forked from chartjs/Chart.js
/
scale.category.js
124 lines (99 loc) · 3.28 KB
/
scale.category.js
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'use strict';
var Scale = require('../core/core.scale');
var defaultConfig = {
position: 'bottom'
};
module.exports = Scale.extend({
determineDataLimits: function() {
var me = this;
var labels = me._getLabels();
me.minIndex = 0;
me.maxIndex = labels.length - 1;
var findIndex;
if (me.options.ticks.min !== undefined) {
// user specified min value
findIndex = labels.indexOf(me.options.ticks.min);
me.minIndex = findIndex !== -1 ? findIndex : me.minIndex;
}
if (me.options.ticks.max !== undefined) {
// user specified max value
findIndex = labels.indexOf(me.options.ticks.max);
me.maxIndex = findIndex !== -1 ? findIndex : me.maxIndex;
}
me.min = labels[me.minIndex];
me.max = labels[me.maxIndex];
},
buildTicks: function() {
var me = this;
var labels = me._getLabels();
// If we are viewing some subset of labels, slice the original array
me.ticks = (me.minIndex === 0 && me.maxIndex === labels.length - 1) ? labels : labels.slice(me.minIndex, me.maxIndex + 1);
},
getLabelForIndex: function(index, datasetIndex) {
var me = this;
var chart = me.chart;
if (chart.getDatasetMeta(datasetIndex).controller._getValueScaleId() === me.id) {
return me.getRightValue(chart.data.datasets[datasetIndex].data[index]);
}
return me.ticks[index - me.minIndex];
},
// Used to get data value locations. Value can either be an index or a numerical value
getPixelForValue: function(value, index) {
var me = this;
var offset = me.options.offset;
// 1 is added because we need the length but we have the indexes
var offsetAmt = Math.max((me.maxIndex + 1 - me.minIndex - (offset ? 0 : 1)), 1);
// If value is a data object, then index is the index in the data array,
// not the index of the scale. We need to change that.
var valueCategory;
if (value !== undefined && value !== null) {
valueCategory = me.isHorizontal() ? value.x : value.y;
}
if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
var labels = me._getLabels();
value = valueCategory || value;
var idx = labels.indexOf(value);
index = idx !== -1 ? idx : index;
}
if (me.isHorizontal()) {
var valueWidth = me.width / offsetAmt;
var widthOffset = (valueWidth * (index - me.minIndex));
if (offset) {
widthOffset += (valueWidth / 2);
}
return me.left + widthOffset;
}
var valueHeight = me.height / offsetAmt;
var heightOffset = (valueHeight * (index - me.minIndex));
if (offset) {
heightOffset += (valueHeight / 2);
}
return me.top + heightOffset;
},
getPixelForTick: function(index) {
return this.getPixelForValue(this.ticks[index], index + this.minIndex, null);
},
getValueForPixel: function(pixel) {
var me = this;
var offset = me.options.offset;
var value;
var offsetAmt = Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
var horz = me.isHorizontal();
var valueDimension = (horz ? me.width : me.height) / offsetAmt;
pixel -= horz ? me.left : me.top;
if (offset) {
pixel -= (valueDimension / 2);
}
if (pixel <= 0) {
value = 0;
} else {
value = Math.round(pixel / valueDimension);
}
return value + me.minIndex;
},
getBasePixel: function() {
return this.bottom;
}
});
// INTERNAL: static default options, registered in src/index.js
module.exports._defaults = defaultConfig;