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define(function (require) {
var numberUtil = require('../util/number');
var linearMap = numberUtil.linearMap;
var zrUtil = require('zrender/core/util');
function fixExtentWithBands(extent, nTick) {
var size = extent[1] - extent[0];
var len = nTick;
var margin = size / len / 2;
extent[0] += margin;
extent[1] -= margin;
}
var normalizedExtent = [0, 1];
/**
* @name module:echarts/coord/CartesianAxis
* @constructor
*/
var Axis = function (dim, scale, extent) {
/**
* Axis dimension. Such as 'x', 'y', 'z', 'angle', 'radius'
* @type {string}
*/
this.dim = dim;
/**
* Axis scale
* @type {module:echarts/coord/scale/*}
*/
this.scale = scale;
/**
* @type {Array.}
* @private
*/
this._extent = extent || [0, 0];
/**
* @type {boolean}
*/
this.inverse = false;
/**
* Usually true when axis has a ordinal scale
* @type {boolean}
*/
this.onBand = false;
};
Axis.prototype = {
constructor: Axis,
/**
* If axis extent contain given coord
* @param {number} coord
* @return {boolean}
*/
contain: function (coord) {
var extent = this._extent;
var min = Math.min(extent[0], extent[1]);
var max = Math.max(extent[0], extent[1]);
return coord >= min && coord <= max;
},
/**
* If axis extent contain given data
* @param {number} data
* @return {boolean}
*/
containData: function (data) {
return this.contain(this.dataToCoord(data));
},
/**
* Get coord extent.
* @return {Array.}
*/
getExtent: function () {
var ret = this._extent.slice();
return ret;
},
/**
* Get precision used for formatting
* @param {Array.} [dataExtent]
* @return {number}
*/
getPixelPrecision: function (dataExtent) {
return numberUtil.getPixelPrecision(
dataExtent || this.scale.getExtent(),
this._extent
);
},
/**
* Set coord extent
* @param {number} start
* @param {number} end
*/
setExtent: function (start, end) {
var extent = this._extent;
extent[0] = start;
extent[1] = end;
},
/**
* Convert data to coord. Data is the rank if it has a ordinal scale
* @param {number} data
* @param {boolean} clamp
* @return {number}
*/
dataToCoord: function (data, clamp) {
var extent = this._extent;
var scale = this.scale;
data = scale.normalize(data);
if (this.onBand && scale.type === 'ordinal') {
extent = extent.slice();
fixExtentWithBands(extent, scale.count());
}
return linearMap(data, normalizedExtent, extent, clamp);
},
/**
* Convert coord to data. Data is the rank if it has a ordinal scale
* @param {number} coord
* @param {boolean} clamp
* @return {number}
*/
coordToData: function (coord, clamp) {
var extent = this._extent;
var scale = this.scale;
if (this.onBand && scale.type === 'ordinal') {
extent = extent.slice();
fixExtentWithBands(extent, scale.count());
}
var t = linearMap(coord, extent, normalizedExtent, clamp);
return this.scale.scale(t);
},
/**
* @return {Array.}
*/
getTicksCoords: function () {
if (this.onBand) {
var bands = this.getBands();
var coords = [];
for (var i = 0; i < bands.length; i++) {
coords.push(bands[i][0]);
}
if (bands[i - 1]) {
coords.push(bands[i - 1][1]);
}
return coords;
}
else {
return zrUtil.map(this.scale.getTicks(), this.dataToCoord, this);
}
},
/**
* Coords of labels are on the ticks or on the middle of bands
* @return {Array.}
*/
getLabelsCoords: function () {
if (this.onBand) {
var bands = this.getBands();
var coords = [];
var band;
for (var i = 0; i < bands.length; i++) {
band = bands[i];
coords.push((band[0] + band[1]) / 2);
}
return coords;
}
else {
return zrUtil.map(this.scale.getTicks(), this.dataToCoord, this);
}
},
/**
* Get bands.
*
* If axis has labels [1, 2, 3, 4]. Bands on the axis are
* |---1---|---2---|---3---|---4---|.
*
* @return {Array}
*/
// FIXME Situation when labels is on ticks
getBands: function () {
var extent = this.getExtent();
var bands = [];
var len = this.scale.count();
var start = extent[0];
var end = extent[1];
var span = end - start;
for (var i = 0; i < len; i++) {
bands.push([
span * i / len + start,
span * (i + 1) / len + start
]);
}
return bands;
},
/**
* Get width of band
* @return {number}
*/
getBandWidth: function () {
var axisExtent = this._extent;
var dataExtent = this.scale.getExtent();
var len = dataExtent[1] - dataExtent[0] + (this.onBand ? 1 : 0);
// Fix #2728, avoid NaN when only one data.
len === 0 && (len = 1);
var size = Math.abs(axisExtent[1] - axisExtent[0]);
return Math.abs(size) / len;
}
};
return Axis;
});
