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
以上就是Java 在PDF中绘制形状的两种方法的详细内容，更多关于Java 在PDF中绘制形状的资料请关注脚本之家其它相关文章！
