使用 PHP 在演示文稿中管理图表数据标签
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图表中的数据标签显示有关图表数据系列或单个数据点的详细信息。它们使读者能够快速识别数据系列，并且还能使图表更易于理解。
在图表数据标签中设置数据精度
此 PHP 代码演示了如何在图表数据标签中设置数据精度：
$pres = new Presentation();
try {
$chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Line, 50, 50, 450, 300);
$chart->setDataTable(true);
$chart->getChartData()->getSeries()->get_Item(0)->setNumberFormatOfValues("#,##0.00");
$pres->save("output.pptx", SaveFormat::Pptx);
} finally {
if (!java_is_null($pres)) {
$pres->dispose();
}
}
将百分比显示为标签
Aspose.Slides for PHP via Java 允许您在显示的图表上设置百分比标签。此 PHP 代码演示了该操作：
# 创建 Presentation 类的实例
$pres = new Presentation();
try {
# 获取第一张幻灯片
$slide = $pres->getSlides()->get_Item(0);
$chart = $slide->getShapes()->addChart(ChartType::StackedColumn, 20, 20, 400, 400);
$series;
$total_for_Cat = new double[$chart->getChartData()->getCategories()->size()];
for($k = 0; $k < java_values($chart->getChartData()->getCategories()->size()) ; $k++) {
$cat = $chart->getChartData()->getCategories()->get_Item($k);
for($i = 0; $i < java_values($chart->getChartData()->getSeries()->size()) ; $i++) {
$total_for_Cat[$k] = $total_for_Cat[$k] + $chart->getChartData()->getSeries()->get_Item($i)->getDataPoints()->get_Item($k)->getValue()->getData();
}
}
$dataPontPercent = 0.0;
for($x = 0; $x < java_values($chart->getChartData()->getSeries()->size()) ; $x++) {
$series = $chart->getChartData()->getSeries()->get_Item($x);
$series->getLabels()->getDefaultDataLabelFormat()->setShowLegendKey(false);
for($j = 0; $j < java_values($series->getDataPoints()->size()) ; $j++) {
$lbl = $series->getDataPoints()->get_Item($j)->getLabel();
$dataPontPercent = $series->getDataPoints()->get_Item($j)->getValue()->getData() / $total_for_Cat[$j] * 100;
$port = new Portion();
$port->setText(sprintf("{0:F2} %.2f", $dataPontPercent));
$port->getPortionFormat()->setFontHeight(8.0);
$lbl->getTextFrameForOverriding()->setText("");
$para = $lbl->getTextFrameForOverriding()->getParagraphs()->get_Item(0);
$para->getPortions()->add($port);
$lbl->getDataLabelFormat()->setShowSeriesName(false);
$lbl->getDataLabelFormat()->setShowPercentage(false);
$lbl->getDataLabelFormat()->setShowLegendKey(false);
$lbl->getDataLabelFormat()->setShowCategoryName(false);
$lbl->getDataLabelFormat()->setShowBubbleSize(false);
}
}
# 保存包含图表的演示文稿
$pres->save("output.pptx", SaveFormat::Pptx);
} finally {
if (!java_is_null($pres)) {
$pres->dispose();
}
}
在图表数据标签中设置百分号
此 PHP 代码演示如何为图表数据标签设置百分号：
# 创建 Presentation 类的实例
$pres = new Presentation();
try {
# 获取通过索引的幻灯片引用
$slide = $pres->getSlides()->get_Item(0);
# 在幻灯片上创建 PercentsStackedColumn 图表
$chart = $slide->getShapes()->addChart(ChartType::PercentsStackedColumn, 20, 20, 500, 400);
# 将 NumberFormatLinkedToSource 设置为 false
$chart->getAxes()->getVerticalAxis()->setNumberFormatLinkedToSource(false);
$chart->getAxes()->getVerticalAxis()->setNumberFormat("0.00%");
$chart->getChartData()->getSeries()->clear();
$defaultWorksheetIndex = 0;
# 获取图表数据工作表
$workbook = $chart->getChartData()->getChartDataWorkbook();
# 添加新系列
$series = $chart->getChartData()->getSeries()->add($workbook->getCell($defaultWorksheetIndex, 0, 1, "Reds"), $chart->getType());
$series->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 1, 1, 0.3));
$series->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 2, 1, 0.5));
$series->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 3, 1, 0.8));
$series->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 4, 1, 0.65));
