = shutter / 1000; //shutter in ms => seconds
const square = Math.pow(fstop, 2);
@ -618,4 +606,29 @@ function stringToBytes(string) {
array[i] = string.charCodeAt(i);
}
return array.buffer;
}
}
function fnumber (fstop) {
return Math.log(fstop) / Math.log(Math.sqrt(2));
}
function floatDisplay (value) {
let str = value + '';
const period = str.indexOf('.');
if (period === -1) {
str = str + '.0';
} else {
str = roundTenth(value) + '';
}
if (value < 0) {
str = `<span class="neg">${(str + '')}</span>`;
} else if (value > 0) {
str = `<span class="pos">+${(str + '')}</span>`;
}
return str;
}
function roundTenth (value) {
return Math.round((value * 10) / 10)
}