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/**
* @module echarts/chart/helper/LineDraw
*/
define(function (require) {
var graphic = require('../../util/graphic');
var LineGroup = require('./Line');
function isPointNaN(pt) {
return isNaN(pt[0]) || isNaN(pt[1]);
}
function lineNeedsDraw(pts) {
return !isPointNaN(pts[0]) && !isPointNaN(pts[1]);
}
/**
* @alias module:echarts/component/marker/LineDraw
* @constructor
*/
function LineDraw(ctor) {
this._ctor = ctor || LineGroup;
this.group = new graphic.Group();
}
var lineDrawProto = LineDraw.prototype;
/**
* @param {module:echarts/data/List} lineData
*/
lineDrawProto.updateData = function (lineData) {
var oldLineData = this._lineData;
var group = this.group;
var LineCtor = this._ctor;
lineData.diff(oldLineData)
.add(function (idx) {
if (!lineNeedsDraw(lineData.getItemLayout(idx))) {
return;
}
var lineGroup = new LineCtor(lineData, idx);
lineData.setItemGraphicEl(idx, lineGroup);
group.add(lineGroup);
})
.update(function (newIdx, oldIdx) {
var lineGroup = oldLineData.getItemGraphicEl(oldIdx);
if (!lineNeedsDraw(lineData.getItemLayout(newIdx))) {
group.remove(lineGroup);
return;
}
if (!lineGroup) {
lineGroup = new LineCtor(lineData, newIdx);
}
else {
lineGroup.updateData(lineData, newIdx);
}
lineData.setItemGraphicEl(newIdx, lineGroup);
group.add(lineGroup);
})
.remove(function (idx) {
group.remove(oldLineData.getItemGraphicEl(idx));
})
.execute();
this._lineData = lineData;
};
lineDrawProto.updateLayout = function () {
var lineData = this._lineData;
lineData.eachItemGraphicEl(function (el, idx) {
el.updateLayout(lineData, idx);
}, this);
};
lineDrawProto.remove = function () {
this.group.removeAll();
};
return LineDraw;
});