# 设置系列的填充颜色
$series->getFormat()->getFill()->setFillType(FillType::Solid);
$series->getFormat()->getFill()->getSolidFillColor()->setColor(java("java.awt.Color")->RED);
# 设置 LabelFormat 属性
$series->getLabels()->getDefaultDataLabelFormat()->setShowValue(true);
$series->getLabels()->getDefaultDataLabelFormat()->setNumberFormatLinkedToSource(false);
$series->getLabels()->getDefaultDataLabelFormat()->setNumberFormat("0.0%");
$series->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->setFontHeight(10);
$series->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->getFillFormat()->setFillType(FillType::Solid);
$series->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->getFillFormat()->getSolidFillColor()->setColor(java("java.awt.Color")->WHITE);
$series->getLabels()->getDefaultDataLabelFormat()->setShowValue(true);
# 添加新系列
$series2 = $chart->getChartData()->getSeries()->add($workbook->getCell($defaultWorksheetIndex, 0, 2, "Blues"), $chart->getType());
$series2->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 1, 2, 0.7));
$series2->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 2, 2, 0.5));
$series2->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 3, 2, 0.2));
$series2->getDataPoints()->addDataPointForBarSeries($workbook->getCell($defaultWorksheetIndex, 4, 2, 0.35));
# 设置填充类型和颜色
$series2->getFormat()->getFill()->setFillType(FillType::Solid);
$series2->getFormat()->getFill()->getSolidFillColor()->setColor(java("java.awt.Color")->BLUE);
$series2->getLabels()->getDefaultDataLabelFormat()->setShowValue(true);
$series2->getLabels()->getDefaultDataLabelFormat()->setNumberFormatLinkedToSource(false);
$series2->getLabels()->getDefaultDataLabelFormat()->setNumberFormat("0.0%");
$series2->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->setFontHeight(10);
$series2->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->getFillFormat()->setFillType(FillType::Solid);
$series2->getLabels()->getDefaultDataLabelFormat()->getTextFormat()->getPortionFormat()->getFillFormat()->getSolidFillColor()->setColor(java("java.awt.Color")->WHITE);
# 将演示文稿写入磁盘
$pres->save("SetDataLabelsPercentageSign_out.pptx", SaveFormat::Pptx);
} finally {
if (!java_is_null($pres)) {
$pres->dispose();
}
}
设置标签与轴的距离
此 PHP 代码演示在处理基于坐标轴绘制的图表时，如何设置标签与类别轴的距离：
# 创建 Presentation 类的实例
$pres = new Presentation();
try {
# 获取幻灯片的引用
$sld = $pres->getSlides()->get_Item(0);
# 在幻灯片上创建图表
$ch = $sld->getShapes()->addChart(ChartType::ClusteredColumn, 20, 20, 500, 300);
# 设置标签与轴的距离
$ch->getAxes()->getHorizontalAxis()->setLabelOffset(500);
# 将演示文稿写入磁盘
$pres->save("output.pptx", SaveFormat::Pptx);
} finally {
if (!java_is_null($pres)) {
$pres->dispose();
}
}
调整标签位置
当您创建不依赖任何坐标轴的图表（例如饼图）时，图表的数据标签可能会过于靠近边缘。在这种情况下，必须调整数据标签的位置，以便清晰显示引线。
此 PHP 代码演示如何在饼图上调整标签位置：
$pres = new Presentation();
try {
$chart = $pres->getSlides()->get_Item(0)->getShapes()->addChart(ChartType::Pie, 50, 50, 200, 200);
$series = $chart->getChartData()->getSeries();
$label = $series->get_Item(0)->getLabels()->get_Item(0);
$label->getDataLabelFormat()->setShowValue(true);
$label->getDataLabelFormat()->setPosition(LegendDataLabelPosition->OutsideEnd);
$label->setX(0.71);
$label->setY(0.04);
$pres->save("pres.pptx", SaveFormat::Pptx);
} finally {
if (!java_is_null($pres)) {
$pres->dispose();
}
}
常见问题
如何防止在密集图表上数据标签重叠？
结合自动标签放置、引线以及减小字体大小；必要时隐藏某些字段（例如类别），或仅对极值/关键点显示标签。
如何仅对零、负值或空值禁用标签？
在启用标签前过滤数据点，并依据定义的规则关闭对值为 0、负值或缺失值的显示。
如何在导出为 PDF/图像时确保标签样式一致？
显式设置字体（系列、大小），并确认渲染端已安装该字体以避免回退。