图表轴

获取图表垂直轴的最大值

Aspose.Slides for PHP via Java 允许您获取垂直轴上的最小值和最大值。请按照以下步骤操作：

1. 创建一个 Presentation 类的实例。
2. 访问第一张幻灯片。
3. 添加一个带有默认数据的图表。
4. 获取轴上的实际最大值。
5. 获取轴上的实际最小值。
6. 获取轴上的实际主要单位。
7. 获取轴上的实际次要单位。
8. 获取轴上的实际主要单位刻度。
9. 获取轴上的实际次要单位刻度。

这个示例代码—上述步骤的实现—向您展示如何获取所需的值：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Area, 100, 100, 500, 350);
    $chart->validateChartLayout();
    $maxValue = $chart->getAxes()->getVerticalAxis()->getActualMaxValue();
    $minValue = $chart->getAxes()->getVerticalAxis()->getActualMinValue();
    $majorUnit = $chart->getAxes()->getHorizontalAxis()->getActualMajorUnit();
    $minorUnit = $chart->getAxes()->getHorizontalAxis()->getActualMinorUnit();
    # 保存演示文稿
    $pres->save("MaxValuesVerticalAxis_out.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

在轴之间交换数据

Aspose.Slides 允许您快速在轴之间交换数据—垂直轴（y轴）上的数据移动到水平轴（x轴），反之亦然。

以下 PHP 代码向您展示如何在图表的轴之间执行数据交换任务：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::ClusteredColumn, 100, 100, 400, 300);
    # 切换行和列
    $chart->getChartData()->switchRowColumn();
    # 保存演示文稿
    $pres->save("SwitchChartRowColumns_out.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

禁用线性图表的垂直轴

此 PHP 代码向您展示如何隐藏线性图表的垂直轴：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Line, 100, 100, 400, 300);
    $chart->getAxes()->getVerticalAxis()->setVisible(false);
    $pres->save("chart.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

禁用线性图表的水平轴

该代码向您展示如何隐藏线性图表的水平轴：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Line, 100, 100, 400, 300);
    $chart->getAxes()->getHorizontalAxis()->setVisible(false);
    $pres->save("chart.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

更改类别轴

使用 CategoryAxisType 属性，可以指定您首选的类别轴类型（日期或文本）。以下代码演示了该操作：

  $presentation = new Presentation("ExistingChart.pptx");
  try {
    $chart = $presentation->getSlides()->get_Item(0)->getShapes()->get_Item(0);
    $chart->getAxes()->getHorizontalAxis()->setCategoryAxisType(CategoryAxisType::Date);
    $chart->getAxes()->getHorizontalAxis()->setAutomaticMajorUnit(false);
    $chart->getAxes()->getHorizontalAxis()->setMajorUnit(1);
    $chart->getAxes()->getHorizontalAxis()->setMajorUnitScale(TimeUnitType::Months);
    $presentation->save("ChangeChartCategoryAxis_out.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($presentation)) {
      $presentation->dispose();
    }
  }

设置类别轴值的日期格式

Aspose.Slides for PHP via Java 允许您为类别轴值设置日期格式。以下 PHP 代码演示了该操作：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Area, 50, 50, 450, 300);
    $wb = $chart->getChartData()->getChartDataWorkbook();
    $wb->clear(0);
    $chart->getChartData()->getCategories()->clear();
    $chart->getChartData()->getSeries()->clear();
    $chart->getChartData()->getCategories()->add($wb->getCell(0, "A2", convertToOADate(new GregorianCalendar(2015, 1, 1))));
    $chart->getChartData()->getCategories()->add($wb->getCell(0, "A3", convertToOADate(new GregorianCalendar(2016, 1, 1))));
    $chart->getChartData()->getCategories()->add($wb->getCell(0, "A4", convertToOADate(new GregorianCalendar(2017, 1, 1))));
    $chart->getChartData()->getCategories()->add($wb->getCell(0, "A5", convertToOADate(new GregorianCalendar(2018, 1, 1))));
    $series = $chart->getChartData()->getSeries()->add(ChartType::Line);
    $series->getDataPoints()->addDataPointForLineSeries($wb->getCell(0, "B2", 1));
    $series->getDataPoints()->addDataPointForLineSeries($wb->getCell(0, "B3", 2));
    $series->getDataPoints()->addDataPointForLineSeries($wb->getCell(0, "B4", 3));
    $series->getDataPoints()->addDataPointForLineSeries($wb->getCell(0, "B5", 4));
    $chart->getAxes()->getHorizontalAxis()->setCategoryAxisType(CategoryAxisType::Date);
    $chart->getAxes()->getHorizontalAxis()->setNumberFormatLinkedToSource(false);
    $chart->getAxes()->getHorizontalAxis()->setNumberFormat("yyyy");
    $pres->save("output.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

设置图表轴标题的旋转角度

Aspose.Slides for PHP via Java 允许您设置图表轴标题的旋转角度。此 PHP 代码演示了该操作：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::ClusteredColumn, 50, 50, 450, 300);
    $chart->getAxes()->getVerticalAxis()->setTitle(true);
    $chart->getAxes()->getVerticalAxis()->getTitle()->getTextFormat()->getTextBlockFormat()->setRotationAngle(90);
    $pres->save("output.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

在类别轴或数值轴中设置位置轴

Aspose.Slides for PHP via Java 允许您在类别轴或数值轴中设置位置轴。以下 PHP 代码展示了如何执行该任务：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::ClusteredColumn, 50, 50, 450, 300);
    $chart->getAxes()->getHorizontalAxis()->setAxisBetweenCategories(true);
    $pres->save("output.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

启用图表数值轴上的显示单位标签

Aspose.Slides for PHP via Java 允许您配置图表以在其图表数值轴上显示单位标签。此 PHP 代码演示该操作：

  $pres = new Presentation();
  try {
    $chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::ClusteredColumn, 50, 50, 450, 300);
    $chart->getAxes()->getVerticalAxis()->setDisplayUnit(DisplayUnitType::Millions);
    $pres->save("output.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }