Konvertieren Sie SVG-Dateien in Java in PNG-Dateien
Hallo. In dem Beitrag mit dem Titel "SVG als Bild auf Android anzeigen" wurde beschlossen, die SVG-Datei bei der Entwicklung einer Android-Anwendung als Bild anzuzeigen. Ich versuchte es. Zu dieser Zeit habe ich zwei Methoden vorgestellt: Die Verwendung der Android-Standard-API und die Verwendung einer Bibliothek eines Drittanbieters.
Dieses Mal kam mir plötzlich die Neugier: "Ist es nicht möglich, SVG-Dateien mit Java in Bilddateien zu konvertieren, anstatt Android-Apps zu verwenden?"
Diesmal wurde die SVG-Datei vorbereitet
Skalierbare Vektorgrafiken sind eine Darstellung eines Bildes in Form von Vektordaten anstelle von Bitmap-Daten wie JPEG oder PNG. Die Notation ist XML. Die SVG-Spezifikation wurde von W3C entwickelt und wird als offener Standard empfohlen. Eigentlich kenne ich die Details auch nicht. Es gibt nur die Erkenntnis, dass "der Typ, der das Bild in XML ausgedrückt hat".
delorean.svg
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Es ist lang in einer horizontalen geraden Linie. Ich bin mir darüber nicht sicher. Das ist also das Bild. Ah, es wurde ursprünglich von FASTICON erhalten.
Wie Sie dem Dateinamen entnehmen können, handelt es sich um eine autoförmige Zeitmaschine, die in der Filmreihe "Zurück in die Zukunft" erscheint. cool.
Ich denke, es ist schwer zu verstehen, weil das obige SVG lang ist, aber da die Höhe und Breite auf 512 Pixel eingestellt sind, ist dieses Bild auch 512 Pixel groß.
Auszug nur dort, wo die vertikalen und horizontalen Pixelgrößen angegeben sind
style="enable-background:new 0 0 512 512;" version="1.1" viewBox="0 0 512 512" width="512px" height="512px"
Ich möchte ein Programm schreiben, um diese SVG-Datei in eine PNG-Datei zu konvertieren. Dieses Bild ist vielmehr die von diesem Programm erzeugte PNG-Datei.
Bibliothek zu verwenden
Alle sind von Apache bereitgestellte Bibliotheken. Ich habe drei gepostet, aber Batik hängt von XML Graphics und XML External ab.
Mit anderen Worten, ich habe die folgende JAR-Datei erhalten.
- batik-all-1.9.jar
- xml-apis-ext.jar
- xml-apis.jar
- xmlgraphics-commons-2.2.jar
Batik benötigt Java 1.6 oder höher (ich habe es mit Java 1.8 versucht). Die unterstützten SVG-Spezifikationen scheinen Version 1.1 zu entsprechen. Es scheint, dass die 1.2-Spezifikation nicht unterstützt wird. Ich habe diesen Beitrag Ende Juni 2017 geschrieben, aber wenn ich mir jede der oben genannten Websites anschaue, bin ich der einzige, der sich "wie eine Homepage vor Web2.0" fühlt? Ich empfinde eine ähnliche Atmosphäre wie der Schauspieler Hiroshi Abes Homepage, der den Japan Academy Award für herausragenden Hauptdarsteller gewonnen hat. Ich weiß also nicht, wann diese Bibliotheken EOL sein werden.
Nun das Programm
Der Beispielcode wurde oben auf der Batik-Website veröffentlicht, hat aber nicht funktioniert. Ich bin beunruhigt.
Als ich in den Ozean namens Internet sprang, fand ich diesen Blog.
So konvertieren Sie SVG von Apache batik in PNG / JPEG
Es ist ein Artikel vom 18.06.2009. Vielen Dank für das Wunder, dass der Blog von vor 8 Jahren verlassen wurde (geblieben ist). Danke, 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();
//Stellen Sie Breite, Höhe und Region ein
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);
//Umwandlung
pngTranscoder.transcode(input, output);
} catch (Exception e) {
e.printStackTrace();
} finally {
System.out.println("Erledigt");
}
}
}
Speichern Sie die SVG-Datei in einem Ordner namens svg. Erstellen Sie einen Ordner mit dem Namen img. Bei der Ausführung wird eine PNG-Bilddatei ausgegeben.
das ist alles.
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