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autoSkip: properly calculate space needed by tick label #5922

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merged 2 commits into from Dec 21, 2018
Merged

autoSkip: properly calculate space needed by tick label #5922

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autoSkip: properly calculate space needed by tick label
kurkle Dec 17, 2018
ed96328
use helpers.options._parseFont
kurkle Dec 20, 2018
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50 changes: 37 additions & 13 deletions src/core/core.scale.js
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Expand Up @@ -415,6 +415,9 @@ module.exports = Element.extend({
var lineSpace = tickFont.size * 0.5;
var tickPadding = me.options.ticks.padding;

// Store max number of lines used in labels for _autoSkip
me._maxLabelLines = tallestLabelHeightInLines;

if (isHorizontal) {
// A horizontal axis is more constrained by the height.
me.longestLabelWidth = largestTextWidth;
Expand Down Expand Up @@ -616,9 +619,32 @@ module.exports = Element.extend({
var isHorizontal = me.isHorizontal();
var optionTicks = me.options.ticks.minor;
var tickCount = ticks.length;
var labelRotationRadians = helpers.toRadians(me.labelRotation);
var cosRotation = Math.cos(labelRotationRadians);
var longestRotatedLabel = me.longestLabelWidth * cosRotation;

// Calculate space needed by label in axis direction.
var rot = helpers.toRadians(me.labelRotation);
var cos = Math.abs(Math.cos(rot));
var sin = Math.abs(Math.sin(rot));

var padding = optionTicks.autoSkipPadding;
var w = me.longestLabelWidth + padding || 0;
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var tickFont = helpers.options._parseFont(optionTicks);
var h = me._maxLabelLines * tickFont.lineHeight + padding;

// Calculate space needed for 1 tick in axis direction.
var tickSize = isHorizontal
? h * cos > w * sin ? w / cos : h / sin
: h * sin < w * cos ? h / cos : w / sin;

// Total space needed to display all ticks. First and last ticks are
// drawn as their center at end of axis, so tickCount-1
var ticksLength = tickSize * (tickCount - 1);

// Axis length
var axisLength = isHorizontal
? me.width - (me.paddingLeft + me.paddingRight)
: me.height - (me.paddingTop + me.PaddingBottom);

var result = [];
var i, tick;

Expand All @@ -628,18 +654,16 @@ module.exports = Element.extend({
maxTicks = optionTicks.maxTicksLimit;
}

if (isHorizontal) {
skipRatio = false;
skipRatio = false;

if ((longestRotatedLabel + optionTicks.autoSkipPadding) * tickCount > (me.width - (me.paddingLeft + me.paddingRight))) {
skipRatio = 1 + Math.floor(((longestRotatedLabel + optionTicks.autoSkipPadding) * tickCount) / (me.width - (me.paddingLeft + me.paddingRight)));
}
if (ticksLength > axisLength) {
skipRatio = 1 + Math.floor(ticksLength / axisLength);
}

// if they defined a max number of optionTicks,
// increase skipRatio until that number is met
if (maxTicks && tickCount > maxTicks) {
skipRatio = Math.max(skipRatio, Math.floor(tickCount / maxTicks));
}
// if they defined a max number of optionTicks,
// increase skipRatio until that number is met
if (maxTicks && tickCount > maxTicks) {
skipRatio = Math.max(skipRatio, 1 + Math.floor(tickCount / maxTicks));
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}

for (i = 0; i < tickCount; i++) {
Expand Down
8 changes: 6 additions & 2 deletions test/specs/core.scale.tests.js
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Expand Up @@ -60,10 +60,14 @@ describe('Core.scale', function() {
labels: [
'January 2018', 'February 2018', 'March 2018', 'April 2018',
'May 2018', 'June 2018', 'July 2018', 'August 2018',
'September 2018', 'October 2018', 'November 2018', 'December 2018'
'September 2018', 'October 2018', 'November 2018', 'December 2018',
'January 2019', 'February 2019', 'March 2019', 'April 2019',
'May 2019', 'June 2019', 'July 2019', 'August 2019',
'September 2019', 'October 2019', 'November 2019', 'December 2019',
'January 2020', 'February 2020'
],
datasets: [{
data: [12, 19, 3, 5, 2, 3, 7, 8, 9, 10, 11, 12]
data: [12, 19, 3, 5, 2, 3, 7, 8, 9, 10, 11, 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
}]
});

Expand Down