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Better log axis tick labeling with less label overlap for scatter plots #6120

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Better log axis tick labeling with less label overlap for scatter plots #6120

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5f3134f
PR according to stackoverflow.com/questions/70926979: nicer axis tick…
jensb Feb 15, 2022
a6a3ad1
Add 6120_change.md
jensb Feb 15, 2022
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3 changes: 3 additions & 0 deletions draftlogs/6120_change.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
This patch removes the single-digit small subtick labels for logarithmically scaled plots, and replaces them with normal sized multi-digit ticks (including SI extensions if enabled) at positions 2, 3, 5, and 7 - if space permits.

See https://stackoverflow.com/questions/70926979 for details.
17 changes: 15 additions & 2 deletions src/plots/cartesian/axes.js
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Expand Up @@ -557,7 +557,7 @@ axes.prepTicks = function(ax, opts) {
minPx = ax.tickfont ? Lib.bigFont(ax.tickfont.size || 12) : 15;
nt = ax._length / minPx;
} else {
minPx = ax._id.charAt(0) === 'y' ? 40 : 80;
minPx = ax._id.charAt(0) === 'y' ? 40 : 100;
nt = Lib.constrain(ax._length / minPx, 4, 9) + 1;
}

Expand Down Expand Up @@ -951,6 +951,8 @@ axes.calcTicks = function calcTicks(ax, opts) {
};

var ticksOut = [];
var skipText1 = /^[346789]/; // for x-axis and tick length >= 3
var skipText2 = /^[4689]/; // for tick length < 3
var t, p;
for(i = 0; i < tickVals.length; i++) {
var _minor = tickVals[i].minor;
Expand All @@ -976,6 +978,14 @@ axes.calcTicks = function calcTicks(ax, opts) {
}
}

if(ax.type == 'log' && ax.dtick == 'D1' && (
(ax._attr[0] == 'y' && t.text.match(skipText2))
|| (ax._attr[0] == 'x' && t.text.length < 3 && t.text.match(skipText2))
|| (ax._attr[0] == 'x' && t.text.length >=3 && t.text.match(skipText1))
)) {
hideLabel(t);
}

if(tickVals[i].skipLabel) {
hideLabel(t);
}
Expand Down Expand Up @@ -1129,11 +1139,14 @@ axes.autoTicks = function(ax, roughDTick) {
Math.pow(10, rng[0])) / nt;
base = getBase(10);
ax.dtick = 'L' + roundDTick(roughDTick, base, roundBase10);
ax.tickformat = '';
} else {
// include intermediates between powers of 10,
// labeled with small digits
// ax.dtick = "D2" (show 2 and 5) or "D1" (show all digits)
ax.dtick = (roughDTick > 0.3) ? 'D2' : 'D1';
ax.dtick = (roughDTick > 0.4) ? 'D2' : 'D1';
ax.tickformat = '0.1s';
ax.hoverformat = '0.2s'; // workaround to fix hoverinfo label formatting
}
} else if(ax.type === 'category' || ax.type === 'multicategory') {
ax.tick0 = 0;
Expand Down