Question

我无法在AmStockChart上添加指示线我正在尝试在DataSet属性中添加多个AmStockChart.dataSets，如下所示：

....  
firstDataSet.fieldMappings = [
  { fromField: "open", toField: "open" },
  { fromField: "high", toField: "high" },
  { fromField: "low", toField: "low" },
  { fromField: "close", toField: "close" },
  { fromField: "volume", toField: "volume" }
];
....
secondDataSet.fieldMappings = [ { fromField: "value", toField: "value" } ];
....  
chart.dataSets = [ firstDataSet, secondDataSet ];

但是在图表初始化之后我只能看到第一个烛台图。

如何在AmStockChart上添加指标线？

Answer 1

@zeroin向我显示a good solution。无需添加新的DataSet。您可以使用现有的DataSet，但可以添加新的field，例如：

// exactly dataSet can be not first
// "indicator_" + i - field name
chart.dataSets[ 0 ].fieldMappings.push({
  fromField: "indicator_" + i,
  toField: "indicator_" + i
});

然后将计算出的value添加到其字段中：

for ( var j = 0; j < chart.dataSets[ 0 ].dataProvider.length; j ++ ) {
  // calculate value  
  chart.dataSets[ 0 ].dataProvider[ j ][ "indicator_" + i ] = value.toFixed( 4 );  
}

并将新StockGraph添加到StockPanel：

var indicatorGraph = new AmCharts.StockGraph();
indicatorGraph.valueField = "indicator_" + i;
indicatorGraph.useDataSetColors = false;
indicatorGraph.type = "smoothedLine";
stockPanel.addStockGraph( indicatorGraph );

然后拨打chart.validateNow();。

图表上的AmStockChart指标

1 个答案: