如何使用 Apache POI 在 PPT 上编写折线图

Question

有一个很好的例子展示如何使用apache POI在PPT上绘制折线图吗？

我正在使用 apache POIs XSLFSlide 生成 PPT。我没有看到使用 XSLFSlide 绘制线条的示例。

Answer 1

总的来说，这个条形图具有相同的概念。改成多行就好了

 public static void main(String[] args) throws Exception {
    HSLFSlideShow ppt = new HSLFSlideShow();

    try {
        //bar chart data. The first value is the bar color, the second is the width
        Object[] def = new Object[]{
            Color.yellow, 40,
            Color.green, 60,
            Color.gray, 30,
            Color.red, 80,
        };

        HSLFSlide slide = ppt.createSlide();

        HSLFGroupShape group = new HSLFGroupShape();
        //define position of the drawing in the slide
        Rectangle bounds = new java.awt.Rectangle(200, 100, 350, 300);
        group.setAnchor(bounds);
        group.setInteriorAnchor(new java.awt.Rectangle(0, 0, 100, 100));
        slide.addShape(group);
        Graphics2D graphics = new PPGraphics2D(group);

        //draw a simple bar graph
        int x = 10, y = 10;
        graphics.setFont(new Font("Arial", Font.BOLD, 10));
        for (int i = 0, idx = 1; i < def.length; i+=2, idx++) {
            graphics.setColor(Color.black);
            int width = ((Integer)def[i+1]).intValue();
            graphics.drawString("Q" + idx, x-5, y+10);
            graphics.drawString(width + "%", x + width+3, y + 10);
            graphics.setColor((Color)def[i]);
            graphics.fill(new Rectangle(x, y, width, 10));
            y += 15;
        }
        graphics.setColor(Color.black);
        graphics.setFont(new Font("Arial", Font.BOLD, 14));
        graphics.draw(group.getInteriorAnchor());
        graphics.drawString("Performance", x + 30, y + 10);

        FileOutputStream out = new FileOutputStream("hslf-graphics.ppt");
        ppt.write(out);
        out.close();
    } finally {
        ppt.close();
    }
}

Answer 2

下面是使用 Apache POI 5.2.5 创建折线图的代码片段（代码位于

Kotlin

，但可以使用 IDEA 或在线工具轻松移植到 Java）。 该函数返回

ByteArrayOutputStream

，因此调用函数可以保存文件（使用

FileOutputStream

）或直接响应 HTTP 请求（使用正确的响应标头）。

        fun getSlideWithLineChart(): ByteArrayOutputStream {
            val slideShow = XMLSlideShow()
            val slide = slideShow.createSlide()

            val categories = arrayOf("02/01/2023", "03/01/2023", "04/01/2023", "05/01/2023", "06/01/2023", "07/01/2023")
            val numOfPoints = categories.size

            val values = arrayOf(40.0, 55.0, 65.0, 75.0, 75.0, 30.0)

            val chart = slideShow.createChart()

            slide.addChart(
                chart,
                Rectangle2D.Double(
                    1.0 * Units.EMU_PER_CENTIMETER,
                    1.0 * Units.EMU_PER_CENTIMETER,
                    20.0 * Units.EMU_PER_CENTIMETER,
                    15.0 * Units.EMU_PER_CENTIMETER
                )
            )

            // data sources
            val categoryDataRange = chart.formatRange(CellRangeAddress(1, numOfPoints, 0, 0))
            val categoriesData: XDDFDataSource<String> =
                XDDFDataSourcesFactory.fromArray(categories, categoryDataRange, 0)

            val c = values.size + 1
            // data source
            val valueDataRange = chart.formatRange(CellRangeAddress(1, numOfPoints, c, c))
            val valueData = XDDFDataSourcesFactory.fromArray(values, valueDataRange, c)

            val bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM)
            val leftAxis = chart.createValueAxis(AxisPosition.LEFT)

            // set cross axis
            bottomAxis.crossAxis(leftAxis)
            leftAxis.crossAxis(bottomAxis)

            val data = chart.createData(ChartTypes.LINE, bottomAxis, leftAxis)
            data.setVaryColors(false)
            val series = data.addSeries(categoriesData, valueData)
            (series as XDDFLineChartData.Series).isSmooth = true
            series.setMarkerStyle(MarkerStyle.CIRCLE)

            // plot chart
            chart.plot(data)

            val byteArrayOS = ByteArrayOutputStream()
            slideShow.write(byteArrayOS)
            return byteArrayOS
        }

希望这有帮助。