当我尝试使用以下代码反转轴时，我没有获得反向

Question

When I try to reverse the axis with the following code I do not obtain the reverse orientation

$chart1->getChartAxisX()->setAxisOrientation(Axis::ORIENTATION_REVERSED);

How to change the coordinate axis from small to large?

Answer 1

My guess is that you want the data sources to appear in the table in the same order as the bar chart, and your graph is a horizontal bar, so your code is fine, and it does invert the X-axis. But why doesn't it work, and so I looked at the source code. The code for getChartAxisX() in your method looks like this

    public function getChartAxisX()
    {
        if ($this->xAxis !== null) {
            return $this->xAxis;
        }

        return new Axis();
    }

As you can see, when the member variable xAxis does not exist, this method creates a new object and returns it. But this new object is not set into the $chart object, so your set method does not work on the $chart object.

However, I have found that Chart does not have a setXAxis() method in PhpSpreadsheet, so if you want it to work, you should set the Axis object in when you create the $chart object.

$axisX = new Axis();
$axisX->setAxisOrientation(Axis::ORIENTATION_REVERSED);
$chart = new Chart(
    "chart", // name
    $title, // title
    $legend, // legend
    $plotArea, // plotArea
    true, // plotVisibleOnly
    DataSeries::EMPTY_AS_GAP, // displayBlanksAs null,
    $xAxisLabel, // xAxisLabel - Owen added null xAxisLabel
    $yAxisLabel, // yAxisLabel
    $axisX //xAxis
);

Now it should do what you want.