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POHighcharts.js setting a threshold value for changing column color
 

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    <p>I'm wondering if someone can help me adapt this Highcharts line graph: <a href="http://jsfiddle.net/highcharts/PMyHQ/" rel="nofollow">http://jsfiddle.net/highcharts/PMyHQ/</a> to a column graph <strong>WHILE</strong> still maintaining the threshold coloring (red for value>0; blue for value&lt;0).</p> <p>The problem is if you simply change the graph type, <code>type:'column'</code>, then the threshold-based coloring is lost and all the columns are blue.</p> <p>The function that does the color change is <code>applyGraphGradient()</code>. I can't figure out how to change this function to preserve the threshold-based coloring.</p> <pre><code>/** * Event handler for applying different colors above and below a threshold value. * Currently this only works in SVG capable browsers. A full solution is scheduled * for Highcharts 3.0. In the current example the data is static, so we don't need to * recompute after altering the data. In dynamic series, the same event handler * should be added to yAxis.events.setExtremes and possibly other events, like * chart.events.resize. */ function applyGraphGradient() { // Options var threshold = 0, colorAbove = '#EE4643', colorBelow = '#4572EE'; // internal var series = this.series[0], i, point; if (this.renderer.box.tagName === 'svg') { var translatedThreshold = series.yAxis.translate(threshold), y1 = Math.round(this.plotHeight - translatedThreshold), y2 = y1 + 2; // 0.01 would be fine, but IE9 requires 2 // Apply gradient to the path series.graph.attr({ stroke: { linearGradient: [0, y1, 0, y2], stops: [ [0, colorAbove], [1, colorBelow] ] } }); } // Apply colors to the markers for (i = 0; i &lt; series.data.length; i++) { point = series.data[i]; point.color = point.y &lt; threshold ? colorBelow : colorAbove; if (point.graphic) { point.graphic.attr({ fill: point.color }); } } // prevent the old color from coming back after hover delete series.pointAttr.hover.fill; delete series.pointAttr[''].fill; } // Initiate the chart var chart = new Highcharts.Chart({ chart: { renderTo: 'container', events: { load: applyGraphGradient }, defaultSeriesType : 'column' }, title: { text: 'Average monthly temperature' }, yAxis: { plotLines: [{ value: 0, color: 'silver', width: 2, zIndex: 2 }], title: { text: 'Temperature (°C)' } }, xAxis: { categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] }, series: [{ name: 'Temperature (°C)', data: [-2, -3, -2, 2, 5, 9, 11, 11, 10, 8, 4, -1] }] }); ​ </code></pre>
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