图表,是指将既得数据用图形的方式表示出来。在前文中我们介绍过如何使用Java程序来为Excel文档创建图表的方法。本文将通过使用Java程序来演示如何创建PowerPoint图表及为图表添加趋势线。趋势线的运用能够显示数据的变化趋势,同时能够帮助预测数据的未来值。
Jar文件获取及导入:
方法1:通过官网下载获取jar包。解压后将lib文件夹下的Spire.Presentation.jar文件导入Java程序。(如下图)
方法2:通过maven仓库安装导入。具体安装教程参见此网页。
【示例1】创建图表
import com.spire.presentation.*;
import com.spire.pdf.tables.table.*;
import com.spire.presentation.charts.*;
import com.spire.presentation.drawing.FillFormatType;
import java.awt.geom.Rectangle2D;
import java.lang.Object;
public class AddChart {
public static void main(String[] args) throws Exception {
//实例化一个Presentation对象
Presentation presentation = new Presentation();
//插入柱形图
Rectangle2D.Double rect = new Rectangle2D.Double(40, 100, 550, 320);
IChart chart = null;
chart = presentation.getSlides().get(0).getShapes().appendChart(ChartType.COLUMN_CLUSTERED, rect);
//添加表名
chart.getChartTitle().getTextProperties().setText("销售报表");
chart.getChartTitle().getTextProperties().isCentered(true);
chart.getChartTitle().setHeight(30);
chart.hasTitle(true);
//创建后台数据表
DataTable dataTable = new DataTable();
dataTable.getColumns().add(new DataColumn("销售额", DataTypes.DATATABLE_STRING));
dataTable.getColumns().add(new DataColumn("谷物", DataTypes.DATATABLE_INT));
dataTable.getColumns().add(new DataColumn("粮油", DataTypes.DATATABLE_INT));
dataTable.getColumns().add(new DataColumn("百货", DataTypes.DATATABLE_INT));
DataRow row1 = dataTable.newRow();
row1.setString("销售额", "门店1");
row1.setInt("谷物", 250);
row1.setInt("粮油", 150);
row1.setInt("百货", 99);
DataRow row2 = dataTable.newRow();
row2.setString("销售额", "门店2");
row2.setInt("谷物", 270);
row2.setInt("粮油", 150);
row2.setInt("百货", 99);
DataRow row3 = dataTable.newRow();
row3.setString("销售额", "门店3");
row3.setInt("谷物", 310);
row3.setInt("粮油", 120);
row3.setInt("百货", 49);
DataRow row4 = dataTable.newRow();
row4.setString("销售额", "门店4");
row4.setInt("谷物", 330);
row4.setInt("粮油", 120);
row4.setInt("百货", 49);
DataRow row5 = dataTable.newRow();
row5.setString("销售额", "门店5");
row5.setInt("谷物", 360);
row5.setInt("粮油", 150);
row5.setInt("百货", 141);
DataRow row6 = dataTable.newRow();
row6.setString("销售额", "门店6");
row6.setInt("谷物", 380);
row6.setInt("粮油", 150);
row6.setInt("百货", 135);
dataTable.getRows().add(row1);
dataTable.getRows().add(row2);
dataTable.getRows().add(row3);
dataTable.getRows().add(row4);
dataTable.getRows().add(row5);
dataTable.getRows().add(row6);
//将数据写入图表
for (int c = 0; c < dataTable.getColumns().size(); c++) {
chart.getChartData().get(0, c).setText(dataTable.getColumns().get(c).getColumnName());
}
for (int r = 0; r < dataTable.getRows().size(); r++) {
Object[] datas = dataTable.getRows().get(r).getArrayList();
for (int c = 0; c < datas.length; c++) {
chart.getChartData().get(r + 1, c).setValue(datas[c]);
}
}
//设置系列标签
chart.getSeries().setSeriesLabel(chart.getChartData().get("B1", "D1"));
//设置类别标签
chart.getCategories().setCategoryLabels(chart.getChartData().get("A2", "A7"));
//为各个系列赋值
chart.getSeries().get(0).setValues(chart.getChartData().get("B2", "B7"));
chart.getSeries().get(1).setValues(chart.getChartData().get("C2", "C7"));
chart.getSeries().get(2).setValues(chart.getChartData().get("D2", "D7"));
chart.getSeries().get(2).getFill().setFillType(FillFormatType.SOLID);
chart.getSeries().get(2).getFill().getSolidColor().setKnownColor(KnownColors.LIGHT_BLUE);
//设置系列重叠
chart.setOverLap(-50);
//设置类别间距
chart.setGapDepth(200);
//保存文档
presentation.saveToFile("output/CreateChart.pptx", FileFormat.PPTX_2010);
}
}
创建效果:
【示例2】为图表添加趋势线
import com.spire.presentation.FileFormat;
import com.spire.presentation.ISlide;
import com.spire.presentation.Presentation;
import com.spire.presentation.charts.IChart;
import com.spire.presentation.charts.ITrendlines;
import com.spire.presentation.charts.TrendlineSimpleType;
public class AddTrendline {
public static void main(String[] args) throws Exception {
//创建Presentation实例
Presentation ppt = new Presentation();
//加载PowerPoint文档
ppt.loadFromFile("C:\\Users\\Test1\\Desktop\\CreateChart.pptx");
//获取第一张幻灯片
ISlide slide = ppt.getSlides().get(0);
//获取幻灯片上的图表
IChart chart = (IChart)slide.getShapes().get(0);
//给图表的第一个数据系列添加线性趋势线
ITrendlines trendLine = chart.getSeries().get(0).addTrendLine(TrendlineSimpleType.LINEAR);
//不显示公式
//trendLine.setdisplayEquation(false);
//不显示R平方值
//trendLine.setdisplayRSquaredValue(false);
//保存结果文档
ppt.saveToFile("output/AddTrendline.pptx", FileFormat.PPTX_2013);
}
}
添加效果:
(本文完)