Hello. In the post entitled "Display SVG as an image on Android", it was decided to display the SVG file as an image when developing an Android application. I tried it. At that time, I presented two methods, one is to use the Android standard API and the other is to use a third-party library.

So, this time, I suddenly came up with the curiosity of "Isn't it possible to convert SVG files to image files with Java instead of Android apps?"

SVG file prepared this time

Scalable Vector Graphics is a representation of an image in the form of vector data rather than bitmap data such as JPEG or PNG. The notation is XML. The SVG specification was developed by the W3C and is recommended as an open standard. Actually, I don't know the details either. There is only recognition that "the guy who expressed the image in XML".

`delorean.svg`


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It's long in a horizontal straight line. I'm not sure about this. So, this is the image. Ah, it was originally received from FASTICON.

As you can guess from the file name, it is a car-shaped time machine that appears in the movie "Back to the Future" series. cool.

I think it is difficult to understand because the above SVG is long, but since the height and width are set to 512px, this image is also 512px.

`Excerpt only where the vertical and horizontal pixel sizes are specified`


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

I would like to write a program to convert this SVG file to a PNG file. Rather, this image is the PNG file generated by the program.

Library to use

The Apache™ Batik Project
- The Apache™ XML Graphics Project -External Components of The Apache ™ XML Commons project

All are libraries provided by Apache. I've posted three, but Batik depends on XML Graphics and XML External.

So, in other words, I got the following JAR file.

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

Batik requires Java 1.6 or higher (I tried with Java 1.8). The supported SVG specifications seem to be up to version 1.1. It seems that 1.2 Specification is not supported. I wrote this post at the end of June 2017, but when I look at each of the above websites, am I the only one who feels "like a homepage before Web 2.0"? I feel a similar atmosphere to the actor Hiroshi Abe's homepage, who has won the Japan Academy Award for Outstanding Leading Actor. So I don't know when these libraries will be EOL.

Now, the program

The sample code was posted on the Batik website above, but it didn't work. I am troubled.

So when I jumped into the ocean called the Internet, I found this blog.

How to convert SVG to PNG / JPEG by Apache batik

It is an article of 2009-06-18. Thank you for the miracle that the blog of 8 years ago was left (remained). Thank you, 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();

      //Set width, height, and region
      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("Done");
    }
  }
}

Save the SVG file in a folder named svg. Create a folder named img. When executed, a PNG image file will be output.

that's all.

Convert SVG files to PNG files in Java

SVG file prepared this time

delorean.svg

Excerpt only where the vertical and horizontal pixel sizes are specified

Library to use

Now, the program

ConvSVG4PNG.java

`delorean.svg`

`Excerpt only where the vertical and horizontal pixel sizes are specified`

`ConvSVG4PNG.java`