こんにちは。
「AndroidでSVGを画像としてImageViewに表示する」と題した投稿で、Androidアプリ開発時にSVGファイルを画像として表示する、ということにトライしてみました。その際には、Android標準APIを利用する策と、サードパーティ製のライブラリを使う策の2つの方法を提示しました。
そこで今回は、その時にふと思いついたのが、”土俵をAndroidアプリではなく、普通にJavaでSVGファイルを画像ファイルに変換できないものだろうか?”という好奇心です。
今回用意したSVGファイル
Scalable Vector Graphicsは、画像をJPEGやPNGのようなビットマップデータではなく、ベクターデータの形式で表したものです。記法はXMLです。SVGの仕様はW3Cによって開発され、オープン標準として勧告されています。
実は私も詳しいことは分かっていません。『画像をXMLで表現したヤツ』という認識しかないです。
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横一直線に長いですね。これじゃよくわからないですね。ということで、こういう画像です。あ、元々はFASTICONから頂戴いたしました。
ファイル名からお察しいただけるかと思いますが、映画『バック・トゥ・ザ・フューチャー』シリーズに登場する車型タイムマシンです。カッコいい。
上記のSVGが長いのでわかりにくいと思いますが、縦横が512pxで設定されているので、この画像も512pxです。
style="enable-background:new 0 0 512 512;" version="1.1" viewBox="0 0 512 512" width="512px" height="512px"
このSVGファイルをPNGファイルに変換するプログラムを書きたいと思います。というか、この画像が、そのプログラムで生成したPNGファイルです。
利用するライブラリ
すべてApacheが提供してくれているライブラリです。
3つ掲載しましたが、BatikがXML GraphicsとXML Externalを依存しています。
ということで、つまりは、以下のJARファイルを入手しました。
- batik-all-1.9.jar
- xml-apis-ext.jar
- xml-apis.jar
- xmlgraphics-commons-2.2.jar
BatikはJava 1.6以上が必須です(私はJava 1.8で試しました)。
対応しているSVGの仕様はバージョン1.1までのようです。1.2 Specificationには未対応のままのようです。
この投稿を書いているのは2017年6月末なのですが、上記の各Webサイトを見ると、”Web2.0以前のホームページっぽさ”を感じてしまうのは私だけでしょうか?日本アカデミー賞優秀主演男優賞を受賞したこともある俳優の阿部 寛さんのホームページにも似た雰囲気を感じてしまいます。
ということで、いつ、これらのライブラリがEOLになるか、わかったもんじゃありません。
いざ、プログラム
上記のBatikのWebサイトでサンプルコードは掲載されてあれども、うまくいきませんでした。困りました。
そこでインターネットという大海に飛び込んでみると、こちらのブログを発見しました。
霧笛望のもったいない開発保管庫 Apache batikによるSVG→PNG/JPEGへの変換方法
2009-06-18の記事となっています。8年前のブログが残っていた(残していただいていた)奇跡に感謝します。kirifue様、ありがとうございます。
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();
// widthとheight、そしてリージョンを設定
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);
// 変換
pngTranscoder.transcode(input, output);
} catch (Exception e) {
e.printStackTrace();
} finally {
System.out.println("完了");
}
}
}
svgと名付けたフォルダにSVGファイルを保存しておきます。imgという名のフォルダを作っておきます。実行しますと、PNG画像ファイルが出力されます。
以上です。