JDrawing.java

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Path2D;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.stream.Collectors;

/**
 * Draw simple single-colored absolute SVG path without transformation using Java.
 * 
 * @author Yuuta
 */
public class JDrawing {
    public static void main(String... args) throws Throwable {
        final JFrame window = new JFrame();
        window.setTitle(args[0]);
        window.add(new DrawingPanel(g -> {
            draw(args[0], g);
        }));
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setVisible(true);
    }

    private static void draw(String file, Graphics g) {
        final Path2D path2D = new Path2D.Double();

        try {
            try(BufferedReader reader = new BufferedReader(new FileReader(file))) {
                while(true) {
                    final String line = reader.readLine();
                    if(line == null) break;
                    final Double[] args = line.length() > 2 ? Arrays.stream(line.substring(2).split(","))
                            .map(Double::parseDouble)
                            .collect(Collectors.toList())
                            .toArray(new Double[]{}) : new Double[]{};
                    switch (line.charAt(0)) {
                        case 'M':
                            path2D.moveTo(args[0], args[1]);
                            break;
                        case 'C':
                            path2D.curveTo(args[0], args[1],
                                    args[2], args[3],
                                    args[4], args[5]);
                            break;
                        case 'L':
                            path2D.lineTo(args[0], args[1]);
                            break;
                        case 'H':
                            path2D.lineTo(args[0], path2D.getCurrentPoint().getY());
                            break;
                        case 'V':
                            path2D.lineTo(path2D.getCurrentPoint().getX(), args[0]);
                            break;
                        case 'Z':
                            path2D.closePath();
                            break;
                        default:
                            throw new UnsupportedOperationException(
                                    String.format("Unsupported command %s.\n", line.charAt(0)));
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        g.setColor(Color.BLACK);
        ((Graphics2D)g).fill(path2D);
    }

    private static class DrawingPanel extends JPanel {
        private final OnDrawCallback callback;

        public DrawingPanel(OnDrawCallback callback) {
            this.callback = callback;
        }

        @Override
        public void paint(Graphics g) {
            super.paint(g);
            callback.onDraw(g);
        }

        @FunctionalInterface
        public interface OnDrawCallback {
            void onDraw(Graphics g);
        }
    }
}

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Z