Current File : /home/tjamichg/cursos.tjamich.gob.mx/web/assets/chart.js/src/scales/scale.category.js
'use strict';
var helpers = require('../helpers/index');
var Scale = require('../core/core.scale');
var isNullOrUndef = helpers.isNullOrUndef;
var defaultConfig = {
position: 'bottom'
};
module.exports = Scale.extend({
determineDataLimits: function() {
var me = this;
var labels = me._getLabels();
var ticksOpts = me.options.ticks;
var min = ticksOpts.min;
var max = ticksOpts.max;
var minIndex = 0;
var maxIndex = labels.length - 1;
var findIndex;
if (min !== undefined) {
// user specified min value
findIndex = labels.indexOf(min);
if (findIndex >= 0) {
minIndex = findIndex;
}
}
if (max !== undefined) {
// user specified max value
findIndex = labels.indexOf(max);
if (findIndex >= 0) {
maxIndex = findIndex;
}
}
me.minIndex = minIndex;
me.maxIndex = maxIndex;
me.min = labels[minIndex];
me.max = labels[maxIndex];
},
buildTicks: function() {
var me = this;
var labels = me._getLabels();
var minIndex = me.minIndex;
var maxIndex = me.maxIndex;
// If we are viewing some subset of labels, slice the original array
me.ticks = (minIndex === 0 && maxIndex === labels.length - 1) ? labels : labels.slice(minIndex, 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._getLabels()[index];
},
_configure: function() {
var me = this;
var offset = me.options.offset;
var ticks = me.ticks;
Scale.prototype._configure.call(me);
if (!me.isHorizontal()) {
// For backward compatibility, vertical category scale reverse is inverted.
me._reversePixels = !me._reversePixels;
}
if (!ticks) {
return;
}
me._startValue = me.minIndex - (offset ? 0.5 : 0);
me._valueRange = Math.max(ticks.length - (offset ? 0 : 1), 1);
},
// Used to get data value locations. Value can either be an index or a numerical value
getPixelForValue: function(value, index, datasetIndex) {
var me = this;
var valueCategory, labels, idx;
if (!isNullOrUndef(index) && !isNullOrUndef(datasetIndex)) {
value = me.chart.data.datasets[datasetIndex].data[index];
}
// 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.
if (!isNullOrUndef(value)) {
valueCategory = me.isHorizontal() ? value.x : value.y;
}
if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
labels = me._getLabels();
value = helpers.valueOrDefault(valueCategory, value);
idx = labels.indexOf(value);
index = idx !== -1 ? idx : index;
if (isNaN(index)) {
index = value;
}
}
return me.getPixelForDecimal((index - me._startValue) / me._valueRange);
},
getPixelForTick: function(index) {
var ticks = this.ticks;
return index < 0 || index > ticks.length - 1
? null
: this.getPixelForValue(ticks[index], index + this.minIndex);
},
getValueForPixel: function(pixel) {
var me = this;
var value = Math.round(me._startValue + me.getDecimalForPixel(pixel) * me._valueRange);
return Math.min(Math.max(value, 0), me.ticks.length - 1);
},
getBasePixel: function() {
return this.bottom;
}
});
// INTERNAL: static default options, registered in src/index.js
module.exports._defaults = defaultConfig;
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