Convertir des fichiers SVG en fichiers PNG en Java

Bonjour. Dans le post intitulé "Afficher SVG sous forme d'image sur Android", il a été décidé d'afficher le fichier SVG sous forme d'image lors du développement d'une application Android. Je l'ai essayé. À ce moment-là, j'ai présenté deux méthodes, l'une consiste à utiliser l'API standard Android et l'autre à utiliser une bibliothèque tierce.

Donc, cette fois, j'ai soudainement eu la curiosité de "N'est-il pas possible de convertir des fichiers SVG en fichiers image avec Java au lieu d'utiliser des applications Android?"

Fichier SVG préparé cette fois

Les graphiques vectoriels évolutifs sont une représentation d'une image sous la forme de données vectorielles plutôt que de données bitmap telles que JPEG ou PNG. La notation est XML. La spécification SVG a été développée par le W3C et est recommandée en tant que norme ouverte. En fait, je ne connais pas non plus les détails. Il n'y a que la reconnaissance que "le gars qui a exprimé l'image en XML".

delorean.svg

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C'est long en ligne droite horizontale. Je ne suis pas sûr de cela. Alors, c'est l'image. Ah, il a été initialement reçu de FASTICON.

Comme vous pouvez le deviner d'après le nom du fichier, il s'agit d'une machine à remonter le temps en forme de voiture qui apparaît dans la série de films "Retour vers le futur". cool.

Je pense que c'est difficile à comprendre car le SVG ci-dessus est long, mais comme la hauteur et la largeur sont réglées sur 512px, cette image fait également 512px.

Extrait uniquement lorsque les tailles de pixels verticales et horizontales sont spécifiées

style="enable-background:new 0 0 512 512;" version="1.1" viewBox="0 0 512 512" width="512px" height="512px"

Je voudrais écrire un programme pour convertir ce fichier SVG en fichier PNG. Cette image est plutôt le fichier PNG généré par ce programme.

Bibliothèque à utiliser

• The Apache™ Batik Project
  • The Apache™ XML Graphics Project
• Composants externes du projet Apache ™ XML Commons

Toutes sont des bibliothèques fournies par Apache. J'en ai publié trois, mais Batik dépend de XML Graphics et XML External.

Donc, en d'autres termes, j'ai obtenu le fichier JAR suivant.

• batik-all-1.9.jar
• xml-apis-ext.jar
• xml-apis.jar
• xmlgraphics-commons-2.2.jar

Batik nécessite Java 1.6 ou supérieur (j'ai essayé avec Java 1.8). Les spécifications SVG prises en charge semblent être jusqu'à la version 1.1. Il semble que la spécification 1.2 n'est pas prise en charge. J'ai écrit ce post à la fin du mois de juin 2017, mais quand je regarde chacun des sites Web ci-dessus, suis-je le seul à me sentir "comme une page d'accueil avant Web2.0"? Je ressens une atmosphère similaire à celle de l'acteur page d'accueil d'Hiroshi Abe, qui a remporté le Japan Academy Award for Outstanding Leading Actor. Donc je ne sais pas quand ces bibliothèques seront EOL.

Maintenant, le programme

L'exemple de code a été publié sur le site Web Batik ci-dessus, mais cela n'a pas fonctionné. Je suis troublé.

Alors, quand j'ai sauté dans l'océan appelé Internet, j'ai trouvé ce blog.

Comment convertir SVG en PNG / JPEG par Apache batik

C'est un article du 2009-06-18. Merci pour le miracle que le blog d'il y a 8 ans a été laissé (resté). Merci, Kirifue.

ConvSVG4PNG.java

package edu.study;

import java.awt.Rectangle;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;

public class ConvSVG4PNG {
  public static void main(String[] args) {

    try (InputStream istream = new FileInputStream("svg/delorean.svg");
        OutputStream ostream = new FileOutputStream("img/delorean.png ");) {

      TranscoderInput input = new TranscoderInput(istream);

      TranscoderOutput output = new TranscoderOutput(ostream);

      PNGTranscoder pngTranscoder = new PNGTranscoder();

      //Définir la largeur, la hauteur et la région
      int width = 512;
      int height = 512;
      Rectangle rect = new Rectangle(0, 0, width, height);
      pngTranscoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, new Float(rect.width));
      pngTranscoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, new Float(rect.height));
      pngTranscoder.addTranscodingHint(PNGTranscoder.KEY_AOI, rect);

      //conversion
      pngTranscoder.transcode(input, output);

    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      System.out.println("Terminé");
    }
  }
}

Enregistrez le fichier SVG dans un dossier nommé svg. Créez un dossier nommé img. Une fois exécuté, un fichier image PNG sera généré.

c'est tout.