/**
* @module echarts/coord/polar/Polar
*/
define(function(require) {
'use strict';
var RadiusAxis = require('./RadiusAxis');
var AngleAxis = require('./AngleAxis');
/**
* @alias {module:echarts/coord/polar/Polar}
* @constructor
* @param {string} name
*/
var Polar = function (name) {
/**
* @type {string}
*/
this.name = name || '';
/**
* x of polar center
* @type {number}
*/
this.cx = 0;
/**
* y of polar center
* @type {number}
*/
this.cy = 0;
/**
* @type {module:echarts/coord/polar/RadiusAxis}
* @private
*/
this._radiusAxis = new RadiusAxis();
/**
* @type {module:echarts/coord/polar/AngleAxis}
* @private
*/
this._angleAxis = new AngleAxis();
};
Polar.prototype = {
constructor: Polar,
type: 'polar',
/**
* @param {Array.<string>}
* @readOnly
*/
dimensions: ['radius', 'angle'],
/**
* If contain coord
* @param {Array.<number>} point
* @return {boolean}
*/
containPoint: function (point) {
var coord = this.pointToCoord(point);
return this._radiusAxis.contain(coord[0])
&& this._angleAxis.contain(coord[1]);
},
/**
* If contain data
* @param {Array.<number>} data
* @return {boolean}
*/
containData: function (data) {
return this._radiusAxis.containData(data[0])
&& this._angleAxis.containData(data[1]);
},
/**
* @param {string} axisType
* @return {module:echarts/coord/polar/AngleAxis|module:echarts/coord/polar/RadiusAxis}
*/
getAxis: function (axisType) {
return this['_' + axisType + 'Axis'];
},
/**
* Get axes by type of scale
* @param {string} scaleType
* @return {module:echarts/coord/polar/AngleAxis|module:echarts/coord/polar/RadiusAxis}
*/
getAxesByScale: function (scaleType) {
var axes = [];
var angleAxis = this._angleAxis;
var radiusAxis = this._radiusAxis;
angleAxis.scale.type === scaleType && axes.push(angleAxis);
radiusAxis.scale.type === scaleType && axes.push(radiusAxis);
return axes;
},
/**
* @return {module:echarts/coord/polar/AngleAxis}
*/
getAngleAxis: function () {
return this._angleAxis;
},
/**
* @return {module:echarts/coord/polar/RadiusAxis}
*/
getRadiusAxis: function () {
return this._radiusAxis;
},
/**
* @param {module:echarts/coord/polar/Axis}
* @return {module:echarts/coord/polar/Axis}
*/
getOtherAxis: function (axis) {
var angleAxis = this._angleAxis;
return axis === angleAxis ? this._radiusAxis : angleAxis;
},
/**
* Base axis will be used on stacking.
*
* @return {module:echarts/coord/polar/Axis}
*/
getBaseAxis: function () {
return this.getAxesByScale('ordinal')[0]
|| this.getAxesByScale('time')[0]
|| this.getAngleAxis();
},
/**
* Convert series data to a list of (x, y) points
* @param {module:echarts/data/List} data
* @return {Array}
* Return list of coordinates. For example:
* `[[10, 10], [20, 20], [30, 30]]`
*/
dataToPoints: function (data) {
return data.mapArray(this.dimensions, function (radius, angle) {
return this.dataToPoint([radius, angle]);
}, this);
},
/**
* Convert a single data item to (x, y) point.
* Parameter data is an array which the first element is radius and the second is angle
* @param {Array.<number>} data
* @param {boolean} [clamp=false]
* @return {Array.<number>}
*/
dataToPoint: function (data, clamp) {
return this.coordToPoint([
this._radiusAxis.dataToRadius(data[0], clamp),
this._angleAxis.dataToAngle(data[1], clamp)
]);
},
/**
* Convert a (x, y) point to data
* @param {Array.<number>} point
* @param {boolean} [clamp=false]
* @return {Array.<number>}
*/
pointToData: function (point, clamp) {
var coord = this.pointToCoord(point);
return [
this._radiusAxis.radiusToData(coord[0], clamp),
this._angleAxis.angleToData(coord[1], clamp)
];
},
/**
* Convert a (x, y) point to (radius, angle) coord
* @param {Array.<number>} point
* @return {Array.<number>}
*/
pointToCoord: function (point) {
var dx = point[0] - this.cx;
var dy = point[1] - this.cy;
var angleAxis = this.getAngleAxis();
var extent = angleAxis.getExtent();
var minAngle = Math.min(extent[0], extent[1]);
var maxAngle = Math.max(extent[0], extent[1]);
// Fix fixed extent in polarCreator
// FIXME
angleAxis.inverse
? (minAngle = maxAngle - 360)
: (maxAngle = minAngle + 360);
var radius = Math.sqrt(dx * dx + dy * dy);
dx /= radius;
dy /= radius;
var radian = Math.atan2(-dy, dx) / Math.PI * 180;
// move to angleExtent
var dir = radian < minAngle ? 1 : -1;
while (radian < minAngle || radian > maxAngle) {
radian += dir * 360;
}
return [radius, radian];
},
/**
* Convert a (radius, angle) coord to (x, y) point
* @param {Array.<number>} coord
* @return {Array.<number>}
*/
coordToPoint: function (coord) {
var radius = coord[0];
var radian = coord[1] / 180 * Math.PI;
var x = Math.cos(radian) * radius + this.cx;
// Inverse the y
var y = -Math.sin(radian) * radius + this.cy;
return [x, y];
}
};
return Polar;
});
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