# 数学文本

> 了解 Aspose.Slides for Android 的 MathematicalText 示例：使用 Java 在 PPT、PPTX 和 ODP 演示文稿中创建和格式化公式、分数、矩阵和符号。

Source: https://docs.aspose.com/slides/zh/androidjava/examples/elements/math-text/
Updated: 2026-02-19

本文演示了使用 **Aspose.Slides for Android via Java** 处理数学文本形状和格式化公式的工作。

## **添加数学文本**

创建包含分数和勾股公式的数学形状。

```java
static void addMathText() {
    Presentation presentation = new Presentation();
    try {
        ISlide slide = presentation.getSlides().get_Item(0);

        // 在幻灯片上添加一个数学形状。
        IAutoShape mathShape = slide.getShapes().addMathShape(0, 0, 720, 150);

        // 访问数学段落。
        IParagraph paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
        IPortion textPortion = paragraph.getPortions().get_Item(0);
        IMathParagraph mathParagraph = ((MathPortion) textPortion).getMathParagraph();

        // 添加一个简单分数：x / y。
        IMathElement fraction = new MathematicalText("x").divide("y");
        mathParagraph.add(new MathBlock(fraction));

        // 添加公式：c² = a² + b²。
        IMathBlock mathBlock = new MathematicalText("c")
                .setSuperscript("2")
                .join("=")
                .join(new MathematicalText("a").setSuperscript("2"))
                .join("+")
                .join(new MathematicalText("b").setSuperscript("2"));
        mathParagraph.add(mathBlock);
    } finally {
        presentation.dispose();
    }
}
```

## **访问数学文本**

在幻灯片上定位包含数学段落的形状。

```java
static void accessMathText() {
    Presentation presentation = new Presentation("sample.pptx");
    try {
        ISlide slide = presentation.getSlides().get_Item(0);

        // 查找第一个包含数学段落的形状。
        IAutoShape mathShape = null;
        for (IShape shape : slide.getShapes()) {
            if (shape instanceof IAutoShape) {
                IAutoShape autoShape = (IAutoShape) shape;
                ITextFrame textFrame = autoShape.getTextFrame();
                if (textFrame != null) {
                    boolean hasMath = false;
                    for (IParagraph paragraph : textFrame.getParagraphs()) {
                        for (IPortion portion : paragraph.getPortions()) {
                            if (portion instanceof MathPortion) {
                                hasMath = true;
                                break;
                            }
                        }
                        if (hasMath) break;
                    }
                    if (hasMath) {
                        mathShape = autoShape;
                        break;
                    }
                }
            }
        }

        if (mathShape != null) {
            IParagraph paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
            IPortion textPortion = paragraph.getPortions().get_Item(0);
            IMathParagraph mathParagraph = ((MathPortion) textPortion).getMathParagraph();

            // 示例：创建一个分数（此处未添加）。
            IMathElement fraction = new MathematicalText("x").divide("y");

            // 根据需要使用 mathParagraph 或 fraction...
        }
    } finally {
        presentation.dispose();
    }
}
```

## **删除数学文本**

从幻灯片中删除数学形状。

```java
static void removeMathText() {
    Presentation presentation = new Presentation();
    try {
        ISlide slide = presentation.getSlides().get_Item(0);

        IAutoShape mathShape = slide.getShapes().addMathShape(50, 50, 100, 50);

        IParagraph paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
        IPortion textPortion = paragraph.getPortions().get_Item(0);
        IMathParagraph mathParagraph = ((MathPortion) textPortion).getMathParagraph();
        IMathElement fraction = new MathematicalText("x").divide("y");
        mathParagraph.add(new MathBlock(fraction));

        // 删除数学形状。
        slide.getShapes().remove(mathShape);
    } finally {
        presentation.dispose();
    }
}
```

## **格式化数学文本**

为数学部分设置字体属性。

```java
static void formatMathText() {
    Presentation presentation = new Presentation();
    try {
        ISlide slide = presentation.getSlides().get_Item(0);

        IAutoShape mathShape = slide.getShapes().addMathShape(50, 50, 100, 50);
        IParagraph paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
        IPortion textPortion = paragraph.getPortions().get_Item(0);
        IMathParagraph mathParagraph = ((MathPortion) textPortion).getMathParagraph();
        IMathElement fraction = new MathematicalText("x").divide("y");
        mathParagraph.add(new MathBlock(fraction));

        textPortion.getPortionFormat().setFontHeight(20);
    } finally {
        presentation.dispose();
    }
}
```