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Fixes Label Array Tick alignment and Centering #5248

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merged 4 commits into from Feb 9, 2018
Merged

Fixes Label Array Tick alignment and Centering #5248

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1f3fd82
Fixes array tick alignment and centering
MPierre9 Feb 7, 2018
ddcf3c5
Horizontal scale fix and update
MPierre9 Feb 8, 2018
5f1bc91
Equation Change
MPierre9 Feb 9, 2018
9368c8b
Updated equation
MPierre9 Feb 9, 2018
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10 changes: 8 additions & 2 deletions src/core/core.scale.js
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Expand Up @@ -857,11 +857,17 @@ module.exports = function(Chart) {

var label = itemToDraw.label;
if (helpers.isArray(label)) {
for (var i = 0, y = 0; i < label.length; ++i) {
var lineCount = label.length / 2;
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Should be var lineCount = label.length; and re-used in the for loop.

var lineHeight = tickFont.size * 1.5;
var y = 0;
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More concise notation:

var y = me.isHorizontal() ? 0 : -lineHeight * lineCount;

But also, I think you need lineHeight instead of tickFont.size

image

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When I do:
var lineCount = label.length / 2;
var lineHeight = tickFont.size * 1.5;
var y = me.isHorizontal() ? 0 : -lineHeight * lineCount;

I get:
lineheight

JSFiddle

Which seems just slightly off. I think the equation is missing something small or I'm doing it wrong.

if (!me.isHorizontal()) {
y = -tickFont.size * lineCount;
}
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We need to use the line height (not only the font size) and it would be easier and faster to translate y instead of translating the context?

var lineCount = label.length;
var lineHeight = tickFont.size * 1.5;
var y = - lineHeight * lineCount / 2;
var i = 0;

for (; i < lineCount; ++i) {
  context.fillText('' + label[i], 0, y);
  y += lineHeight;
}

for (var i = 0; i < label.length; ++i) {
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We should use lineCount instead of label.length

// We just make sure the multiline element is a string here..
context.fillText('' + label[i], 0, y);
// apply same lineSpacing as calculated @ L#320
y += (tickFont.size * 1.5);
y += lineHeight;
}
} else {
context.fillText(label, 0, 0);
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