This demo uses graph's useNegativeColorIfDown
property. If it's set to true
the chart will check values when drawing the line (or column). If the previous value is bigger than the current one, the segment of the line graph (or column) will be drawn using negativeLineColor
or negativeFillColors
settings.
var chart = AmCharts.makeChart( "chartdiv", { "type": "serial", // config skipped // ... "graphs": [ { "lineThickness": 3, "useNegativeColorIfDown": true, "negativeLineColor": "#c00", "valueField": "value" } ] } );