Java2Dで縁取り文字列を描画する例

Java2DSample.java

package aoetk.java2dsample;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.TextAttribute;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
import java.util.Objects;

public class Java2DSample {

    public static void main(String[] args) throws Exception {
        if (args.length == 0) {
            System.out.println("specify output path");
            System.exit(1);
        }
        var outputPath = Path.of(args[0]);
        Files.createDirectories(outputPath);

        var image = ImageIO.read(Objects.requireNonNull(Java2DSample.class.getResourceAsStream("/java2dtest.png")));
        var graphics = (Graphics2D) image.getGraphics();

        var font = new Font(Map.of(
                TextAttribute.FAMILY, Font.SANS_SERIF,
                TextAttribute.SIZE, 80,
                TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD));
        var glyphVector = font.createGlyphVector(graphics.getFontRenderContext(), "Outlined Text");
        var outlineShape = glyphVector.getOutline(120.0f, 980.0f);

        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        graphics.setStroke(new BasicStroke(10.0f));
        graphics.setColor(Color.BLACK);
        graphics.draw(outlineShape);
        graphics.setColor(Color.WHITE);
        graphics.fill(outlineShape);

        var outputFile = outputPath.resolve("output.png");
        ImageIO.write(image, "png", outputFile.toFile());
    }

}