是否可以用 Jasper 制作圆形图像边框？

Question

可以用碧玉应用圆形图像的效果吗？

我进行了很多搜索，但在任何地方都找不到如何简单地将边框半径添加到 Jasper Report 中的图像。

Answer 1

AFIK Jasper Report (jrxml) 中没有允许您直接向图像添加圆角边框的设置，但是

您可以添加一个 java class 来详细说明图像，然后再将其添加到报告中

例如，我将从这个答案中添加Philipp Reichart的方法到我称为 ImageUtil 的ImageUtil

 package it.jdd; import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; public class ImageUtil { private ImageUtil() { super(); } public static BufferedImage makeRoundedCorner(BufferedImage image, int cornerRadius) { int w = image.getWidth(); int h = image.getHeight(); BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); Graphics2D g2 = output.createGraphics(); // This is what we want, but it only does hard-clipping, ie aliasing // g2.setClip(new RoundRectangle2D...) // so instead fake soft-clipping by first drawing the desired clip shape // in fully opaque white with antialiasing enabled... g2.setComposite(AlphaComposite.Src); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setColor(Color.WHITE); g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius, cornerRadius)); //... then compositing the image on top, // using the white shape from above as alpha source g2.setComposite(AlphaComposite.SrcIn); g2.drawImage(image, 0, 0, null); g2.dispose(); return output; } }

^{引用整个类的可读性，因为该方法取自 Philipp's great answer}

有了这个 class 在类路径中，您现在可以将圆形边框应用于您的图像

jrxml 示例

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="ImageRounded" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="ea1bfa6c-be34-45af-b1cf-1bf35e3f359c">
    <queryString>
        <![CDATA[]]>
    </queryString>
    <title>
        <band height="200" splitType="Stretch">
            <image>
                <reportElement x="20" y="20" width="200" height="153" uuid="ae9f7e0a-84cb-4e3e-8183-5bd00017a4f0"/>
                <imageExpression><![CDATA[it.jdd.ImageUtil.makeRoundedCorner(javax.imageio.ImageIO.read(new java.io.File("C:/testImage.png")),50)]]></imageExpression>
            </image>
        </band>
    </title>
</jasperReport>

Output