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/**
* // Scale class management
* @module echarts/scale/Scale
*/
define(function (require) {
var clazzUtil = require('../util/clazz');
function Scale() {
/**
* Extent
* @type {Array.<number>}
* @protected
*/
this._extent = [Infinity, -Infinity];
/**
* Step is calculated in adjustExtent
* @type {Array.<number>}
* @protected
*/
this._interval = 0;
this.init && this.init.apply(this, arguments);
}
var scaleProto = Scale.prototype;
/**
* Parse input val to valid inner number.
* @param {*} val
* @return {number}
*/
scaleProto.parse = function (val) {
// Notice: This would be a trap here, If the implementation
// of this method depends on extent, and this method is used
// before extent set (like in dataZoom), it would be wrong.
// Nevertheless, parse does not depend on extent generally.
return val;
};
scaleProto.contain = function (val) {
var extent = this._extent;
return val >= extent[0] && val <= extent[1];
};
/**
* Normalize value to linear [0, 1], return 0.5 if extent span is 0
* @param {number} val
* @return {number}
*/
scaleProto.normalize = function (val) {
var extent = this._extent;
if (extent[1] === extent[0]) {
return 0.5;
}
return (val - extent[0]) / (extent[1] - extent[0]);
};
/**
* Scale normalized value
* @param {number} val
* @return {number}
*/
scaleProto.scale = function (val) {
var extent = this._extent;
return val * (extent[1] - extent[0]) + extent[0];
};
/**
* Set extent from data
* @param {Array.<number>} other
*/
scaleProto.unionExtent = function (other) {
var extent = this._extent;
other[0] < extent[0] && (extent[0] = other[0]);
other[1] > extent[1] && (extent[1] = other[1]);
// not setExtent because in log axis it may transformed to power
// this.setExtent(extent[0], extent[1]);
};
/**
* Get extent
* @return {Array.<number>}
*/
scaleProto.getExtent = function () {
return this._extent.slice();
};
/**
* Set extent
* @param {number} start
* @param {number} end
*/
scaleProto.setExtent = function (start, end) {
var thisExtent = this._extent;
if (!isNaN(start)) {
thisExtent[0] = start;
}
if (!isNaN(end)) {
thisExtent[1] = end;
}
};
/**
* @return {Array.<string>}
*/
scaleProto.getTicksLabels = function () {
var labels = [];
var ticks = this.getTicks();
for (var i = 0; i < ticks.length; i++) {
labels.push(this.getLabel(ticks[i]));
}
return labels;
};
clazzUtil.enableClassExtend(Scale);
clazzUtil.enableClassManagement(Scale, {
registerWhenExtend: true
});
return Scale;
});