在我们编辑PDF文档的过程中，有时候需要在文档中添加一些如多边形、矩形、椭圆形之类的图形，而Free Spire PDF for Java 则正好可以帮助我们在Java程序中通过代码在PDF文档中绘制形状，以及设置形状边线颜色和填充色。

Jar包导入

方法一：下载Free Spire.PDF for Java包并解压缩，然后将lib文件夹下的Spire.Pdf.jar包作为依赖项导入到Java应用程序中

方法二：直接通过Maven仓库安装JAR包，配置pom.xml文件的代码如下：

<repositories> <repository> <id>com.e-iceblue</id> <url>http://repo.e-iceblue.cn/repository/maven-public/</url> </repository></repositories><dependencies> <dependency> <groupId>e-iceblue</groupId> <artifactId>spire.pdf.free</artifactId> <version>2.6.3</version> </dependency></dependencies>

Java代码

import com.spire.pdf.*;import com.spire.pdf.graphics.*;import java.awt.*;import java.awt.geom.Rectangle2D;public class DrawShapes { public static void main(String[]args){ //创建PDF文档，并添加一页 PdfDocument pdf = new PdfDocument(); PdfPageBase page = pdf.appendPage(); //创建画笔、画刷 PdfPen pen =new PdfPen(new PdfRGBColor(Color.black),0.3); PdfBrush brush= PdfBrushes.getGreenYellow(); //绘制矩形 Rectangle2D.Float rect1 = new Rectangle2D.Float(0, 20, 120, 50);//创建Rectangle2D对象，并指定图形在PDF页面中的大小、位置 PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(rect1,new PdfRGBColor(Color.pink),new PdfRGBColor(Color.YELLOW),PdfLinearGradientMode.Horizontal);//填充图形颜色 page.getCanvas().drawRectangle(linearGradientBrush, rect1);//绘制矩形到页面 //绘制椭圆 Point centerStart= new Point(205,45); Point centerEnd= new Point(205,45); PdfRadialGradientBrush radialGradientBrush = new PdfRadialGradientBrush(centerStart,0,centerEnd,60,new PdfRGBColor(Color.white),new PdfRGBColor(Color.cyan)); Rectangle2D.Float rect2= new Rectangle2D.Float(180, 20, 50, 50); page.getCanvas().drawEllipse(radialGradientBrush,rect2); //绘制多边形 Point p1=new Point(290,70); Point p2=new Point(310,45); Point p3=new Point(325,60); Point p4=new Point(340,20); Point p5=new Point(370,70); Point[] points = {p1, p2, p3, p4, p5}; page.getCanvas().drawPolygon(pen,brush, points); //绘制弧形 float startAngle = 0; float sweepAngle = 270; Rectangle2D.Float rect3= new Rectangle2D.Float(0, 110, 50, 50); page.getCanvas().drawArc(pen, rect3, startAngle, sweepAngle); //绘制扇形 Rectangle2D.Float rect4= new Rectangle2D.Float(70, 110, 50, 50); page.getCanvas().drawPie(pen, rect4, startAngle, sweepAngle); //绘制两条垂直交叉的直线 Point pStart1=new Point(205,110); Point pEnd1=new Point(205,160); page.getCanvas().drawLine(pen, pStart1, pEnd1); Point pStart2=new Point(180,135); Point pEnd2=new Point(230,135); page.getCanvas().drawLine(pen, pStart2, pEnd2); //绘制贝塞尔曲线 Point startPoint = new Point(290, 135); Point firstControlPoint = new Point(330, 70); Point secondControlPoint = new Point(330, 200); Point endPoint = new Point(370, 135); page.getCanvas().drawBezier(pen, startPoint, firstControlPoint, secondControlPoint, endPoint); //保存文档 pdf.saveToFile("DrawShapes.pdf",FileFormat.PDF); }}

效果图

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