mirror of
https://github.com/chartjs/Chart.js.git
synced 2026-03-09 01:36:51 +01:00
254bd4bf86
* Fixed different calculation of scale min and max when dataset contains no values * Removed trailing spaces * Added test for correct min/max calculation * Removed trailing spaces
107 lines
2.8 KiB
JavaScript
107 lines
2.8 KiB
JavaScript
'use strict';
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module.exports = function(Chart) {
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var helpers = Chart.helpers,
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noop = helpers.noop;
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Chart.LinearScaleBase = Chart.Scale.extend({
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handleTickRangeOptions: function() {
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var me = this;
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var opts = me.options;
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var tickOpts = opts.ticks;
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// If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
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// do nothing since that would make the chart weird. If the user really wants a weird chart
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// axis, they can manually override it
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if (tickOpts.beginAtZero) {
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var minSign = helpers.sign(me.min);
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var maxSign = helpers.sign(me.max);
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if (minSign < 0 && maxSign < 0) {
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// move the top up to 0
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me.max = 0;
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} else if (minSign > 0 && maxSign > 0) {
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// move the bottom down to 0
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me.min = 0;
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}
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}
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if (tickOpts.min !== undefined) {
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me.min = tickOpts.min;
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} else if (tickOpts.suggestedMin !== undefined) {
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if (me.min === null) {
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me.min = tickOpts.suggestedMin;
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} else {
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me.min = Math.min(me.min, tickOpts.suggestedMin);
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}
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}
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if (tickOpts.max !== undefined) {
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me.max = tickOpts.max;
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} else if (tickOpts.suggestedMax !== undefined) {
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if (me.max === null) {
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me.max = tickOpts.suggestedMax;
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} else {
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me.max = Math.max(me.max, tickOpts.suggestedMax);
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}
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}
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if (me.min === me.max) {
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me.max++;
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if (!tickOpts.beginAtZero) {
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me.min--;
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}
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}
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},
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getTickLimit: noop,
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handleDirectionalChanges: noop,
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buildTicks: function() {
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var me = this;
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var opts = me.options;
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var tickOpts = opts.ticks;
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// Figure out what the max number of ticks we can support it is based on the size of
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// the axis area. For now, we say that the minimum tick spacing in pixels must be 50
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// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
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// the graph. Make sure we always have at least 2 ticks
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var maxTicks = me.getTickLimit();
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maxTicks = Math.max(2, maxTicks);
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var numericGeneratorOptions = {
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maxTicks: maxTicks,
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min: tickOpts.min,
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max: tickOpts.max,
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stepSize: helpers.getValueOrDefault(tickOpts.fixedStepSize, tickOpts.stepSize)
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};
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var ticks = me.ticks = Chart.Ticks.generators.linear(numericGeneratorOptions, me);
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me.handleDirectionalChanges();
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// At this point, we need to update our max and min given the tick values since we have expanded the
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// range of the scale
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me.max = helpers.max(ticks);
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me.min = helpers.min(ticks);
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if (tickOpts.reverse) {
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ticks.reverse();
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me.start = me.max;
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me.end = me.min;
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} else {
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me.start = me.min;
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me.end = me.max;
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}
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},
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convertTicksToLabels: function() {
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var me = this;
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me.ticksAsNumbers = me.ticks.slice();
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me.zeroLineIndex = me.ticks.indexOf(0);
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Chart.Scale.prototype.convertTicksToLabels.call(me);
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}
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});
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};
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