test/jdk/java/awt/font/GlyphVector/TestOutline.java

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.font.GlyphVector;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JPanel;

/*
 * @test
 * @bug 4255072
 * @summary Display the outline of a GlyphVector that has overlapping 'O' characters in it.
 *          The places where the strokes of the characters cross should be filled in.
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual TestOutline
 */

public final class TestOutline extends JPanel {
    Shape outline;

    public static void main(String[] args) throws Exception {
        final String INSTRUCTIONS = """
                Two overlapping 'O' characters should appear. Pass the test if
                the places where the strokes of the characters cross is filled in.
                Fail it if these places are not filled in.""";

        PassFailJFrame.builder()
                .title("TestOutline Instruction")
                .instructions(INSTRUCTIONS)
                .columns(35)
                .splitUI(TestOutline::new)
                .build()
                .awaitAndCheck();
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(200, 250);
    }

    @Override
    public void paint(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0, 0, getWidth(), getHeight());

        if (outline == null) {
            outline = createLayout(g2d);
        }

        g2d.setColor(Color.BLACK);
        g2d.fill(outline);
    }

    private Shape createLayout(Graphics2D g2d) {
        Font font = new Font(Font.DIALOG, Font.PLAIN, 144);
        GlyphVector gv = font.createGlyphVector(g2d.getFontRenderContext(), "OO");
        gv.performDefaultLayout();
        Point2D pt = gv.getGlyphPosition(1);
        double delta = -pt.getX() / 2.0;
        pt.setLocation(pt.getX() + delta, pt.getY());
        gv.setGlyphPosition(1, pt);

        pt = gv.getGlyphPosition(2);
        pt.setLocation(pt.getX() + delta, pt.getY());
        gv.setGlyphPosition(2, pt);

        Rectangle2D bounds = gv.getLogicalBounds();
        Rectangle d = getBounds();
        float x = (float) ((d.width - bounds.getWidth()) / 2 + bounds.getX());
        float y = (float) ((d.height - bounds.getHeight()) / 2 - bounds.getY());
        System.out.println("loc: " + x + ", " + y);
        return gv.getOutline(x, y);
    }
}