8000 add support for min/max scale limits by mojoaxel · Pull Request #5192 · plotly/plotly.js · GitHub
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add support for min/max scale limits #5192

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add support for min/max scale limits #5192

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a392b74
feat(geo): support min/max scale limits
mojoaxel Oct 5, 2020
df23838
refactor: rename min/max scale limits
mojoaxel Oct 26, 2020
388c0b0
chore: use dflt: -1 instad of null
mojoaxel Oct 26, 2020
d531576
feat: handle maxscale default in scaleExtent
mojoaxel Oct 26, 2020
b0daf38
chore: only r 8000 erender on zoom if scale changes
mojoaxel Oct 26, 2020
b46375a
chore: fix typo in min/maxscale attributes
mojoaxel Oct 26, 2020
c42cb9d
test: adopt test/plot-schema.json to new plot-schema
mojoaxel Jun 10, 2024
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chore: use dflt: -1 instad of null
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@mojoaxel
mojoaxel committed Jun 10, 2024
commit 388c0b0072f11d4077b246cde1a6f8ebc12e0627
1 change: 1 addition & 0 deletions src/components/modebar/buttons.js
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Expand Up @@ -551,6 +551,7 @@ function handleGeo(gd, ev) {
var minscale = geoLayout.projection.minscale;
var maxscale = geoLayout.projection.maxscale;
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Now we need to handle

if(maxscale === null) maxscale = Infinity;

or

if(maxscale === -1) maxscale = Infinity;

if we decide to use -1 instead of null which is not a number.
@alexcjohnson your idea on which one is better?

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With e722947 I changed the default to -1 instead of null. Scales with less than 0 make no sense here so this should be a valid solution.

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I suppose -1 as a default is OK if we really need a "no max" value - it's better than null which behaves oddly in relayout.

But I wonder if we can't pick a decent default that's more zoomed in than is generally ever useful. I have occasionally gotten in a situation by accidentally scroll zooming so far in that everything freezes up because the SVG engine is having trouble drawing all the off-screen elements. If we cover 99% of cases and avoid this pitfall I'd say that's a reasonable tradeoff, and avoids making a coded value. Something like 10,000?

Similarly, is there a default we could use for minscale, to avoid zooming the whole map away to a point? 0.1 perhaps?

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Something like 10,000?
Similarly, is there a default we could use for minscale, to avoid zooming the whole map away to a point? 0.1 perhaps?

Makes sense!
(I'll have a look tomorrow. It's getting late her in europe 😴)


if(maxscale < 0) maxscale = Infinity;
var newScale = (val === 'in') ? 2 * scale : 0.5 * scale;

// make sure the scale is within the min/max bounds
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2 changes: 1 addition & 1 deletion src/plots/geo/layout_attributes.js
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Expand Up @@ -190,7 +190,7 @@ var attrs = module.exports = overrideAll({
maxscale: {
valType: 'number',
min: 0,
dflt: null,
dflt: -1,
description: [
'Maximal zoom level of the map view.',
'A maxScale of *2* (200%) corresponds to a zoom level',
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