Highcharts reversed line chart is partially hidden at min value

问题

When using a reversed line chart with min and max values, the line is partially hidden at the min value. The problem is that the drawing canvas ends exactly at the min value line. When you have a line that is thick only part of it is visible there, the part that is lying above the min value line is hidden. You can see an example here. I tried different options to fix this but havent been successful. Is there a way you can increase the chart canvas on top?

This is the highcharts code:

$("#chart").highcharts({
  chart: {
  type: "line",
  spacingBottom: 30,
  height: 400,
  alignTicks: false,
  },
  credits: {
    enabled: false
  },
  legend: {
    enabled: false
  },
  title: {
    text: "Chart"
  },
  yAxis: [{
    title: null,
    reversed: true,
    showFirstLabel: true,
    allowDecimals: false,
    startOnTick: false,
    endOnTick: false,
    tickInterval: 5,
    minorTickInterval: 1,
    max: 10,
    min: 1,
  }],
  series: [{
    yAxis: 0,
    data: [6,2,2,1,1,1,1,1,1,1,1,1,1,2,2,1,1,2,2,2,2,2],
    lineWidth: 10, 
    marker: {
      enabled: false
    }
  }]
});

回答1:

The min: 0.9 works well unless you have tickPositions set as well without startOnTick set. If you are setting tickPositions, then look at adding startOnTick: false to the yAxis as well.

回答2:

I'm not sure why this is a problem - you have set strict min value for yAxis, so chart is forced to cut off that line, remove that option, and this will work perfectly fine: http://jsfiddle.net/DruGa/5/

来源：https://stackoverflow.com/questions/18047958/highcharts-reversed-line-chart-is-partially-hidden-at-min-value