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Adjust imaginary tickvals default to fix react #5992

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Merged
merged 4 commits into from
Oct 29, 2021
Merged

Adjust imaginary tickvals default to fix react #5992

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f7fc31c
fix smith chart react
archmoj Oct 19, 2021
8fe37f4
update draft log for smith charts to include PR 5992
archmoj Oct 19, 2021
3380c0d
Revert "fix smith chart react"
archmoj Oct 29, 2021
844e24c
AJ's suggestion to memorize imaginary tickval defaults
archmoj Oct 29, 2021
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2 changes: 1 addition & 1 deletion draftlogs/5956_add.md
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
- Add `smith` subplots and the `scattersmith` trace type for displaying Smith charts [[#5956](https://github.com/plotly/plotly.js/pull/5956)],
- Add `smith` subplots and the `scattersmith` trace type for displaying Smith charts [[#5956](https://github.com/plotly/plotly.js/pull/5956), [#5992](https://github.com/plotly/plotly.js/pull/5992)],
with thanks to Kitware and @waxlamp for kicking off this effort.
27 changes: 22 additions & 5 deletions src/plots/smith/layout_defaults.js
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Expand Up @@ -16,6 +16,12 @@ var layoutAttributes = require('./layout_attributes');
var constants = require('./constants');
var axisNames = constants.axisNames;

var makeImagDflt = memoize(function(realTickvals) {
return realTickvals.slice().reverse().map(function(x) { return -x; })
.concat([0])
.concat(realTickvals);
}, String);

function handleDefaults(contIn, contOut, coerce, opts) {
var bgColor = coerce('bgcolor');
opts.bgColor = Color.combine(bgColor, opts.paper_bgcolor);
Expand Down Expand Up @@ -55,11 +61,10 @@ function handleDefaults(contIn, contOut, coerce, opts) {
if(isRealAxis) {
coerceAxis('tickvals');
} else {
var realTickvals = contOut.realaxis.tickvals || layoutAttributes.realaxis.tickvals.dflt;
var imagTickvalsDflt =
realTickvals.slice().reverse().map(function(x) { return -x; })
.concat([0])
.concat(realTickvals);
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I imagine the problem with this is we get a new array each time, so Plotly.react thinks this has changed and needs replotting? I do think as a default this behavior makes sense, can we fix it with a simple memoizer? Something like:

function memoize(fn, keyFn) {
    var cache = {};
    return function(val) {
        var newKey = keyFn ? keyFn(val) : val;
        if (newKey in cache) { return cache[newKey]; }
        out = fn(val);
        cache[newKey] = out;
        return out;
    }
}

var makeImagDflt = memoizeOne(function(realTickvals) {
    return realTickvals.slice().reverse().map(function(x) { return -x; })
        .concat([0])
        .concat(realTickvals);
}, String);

var a = makeImagDflt([2,4,5])
var b = makeImagDflt([2,4,5])
a===b // true

var c = makeImagDflt([1,2,3])
var d = makeImagDflt([2,4,5])
d===b // true

A memoizer might be useful in other contexts too... we use them quite a lot in Dash anyway.

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It's a kind of magic!
Applied in 844e24c

var imagTickvalsDflt = makeImagDflt(
contOut.realaxis.tickvals ||
layoutAttributes.realaxis.tickvals.dflt
);

coerceAxis('tickvals', imagTickvalsDflt);
}
Expand Down Expand Up @@ -132,3 +137,15 @@ module.exports = function supplyLayoutDefaults(layoutIn, layoutOut, fullData) {
layoutOut: layoutOut
});
};

function memoize(fn, keyFn) {
var cache = {};
return function(val) {
var newKey = keyFn ? keyFn(val) : val;
if(newKey in cache) { return cache[newKey]; }

var out = fn(val);
cache[newKey] = out;
return out;
};
}