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/**
* @module echarts/chart/helper/SymbolDraw
*/
define(function (require) {
var graphic = require('../../util/graphic');
var Symbol = require('./Symbol');
/**
* @constructor
* @alias module:echarts/chart/helper/SymbolDraw
* @param {module:zrender/graphic/Group} [symbolCtor]
*/
function SymbolDraw(symbolCtor) {
this.group = new graphic.Group();
this._symbolCtor = symbolCtor || Symbol;
}
var symbolDrawProto = SymbolDraw.prototype;
function symbolNeedsDraw(data, idx, isIgnore) {
var point = data.getItemLayout(idx);
return point && !isNaN(point[0]) && !isNaN(point[1]) && !(isIgnore && isIgnore(idx))
&& data.getItemVisual(idx, 'symbol') !== 'none';
}
/**
* Update symbols draw by new data
* @param {module:echarts/data/List} data
* @param {Array.<boolean>} [isIgnore]
*/
symbolDrawProto.updateData = function (data, isIgnore) {
var group = this.group;
var seriesModel = data.hostModel;
var oldData = this._data;
var SymbolCtor = this._symbolCtor;
data.diff(oldData)
.add(function (newIdx) {
var point = data.getItemLayout(newIdx);
if (symbolNeedsDraw(data, newIdx, isIgnore)) {
var symbolEl = new SymbolCtor(data, newIdx);
symbolEl.attr('position', point);
data.setItemGraphicEl(newIdx, symbolEl);
group.add(symbolEl);
}
})
.update(function (newIdx, oldIdx) {
var symbolEl = oldData.getItemGraphicEl(oldIdx);
var point = data.getItemLayout(newIdx);
if (!symbolNeedsDraw(data, newIdx, isIgnore)) {
group.remove(symbolEl);
return;
}
if (!symbolEl) {
symbolEl = new SymbolCtor(data, newIdx);
symbolEl.attr('position', point);
}
else {
symbolEl.updateData(data, newIdx);
graphic.updateProps(symbolEl, {
position: point
}, seriesModel);
}
// Add back
group.add(symbolEl);
data.setItemGraphicEl(newIdx, symbolEl);
})
.remove(function (oldIdx) {
var el = oldData.getItemGraphicEl(oldIdx);
el && el.fadeOut(function () {
group.remove(el);
});
})
.execute();
this._data = data;
};
symbolDrawProto.updateLayout = function () {
var data = this._data;
if (data) {
// Not use animation
data.eachItemGraphicEl(function (el, idx) {
el.attr('position', data.getItemLayout(idx));
});
}
};
symbolDrawProto.remove = function (enableAnimation) {
var group = this.group;
var data = this._data;
if (data) {
if (enableAnimation) {
data.eachItemGraphicEl(function (el) {
el.fadeOut(function () {
group.remove(el);
});
});
}
else {
group.removeAll();
}
}
};
return SymbolDraw;
});